X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d1ecb069dfe24481e4a83f44cb5217a2b06746d7..a991bd8d3e7fe02dbca0644054bab73c5b75324a:/osfmk/vm/vm_pageout.c diff --git a/osfmk/vm/vm_pageout.c b/osfmk/vm/vm_pageout.c index 6dae066d4..63dd004ea 100644 --- a/osfmk/vm/vm_pageout.c +++ b/osfmk/vm/vm_pageout.c @@ -1,8 +1,8 @@ /* - * Copyright (c) 2000-2009 Apple Inc. All rights reserved. + * Copyright (c) 2000-2020 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ - * + * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in @@ -11,10 +11,10 @@ * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. - * + * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. - * + * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, @@ -22,34 +22,34 @@ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. - * + * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ -/* +/* * Mach Operating System * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University * All Rights Reserved. - * + * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. - * + * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * + * * Carnegie Mellon requests users of this software to return to - * + * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 - * + * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ @@ -64,12 +64,11 @@ */ #include +#include #include #include #include -#include -#include #include #include @@ -89,17 +88,16 @@ #include #include #include -#include #include +#include +#include +#include #include #include -#if CONFIG_EMBEDDED -#include -#endif - #include +#include #include #include #include @@ -108,23 +106,52 @@ #include /* must be last */ #include #include +#include +#include -/* - * ENCRYPTED SWAP: - */ -#include <../bsd/crypto/aes/aes.h> -extern u_int32_t random(void); /* from */ +#include + +#if CONFIG_PHANTOM_CACHE +#include +#endif #if UPL_DEBUG #include #endif -#ifndef VM_PAGEOUT_BURST_ACTIVE_THROTTLE /* maximum iterations of the active queue to move pages to inactive */ -#define VM_PAGEOUT_BURST_ACTIVE_THROTTLE 100 -#endif +extern int cs_debug; + +extern void mbuf_drain(boolean_t); + +#if VM_PRESSURE_EVENTS +#if CONFIG_JETSAM +extern unsigned int memorystatus_available_pages; +extern unsigned int memorystatus_available_pages_pressure; +extern unsigned int memorystatus_available_pages_critical; +#else /* CONFIG_JETSAM */ +extern uint64_t memorystatus_available_pages; +extern uint64_t memorystatus_available_pages_pressure; +extern uint64_t memorystatus_available_pages_critical; +#endif /* CONFIG_JETSAM */ + +extern unsigned int memorystatus_frozen_count; +extern unsigned int memorystatus_suspended_count; +extern vm_pressure_level_t memorystatus_vm_pressure_level; + +extern lck_mtx_t memorystatus_jetsam_fg_band_lock; +extern uint32_t memorystatus_jetsam_fg_band_waiters; + +void vm_pressure_response(void); +extern void consider_vm_pressure_events(void); + +#define MEMORYSTATUS_SUSPENDED_THRESHOLD 4 +#endif /* VM_PRESSURE_EVENTS */ + +thread_t vm_pageout_scan_thread = THREAD_NULL; +boolean_t vps_dynamic_priority_enabled = FALSE; #ifndef VM_PAGEOUT_BURST_INACTIVE_THROTTLE /* maximum iterations of the inactive queue w/o stealing/cleaning a page */ -#ifdef CONFIG_EMBEDDED +#ifdef CONFIG_EMBEDDED #define VM_PAGEOUT_BURST_INACTIVE_THROTTLE 1024 #else #define VM_PAGEOUT_BURST_INACTIVE_THROTTLE 4096 @@ -132,41 +159,38 @@ extern u_int32_t random(void); /* from */ #endif #ifndef VM_PAGEOUT_DEADLOCK_RELIEF -#define VM_PAGEOUT_DEADLOCK_RELIEF 100 /* number of pages to move to break deadlock */ +#define VM_PAGEOUT_DEADLOCK_RELIEF 100 /* number of pages to move to break deadlock */ #endif -#ifndef VM_PAGEOUT_INACTIVE_RELIEF -#define VM_PAGEOUT_INACTIVE_RELIEF 50 /* minimum number of pages to move to the inactive q */ -#endif +#ifndef VM_PAGE_LAUNDRY_MAX +#define VM_PAGE_LAUNDRY_MAX 128UL /* maximum pageouts on a given pageout queue */ +#endif /* VM_PAGEOUT_LAUNDRY_MAX */ -#ifndef VM_PAGE_LAUNDRY_MAX -#define VM_PAGE_LAUNDRY_MAX 16UL /* maximum pageouts on a given pageout queue */ -#endif /* VM_PAGEOUT_LAUNDRY_MAX */ +#ifndef VM_PAGEOUT_BURST_WAIT +#define VM_PAGEOUT_BURST_WAIT 1 /* milliseconds */ +#endif /* VM_PAGEOUT_BURST_WAIT */ -#ifndef VM_PAGEOUT_BURST_WAIT -#define VM_PAGEOUT_BURST_WAIT 30 /* milliseconds per page */ -#endif /* VM_PAGEOUT_BURST_WAIT */ +#ifndef VM_PAGEOUT_EMPTY_WAIT +#define VM_PAGEOUT_EMPTY_WAIT 50 /* milliseconds */ +#endif /* VM_PAGEOUT_EMPTY_WAIT */ -#ifndef VM_PAGEOUT_EMPTY_WAIT -#define VM_PAGEOUT_EMPTY_WAIT 200 /* milliseconds */ -#endif /* VM_PAGEOUT_EMPTY_WAIT */ +#ifndef VM_PAGEOUT_DEADLOCK_WAIT +#define VM_PAGEOUT_DEADLOCK_WAIT 100 /* milliseconds */ +#endif /* VM_PAGEOUT_DEADLOCK_WAIT */ -#ifndef VM_PAGEOUT_DEADLOCK_WAIT -#define VM_PAGEOUT_DEADLOCK_WAIT 300 /* milliseconds */ -#endif /* VM_PAGEOUT_DEADLOCK_WAIT */ +#ifndef VM_PAGEOUT_IDLE_WAIT +#define VM_PAGEOUT_IDLE_WAIT 10 /* milliseconds */ +#endif /* VM_PAGEOUT_IDLE_WAIT */ + +#ifndef VM_PAGEOUT_SWAP_WAIT +#define VM_PAGEOUT_SWAP_WAIT 10 /* milliseconds */ +#endif /* VM_PAGEOUT_SWAP_WAIT */ -#ifndef VM_PAGEOUT_IDLE_WAIT -#define VM_PAGEOUT_IDLE_WAIT 10 /* milliseconds */ -#endif /* VM_PAGEOUT_IDLE_WAIT */ #ifndef VM_PAGE_SPECULATIVE_TARGET -#define VM_PAGE_SPECULATIVE_TARGET(total) ((total) * 1 / 20) +#define VM_PAGE_SPECULATIVE_TARGET(total) ((total) * 1 / (100 / vm_pageout_state.vm_page_speculative_percentage)) #endif /* VM_PAGE_SPECULATIVE_TARGET */ -#ifndef VM_PAGE_INACTIVE_HEALTHY_LIMIT -#define VM_PAGE_INACTIVE_HEALTHY_LIMIT(total) ((total) * 1 / 200) -#endif /* VM_PAGE_INACTIVE_HEALTHY_LIMIT */ - /* * To obtain a reasonable LRU approximation, the inactive queue @@ -180,39 +204,46 @@ extern u_int32_t random(void); /* from */ * then the pageout daemon starts running. */ -#ifndef VM_PAGE_INACTIVE_TARGET -#define VM_PAGE_INACTIVE_TARGET(avail) ((avail) * 1 / 3) -#endif /* VM_PAGE_INACTIVE_TARGET */ +#ifndef VM_PAGE_INACTIVE_TARGET +#define VM_PAGE_INACTIVE_TARGET(avail) ((avail) * 1 / 2) +#endif /* VM_PAGE_INACTIVE_TARGET */ /* * Once the pageout daemon starts running, it keeps going * until vm_page_free_count meets or exceeds vm_page_free_target. */ -#ifndef VM_PAGE_FREE_TARGET -#ifdef CONFIG_EMBEDDED -#define VM_PAGE_FREE_TARGET(free) (15 + (free) / 100) +#ifndef VM_PAGE_FREE_TARGET +#ifdef CONFIG_EMBEDDED +#define VM_PAGE_FREE_TARGET(free) (15 + (free) / 100) #else -#define VM_PAGE_FREE_TARGET(free) (15 + (free) / 80) +#define VM_PAGE_FREE_TARGET(free) (15 + (free) / 80) #endif -#endif /* VM_PAGE_FREE_TARGET */ +#endif /* VM_PAGE_FREE_TARGET */ + /* * The pageout daemon always starts running once vm_page_free_count * falls below vm_page_free_min. */ -#ifndef VM_PAGE_FREE_MIN -#ifdef CONFIG_EMBEDDED -#define VM_PAGE_FREE_MIN(free) (10 + (free) / 200) +#ifndef VM_PAGE_FREE_MIN +#ifdef CONFIG_EMBEDDED +#define VM_PAGE_FREE_MIN(free) (10 + (free) / 200) #else -#define VM_PAGE_FREE_MIN(free) (10 + (free) / 100) +#define VM_PAGE_FREE_MIN(free) (10 + (free) / 100) #endif -#endif /* VM_PAGE_FREE_MIN */ - -#define VM_PAGE_FREE_MIN_LIMIT 1500 -#define VM_PAGE_FREE_TARGET_LIMIT 2000 +#endif /* VM_PAGE_FREE_MIN */ +#ifdef CONFIG_EMBEDDED +#define VM_PAGE_FREE_RESERVED_LIMIT 100 +#define VM_PAGE_FREE_MIN_LIMIT 1500 +#define VM_PAGE_FREE_TARGET_LIMIT 2000 +#else +#define VM_PAGE_FREE_RESERVED_LIMIT 1700 +#define VM_PAGE_FREE_MIN_LIMIT 3500 +#define VM_PAGE_FREE_TARGET_LIMIT 4000 +#endif /* * When vm_page_free_count falls below vm_page_free_reserved, @@ -222,10 +253,10 @@ extern u_int32_t random(void); /* from */ * operation by dipping into the reserved pool of pages. */ -#ifndef VM_PAGE_FREE_RESERVED -#define VM_PAGE_FREE_RESERVED(n) \ +#ifndef VM_PAGE_FREE_RESERVED +#define VM_PAGE_FREE_RESERVED(n) \ ((unsigned) (6 * VM_PAGE_LAUNDRY_MAX) + (n)) -#endif /* VM_PAGE_FREE_RESERVED */ +#endif /* VM_PAGE_FREE_RESERVED */ /* * When we dequeue pages from the inactive list, they are @@ -236,211 +267,107 @@ extern u_int32_t random(void); /* from */ * we will make per call of vm_pageout_scan(). */ #define VM_PAGE_REACTIVATE_LIMIT_MAX 20000 -#ifndef VM_PAGE_REACTIVATE_LIMIT -#ifdef CONFIG_EMBEDDED -#define VM_PAGE_REACTIVATE_LIMIT(avail) (VM_PAGE_INACTIVE_TARGET(avail) / 2) + +#ifndef VM_PAGE_REACTIVATE_LIMIT +#ifdef CONFIG_EMBEDDED +#define VM_PAGE_REACTIVATE_LIMIT(avail) (VM_PAGE_INACTIVE_TARGET(avail) / 2) #else -#define VM_PAGE_REACTIVATE_LIMIT(avail) (MAX((avail) * 1 / 20,VM_PAGE_REACTIVATE_LIMIT_MAX)) +#define VM_PAGE_REACTIVATE_LIMIT(avail) (MAX((avail) * 1 / 20,VM_PAGE_REACTIVATE_LIMIT_MAX)) #endif -#endif /* VM_PAGE_REACTIVATE_LIMIT */ -#define VM_PAGEOUT_INACTIVE_FORCE_RECLAIM 100 +#endif /* VM_PAGE_REACTIVATE_LIMIT */ +#define VM_PAGEOUT_INACTIVE_FORCE_RECLAIM 1000 +extern boolean_t hibernate_cleaning_in_progress; /* - * must hold the page queues lock to - * manipulate this structure + * Forward declarations for internal routines. */ -struct vm_pageout_queue { - queue_head_t pgo_pending; /* laundry pages to be processed by pager's iothread */ - unsigned int pgo_laundry; /* current count of laundry pages on queue or in flight */ - unsigned int pgo_maxlaundry; - - unsigned int pgo_idle:1, /* iothread is blocked waiting for work to do */ - pgo_busy:1, /* iothread is currently processing request from pgo_pending */ - pgo_throttled:1,/* vm_pageout_scan thread needs a wakeup when pgo_laundry drops */ - :0; +struct cq { + struct vm_pageout_queue *q; + void *current_chead; + char *scratch_buf; + int id; }; -#define VM_PAGE_Q_THROTTLED(q) \ - ((q)->pgo_laundry >= (q)->pgo_maxlaundry) +struct cq ciq[MAX_COMPRESSOR_THREAD_COUNT]; -/* - * Exported variable used to broadcast the activation of the pageout scan - * Working Set uses this to throttle its use of pmap removes. In this - * way, code which runs within memory in an uncontested context does - * not keep encountering soft faults. - */ +#if VM_PRESSURE_EVENTS +void vm_pressure_thread(void); -unsigned int vm_pageout_scan_event_counter = 0; +boolean_t VM_PRESSURE_NORMAL_TO_WARNING(void); +boolean_t VM_PRESSURE_WARNING_TO_CRITICAL(void); -/* - * Forward declarations for internal routines. - */ +boolean_t VM_PRESSURE_WARNING_TO_NORMAL(void); +boolean_t VM_PRESSURE_CRITICAL_TO_WARNING(void); +#endif -static void vm_pageout_garbage_collect(int); -static void vm_pageout_iothread_continue(struct vm_pageout_queue *); +void vm_pageout_garbage_collect(int); static void vm_pageout_iothread_external(void); -static void vm_pageout_iothread_internal(void); +static void vm_pageout_iothread_internal(struct cq *cq); +static void vm_pageout_adjust_eq_iothrottle(struct vm_pageout_queue *, boolean_t); extern void vm_pageout_continue(void); extern void vm_pageout_scan(void); -static thread_t vm_pageout_external_iothread = THREAD_NULL; -static thread_t vm_pageout_internal_iothread = THREAD_NULL; +boolean_t vm_pageout_running = FALSE; -unsigned int vm_pageout_reserved_internal = 0; -unsigned int vm_pageout_reserved_really = 0; +uint32_t vm_page_upl_tainted = 0; +uint32_t vm_page_iopl_tainted = 0; -unsigned int vm_pageout_idle_wait = 0; /* milliseconds */ -unsigned int vm_pageout_empty_wait = 0; /* milliseconds */ -unsigned int vm_pageout_burst_wait = 0; /* milliseconds */ -unsigned int vm_pageout_deadlock_wait = 0; /* milliseconds */ -unsigned int vm_pageout_deadlock_relief = 0; -unsigned int vm_pageout_inactive_relief = 0; -unsigned int vm_pageout_burst_active_throttle = 0; -unsigned int vm_pageout_burst_inactive_throttle = 0; +#if !CONFIG_EMBEDDED +static boolean_t vm_pageout_waiter = FALSE; +#endif /* !CONFIG_EMBEDDED */ -/* - * Protection against zero fill flushing live working sets derived - * from existing backing store and files - */ -unsigned int vm_accellerate_zf_pageout_trigger = 400; -unsigned int zf_queue_min_count = 100; -unsigned int vm_zf_queue_count = 0; -#if defined(__ppc__) /* On ppc, vm statistics are still 32-bit */ -unsigned int vm_zf_count = 0; -#else -uint64_t vm_zf_count __attribute__((aligned(8))) = 0; +#if DEVELOPMENT || DEBUG +struct vm_pageout_debug vm_pageout_debug; #endif +struct vm_pageout_vminfo vm_pageout_vminfo; +struct vm_pageout_state vm_pageout_state; +struct vm_config vm_config; -/* - * These variables record the pageout daemon's actions: - * how many pages it looks at and what happens to those pages. - * No locking needed because only one thread modifies the variables. - */ - -unsigned int vm_pageout_active = 0; /* debugging */ -unsigned int vm_pageout_inactive = 0; /* debugging */ -unsigned int vm_pageout_inactive_throttled = 0; /* debugging */ -unsigned int vm_pageout_inactive_forced = 0; /* debugging */ -unsigned int vm_pageout_inactive_nolock = 0; /* debugging */ -unsigned int vm_pageout_inactive_avoid = 0; /* debugging */ -unsigned int vm_pageout_inactive_busy = 0; /* debugging */ -unsigned int vm_pageout_inactive_absent = 0; /* debugging */ -unsigned int vm_pageout_inactive_used = 0; /* debugging */ -unsigned int vm_pageout_inactive_clean = 0; /* debugging */ -unsigned int vm_pageout_inactive_dirty = 0; /* debugging */ -unsigned int vm_pageout_inactive_deactivated = 0; /* debugging */ -unsigned int vm_pageout_inactive_zf = 0; /* debugging */ -unsigned int vm_pageout_dirty_no_pager = 0; /* debugging */ -unsigned int vm_pageout_purged_objects = 0; /* debugging */ -unsigned int vm_stat_discard = 0; /* debugging */ -unsigned int vm_stat_discard_sent = 0; /* debugging */ -unsigned int vm_stat_discard_failure = 0; /* debugging */ -unsigned int vm_stat_discard_throttle = 0; /* debugging */ -unsigned int vm_pageout_reactivation_limit_exceeded = 0; /* debugging */ -unsigned int vm_pageout_catch_ups = 0; /* debugging */ -unsigned int vm_pageout_inactive_force_reclaim = 0; /* debugging */ - -unsigned int vm_pageout_scan_active_throttled = 0; -unsigned int vm_pageout_scan_inactive_throttled = 0; -unsigned int vm_pageout_scan_throttle = 0; /* debugging */ -unsigned int vm_pageout_scan_throttle_aborted = 0; /* debugging */ -unsigned int vm_pageout_scan_burst_throttle = 0; /* debugging */ -unsigned int vm_pageout_scan_empty_throttle = 0; /* debugging */ -unsigned int vm_pageout_scan_deadlock_detected = 0; /* debugging */ -unsigned int vm_pageout_scan_active_throttle_success = 0; /* debugging */ -unsigned int vm_pageout_scan_inactive_throttle_success = 0; /* debugging */ - -unsigned int vm_page_speculative_count_drifts = 0; -unsigned int vm_page_speculative_count_drift_max = 0; - -/* - * Backing store throttle when BS is exhausted - */ -unsigned int vm_backing_store_low = 0; +struct vm_pageout_queue vm_pageout_queue_internal VM_PAGE_PACKED_ALIGNED; +struct vm_pageout_queue vm_pageout_queue_external VM_PAGE_PACKED_ALIGNED; -unsigned int vm_pageout_out_of_line = 0; -unsigned int vm_pageout_in_place = 0; +int vm_upl_wait_for_pages = 0; +vm_object_t vm_pageout_scan_wants_object = VM_OBJECT_NULL; -unsigned int vm_page_steal_pageout_page = 0; - -/* - * ENCRYPTED SWAP: - * counters and statistics... - */ -unsigned long vm_page_decrypt_counter = 0; -unsigned long vm_page_decrypt_for_upl_counter = 0; -unsigned long vm_page_encrypt_counter = 0; -unsigned long vm_page_encrypt_abort_counter = 0; -unsigned long vm_page_encrypt_already_encrypted_counter = 0; -boolean_t vm_pages_encrypted = FALSE; /* are there encrypted pages ? */ +boolean_t(*volatile consider_buffer_cache_collect)(int) = NULL; -struct vm_pageout_queue vm_pageout_queue_internal; -struct vm_pageout_queue vm_pageout_queue_external; +int vm_debug_events = 0; -unsigned int vm_page_speculative_target = 0; +LCK_GRP_DECLARE(vm_pageout_lck_grp, "vm_pageout"); -vm_object_t vm_pageout_scan_wants_object = VM_OBJECT_NULL; +#if CONFIG_MEMORYSTATUS +extern boolean_t memorystatus_kill_on_VM_page_shortage(boolean_t async); -static boolean_t (* volatile consider_buffer_cache_collect)(void) = NULL; +uint32_t vm_pageout_memorystatus_fb_factor_nr = 5; +uint32_t vm_pageout_memorystatus_fb_factor_dr = 2; -#if DEVELOPMENT || DEBUG -unsigned long vm_cs_validated_resets = 0; #endif -/* - * Routine: vm_backing_store_disable - * Purpose: - * Suspend non-privileged threads wishing to extend - * backing store when we are low on backing store - * (Synchronized by caller) - */ -void -vm_backing_store_disable( - boolean_t disable) -{ - if(disable) { - vm_backing_store_low = 1; - } else { - if(vm_backing_store_low) { - vm_backing_store_low = 0; - thread_wakeup((event_t) &vm_backing_store_low); - } - } -} +#if __AMP__ +int vm_compressor_ebound = 1; +int vm_pgo_pbound = 0; +extern void thread_bind_cluster_type(thread_t, char, bool); +#endif /* __AMP__ */ -#if MACH_CLUSTER_STATS -unsigned long vm_pageout_cluster_dirtied = 0; -unsigned long vm_pageout_cluster_cleaned = 0; -unsigned long vm_pageout_cluster_collisions = 0; -unsigned long vm_pageout_cluster_clusters = 0; -unsigned long vm_pageout_cluster_conversions = 0; -unsigned long vm_pageout_target_collisions = 0; -unsigned long vm_pageout_target_page_dirtied = 0; -unsigned long vm_pageout_target_page_freed = 0; -#define CLUSTER_STAT(clause) clause -#else /* MACH_CLUSTER_STATS */ -#define CLUSTER_STAT(clause) -#endif /* MACH_CLUSTER_STATS */ - -/* +/* * Routine: vm_pageout_object_terminate * Purpose: * Destroy the pageout_object, and perform all of the * required cleanup actions. - * + * * In/Out conditions: * The object must be locked, and will be returned locked. */ void vm_pageout_object_terminate( - vm_object_t object) + vm_object_t object) { - vm_object_t shadow_object; + vm_object_t shadow_object; /* * Deal with the deallocation (last reference) of a pageout object @@ -452,43 +379,38 @@ vm_pageout_object_terminate( shadow_object = object->shadow; vm_object_lock(shadow_object); - while (!queue_empty(&object->memq)) { - vm_page_t p, m; - vm_object_offset_t offset; + while (!vm_page_queue_empty(&object->memq)) { + vm_page_t p, m; + vm_object_offset_t offset; - p = (vm_page_t) queue_first(&object->memq); + p = (vm_page_t) vm_page_queue_first(&object->memq); - assert(p->private); - assert(p->pageout); - p->pageout = FALSE; - assert(!p->cleaning); + assert(p->vmp_private); + assert(p->vmp_free_when_done); + p->vmp_free_when_done = FALSE; + assert(!p->vmp_cleaning); + assert(!p->vmp_laundry); - offset = p->offset; + offset = p->vmp_offset; VM_PAGE_FREE(p); p = VM_PAGE_NULL; m = vm_page_lookup(shadow_object, - offset + object->shadow_offset); + offset + object->vo_shadow_offset); - if(m == VM_PAGE_NULL) + if (m == VM_PAGE_NULL) { continue; - assert(m->cleaning); - /* used as a trigger on upl_commit etc to recognize the */ - /* pageout daemon's subseqent desire to pageout a cleaning */ - /* page. When the bit is on the upl commit code will */ - /* respect the pageout bit in the target page over the */ - /* caller's page list indication */ - m->dump_cleaning = FALSE; + } - assert((m->dirty) || (m->precious) || - (m->busy && m->cleaning)); + assert((m->vmp_dirty) || (m->vmp_precious) || + (m->vmp_busy && m->vmp_cleaning)); /* * Handle the trusted pager throttle. * Also decrement the burst throttle (if external). */ vm_page_lock_queues(); - if (m->laundry) { + if (m->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q) { vm_pageout_throttle_up(m); } @@ -500,15 +422,12 @@ vm_pageout_object_terminate( * pages may have been modified between the selection as an * adjacent page and conversion to a target. */ - if (m->pageout) { - assert(m->busy); - assert(m->wire_count == 1); - m->cleaning = FALSE; - m->encrypted_cleaning = FALSE; - m->pageout = FALSE; -#if MACH_CLUSTER_STATS - if (m->wanted) vm_pageout_target_collisions++; -#endif + if (m->vmp_free_when_done) { + assert(m->vmp_busy); + assert(m->vmp_q_state == VM_PAGE_IS_WIRED); + assert(m->vmp_wire_count == 1); + m->vmp_cleaning = FALSE; + m->vmp_free_when_done = FALSE; /* * Revoke all access to the page. Since the object is * locked, and the page is busy, this prevents the page @@ -519,19 +438,18 @@ vm_pageout_object_terminate( * can detect whether the page was redirtied during * pageout by checking the modify state. */ - if (pmap_disconnect(m->phys_page) & VM_MEM_MODIFIED) - m->dirty = TRUE; - else - m->dirty = FALSE; - - if (m->dirty) { - CLUSTER_STAT(vm_pageout_target_page_dirtied++;) - vm_page_unwire(m);/* reactivates */ + if (pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m)) & VM_MEM_MODIFIED) { + SET_PAGE_DIRTY(m, FALSE); + } else { + m->vmp_dirty = FALSE; + } + + if (m->vmp_dirty) { + vm_page_unwire(m, TRUE); /* reactivates */ VM_STAT_INCR(reactivations); PAGE_WAKEUP_DONE(m); } else { - CLUSTER_STAT(vm_pageout_target_page_freed++;) - vm_page_free(m);/* clears busy, etc. */ + vm_page_free(m); /* clears busy, etc. */ } vm_page_unlock_queues(); continue; @@ -542,57 +460,45 @@ vm_pageout_object_terminate( * If prep_pin_count is nonzero, then someone is using the * page, so make it active. */ - if (!m->active && !m->inactive && !m->throttled && !m->private) { - if (m->reference) + if ((m->vmp_q_state == VM_PAGE_NOT_ON_Q) && !m->vmp_private) { + if (m->vmp_reference) { vm_page_activate(m); - else + } else { vm_page_deactivate(m); + } } - if((m->busy) && (m->cleaning)) { - - /* the request_page_list case, (COPY_OUT_FROM FALSE) */ - m->busy = FALSE; - - /* We do not re-set m->dirty ! */ - /* The page was busy so no extraneous activity */ - /* could have occurred. COPY_INTO is a read into the */ - /* new pages. CLEAN_IN_PLACE does actually write */ - /* out the pages but handling outside of this code */ - /* will take care of resetting dirty. We clear the */ - /* modify however for the Programmed I/O case. */ - pmap_clear_modify(m->phys_page); - - m->absent = FALSE; - m->overwriting = FALSE; - } else if (m->overwriting) { - /* alternate request page list, write to page_list */ - /* case. Occurs when the original page was wired */ - /* at the time of the list request */ - assert(VM_PAGE_WIRED(m)); - vm_page_unwire(m);/* reactivates */ - m->overwriting = FALSE; - } else { - /* - * Set the dirty state according to whether or not the page was - * modified during the pageout. Note that we purposefully do - * NOT call pmap_clear_modify since the page is still mapped. - * If the page were to be dirtied between the 2 calls, this - * this fact would be lost. This code is only necessary to - * maintain statistics, since the pmap module is always - * consulted if m->dirty is false. - */ -#if MACH_CLUSTER_STATS - m->dirty = pmap_is_modified(m->phys_page); + if (m->vmp_overwriting) { + /* + * the (COPY_OUT_FROM == FALSE) request_page_list case + */ + if (m->vmp_busy) { + /* + * We do not re-set m->vmp_dirty ! + * The page was busy so no extraneous activity + * could have occurred. COPY_INTO is a read into the + * new pages. CLEAN_IN_PLACE does actually write + * out the pages but handling outside of this code + * will take care of resetting dirty. We clear the + * modify however for the Programmed I/O case. + */ + pmap_clear_modify(VM_PAGE_GET_PHYS_PAGE(m)); - if (m->dirty) vm_pageout_cluster_dirtied++; - else vm_pageout_cluster_cleaned++; - if (m->wanted) vm_pageout_cluster_collisions++; -#else - m->dirty = 0; -#endif + m->vmp_busy = FALSE; + m->vmp_absent = FALSE; + } else { + /* + * alternate (COPY_OUT_FROM == FALSE) request_page_list case + * Occurs when the original page was wired + * at the time of the list request + */ + assert(VM_PAGE_WIRED(m)); + vm_page_unwire(m, TRUE); /* reactivates */ + } + m->vmp_overwriting = FALSE; + } else { + m->vmp_dirty = FALSE; } - m->cleaning = FALSE; - m->encrypted_cleaning = FALSE; + m->vmp_cleaning = FALSE; /* * Wakeup any thread waiting for the page to be un-cleaning. @@ -624,50 +530,45 @@ vm_pageout_object_terminate( * must be locked. * */ -void +static void vm_pageclean_setup( - vm_page_t m, - vm_page_t new_m, - vm_object_t new_object, - vm_object_offset_t new_offset) + vm_page_t m, + vm_page_t new_m, + vm_object_t new_object, + vm_object_offset_t new_offset) { - assert(!m->busy); + assert(!m->vmp_busy); #if 0 - assert(!m->cleaning); + assert(!m->vmp_cleaning); #endif - XPR(XPR_VM_PAGEOUT, - "vm_pageclean_setup, obj 0x%X off 0x%X page 0x%X new 0x%X new_off 0x%X\n", - m->object, m->offset, m, - new_m, new_offset); - - pmap_clear_modify(m->phys_page); + pmap_clear_modify(VM_PAGE_GET_PHYS_PAGE(m)); /* * Mark original page as cleaning in place. */ - m->cleaning = TRUE; - m->dirty = TRUE; - m->precious = FALSE; + m->vmp_cleaning = TRUE; + SET_PAGE_DIRTY(m, FALSE); + m->vmp_precious = FALSE; /* * Convert the fictitious page to a private shadow of * the real page. */ - assert(new_m->fictitious); - assert(new_m->phys_page == vm_page_fictitious_addr); - new_m->fictitious = FALSE; - new_m->private = TRUE; - new_m->pageout = TRUE; - new_m->phys_page = m->phys_page; + assert(new_m->vmp_fictitious); + assert(VM_PAGE_GET_PHYS_PAGE(new_m) == vm_page_fictitious_addr); + new_m->vmp_fictitious = FALSE; + new_m->vmp_private = TRUE; + new_m->vmp_free_when_done = TRUE; + VM_PAGE_SET_PHYS_PAGE(new_m, VM_PAGE_GET_PHYS_PAGE(m)); vm_page_lockspin_queues(); - vm_page_wire(new_m); + vm_page_wire(new_m, VM_KERN_MEMORY_NONE, TRUE); vm_page_unlock_queues(); - vm_page_insert(new_m, new_object, new_offset); - assert(!new_m->wanted); - new_m->busy = FALSE; + vm_page_insert_wired(new_m, new_object, new_offset, VM_KERN_MEMORY_NONE); + assert(!new_m->vmp_wanted); + new_m->vmp_busy = FALSE; } /* @@ -688,43 +589,44 @@ vm_pageclean_setup( * Implementation: * Move this page to a completely new object. */ -void +void vm_pageout_initialize_page( - vm_page_t m) + vm_page_t m) { - vm_object_t object; - vm_object_offset_t paging_offset; - vm_page_t holding_page; - memory_object_t pager; + vm_object_t object; + vm_object_offset_t paging_offset; + memory_object_t pager; + + assert(VM_CONFIG_COMPRESSOR_IS_PRESENT); + + object = VM_PAGE_OBJECT(m); - XPR(XPR_VM_PAGEOUT, - "vm_pageout_initialize_page, page 0x%X\n", - m, 0, 0, 0, 0); - assert(m->busy); + assert(m->vmp_busy); + assert(object->internal); /* * Verify that we really want to clean this page */ - assert(!m->absent); - assert(!m->error); - assert(m->dirty); + assert(!m->vmp_absent); + assert(!m->vmp_error); + assert(m->vmp_dirty); /* * Create a paging reference to let us play with the object. */ - object = m->object; - paging_offset = m->offset + object->paging_offset; + paging_offset = m->vmp_offset + object->paging_offset; - if (m->absent || m->error || m->restart || (!m->dirty && !m->precious)) { - VM_PAGE_FREE(m); + if (m->vmp_absent || m->vmp_error || m->vmp_restart || (!m->vmp_dirty && !m->vmp_precious)) { panic("reservation without pageout?"); /* alan */ + + VM_PAGE_FREE(m); vm_object_unlock(object); return; } /* - * If there's no pager, then we can't clean the page. This should + * If there's no pager, then we can't clean the page. This should * never happen since this should be a copy object and therefore not * an external object, so the pager should always be there. */ @@ -732,26 +634,22 @@ vm_pageout_initialize_page( pager = object->pager; if (pager == MEMORY_OBJECT_NULL) { - VM_PAGE_FREE(m); panic("missing pager for copy object"); + + VM_PAGE_FREE(m); return; } - /* set the page for future call to vm_fault_list_request */ - vm_object_paging_begin(object); - holding_page = NULL; - - pmap_clear_modify(m->phys_page); - m->dirty = TRUE; - m->busy = TRUE; - m->list_req_pending = TRUE; - m->cleaning = TRUE; - m->pageout = TRUE; - - vm_page_lockspin_queues(); - vm_page_wire(m); - vm_page_unlock_queues(); + /* + * set the page for future call to vm_fault_list_request + */ + pmap_clear_modify(VM_PAGE_GET_PHYS_PAGE(m)); + SET_PAGE_DIRTY(m, FALSE); + /* + * keep the object from collapsing or terminating + */ + vm_object_paging_begin(object); vm_object_unlock(object); /* @@ -768,15 +666,6 @@ vm_pageout_initialize_page( vm_object_paging_end(object); } -#if MACH_CLUSTER_STATS -#define MAXCLUSTERPAGES 16 -struct { - unsigned long pages_in_cluster; - unsigned long pages_at_higher_offsets; - unsigned long pages_at_lower_offsets; -} cluster_stats[MAXCLUSTERPAGES]; -#endif /* MACH_CLUSTER_STATS */ - /* * vm_pageout_cluster: @@ -785,76 +674,80 @@ struct { * which will page it out and attempt to clean adjacent pages * in the same operation. * - * The page must be busy, and the object and queues locked. We will take a + * The object and queues must be locked. We will take a * paging reference to prevent deallocation or collapse when we * release the object lock back at the call site. The I/O thread * is responsible for consuming this reference * * The page must not be on any pageout queue. */ +#if DEVELOPMENT || DEBUG +vmct_stats_t vmct_stats; + +int32_t vmct_active = 0; +uint64_t vm_compressor_epoch_start = 0; +uint64_t vm_compressor_epoch_stop = 0; + +typedef enum vmct_state_t { + VMCT_IDLE, + VMCT_AWAKENED, + VMCT_ACTIVE, +} vmct_state_t; +vmct_state_t vmct_state[MAX_COMPRESSOR_THREAD_COUNT]; +#endif + void vm_pageout_cluster(vm_page_t m) { - vm_object_t object = m->object; - struct vm_pageout_queue *q; - - - XPR(XPR_VM_PAGEOUT, - "vm_pageout_cluster, object 0x%X offset 0x%X page 0x%X\n", - object, m->offset, m, 0, 0); + vm_object_t object = VM_PAGE_OBJECT(m); + struct vm_pageout_queue *q; VM_PAGE_CHECK(m); + LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_OWNED); + vm_object_lock_assert_exclusive(object); /* * Only a certain kind of page is appreciated here. */ - assert(m->busy && (m->dirty || m->precious) && (!VM_PAGE_WIRED(m))); - assert(!m->cleaning && !m->pageout && !m->inactive && !m->active); - assert(!m->throttled); + assert((m->vmp_dirty || m->vmp_precious) && (!VM_PAGE_WIRED(m))); + assert(!m->vmp_cleaning && !m->vmp_laundry); + assert(m->vmp_q_state == VM_PAGE_NOT_ON_Q); /* - * protect the object from collapse - - * locking in the object's paging_offset. + * protect the object from collapse or termination */ - vm_object_paging_begin(object); + vm_object_activity_begin(object); - /* - * set the page for future call to vm_fault_list_request - * page should already be marked busy - */ - vm_page_wire(m); - m->list_req_pending = TRUE; - m->cleaning = TRUE; - m->pageout = TRUE; + if (object->internal == TRUE) { + assert(VM_CONFIG_COMPRESSOR_IS_PRESENT); - if (object->internal == TRUE) - q = &vm_pageout_queue_internal; - else - q = &vm_pageout_queue_external; + m->vmp_busy = TRUE; - /* + q = &vm_pageout_queue_internal; + } else { + q = &vm_pageout_queue_external; + } + + /* * pgo_laundry count is tied to the laundry bit */ - m->laundry = TRUE; + m->vmp_laundry = TRUE; q->pgo_laundry++; - m->pageout_queue = TRUE; - queue_enter(&q->pgo_pending, m, vm_page_t, pageq); - + m->vmp_q_state = VM_PAGE_ON_PAGEOUT_Q; + vm_page_queue_enter(&q->pgo_pending, m, vmp_pageq); + if (q->pgo_idle == TRUE) { - q->pgo_idle = FALSE; - thread_wakeup((event_t) &q->pgo_pending); + q->pgo_idle = FALSE; + thread_wakeup((event_t) &q->pgo_pending); } - VM_PAGE_CHECK(m); } -unsigned long vm_pageout_throttle_up_count = 0; - /* - * A page is back from laundry or we are stealing it back from + * A page is back from laundry or we are stealing it back from * the laundering state. See if there are some pages waiting to * go to laundry and if we can let some of them go now. * @@ -862,59 +755,73 @@ unsigned long vm_pageout_throttle_up_count = 0; */ void vm_pageout_throttle_up( - vm_page_t m) + vm_page_t m) { - struct vm_pageout_queue *q; + struct vm_pageout_queue *q; + vm_object_t m_object; - assert(m->object != VM_OBJECT_NULL); - assert(m->object != kernel_object); + m_object = VM_PAGE_OBJECT(m); - vm_pageout_throttle_up_count++; - - if (m->object->internal == TRUE) - q = &vm_pageout_queue_internal; - else - q = &vm_pageout_queue_external; + assert(m_object != VM_OBJECT_NULL); + assert(m_object != kernel_object); - if (m->pageout_queue == TRUE) { + LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_OWNED); + vm_object_lock_assert_exclusive(m_object); - queue_remove(&q->pgo_pending, m, vm_page_t, pageq); - m->pageout_queue = FALSE; + if (m_object->internal == TRUE) { + q = &vm_pageout_queue_internal; + } else { + q = &vm_pageout_queue_external; + } - m->pageq.next = NULL; - m->pageq.prev = NULL; + if (m->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q) { + vm_page_queue_remove(&q->pgo_pending, m, vmp_pageq); + m->vmp_q_state = VM_PAGE_NOT_ON_Q; - vm_object_paging_end(m->object); - } + VM_PAGE_ZERO_PAGEQ_ENTRY(m); - if ( m->laundry == TRUE ) { + vm_object_activity_end(m_object); - m->laundry = FALSE; + VM_PAGEOUT_DEBUG(vm_page_steal_pageout_page, 1); + } + if (m->vmp_laundry == TRUE) { + m->vmp_laundry = FALSE; q->pgo_laundry--; + if (q->pgo_throttled == TRUE) { q->pgo_throttled = FALSE; thread_wakeup((event_t) &q->pgo_laundry); } + if (q->pgo_draining == TRUE && q->pgo_laundry == 0) { + q->pgo_draining = FALSE; + thread_wakeup((event_t) (&q->pgo_laundry + 1)); + } + VM_PAGEOUT_DEBUG(vm_pageout_throttle_up_count, 1); } } -/* - * vm_pageout_scan does the dirty work for the pageout daemon. - * It returns with vm_page_queue_free_lock held and - * vm_page_free_wanted == 0. - */ +static void +vm_pageout_throttle_up_batch( + struct vm_pageout_queue *q, + int batch_cnt) +{ + LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_OWNED); -#define VM_PAGEOUT_DELAYED_UNLOCK_LIMIT (3 * MAX_UPL_TRANSFER) + VM_PAGEOUT_DEBUG(vm_pageout_throttle_up_count, batch_cnt); -#define FCS_IDLE 0 -#define FCS_DELAYED 1 -#define FCS_DEADLOCK_DETECTED 2 + q->pgo_laundry -= batch_cnt; + + if (q->pgo_throttled == TRUE) { + q->pgo_throttled = FALSE; + thread_wakeup((event_t) &q->pgo_laundry); + } + if (q->pgo_draining == TRUE && q->pgo_laundry == 0) { + q->pgo_draining = FALSE; + thread_wakeup((event_t) (&q->pgo_laundry + 1)); + } +} -struct flow_control { - int state; - mach_timespec_t ts; -}; /* @@ -934,40 +841,114 @@ struct flow_control { * also returns the number of pages the system still needs to reclaim at this * moment in time. */ -#define VM_PAGEOUT_STAT_SIZE 31 +#if DEVELOPMENT || DEBUG +#define VM_PAGEOUT_STAT_SIZE (30 * 8) + 1 +#else +#define VM_PAGEOUT_STAT_SIZE (1 * 8) + 1 +#endif struct vm_pageout_stat { + unsigned long vm_page_active_count; + unsigned long vm_page_speculative_count; + unsigned long vm_page_inactive_count; + unsigned long vm_page_anonymous_count; + + unsigned long vm_page_free_count; + unsigned long vm_page_wire_count; + unsigned long vm_page_compressor_count; + + unsigned long vm_page_pages_compressed; + unsigned long vm_page_pageable_internal_count; + unsigned long vm_page_pageable_external_count; + unsigned long vm_page_xpmapped_external_count; + + unsigned int pages_grabbed; + unsigned int pages_freed; + + unsigned int pages_compressed; + unsigned int pages_grabbed_by_compressor; + unsigned int failed_compressions; + + unsigned int pages_evicted; + unsigned int pages_purged; + unsigned int considered; - unsigned int reclaimed; -} vm_pageout_stats[VM_PAGEOUT_STAT_SIZE] = {{0,0}, }; + unsigned int considered_bq_internal; + unsigned int considered_bq_external; + + unsigned int skipped_external; + unsigned int filecache_min_reactivations; + + unsigned int freed_speculative; + unsigned int freed_cleaned; + unsigned int freed_internal; + unsigned int freed_external; + + unsigned int cleaned_dirty_external; + unsigned int cleaned_dirty_internal; + + unsigned int inactive_referenced; + unsigned int inactive_nolock; + unsigned int reactivation_limit_exceeded; + unsigned int forced_inactive_reclaim; + + unsigned int throttled_internal_q; + unsigned int throttled_external_q; + + unsigned int phantom_ghosts_found; + unsigned int phantom_ghosts_added; +} vm_pageout_stats[VM_PAGEOUT_STAT_SIZE] = {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, }; + unsigned int vm_pageout_stat_now = 0; -unsigned int vm_memory_pressure = 0; #define VM_PAGEOUT_STAT_BEFORE(i) \ (((i) == 0) ? VM_PAGEOUT_STAT_SIZE - 1 : (i) - 1) #define VM_PAGEOUT_STAT_AFTER(i) \ (((i) == VM_PAGEOUT_STAT_SIZE - 1) ? 0 : (i) + 1) -/* - * Called from compute_averages(). - */ +#if VM_PAGE_BUCKETS_CHECK +int vm_page_buckets_check_interval = 80; /* in eighths of a second */ +#endif /* VM_PAGE_BUCKETS_CHECK */ + + void -compute_memory_pressure( - __unused void *arg) +record_memory_pressure(void); +void +record_memory_pressure(void) { unsigned int vm_pageout_next; - vm_memory_pressure = - vm_pageout_stats[VM_PAGEOUT_STAT_BEFORE(vm_pageout_stat_now)].reclaimed; +#if VM_PAGE_BUCKETS_CHECK + /* check the consistency of VM page buckets at regular interval */ + static int counter = 0; + if ((++counter % vm_page_buckets_check_interval) == 0) { + vm_page_buckets_check(); + } +#endif /* VM_PAGE_BUCKETS_CHECK */ + + vm_pageout_state.vm_memory_pressure = + vm_pageout_stats[VM_PAGEOUT_STAT_BEFORE(vm_pageout_stat_now)].freed_speculative + + vm_pageout_stats[VM_PAGEOUT_STAT_BEFORE(vm_pageout_stat_now)].freed_cleaned + + vm_pageout_stats[VM_PAGEOUT_STAT_BEFORE(vm_pageout_stat_now)].freed_internal + + vm_pageout_stats[VM_PAGEOUT_STAT_BEFORE(vm_pageout_stat_now)].freed_external; - commpage_set_memory_pressure( vm_memory_pressure ); + commpage_set_memory_pressure((unsigned int)vm_pageout_state.vm_memory_pressure ); /* move "now" forward */ vm_pageout_next = VM_PAGEOUT_STAT_AFTER(vm_pageout_stat_now); - vm_pageout_stats[vm_pageout_next].considered = 0; - vm_pageout_stats[vm_pageout_next].reclaimed = 0; + + bzero(&vm_pageout_stats[vm_pageout_next], sizeof(struct vm_pageout_stat)); + vm_pageout_stat_now = vm_pageout_next; } + +/* + * IMPORTANT + * mach_vm_ctl_page_free_wanted() is called indirectly, via + * mach_vm_pressure_monitor(), when taking a stackshot. Therefore, + * it must be safe in the restricted stackshot context. Locks and/or + * blocking are not allowable. + */ unsigned int mach_vm_ctl_page_free_wanted(void) { @@ -984,17 +965,28 @@ mach_vm_ctl_page_free_wanted(void) return page_free_wanted; } + +/* + * IMPORTANT: + * mach_vm_pressure_monitor() is called when taking a stackshot, with + * wait_for_pressure FALSE, so that code path must remain safe in the + * restricted stackshot context. No blocking or locks are allowable. + * on that code path. + */ + kern_return_t mach_vm_pressure_monitor( - boolean_t wait_for_pressure, - unsigned int nsecs_monitored, - unsigned int *pages_reclaimed_p, - unsigned int *pages_wanted_p) + boolean_t wait_for_pressure, + unsigned int nsecs_monitored, + unsigned int *pages_reclaimed_p, + unsigned int *pages_wanted_p) { - wait_result_t wr; - unsigned int vm_pageout_then, vm_pageout_now; - unsigned int pages_reclaimed; + wait_result_t wr; + unsigned int vm_pageout_then, vm_pageout_now; + unsigned int pages_reclaimed; + unsigned int units_of_monitor; + units_of_monitor = 8 * nsecs_monitored; /* * We don't take the vm_page_queue_lock here because we don't want * vm_pressure_monitor() to get in the way of the vm_pageout_scan() @@ -1006,7 +998,7 @@ mach_vm_pressure_monitor( /* wait until there's memory pressure */ while (vm_page_free_count >= vm_page_free_target) { wr = assert_wait((event_t) &vm_page_free_wanted, - THREAD_INTERRUPTIBLE); + THREAD_INTERRUPTIBLE); if (wr == THREAD_WAITING) { wr = thread_block(THREAD_CONTINUE_NULL); } @@ -1035,3565 +1027,7137 @@ mach_vm_pressure_monitor( } /* provide number of pages reclaimed in the last "nsecs_monitored" */ - do { - vm_pageout_now = vm_pageout_stat_now; - pages_reclaimed = 0; - for (vm_pageout_then = - VM_PAGEOUT_STAT_BEFORE(vm_pageout_now); - vm_pageout_then != vm_pageout_now && - nsecs_monitored-- != 0; - vm_pageout_then = - VM_PAGEOUT_STAT_BEFORE(vm_pageout_then)) { - pages_reclaimed += vm_pageout_stats[vm_pageout_then].reclaimed; - } - } while (vm_pageout_now != vm_pageout_stat_now); + vm_pageout_now = vm_pageout_stat_now; + pages_reclaimed = 0; + for (vm_pageout_then = + VM_PAGEOUT_STAT_BEFORE(vm_pageout_now); + vm_pageout_then != vm_pageout_now && + units_of_monitor-- != 0; + vm_pageout_then = + VM_PAGEOUT_STAT_BEFORE(vm_pageout_then)) { + pages_reclaimed += vm_pageout_stats[vm_pageout_then].freed_speculative; + pages_reclaimed += vm_pageout_stats[vm_pageout_then].freed_cleaned; + pages_reclaimed += vm_pageout_stats[vm_pageout_then].freed_internal; + pages_reclaimed += vm_pageout_stats[vm_pageout_then].freed_external; + } *pages_reclaimed_p = pages_reclaimed; return KERN_SUCCESS; } -/* Page States: Used below to maintain the page state - before it's removed from it's Q. This saved state - helps us do the right accounting in certain cases -*/ - -#define PAGE_STATE_SPECULATIVE 1 -#define PAGE_STATE_THROTTLED 2 -#define PAGE_STATE_ZEROFILL 3 -#define PAGE_STATE_INACTIVE 4 - -#define VM_PAGEOUT_SCAN_HANDLE_REUSABLE_PAGE(m) \ - MACRO_BEGIN \ - /* \ - * If a "reusable" page somehow made it back into \ - * the active queue, it's been re-used and is not \ - * quite re-usable. \ - * If the VM object was "all_reusable", consider it \ - * as "all re-used" instead of converting it to \ - * "partially re-used", which could be expensive. \ - */ \ - if ((m)->reusable || \ - (m)->object->all_reusable) { \ - vm_object_reuse_pages((m)->object, \ - (m)->offset, \ - (m)->offset + PAGE_SIZE_64, \ - FALSE); \ - } \ - MACRO_END -void -vm_pageout_scan(void) -{ - unsigned int loop_count = 0; - unsigned int inactive_burst_count = 0; - unsigned int active_burst_count = 0; - unsigned int reactivated_this_call; - unsigned int reactivate_limit; - vm_page_t local_freeq = NULL; - int local_freed = 0; - int delayed_unlock; - int refmod_state = 0; - int vm_pageout_deadlock_target = 0; - struct vm_pageout_queue *iq; - struct vm_pageout_queue *eq; - struct vm_speculative_age_q *sq; - struct flow_control flow_control = { 0, { 0, 0 } }; - boolean_t inactive_throttled = FALSE; - boolean_t try_failed; - mach_timespec_t ts; - unsigned int msecs = 0; - vm_object_t object; - vm_object_t last_object_tried; -#if defined(__ppc__) /* On ppc, vm statistics are still 32-bit */ - unsigned int zf_ratio; - unsigned int zf_run_count; -#else - uint64_t zf_ratio; - uint64_t zf_run_count; -#endif - uint32_t catch_up_count = 0; - uint32_t inactive_reclaim_run; - boolean_t forced_reclaim; - int page_prev_state = 0; - flow_control.state = FCS_IDLE; - iq = &vm_pageout_queue_internal; - eq = &vm_pageout_queue_external; - sq = &vm_page_queue_speculative[VM_PAGE_SPECULATIVE_AGED_Q]; +#if DEVELOPMENT || DEBUG +static void +vm_pageout_disconnect_all_pages_in_queue(vm_page_queue_head_t *, int); - XPR(XPR_VM_PAGEOUT, "vm_pageout_scan\n", 0, 0, 0, 0, 0); +/* + * condition variable used to make sure there is + * only a single sweep going on at a time + */ +boolean_t vm_pageout_disconnect_all_pages_active = FALSE; - - vm_page_lock_queues(); - delayed_unlock = 1; /* must be nonzero if Qs are locked, 0 if unlocked */ - /* - * Calculate the max number of referenced pages on the inactive - * queue that we will reactivate. - */ - reactivated_this_call = 0; - reactivate_limit = VM_PAGE_REACTIVATE_LIMIT(vm_page_active_count + - vm_page_inactive_count); - inactive_reclaim_run = 0; +void +vm_pageout_disconnect_all_pages() +{ + vm_page_lock_queues(); + if (vm_pageout_disconnect_all_pages_active == TRUE) { + vm_page_unlock_queues(); + return; + } + vm_pageout_disconnect_all_pages_active = TRUE; + vm_page_unlock_queues(); -/*???*/ /* - * We want to gradually dribble pages from the active queue - * to the inactive queue. If we let the inactive queue get - * very small, and then suddenly dump many pages into it, - * those pages won't get a sufficient chance to be referenced - * before we start taking them from the inactive queue. - * - * We must limit the rate at which we send pages to the pagers. - * data_write messages consume memory, for message buffers and - * for map-copy objects. If we get too far ahead of the pagers, - * we can potentially run out of memory. - * - * We can use the laundry count to limit directly the number - * of pages outstanding to the default pager. A similar - * strategy for external pagers doesn't work, because - * external pagers don't have to deallocate the pages sent them, - * and because we might have to send pages to external pagers - * even if they aren't processing writes. So we also - * use a burst count to limit writes to external pagers. - * - * When memory is very tight, we can't rely on external pagers to - * clean pages. They probably aren't running, because they - * aren't vm-privileged. If we kept sending dirty pages to them, - * we could exhaust the free list. - */ + vm_pageout_disconnect_all_pages_in_queue(&vm_page_queue_throttled, vm_page_throttled_count); + vm_pageout_disconnect_all_pages_in_queue(&vm_page_queue_anonymous, vm_page_anonymous_count); + vm_pageout_disconnect_all_pages_in_queue(&vm_page_queue_active, vm_page_active_count); + vm_pageout_disconnect_all_pages_active = FALSE; +} -Restart: - assert(delayed_unlock!=0); - - /* - * A page is "zero-filled" if it was not paged in from somewhere, - * and it belongs to an object at least VM_ZF_OBJECT_SIZE_THRESHOLD big. - * Recalculate the zero-filled page ratio. We use this to apportion - * victimized pages between the normal and zero-filled inactive - * queues according to their relative abundance in memory. Thus if a task - * is flooding memory with zf pages, we begin to hunt them down. - * It would be better to throttle greedy tasks at a higher level, - * but at the moment mach vm cannot do this. - */ - { -#if defined(__ppc__) /* On ppc, vm statistics are still 32-bit */ - uint32_t total = vm_page_active_count + vm_page_inactive_count; - uint32_t normal = total - vm_zf_count; -#else - uint64_t total = vm_page_active_count + vm_page_inactive_count; - uint64_t normal = total - vm_zf_count; -#endif - /* zf_ratio is the number of zf pages we victimize per normal page */ - - if (vm_zf_count < vm_accellerate_zf_pageout_trigger) - zf_ratio = 0; - else if ((vm_zf_count <= normal) || (normal == 0)) - zf_ratio = 1; - else - zf_ratio = vm_zf_count / normal; - - zf_run_count = 0; - } - - /* - * Recalculate vm_page_inactivate_target. - */ - vm_page_inactive_target = VM_PAGE_INACTIVE_TARGET(vm_page_active_count + - vm_page_inactive_count + - vm_page_speculative_count); - /* - * don't want to wake the pageout_scan thread up everytime we fall below - * the targets... set a low water mark at 0.25% below the target - */ - vm_page_inactive_min = vm_page_inactive_target - (vm_page_inactive_target / 400); - - vm_page_speculative_target = VM_PAGE_SPECULATIVE_TARGET(vm_page_active_count + - vm_page_inactive_count); - object = NULL; - last_object_tried = NULL; - try_failed = FALSE; - - if ((vm_page_inactive_count + vm_page_speculative_count) < VM_PAGE_INACTIVE_HEALTHY_LIMIT(vm_page_active_count)) - catch_up_count = vm_page_inactive_count + vm_page_speculative_count; - else - catch_up_count = 0; - - for (;;) { - vm_page_t m; +void +vm_pageout_disconnect_all_pages_in_queue(vm_page_queue_head_t *q, int qcount) +{ + vm_page_t m; + vm_object_t t_object = NULL; + vm_object_t l_object = NULL; + vm_object_t m_object = NULL; + int delayed_unlock = 0; + int try_failed_count = 0; + int disconnected_count = 0; + int paused_count = 0; + int object_locked_count = 0; + + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, (MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_DISCONNECT_ALL_PAGE_MAPPINGS)) | DBG_FUNC_START, + q, qcount, 0, 0, 0); - DTRACE_VM2(rev, int, 1, (uint64_t *), NULL); + vm_page_lock_queues(); - if (delayed_unlock == 0) { - vm_page_lock_queues(); - delayed_unlock = 1; - } + while (qcount && !vm_page_queue_empty(q)) { + LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_OWNED); - /* - * Don't sweep through active queue more than the throttle - * which should be kept relatively low - */ - active_burst_count = MIN(vm_pageout_burst_active_throttle, - vm_page_active_count); + m = (vm_page_t) vm_page_queue_first(q); + m_object = VM_PAGE_OBJECT(m); /* - * Move pages from active to inactive. + * check to see if we currently are working + * with the same object... if so, we've + * already got the lock */ - if ((vm_page_inactive_count + vm_page_speculative_count) >= vm_page_inactive_target) - goto done_moving_active_pages; - - while (!queue_empty(&vm_page_queue_active) && active_burst_count) { - - if (active_burst_count) - active_burst_count--; - - vm_pageout_active++; - - m = (vm_page_t) queue_first(&vm_page_queue_active); - - assert(m->active && !m->inactive); - assert(!m->laundry); - assert(m->object != kernel_object); - assert(m->phys_page != vm_page_guard_addr); - - DTRACE_VM2(scan, int, 1, (uint64_t *), NULL); + if (m_object != l_object) { + /* + * the object associated with candidate page is + * different from the one we were just working + * with... dump the lock if we still own it + */ + if (l_object != NULL) { + vm_object_unlock(l_object); + l_object = NULL; + } + if (m_object != t_object) { + try_failed_count = 0; + } /* - * Try to lock object; since we've already got the + * Try to lock object; since we've alread got the * page queues lock, we can only 'try' for this one. * if the 'try' fails, we need to do a mutex_pause * to allow the owner of the object lock a chance to - * run... otherwise, we're likely to trip over this - * object in the same state as we work our way through - * the queue... clumps of pages associated with the same - * object are fairly typical on the inactive and active queues + * run... */ - if (m->object != object) { - if (object != NULL) { - vm_object_unlock(object); - object = NULL; - vm_pageout_scan_wants_object = VM_OBJECT_NULL; + if (!vm_object_lock_try_scan(m_object)) { + if (try_failed_count > 20) { + goto reenter_pg_on_q; } - if (!vm_object_lock_try_scan(m->object)) { - /* - * move page to end of active queue and continue - */ - queue_remove(&vm_page_queue_active, m, - vm_page_t, pageq); - queue_enter(&vm_page_queue_active, m, - vm_page_t, pageq); - - try_failed = TRUE; - - m = (vm_page_t) queue_first(&vm_page_queue_active); - /* - * this is the next object we're going to be interested in - * try to make sure it's available after the mutex_yield - * returns control - */ - vm_pageout_scan_wants_object = m->object; - - goto done_with_activepage; - } - object = m->object; - - try_failed = FALSE; - } - - /* - * if the page is BUSY, then we pull it - * off the active queue and leave it alone. - * when BUSY is cleared, it will get stuck - * back on the appropriate queue - */ - if (m->busy) { - queue_remove(&vm_page_queue_active, m, - vm_page_t, pageq); - m->pageq.next = NULL; - m->pageq.prev = NULL; + vm_page_unlock_queues(); + mutex_pause(try_failed_count++); + vm_page_lock_queues(); + delayed_unlock = 0; - if (!m->fictitious) - vm_page_active_count--; - m->active = FALSE; + paused_count++; - goto done_with_activepage; + t_object = m_object; + continue; } + object_locked_count++; - /* deal with a rogue "reusable" page */ - VM_PAGEOUT_SCAN_HANDLE_REUSABLE_PAGE(m); - + l_object = m_object; + } + if (!m_object->alive || m->vmp_cleaning || m->vmp_laundry || m->vmp_busy || m->vmp_absent || m->vmp_error || m->vmp_free_when_done) { /* - * Deactivate the page while holding the object - * locked, so we know the page is still not busy. - * This should prevent races between pmap_enter - * and pmap_clear_reference. The page might be - * absent or fictitious, but vm_page_deactivate - * can handle that. + * put it back on the head of its queue */ - vm_page_deactivate(m); - -done_with_activepage: - if (delayed_unlock++ > VM_PAGEOUT_DELAYED_UNLOCK_LIMIT || try_failed == TRUE) { - - if (object != NULL) { - vm_pageout_scan_wants_object = VM_OBJECT_NULL; - vm_object_unlock(object); - object = NULL; - } - if (local_freeq) { - vm_page_unlock_queues(); - vm_page_free_list(local_freeq, TRUE); - - local_freeq = NULL; - local_freed = 0; - vm_page_lock_queues(); - } else - lck_mtx_yield(&vm_page_queue_lock); - - delayed_unlock = 1; - - /* - * continue the while loop processing - * the active queue... need to hold - * the page queues lock - */ - } + goto reenter_pg_on_q; } + if (m->vmp_pmapped == TRUE) { + pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m)); + disconnected_count++; + } +reenter_pg_on_q: + vm_page_queue_remove(q, m, vmp_pageq); + vm_page_queue_enter(q, m, vmp_pageq); + qcount--; + try_failed_count = 0; - /********************************************************************** - * above this point we're playing with the active queue - * below this point we're playing with the throttling mechanisms - * and the inactive queue - **********************************************************************/ - -done_moving_active_pages: - - /* - * We are done if we have met our target *and* - * nobody is still waiting for a page. - */ - if (vm_page_free_count + local_freed >= vm_page_free_target) { - if (object != NULL) { - vm_object_unlock(object); - object = NULL; - } - vm_pageout_scan_wants_object = VM_OBJECT_NULL; - - if (local_freeq) { - vm_page_unlock_queues(); - vm_page_free_list(local_freeq, TRUE); - - local_freeq = NULL; - local_freed = 0; - vm_page_lock_queues(); + if (delayed_unlock++ > 128) { + if (l_object != NULL) { + vm_object_unlock(l_object); + l_object = NULL; } - /* - * inactive target still not met... keep going - * until we get the queues balanced - */ + lck_mtx_yield(&vm_page_queue_lock); + delayed_unlock = 0; + } + } + if (l_object != NULL) { + vm_object_unlock(l_object); + l_object = NULL; + } + vm_page_unlock_queues(); - /* - * Recalculate vm_page_inactivate_target. - */ - vm_page_inactive_target = VM_PAGE_INACTIVE_TARGET(vm_page_active_count + - vm_page_inactive_count + - vm_page_speculative_count); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, (MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_DISCONNECT_ALL_PAGE_MAPPINGS)) | DBG_FUNC_END, + q, disconnected_count, object_locked_count, paused_count, 0); +} -#ifndef CONFIG_EMBEDDED - /* - * XXX: if no active pages can be reclaimed, pageout scan can be stuck trying - * to balance the queues - */ - if (((vm_page_inactive_count + vm_page_speculative_count) < vm_page_inactive_target) && - !queue_empty(&vm_page_queue_active)) - continue; #endif - lck_mtx_lock(&vm_page_queue_free_lock); - if ((vm_page_free_count >= vm_page_free_target) && - (vm_page_free_wanted == 0) && (vm_page_free_wanted_privileged == 0)) { +static void +vm_pageout_page_queue(vm_page_queue_head_t *, int); - vm_page_unlock_queues(); +/* + * condition variable used to make sure there is + * only a single sweep going on at a time + */ +boolean_t vm_pageout_anonymous_pages_active = FALSE; - thread_wakeup((event_t) &vm_pageout_garbage_collect); - assert(vm_pageout_scan_wants_object == VM_OBJECT_NULL); +void +vm_pageout_anonymous_pages() +{ + if (VM_CONFIG_COMPRESSOR_IS_PRESENT) { + vm_page_lock_queues(); - return; - } - lck_mtx_unlock(&vm_page_queue_free_lock); - } - - /* - * Before anything, we check if we have any ripe volatile - * objects around. If so, try to purge the first object. - * If the purge fails, fall through to reclaim a page instead. - * If the purge succeeds, go back to the top and reevalute - * the new memory situation. - */ - assert (available_for_purge>=0); - if (available_for_purge) - { - if (object != NULL) { - vm_object_unlock(object); - object = NULL; - } - if(TRUE == vm_purgeable_object_purge_one()) { - continue; - } + if (vm_pageout_anonymous_pages_active == TRUE) { + vm_page_unlock_queues(); + return; } - - if (queue_empty(&sq->age_q) && vm_page_speculative_count) { - /* - * try to pull pages from the aging bins - * see vm_page.h for an explanation of how - * this mechanism works - */ - struct vm_speculative_age_q *aq; - mach_timespec_t ts_fully_aged; - boolean_t can_steal = FALSE; - int num_scanned_queues; - - aq = &vm_page_queue_speculative[speculative_steal_index]; - - num_scanned_queues = 0; - while (queue_empty(&aq->age_q) && - num_scanned_queues++ != VM_PAGE_MAX_SPECULATIVE_AGE_Q) { - - speculative_steal_index++; - - if (speculative_steal_index > VM_PAGE_MAX_SPECULATIVE_AGE_Q) - speculative_steal_index = VM_PAGE_MIN_SPECULATIVE_AGE_Q; - - aq = &vm_page_queue_speculative[speculative_steal_index]; - } - - if (num_scanned_queues == - VM_PAGE_MAX_SPECULATIVE_AGE_Q + 1) { - /* - * XXX We've scanned all the speculative - * queues but still haven't found one - * that is not empty, even though - * vm_page_speculative_count is not 0. - */ - /* report the anomaly... */ - printf("vm_pageout_scan: " - "all speculative queues empty " - "but count=%d. Re-adjusting.\n", - vm_page_speculative_count); - if (vm_page_speculative_count > - vm_page_speculative_count_drift_max) - vm_page_speculative_count_drift_max = vm_page_speculative_count; - vm_page_speculative_count_drifts++; -#if 6553678 - Debugger("vm_pageout_scan: no speculative pages"); -#endif - /* readjust... */ - vm_page_speculative_count = 0; - /* ... and continue */ - continue; - } - - if (vm_page_speculative_count > vm_page_speculative_target) - can_steal = TRUE; - else { - ts_fully_aged.tv_sec = (VM_PAGE_MAX_SPECULATIVE_AGE_Q * VM_PAGE_SPECULATIVE_Q_AGE_MS) / 1000; - ts_fully_aged.tv_nsec = ((VM_PAGE_MAX_SPECULATIVE_AGE_Q * VM_PAGE_SPECULATIVE_Q_AGE_MS) % 1000) - * 1000 * NSEC_PER_USEC; - - ADD_MACH_TIMESPEC(&ts_fully_aged, &aq->age_ts); + vm_pageout_anonymous_pages_active = TRUE; + vm_page_unlock_queues(); - clock_sec_t sec; - clock_nsec_t nsec; - clock_get_system_nanotime(&sec, &nsec); - ts.tv_sec = (unsigned int) sec; - ts.tv_nsec = nsec; + vm_pageout_page_queue(&vm_page_queue_throttled, vm_page_throttled_count); + vm_pageout_page_queue(&vm_page_queue_anonymous, vm_page_anonymous_count); + vm_pageout_page_queue(&vm_page_queue_active, vm_page_active_count); - if (CMP_MACH_TIMESPEC(&ts, &ts_fully_aged) >= 0) - can_steal = TRUE; - } - if (can_steal == TRUE) - vm_page_speculate_ageit(aq); + if (VM_CONFIG_SWAP_IS_PRESENT) { + vm_consider_swapping(); } - /* - * Sometimes we have to pause: - * 1) No inactive pages - nothing to do. - * 2) Flow control - default pageout queue is full - * 3) Loop control - no acceptable pages found on the inactive queue - * within the last vm_pageout_burst_inactive_throttle iterations - */ - if (queue_empty(&vm_page_queue_inactive) && queue_empty(&vm_page_queue_zf) && queue_empty(&sq->age_q) && - (VM_PAGE_Q_THROTTLED(iq) || queue_empty(&vm_page_queue_throttled))) { - vm_pageout_scan_empty_throttle++; - msecs = vm_pageout_empty_wait; - goto vm_pageout_scan_delay; - - } else if (inactive_burst_count >= - MIN(vm_pageout_burst_inactive_throttle, - (vm_page_inactive_count + - vm_page_speculative_count))) { - vm_pageout_scan_burst_throttle++; - msecs = vm_pageout_burst_wait; - goto vm_pageout_scan_delay; - - } else if (VM_PAGE_Q_THROTTLED(iq) && IP_VALID(memory_manager_default)) { - clock_sec_t sec; - clock_nsec_t nsec; - - switch (flow_control.state) { - - case FCS_IDLE: -reset_deadlock_timer: - ts.tv_sec = vm_pageout_deadlock_wait / 1000; - ts.tv_nsec = (vm_pageout_deadlock_wait % 1000) * 1000 * NSEC_PER_USEC; - clock_get_system_nanotime(&sec, &nsec); - flow_control.ts.tv_sec = (unsigned int) sec; - flow_control.ts.tv_nsec = nsec; - ADD_MACH_TIMESPEC(&flow_control.ts, &ts); - - flow_control.state = FCS_DELAYED; - msecs = vm_pageout_deadlock_wait; + vm_page_lock_queues(); + vm_pageout_anonymous_pages_active = FALSE; + vm_page_unlock_queues(); + } +} - break; - - case FCS_DELAYED: - clock_get_system_nanotime(&sec, &nsec); - ts.tv_sec = (unsigned int) sec; - ts.tv_nsec = nsec; - - if (CMP_MACH_TIMESPEC(&ts, &flow_control.ts) >= 0) { - /* - * the pageout thread for the default pager is potentially - * deadlocked since the - * default pager queue has been throttled for more than the - * allowable time... we need to move some clean pages or dirty - * pages belonging to the external pagers if they aren't throttled - * vm_page_free_wanted represents the number of threads currently - * blocked waiting for pages... we'll move one page for each of - * these plus a fixed amount to break the logjam... once we're done - * moving this number of pages, we'll re-enter the FSC_DELAYED state - * with a new timeout target since we have no way of knowing - * whether we've broken the deadlock except through observation - * of the queue associated with the default pager... we need to - * stop moving pages and allow the system to run to see what - * state it settles into. - */ - vm_pageout_deadlock_target = vm_pageout_deadlock_relief + vm_page_free_wanted + vm_page_free_wanted_privileged; - vm_pageout_scan_deadlock_detected++; - flow_control.state = FCS_DEADLOCK_DETECTED; - thread_wakeup((event_t) &vm_pageout_garbage_collect); - goto consider_inactive; - } - /* - * just resniff instead of trying - * to compute a new delay time... we're going to be - * awakened immediately upon a laundry completion, - * so we won't wait any longer than necessary - */ - msecs = vm_pageout_idle_wait; - break; +void +vm_pageout_page_queue(vm_page_queue_head_t *q, int qcount) +{ + vm_page_t m; + vm_object_t t_object = NULL; + vm_object_t l_object = NULL; + vm_object_t m_object = NULL; + int delayed_unlock = 0; + int try_failed_count = 0; + int refmod_state; + int pmap_options; + struct vm_pageout_queue *iq; + ppnum_t phys_page; - case FCS_DEADLOCK_DETECTED: - if (vm_pageout_deadlock_target) - goto consider_inactive; - goto reset_deadlock_timer; - } - vm_pageout_scan_throttle++; - iq->pgo_throttled = TRUE; -vm_pageout_scan_delay: - if (object != NULL) { - vm_object_unlock(object); - object = NULL; - } - vm_pageout_scan_wants_object = VM_OBJECT_NULL; + iq = &vm_pageout_queue_internal; - if (local_freeq) { - vm_page_unlock_queues(); - vm_page_free_list(local_freeq, TRUE); - - local_freeq = NULL; - local_freed = 0; - vm_page_lock_queues(); + vm_page_lock_queues(); - if (flow_control.state == FCS_DELAYED && - !VM_PAGE_Q_THROTTLED(iq)) { - flow_control.state = FCS_IDLE; - vm_pageout_scan_throttle_aborted++; - goto consider_inactive; - } - } -#if CONFIG_EMBEDDED - { - int percent_avail; + while (qcount && !vm_page_queue_empty(q)) { + LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_OWNED); - /* - * Decide if we need to send a memory status notification. - */ - percent_avail = - (vm_page_active_count + vm_page_inactive_count + - vm_page_speculative_count + vm_page_free_count + - (IP_VALID(memory_manager_default)?0:vm_page_purgeable_count) ) * 100 / - atop_64(max_mem); - if (percent_avail >= (kern_memorystatus_level + 5) || - percent_avail <= (kern_memorystatus_level - 5)) { - kern_memorystatus_level = percent_avail; - thread_wakeup((event_t)&kern_memorystatus_wakeup); - } + if (VM_PAGE_Q_THROTTLED(iq)) { + if (l_object != NULL) { + vm_object_unlock(l_object); + l_object = NULL; } -#endif - assert_wait_timeout((event_t) &iq->pgo_laundry, THREAD_INTERRUPTIBLE, msecs, 1000*NSEC_PER_USEC); - counter(c_vm_pageout_scan_block++); + iq->pgo_draining = TRUE; + assert_wait((event_t) (&iq->pgo_laundry + 1), THREAD_INTERRUPTIBLE); vm_page_unlock_queues(); - assert(vm_pageout_scan_wants_object == VM_OBJECT_NULL); - thread_block(THREAD_CONTINUE_NULL); vm_page_lock_queues(); - delayed_unlock = 1; - - iq->pgo_throttled = FALSE; - - if (loop_count >= vm_page_inactive_count) - loop_count = 0; - inactive_burst_count = 0; - - goto Restart; - /*NOTREACHED*/ - } - - - flow_control.state = FCS_IDLE; -consider_inactive: - loop_count++; - inactive_burst_count++; - vm_pageout_inactive++; - - /* Choose a victim. */ - - while (1) { - m = NULL; - - if (IP_VALID(memory_manager_default)) { - assert(vm_page_throttled_count == 0); - assert(queue_empty(&vm_page_queue_throttled)); - } - - /* - * The most eligible pages are ones we paged in speculatively, - * but which have not yet been touched. - */ - if ( !queue_empty(&sq->age_q) ) { - m = (vm_page_t) queue_first(&sq->age_q); - break; - } - /* - * Time for a zero-filled inactive page? - */ - if ( ((zf_run_count < zf_ratio) && vm_zf_queue_count >= zf_queue_min_count) || - queue_empty(&vm_page_queue_inactive)) { - if ( !queue_empty(&vm_page_queue_zf) ) { - m = (vm_page_t) queue_first(&vm_page_queue_zf); - zf_run_count++; - break; - } - } - /* - * It's either a normal inactive page or nothing. - */ - if ( !queue_empty(&vm_page_queue_inactive) ) { - m = (vm_page_t) queue_first(&vm_page_queue_inactive); - zf_run_count = 0; - break; - } - - panic("vm_pageout: no victim"); - } - - assert(!m->active && (m->inactive || m->speculative || m->throttled)); - assert(!m->laundry); - assert(m->object != kernel_object); - assert(m->phys_page != vm_page_guard_addr); - - if (!m->speculative) { - vm_pageout_stats[vm_pageout_stat_now].considered++; + delayed_unlock = 0; + continue; } - - DTRACE_VM2(scan, int, 1, (uint64_t *), NULL); + m = (vm_page_t) vm_page_queue_first(q); + m_object = VM_PAGE_OBJECT(m); /* * check to see if we currently are working * with the same object... if so, we've * already got the lock */ - if (m->object != object) { - /* - * the object associated with candidate page is + if (m_object != l_object) { + if (!m_object->internal) { + goto reenter_pg_on_q; + } + + /* + * the object associated with candidate page is * different from the one we were just working * with... dump the lock if we still own it */ - if (object != NULL) { - vm_object_unlock(object); - object = NULL; - vm_pageout_scan_wants_object = VM_OBJECT_NULL; + if (l_object != NULL) { + vm_object_unlock(l_object); + l_object = NULL; } + if (m_object != t_object) { + try_failed_count = 0; + } + /* * Try to lock object; since we've alread got the * page queues lock, we can only 'try' for this one. * if the 'try' fails, we need to do a mutex_pause * to allow the owner of the object lock a chance to - * run... otherwise, we're likely to trip over this - * object in the same state as we work our way through - * the queue... clumps of pages associated with the same - * object are fairly typical on the inactive and active queues + * run... */ - if (!vm_object_lock_try_scan(m->object)) { - vm_pageout_inactive_nolock++; - - requeue_page: - /* - * Move page to end and continue. - * Don't re-issue ticket - */ - if (m->zero_fill) { - if (m->speculative) { - panic("vm_pageout_scan(): page %p speculative and zero-fill !?\n", m); - } - assert(!m->speculative); - queue_remove(&vm_page_queue_zf, m, - vm_page_t, pageq); - queue_enter(&vm_page_queue_zf, m, - vm_page_t, pageq); - } else if (m->speculative) { - remque(&m->pageq); - m->speculative = FALSE; - vm_page_speculative_count--; - - /* - * move to the head of the inactive queue - * to get it out of the way... the speculative - * queue is generally too small to depend - * on there being enough pages from other - * objects to make cycling it back on the - * same queue a winning proposition - */ - queue_enter_first(&vm_page_queue_inactive, m, - vm_page_t, pageq); - m->inactive = TRUE; - vm_page_inactive_count++; - token_new_pagecount++; - } else if (m->throttled) { - queue_remove(&vm_page_queue_throttled, m, - vm_page_t, pageq); - m->throttled = FALSE; - vm_page_throttled_count--; - - /* - * not throttled any more, so can stick - * it on the inactive queue. - */ - queue_enter(&vm_page_queue_inactive, m, - vm_page_t, pageq); - m->inactive = TRUE; - vm_page_inactive_count++; - token_new_pagecount++; - } else { - queue_remove(&vm_page_queue_inactive, m, - vm_page_t, pageq); -#if MACH_ASSERT - vm_page_inactive_count--; /* balance for purgeable queue asserts */ -#endif - vm_purgeable_q_advance_all(); - - queue_enter(&vm_page_queue_inactive, m, - vm_page_t, pageq); -#if MACH_ASSERT - vm_page_inactive_count++; /* balance for purgeable queue asserts */ -#endif - token_new_pagecount++; - } - pmap_clear_reference(m->phys_page); - m->reference = FALSE; - - if ( !queue_empty(&sq->age_q) ) - m = (vm_page_t) queue_first(&sq->age_q); - else if ( ((zf_run_count < zf_ratio) && vm_zf_queue_count >= zf_queue_min_count) || - queue_empty(&vm_page_queue_inactive)) { - if ( !queue_empty(&vm_page_queue_zf) ) - m = (vm_page_t) queue_first(&vm_page_queue_zf); - } else if ( !queue_empty(&vm_page_queue_inactive) ) { - m = (vm_page_t) queue_first(&vm_page_queue_inactive); + if (!vm_object_lock_try_scan(m_object)) { + if (try_failed_count > 20) { + goto reenter_pg_on_q; } - /* - * this is the next object we're going to be interested in - * try to make sure its available after the mutex_yield - * returns control - */ - vm_pageout_scan_wants_object = m->object; - - /* - * force us to dump any collected free pages - * and to pause before moving on - */ - try_failed = TRUE; + vm_page_unlock_queues(); + mutex_pause(try_failed_count++); + vm_page_lock_queues(); + delayed_unlock = 0; - goto done_with_inactivepage; + t_object = m_object; + continue; } - object = m->object; - vm_pageout_scan_wants_object = VM_OBJECT_NULL; - - try_failed = FALSE; + l_object = m_object; } - - /* - * Paging out pages of external objects which - * are currently being created must be avoided. - * The pager may claim for memory, thus leading to a - * possible dead lock between it and the pageout thread, - * if such pages are finally chosen. The remaining assumption - * is that there will finally be enough available pages in the - * inactive pool to page out in order to satisfy all memory - * claimed by the thread which concurrently creates the pager. - */ - if (!object->pager_initialized && object->pager_created) { + if (!m_object->alive || m->vmp_cleaning || m->vmp_laundry || m->vmp_busy || m->vmp_absent || m->vmp_error || m->vmp_free_when_done) { /* - * Move page to end and continue, hoping that - * there will be enough other inactive pages to - * page out so that the thread which currently - * initializes the pager will succeed. - * Don't re-grant the ticket, the page should - * pulled from the queue and paged out whenever - * one of its logically adjacent fellows is - * targeted. + * page is not to be cleaned + * put it back on the head of its queue */ - vm_pageout_inactive_avoid++; - goto requeue_page; + goto reenter_pg_on_q; } - /* - * Remove the page from its list. - */ - if (m->speculative) { - remque(&m->pageq); - page_prev_state = PAGE_STATE_SPECULATIVE; - m->speculative = FALSE; - vm_page_speculative_count--; - } else if (m->throttled) { - queue_remove(&vm_page_queue_throttled, m, vm_page_t, pageq); - page_prev_state = PAGE_STATE_THROTTLED; - m->throttled = FALSE; - vm_page_throttled_count--; - } else { - if (m->zero_fill) { - queue_remove(&vm_page_queue_zf, m, vm_page_t, pageq); - page_prev_state = PAGE_STATE_ZEROFILL; - vm_zf_queue_count--; + phys_page = VM_PAGE_GET_PHYS_PAGE(m); + + if (m->vmp_reference == FALSE && m->vmp_pmapped == TRUE) { + refmod_state = pmap_get_refmod(phys_page); + + if (refmod_state & VM_MEM_REFERENCED) { + m->vmp_reference = TRUE; + } + if (refmod_state & VM_MEM_MODIFIED) { + SET_PAGE_DIRTY(m, FALSE); + } + } + if (m->vmp_reference == TRUE) { + m->vmp_reference = FALSE; + pmap_clear_refmod_options(phys_page, VM_MEM_REFERENCED, PMAP_OPTIONS_NOFLUSH, (void *)NULL); + goto reenter_pg_on_q; + } + if (m->vmp_pmapped == TRUE) { + if (m->vmp_dirty || m->vmp_precious) { + pmap_options = PMAP_OPTIONS_COMPRESSOR; } else { - page_prev_state = PAGE_STATE_INACTIVE; - queue_remove(&vm_page_queue_inactive, m, vm_page_t, pageq); + pmap_options = PMAP_OPTIONS_COMPRESSOR_IFF_MODIFIED; + } + refmod_state = pmap_disconnect_options(phys_page, pmap_options, NULL); + if (refmod_state & VM_MEM_MODIFIED) { + SET_PAGE_DIRTY(m, FALSE); } - m->inactive = FALSE; - if (!m->fictitious) - vm_page_inactive_count--; - vm_purgeable_q_advance_all(); } - m->pageq.next = NULL; - m->pageq.prev = NULL; + if (!m->vmp_dirty && !m->vmp_precious) { + vm_page_unlock_queues(); + VM_PAGE_FREE(m); + vm_page_lock_queues(); + delayed_unlock = 0; - if ( !m->fictitious && catch_up_count) - catch_up_count--; + goto next_pg; + } + if (!m_object->pager_initialized || m_object->pager == MEMORY_OBJECT_NULL) { + if (!m_object->pager_initialized) { + vm_page_unlock_queues(); - /* - * ENCRYPTED SWAP: - * if this page has already been picked up as part of a - * page-out cluster, it will be busy because it is being - * encrypted (see vm_object_upl_request()). But we still - * want to demote it from "clean-in-place" (aka "adjacent") - * to "clean-and-free" (aka "target"), so let's ignore its - * "busy" bit here and proceed to check for "cleaning" a - * little bit below... - */ - if ( !m->encrypted_cleaning && (m->busy || !object->alive)) { + vm_object_collapse(m_object, (vm_object_offset_t) 0, TRUE); + + if (!m_object->pager_initialized) { + vm_object_compressor_pager_create(m_object); + } + + vm_page_lock_queues(); + delayed_unlock = 0; + } + if (!m_object->pager_initialized || m_object->pager == MEMORY_OBJECT_NULL) { + goto reenter_pg_on_q; + } /* - * Somebody is already playing with this page. - * Leave it off the pageout queues. - * + * vm_object_compressor_pager_create will drop the object lock + * which means 'm' may no longer be valid to use */ - vm_pageout_inactive_busy++; - - goto done_with_inactivepage; + continue; } - /* - * If it's absent or in error, we can reclaim the page. + * we've already factored out pages in the laundry which + * means this page can't be on the pageout queue so it's + * safe to do the vm_page_queues_remove */ + vm_page_queues_remove(m, TRUE); - if (m->absent || m->error) { - vm_pageout_inactive_absent++; -reclaim_page: - if (vm_pageout_deadlock_target) { - vm_pageout_scan_inactive_throttle_success++; - vm_pageout_deadlock_target--; - } - - DTRACE_VM2(dfree, int, 1, (uint64_t *), NULL); - - if (object->internal) { - DTRACE_VM2(anonfree, int, 1, (uint64_t *), NULL); - } else { - DTRACE_VM2(fsfree, int, 1, (uint64_t *), NULL); - } - vm_page_free_prepare_queues(m); + LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_OWNED); - /* - * remove page from object here since we're already - * behind the object lock... defer the rest of the work - * we'd normally do in vm_page_free_prepare_object - * until 'vm_page_free_list' is called - */ - if (m->tabled) - vm_page_remove(m, TRUE); + vm_pageout_cluster(m); - assert(m->pageq.next == NULL && - m->pageq.prev == NULL); - m->pageq.next = (queue_entry_t)local_freeq; - local_freeq = m; - local_freed++; + goto next_pg; - inactive_burst_count = 0; +reenter_pg_on_q: + vm_page_queue_remove(q, m, vmp_pageq); + vm_page_queue_enter(q, m, vmp_pageq); +next_pg: + qcount--; + try_failed_count = 0; - if(page_prev_state != PAGE_STATE_SPECULATIVE) { - vm_pageout_stats[vm_pageout_stat_now].reclaimed++; - page_prev_state = 0; + if (delayed_unlock++ > 128) { + if (l_object != NULL) { + vm_object_unlock(l_object); + l_object = NULL; } - - goto done_with_inactivepage; + lck_mtx_yield(&vm_page_queue_lock); + delayed_unlock = 0; } + } + if (l_object != NULL) { + vm_object_unlock(l_object); + l_object = NULL; + } + vm_page_unlock_queues(); +} - assert(!m->private); - assert(!m->fictitious); - /* - * If already cleaning this page in place, convert from - * "adjacent" to "target". We can leave the page mapped, - * and vm_pageout_object_terminate will determine whether - * to free or reactivate. - */ - if (m->cleaning) { - m->busy = TRUE; - m->pageout = TRUE; - m->dump_cleaning = TRUE; - vm_page_wire(m); +/* + * function in BSD to apply I/O throttle to the pageout thread + */ +extern void vm_pageout_io_throttle(void); + +#define VM_PAGEOUT_SCAN_HANDLE_REUSABLE_PAGE(m, obj) \ + MACRO_BEGIN \ + /* \ + * If a "reusable" page somehow made it back into \ + * the active queue, it's been re-used and is not \ + * quite re-usable. \ + * If the VM object was "all_reusable", consider it \ + * as "all re-used" instead of converting it to \ + * "partially re-used", which could be expensive. \ + */ \ + assert(VM_PAGE_OBJECT((m)) == (obj)); \ + if ((m)->vmp_reusable || \ + (obj)->all_reusable) { \ + vm_object_reuse_pages((obj), \ + (m)->vmp_offset, \ + (m)->vmp_offset + PAGE_SIZE_64, \ + FALSE); \ + } \ + MACRO_END - CLUSTER_STAT(vm_pageout_cluster_conversions++); - inactive_burst_count = 0; +#define VM_PAGEOUT_DELAYED_UNLOCK_LIMIT 64 +#define VM_PAGEOUT_DELAYED_UNLOCK_LIMIT_MAX 1024 - goto done_with_inactivepage; - } +#define FCS_IDLE 0 +#define FCS_DELAYED 1 +#define FCS_DEADLOCK_DETECTED 2 - /* - * If the object is empty, the page must be reclaimed even - * if dirty or used. - * If the page belongs to a volatile object, we stick it back - * on. - */ - if (object->copy == VM_OBJECT_NULL) { - if (object->purgable == VM_PURGABLE_EMPTY) { - m->busy = TRUE; - if (m->pmapped == TRUE) { - /* unmap the page */ - refmod_state = pmap_disconnect(m->phys_page); - if (refmod_state & VM_MEM_MODIFIED) { - m->dirty = TRUE; - } - } - if (m->dirty || m->precious) { - /* we saved the cost of cleaning this page ! */ - vm_page_purged_count++; - } - goto reclaim_page; - } - if (object->purgable == VM_PURGABLE_VOLATILE) { - /* if it's wired, we can't put it on our queue */ - assert(!VM_PAGE_WIRED(m)); - /* just stick it back on! */ - goto reactivate_page; - } - } - - /* - * If it's being used, reactivate. - * (Fictitious pages are either busy or absent.) - * First, update the reference and dirty bits - * to make sure the page is unreferenced. - */ - refmod_state = -1; +struct flow_control { + int state; + mach_timespec_t ts; +}; - if (m->reference == FALSE && m->pmapped == TRUE) { - refmod_state = pmap_get_refmod(m->phys_page); - - if (refmod_state & VM_MEM_REFERENCED) - m->reference = TRUE; - if (refmod_state & VM_MEM_MODIFIED) - m->dirty = TRUE; - } - if (m->reference || m->dirty) { - /* deal with a rogue "reusable" page */ - VM_PAGEOUT_SCAN_HANDLE_REUSABLE_PAGE(m); - } +#if CONFIG_BACKGROUND_QUEUE +uint64_t vm_pageout_rejected_bq_internal = 0; +uint64_t vm_pageout_rejected_bq_external = 0; +uint64_t vm_pageout_skipped_bq_internal = 0; +#endif - if (m->reference && !m->no_cache) { - /* - * The page we pulled off the inactive list has - * been referenced. It is possible for other - * processors to be touching pages faster than we - * can clear the referenced bit and traverse the - * inactive queue, so we limit the number of - * reactivations. - */ - if (++reactivated_this_call >= reactivate_limit) { - vm_pageout_reactivation_limit_exceeded++; - } else if (catch_up_count) { - vm_pageout_catch_ups++; - } else if (++inactive_reclaim_run >= VM_PAGEOUT_INACTIVE_FORCE_RECLAIM) { - vm_pageout_inactive_force_reclaim++; - } else { - uint32_t isinuse; -reactivate_page: - if ( !object->internal && object->pager != MEMORY_OBJECT_NULL && - vnode_pager_get_isinuse(object->pager, &isinuse) == KERN_SUCCESS && !isinuse) { - /* - * no explict mappings of this object exist - * and it's not open via the filesystem - */ - vm_page_deactivate(m); - vm_pageout_inactive_deactivated++; - } else { - /* - * The page was/is being used, so put back on active list. - */ - vm_page_activate(m); - VM_STAT_INCR(reactivations); - } - vm_pageout_inactive_used++; - inactive_burst_count = 0; +#define ANONS_GRABBED_LIMIT 2 - goto done_with_inactivepage; - } - /* - * Make sure we call pmap_get_refmod() if it - * wasn't already called just above, to update - * the dirty bit. - */ - if ((refmod_state == -1) && !m->dirty && m->pmapped) { - refmod_state = pmap_get_refmod(m->phys_page); - if (refmod_state & VM_MEM_MODIFIED) - m->dirty = TRUE; - } - forced_reclaim = TRUE; - } else { - forced_reclaim = FALSE; - } - XPR(XPR_VM_PAGEOUT, - "vm_pageout_scan, replace object 0x%X offset 0x%X page 0x%X\n", - object, m->offset, m, 0,0); +#if 0 +static void vm_pageout_delayed_unlock(int *, int *, vm_page_t *); +#endif +static void vm_pageout_prepare_to_block(vm_object_t *, int *, vm_page_t *, int *, int); - /* - * we've got a candidate page to steal... - * - * m->dirty is up to date courtesy of the - * preceding check for m->reference... if - * we get here, then m->reference had to be - * FALSE (or possibly "reactivate_limit" was - * exceeded), but in either case we called - * pmap_get_refmod() and updated both - * m->reference and m->dirty - * - * if it's dirty or precious we need to - * see if the target queue is throtttled - * it if is, we need to skip over it by moving it back - * to the end of the inactive queue - */ +#define VM_PAGEOUT_PB_NO_ACTION 0 +#define VM_PAGEOUT_PB_CONSIDER_WAKING_COMPACTOR_SWAPPER 1 +#define VM_PAGEOUT_PB_THREAD_YIELD 2 - inactive_throttled = FALSE; - if (m->dirty || m->precious) { - if (object->internal) { - if (VM_PAGE_Q_THROTTLED(iq)) - inactive_throttled = TRUE; - } else if (VM_PAGE_Q_THROTTLED(eq)) { - inactive_throttled = TRUE; - } - } - if (inactive_throttled == TRUE) { -throttle_inactive: - if (!IP_VALID(memory_manager_default) && - object->internal && m->dirty && - (object->purgable == VM_PURGABLE_DENY || - object->purgable == VM_PURGABLE_NONVOLATILE || - object->purgable == VM_PURGABLE_VOLATILE)) { - queue_enter(&vm_page_queue_throttled, m, - vm_page_t, pageq); - m->throttled = TRUE; - vm_page_throttled_count++; - } else { - if (m->zero_fill) { - queue_enter(&vm_page_queue_zf, m, - vm_page_t, pageq); - vm_zf_queue_count++; - } else - queue_enter(&vm_page_queue_inactive, m, - vm_page_t, pageq); - m->inactive = TRUE; - if (!m->fictitious) { - vm_page_inactive_count++; - token_new_pagecount++; - } - } - vm_pageout_scan_inactive_throttled++; - goto done_with_inactivepage; - } +#if 0 +static void +vm_pageout_delayed_unlock(int *delayed_unlock, int *local_freed, vm_page_t *local_freeq) +{ + if (*local_freeq) { + vm_page_unlock_queues(); - /* - * we've got a page that we can steal... - * eliminate all mappings and make sure - * we have the up-to-date modified state - * first take the page BUSY, so that no new - * mappings can be made - */ - m->busy = TRUE; - - /* - * if we need to do a pmap_disconnect then we - * need to re-evaluate m->dirty since the pmap_disconnect - * provides the true state atomically... the - * page was still mapped up to the pmap_disconnect - * and may have been dirtied at the last microsecond - * - * we also check for the page being referenced 'late' - * if it was, we first need to do a WAKEUP_DONE on it - * since we already set m->busy = TRUE, before - * going off to reactivate it - * - * Note that if 'pmapped' is FALSE then the page is not - * and has not been in any map, so there is no point calling - * pmap_disconnect(). m->dirty and/or m->reference could - * have been set in anticipation of likely usage of the page. - */ - if (m->pmapped == TRUE) { - refmod_state = pmap_disconnect(m->phys_page); - - if (refmod_state & VM_MEM_MODIFIED) - m->dirty = TRUE; - if (refmod_state & VM_MEM_REFERENCED) { - - /* If m->reference is already set, this page must have - * already failed the reactivate_limit test, so don't - * bump the counts twice. - */ - if ( ! m->reference ) { - m->reference = TRUE; - if (forced_reclaim || - ++reactivated_this_call >= reactivate_limit) - vm_pageout_reactivation_limit_exceeded++; - else { - PAGE_WAKEUP_DONE(m); - goto reactivate_page; - } - } - } - } - /* - * reset our count of pages that have been reclaimed - * since the last page was 'stolen' - */ - inactive_reclaim_run = 0; + VM_DEBUG_CONSTANT_EVENT( + vm_pageout_freelist, VM_PAGEOUT_FREELIST, DBG_FUNC_START, + vm_page_free_count, 0, 0, 1); - /* - * If it's clean and not precious, we can free the page. - */ - if (!m->dirty && !m->precious) { - if (m->zero_fill) - vm_pageout_inactive_zf++; - vm_pageout_inactive_clean++; + vm_page_free_list(*local_freeq, TRUE); - goto reclaim_page; - } + VM_DEBUG_CONSTANT_EVENT(vm_pageout_freelist, VM_PAGEOUT_FREELIST, DBG_FUNC_END, + vm_page_free_count, *local_freed, 0, 1); - /* - * The page may have been dirtied since the last check - * for a throttled target queue (which may have been skipped - * if the page was clean then). With the dirty page - * disconnected here, we can make one final check. - */ - { - boolean_t disconnect_throttled = FALSE; - if (object->internal) { - if (VM_PAGE_Q_THROTTLED(iq)) - disconnect_throttled = TRUE; - } else if (VM_PAGE_Q_THROTTLED(eq)) { - disconnect_throttled = TRUE; - } + *local_freeq = NULL; + *local_freed = 0; - if (disconnect_throttled == TRUE) { - PAGE_WAKEUP_DONE(m); - goto throttle_inactive; - } - } + vm_page_lock_queues(); + } else { + lck_mtx_yield(&vm_page_queue_lock); + } + *delayed_unlock = 1; +} +#endif - vm_pageout_stats[vm_pageout_stat_now].reclaimed++; - vm_pageout_cluster(m); +static void +vm_pageout_prepare_to_block(vm_object_t *object, int *delayed_unlock, + vm_page_t *local_freeq, int *local_freed, int action) +{ + vm_page_unlock_queues(); - if (m->zero_fill) - vm_pageout_inactive_zf++; - vm_pageout_inactive_dirty++; + if (*object != NULL) { + vm_object_unlock(*object); + *object = NULL; + } + if (*local_freeq) { + vm_page_free_list(*local_freeq, TRUE); - inactive_burst_count = 0; + *local_freeq = NULL; + *local_freed = 0; + } + *delayed_unlock = 1; + + switch (action) { + case VM_PAGEOUT_PB_CONSIDER_WAKING_COMPACTOR_SWAPPER: + vm_consider_waking_compactor_swapper(); + break; + case VM_PAGEOUT_PB_THREAD_YIELD: + thread_yield_internal(1); + break; + case VM_PAGEOUT_PB_NO_ACTION: + default: + break; + } + vm_page_lock_queues(); +} -done_with_inactivepage: - if (delayed_unlock++ > VM_PAGEOUT_DELAYED_UNLOCK_LIMIT || try_failed == TRUE) { - if (object != NULL) { - vm_pageout_scan_wants_object = VM_OBJECT_NULL; - vm_object_unlock(object); - object = NULL; - } - if (local_freeq) { - vm_page_unlock_queues(); - vm_page_free_list(local_freeq, TRUE); - - local_freeq = NULL; - local_freed = 0; - vm_page_lock_queues(); - } else - lck_mtx_yield(&vm_page_queue_lock); +static struct vm_pageout_vminfo last; - delayed_unlock = 1; - } - /* - * back to top of pageout scan loop - */ - } -} +uint64_t last_vm_page_pages_grabbed = 0; +extern uint32_t c_segment_pages_compressed; -int vm_page_free_count_init; +extern uint64_t shared_region_pager_reclaimed; +extern struct memory_object_pager_ops shared_region_pager_ops; void -vm_page_free_reserve( - int pages) +update_vm_info(void) { - int free_after_reserve; - - vm_page_free_reserved += pages; + unsigned long tmp; + uint64_t tmp64; - free_after_reserve = vm_page_free_count_init - vm_page_free_reserved; + vm_pageout_stats[vm_pageout_stat_now].vm_page_active_count = vm_page_active_count; + vm_pageout_stats[vm_pageout_stat_now].vm_page_speculative_count = vm_page_speculative_count; + vm_pageout_stats[vm_pageout_stat_now].vm_page_inactive_count = vm_page_inactive_count; + vm_pageout_stats[vm_pageout_stat_now].vm_page_anonymous_count = vm_page_anonymous_count; - vm_page_free_min = vm_page_free_reserved + - VM_PAGE_FREE_MIN(free_after_reserve); + vm_pageout_stats[vm_pageout_stat_now].vm_page_free_count = vm_page_free_count; + vm_pageout_stats[vm_pageout_stat_now].vm_page_wire_count = vm_page_wire_count; + vm_pageout_stats[vm_pageout_stat_now].vm_page_compressor_count = VM_PAGE_COMPRESSOR_COUNT; - if (vm_page_free_min > VM_PAGE_FREE_MIN_LIMIT) - vm_page_free_min = VM_PAGE_FREE_MIN_LIMIT; + vm_pageout_stats[vm_pageout_stat_now].vm_page_pages_compressed = c_segment_pages_compressed; + vm_pageout_stats[vm_pageout_stat_now].vm_page_pageable_internal_count = vm_page_pageable_internal_count; + vm_pageout_stats[vm_pageout_stat_now].vm_page_pageable_external_count = vm_page_pageable_external_count; + vm_pageout_stats[vm_pageout_stat_now].vm_page_xpmapped_external_count = vm_page_xpmapped_external_count; - vm_page_free_target = vm_page_free_reserved + - VM_PAGE_FREE_TARGET(free_after_reserve); - if (vm_page_free_target > VM_PAGE_FREE_TARGET_LIMIT) - vm_page_free_target = VM_PAGE_FREE_TARGET_LIMIT; + tmp = vm_pageout_vminfo.vm_pageout_considered_page; + vm_pageout_stats[vm_pageout_stat_now].considered = (unsigned int)(tmp - last.vm_pageout_considered_page); + last.vm_pageout_considered_page = tmp; - if (vm_page_free_target < vm_page_free_min + 5) - vm_page_free_target = vm_page_free_min + 5; + tmp64 = vm_pageout_vminfo.vm_pageout_compressions; + vm_pageout_stats[vm_pageout_stat_now].pages_compressed = (unsigned int)(tmp64 - last.vm_pageout_compressions); + last.vm_pageout_compressions = tmp64; - vm_page_throttle_limit = vm_page_free_target - (vm_page_free_target / 3); - vm_page_creation_throttle = vm_page_free_target / 2; -} + tmp = vm_pageout_vminfo.vm_compressor_failed; + vm_pageout_stats[vm_pageout_stat_now].failed_compressions = (unsigned int)(tmp - last.vm_compressor_failed); + last.vm_compressor_failed = tmp; -/* - * vm_pageout is the high level pageout daemon. - */ + tmp64 = vm_pageout_vminfo.vm_compressor_pages_grabbed; + vm_pageout_stats[vm_pageout_stat_now].pages_grabbed_by_compressor = (unsigned int)(tmp64 - last.vm_compressor_pages_grabbed); + last.vm_compressor_pages_grabbed = tmp64; -void -vm_pageout_continue(void) -{ - DTRACE_VM2(pgrrun, int, 1, (uint64_t *), NULL); - vm_pageout_scan_event_counter++; - vm_pageout_scan(); - /* we hold vm_page_queue_free_lock now */ - assert(vm_page_free_wanted == 0); - assert(vm_page_free_wanted_privileged == 0); - assert_wait((event_t) &vm_page_free_wanted, THREAD_UNINT); - lck_mtx_unlock(&vm_page_queue_free_lock); + tmp = vm_pageout_vminfo.vm_phantom_cache_found_ghost; + vm_pageout_stats[vm_pageout_stat_now].phantom_ghosts_found = (unsigned int)(tmp - last.vm_phantom_cache_found_ghost); + last.vm_phantom_cache_found_ghost = tmp; - counter(c_vm_pageout_block++); - thread_block((thread_continue_t)vm_pageout_continue); - /*NOTREACHED*/ -} + tmp = vm_pageout_vminfo.vm_phantom_cache_added_ghost; + vm_pageout_stats[vm_pageout_stat_now].phantom_ghosts_added = (unsigned int)(tmp - last.vm_phantom_cache_added_ghost); + last.vm_phantom_cache_added_ghost = tmp; + tmp64 = get_pages_grabbed_count(); + vm_pageout_stats[vm_pageout_stat_now].pages_grabbed = (unsigned int)(tmp64 - last_vm_page_pages_grabbed); + last_vm_page_pages_grabbed = tmp64; -#ifdef FAKE_DEADLOCK + tmp = vm_pageout_vminfo.vm_page_pages_freed; + vm_pageout_stats[vm_pageout_stat_now].pages_freed = (unsigned int)(tmp - last.vm_page_pages_freed); + last.vm_page_pages_freed = tmp; -#define FAKE_COUNT 5000 -int internal_count = 0; -int fake_deadlock = 0; + if (vm_pageout_stats[vm_pageout_stat_now].considered) { + tmp = vm_pageout_vminfo.vm_pageout_pages_evicted; + vm_pageout_stats[vm_pageout_stat_now].pages_evicted = (unsigned int)(tmp - last.vm_pageout_pages_evicted); + last.vm_pageout_pages_evicted = tmp; -#endif + tmp = vm_pageout_vminfo.vm_pageout_pages_purged; + vm_pageout_stats[vm_pageout_stat_now].pages_purged = (unsigned int)(tmp - last.vm_pageout_pages_purged); + last.vm_pageout_pages_purged = tmp; -static void -vm_pageout_iothread_continue(struct vm_pageout_queue *q) -{ - vm_page_t m = NULL; - vm_object_t object; - boolean_t need_wakeup; - memory_object_t pager; - thread_t self = current_thread(); + tmp = vm_pageout_vminfo.vm_pageout_freed_speculative; + vm_pageout_stats[vm_pageout_stat_now].freed_speculative = (unsigned int)(tmp - last.vm_pageout_freed_speculative); + last.vm_pageout_freed_speculative = tmp; - if ((vm_pageout_internal_iothread != THREAD_NULL) - && (self == vm_pageout_external_iothread ) - && (self->options & TH_OPT_VMPRIV)) - self->options &= ~TH_OPT_VMPRIV; + tmp = vm_pageout_vminfo.vm_pageout_freed_external; + vm_pageout_stats[vm_pageout_stat_now].freed_external = (unsigned int)(tmp - last.vm_pageout_freed_external); + last.vm_pageout_freed_external = tmp; - vm_page_lockspin_queues(); + tmp = vm_pageout_vminfo.vm_pageout_inactive_referenced; + vm_pageout_stats[vm_pageout_stat_now].inactive_referenced = (unsigned int)(tmp - last.vm_pageout_inactive_referenced); + last.vm_pageout_inactive_referenced = tmp; - while ( !queue_empty(&q->pgo_pending) ) { + tmp = vm_pageout_vminfo.vm_pageout_scan_inactive_throttled_external; + vm_pageout_stats[vm_pageout_stat_now].throttled_external_q = (unsigned int)(tmp - last.vm_pageout_scan_inactive_throttled_external); + last.vm_pageout_scan_inactive_throttled_external = tmp; - q->pgo_busy = TRUE; - queue_remove_first(&q->pgo_pending, m, vm_page_t, pageq); - VM_PAGE_CHECK(m); - m->pageout_queue = FALSE; - m->pageq.next = NULL; - m->pageq.prev = NULL; - vm_page_unlock_queues(); + tmp = vm_pageout_vminfo.vm_pageout_inactive_dirty_external; + vm_pageout_stats[vm_pageout_stat_now].cleaned_dirty_external = (unsigned int)(tmp - last.vm_pageout_inactive_dirty_external); + last.vm_pageout_inactive_dirty_external = tmp; -#ifdef FAKE_DEADLOCK - if (q == &vm_pageout_queue_internal) { - vm_offset_t addr; - int pg_count; + tmp = vm_pageout_vminfo.vm_pageout_freed_cleaned; + vm_pageout_stats[vm_pageout_stat_now].freed_cleaned = (unsigned int)(tmp - last.vm_pageout_freed_cleaned); + last.vm_pageout_freed_cleaned = tmp; - internal_count++; + tmp = vm_pageout_vminfo.vm_pageout_inactive_nolock; + vm_pageout_stats[vm_pageout_stat_now].inactive_nolock = (unsigned int)(tmp - last.vm_pageout_inactive_nolock); + last.vm_pageout_inactive_nolock = tmp; - if ((internal_count == FAKE_COUNT)) { + tmp = vm_pageout_vminfo.vm_pageout_scan_inactive_throttled_internal; + vm_pageout_stats[vm_pageout_stat_now].throttled_internal_q = (unsigned int)(tmp - last.vm_pageout_scan_inactive_throttled_internal); + last.vm_pageout_scan_inactive_throttled_internal = tmp; - pg_count = vm_page_free_count + vm_page_free_reserved; + tmp = vm_pageout_vminfo.vm_pageout_skipped_external; + vm_pageout_stats[vm_pageout_stat_now].skipped_external = (unsigned int)(tmp - last.vm_pageout_skipped_external); + last.vm_pageout_skipped_external = tmp; - if (kmem_alloc(kernel_map, &addr, PAGE_SIZE * pg_count) == KERN_SUCCESS) { - kmem_free(kernel_map, addr, PAGE_SIZE * pg_count); - } - internal_count = 0; - fake_deadlock++; - } - } -#endif - object = m->object; - - vm_object_lock(object); - - if (!object->pager_initialized) { - - /* - * If there is no memory object for the page, create - * one and hand it to the default pager. - */ - - if (!object->pager_initialized) - vm_object_collapse(object, - (vm_object_offset_t) 0, - TRUE); - if (!object->pager_initialized) - vm_object_pager_create(object); - if (!object->pager_initialized) { - /* - * Still no pager for the object. - * Reactivate the page. - * - * Should only happen if there is no - * default pager. - */ - vm_page_lockspin_queues(); - - vm_pageout_queue_steal(m, TRUE); - vm_pageout_dirty_no_pager++; - vm_page_activate(m); - - vm_page_unlock_queues(); - - /* - * And we are done with it. - */ - PAGE_WAKEUP_DONE(m); - - vm_object_paging_end(object); - vm_object_unlock(object); - - vm_page_lockspin_queues(); - continue; - } - } - pager = object->pager; - if (pager == MEMORY_OBJECT_NULL) { - /* - * This pager has been destroyed by either - * memory_object_destroy or vm_object_destroy, and - * so there is nowhere for the page to go. - * Just free the page... VM_PAGE_FREE takes - * care of cleaning up all the state... - * including doing the vm_pageout_throttle_up - */ - - VM_PAGE_FREE(m); - - vm_object_paging_end(object); - vm_object_unlock(object); - - vm_page_lockspin_queues(); - continue; - } - VM_PAGE_CHECK(m); - vm_object_unlock(object); - /* - * we expect the paging_in_progress reference to have - * already been taken on the object before it was added - * to the appropriate pageout I/O queue... this will - * keep the object from being terminated and/or the - * paging_offset from changing until the I/O has - * completed... therefore no need to lock the object to - * pull the paging_offset from it. - * - * Send the data to the pager. - * any pageout clustering happens there - */ - memory_object_data_return(pager, - m->offset + object->paging_offset, - PAGE_SIZE, - NULL, - NULL, - FALSE, - FALSE, - 0); - - vm_object_lock(object); - vm_object_paging_end(object); - vm_object_unlock(object); - - vm_page_lockspin_queues(); - } - assert_wait((event_t) q, THREAD_UNINT); - - - if (q->pgo_throttled == TRUE && !VM_PAGE_Q_THROTTLED(q)) { - q->pgo_throttled = FALSE; - need_wakeup = TRUE; - } else - need_wakeup = FALSE; + tmp = vm_pageout_vminfo.vm_pageout_reactivation_limit_exceeded; + vm_pageout_stats[vm_pageout_stat_now].reactivation_limit_exceeded = (unsigned int)(tmp - last.vm_pageout_reactivation_limit_exceeded); + last.vm_pageout_reactivation_limit_exceeded = tmp; - q->pgo_busy = FALSE; - q->pgo_idle = TRUE; - vm_page_unlock_queues(); + tmp = vm_pageout_vminfo.vm_pageout_inactive_force_reclaim; + vm_pageout_stats[vm_pageout_stat_now].forced_inactive_reclaim = (unsigned int)(tmp - last.vm_pageout_inactive_force_reclaim); + last.vm_pageout_inactive_force_reclaim = tmp; - if (need_wakeup == TRUE) - thread_wakeup((event_t) &q->pgo_laundry); + tmp = vm_pageout_vminfo.vm_pageout_freed_internal; + vm_pageout_stats[vm_pageout_stat_now].freed_internal = (unsigned int)(tmp - last.vm_pageout_freed_internal); + last.vm_pageout_freed_internal = tmp; - thread_block_parameter((thread_continue_t)vm_pageout_iothread_continue, (void *) &q->pgo_pending); - /*NOTREACHED*/ -} + tmp = vm_pageout_vminfo.vm_pageout_considered_bq_internal; + vm_pageout_stats[vm_pageout_stat_now].considered_bq_internal = (unsigned int)(tmp - last.vm_pageout_considered_bq_internal); + last.vm_pageout_considered_bq_internal = tmp; + tmp = vm_pageout_vminfo.vm_pageout_considered_bq_external; + vm_pageout_stats[vm_pageout_stat_now].considered_bq_external = (unsigned int)(tmp - last.vm_pageout_considered_bq_external); + last.vm_pageout_considered_bq_external = tmp; -static void -vm_pageout_iothread_external(void) -{ - thread_t self = current_thread(); + tmp = vm_pageout_vminfo.vm_pageout_filecache_min_reactivated; + vm_pageout_stats[vm_pageout_stat_now].filecache_min_reactivations = (unsigned int)(tmp - last.vm_pageout_filecache_min_reactivated); + last.vm_pageout_filecache_min_reactivated = tmp; - self->options |= TH_OPT_VMPRIV; + tmp = vm_pageout_vminfo.vm_pageout_inactive_dirty_internal; + vm_pageout_stats[vm_pageout_stat_now].cleaned_dirty_internal = (unsigned int)(tmp - last.vm_pageout_inactive_dirty_internal); + last.vm_pageout_inactive_dirty_internal = tmp; + } - vm_pageout_iothread_continue(&vm_pageout_queue_external); - /*NOTREACHED*/ + KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, VM_INFO1)) | DBG_FUNC_NONE, + vm_pageout_stats[vm_pageout_stat_now].vm_page_active_count, + vm_pageout_stats[vm_pageout_stat_now].vm_page_speculative_count, + vm_pageout_stats[vm_pageout_stat_now].vm_page_inactive_count, + vm_pageout_stats[vm_pageout_stat_now].vm_page_anonymous_count, + 0); + + KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, VM_INFO2)) | DBG_FUNC_NONE, + vm_pageout_stats[vm_pageout_stat_now].vm_page_free_count, + vm_pageout_stats[vm_pageout_stat_now].vm_page_wire_count, + vm_pageout_stats[vm_pageout_stat_now].vm_page_compressor_count, + 0, + 0); + + KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, VM_INFO3)) | DBG_FUNC_NONE, + vm_pageout_stats[vm_pageout_stat_now].vm_page_pages_compressed, + vm_pageout_stats[vm_pageout_stat_now].vm_page_pageable_internal_count, + vm_pageout_stats[vm_pageout_stat_now].vm_page_pageable_external_count, + vm_pageout_stats[vm_pageout_stat_now].vm_page_xpmapped_external_count, + 0); + + if (vm_pageout_stats[vm_pageout_stat_now].considered || + vm_pageout_stats[vm_pageout_stat_now].pages_compressed || + vm_pageout_stats[vm_pageout_stat_now].failed_compressions) { + KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, VM_INFO4)) | DBG_FUNC_NONE, + vm_pageout_stats[vm_pageout_stat_now].considered, + vm_pageout_stats[vm_pageout_stat_now].freed_speculative, + vm_pageout_stats[vm_pageout_stat_now].freed_external, + vm_pageout_stats[vm_pageout_stat_now].inactive_referenced, + 0); + + KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, VM_INFO5)) | DBG_FUNC_NONE, + vm_pageout_stats[vm_pageout_stat_now].throttled_external_q, + vm_pageout_stats[vm_pageout_stat_now].cleaned_dirty_external, + vm_pageout_stats[vm_pageout_stat_now].freed_cleaned, + vm_pageout_stats[vm_pageout_stat_now].inactive_nolock, + 0); + + KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, VM_INFO6)) | DBG_FUNC_NONE, + vm_pageout_stats[vm_pageout_stat_now].throttled_internal_q, + vm_pageout_stats[vm_pageout_stat_now].pages_compressed, + vm_pageout_stats[vm_pageout_stat_now].pages_grabbed_by_compressor, + vm_pageout_stats[vm_pageout_stat_now].skipped_external, + 0); + + KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, VM_INFO7)) | DBG_FUNC_NONE, + vm_pageout_stats[vm_pageout_stat_now].reactivation_limit_exceeded, + vm_pageout_stats[vm_pageout_stat_now].forced_inactive_reclaim, + vm_pageout_stats[vm_pageout_stat_now].failed_compressions, + vm_pageout_stats[vm_pageout_stat_now].freed_internal, + 0); + + KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, VM_INFO8)) | DBG_FUNC_NONE, + vm_pageout_stats[vm_pageout_stat_now].considered_bq_internal, + vm_pageout_stats[vm_pageout_stat_now].considered_bq_external, + vm_pageout_stats[vm_pageout_stat_now].filecache_min_reactivations, + vm_pageout_stats[vm_pageout_stat_now].cleaned_dirty_internal, + 0); + } + KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, VM_INFO9)) | DBG_FUNC_NONE, + vm_pageout_stats[vm_pageout_stat_now].pages_grabbed, + vm_pageout_stats[vm_pageout_stat_now].pages_freed, + vm_pageout_stats[vm_pageout_stat_now].phantom_ghosts_found, + vm_pageout_stats[vm_pageout_stat_now].phantom_ghosts_added, + 0); + + record_memory_pressure(); } +extern boolean_t hibernation_vmqueues_inspection; -static void -vm_pageout_iothread_internal(void) -{ - thread_t self = current_thread(); - - self->options |= TH_OPT_VMPRIV; - - vm_pageout_iothread_continue(&vm_pageout_queue_internal); - /*NOTREACHED*/ -} +/* + * Return values for functions called by vm_pageout_scan + * that control its flow. + * + * PROCEED -- vm_pageout_scan will keep making forward progress. + * DONE_RETURN -- page demand satisfied, work is done -> vm_pageout_scan returns. + * NEXT_ITERATION -- restart the 'for' loop in vm_pageout_scan aka continue. + */ -kern_return_t -vm_set_buffer_cleanup_callout(boolean_t (*func)(void)) -{ - if (OSCompareAndSwapPtr(NULL, func, (void * volatile *) &consider_buffer_cache_collect)) { - return KERN_SUCCESS; - } else { - return KERN_FAILURE; /* Already set */ - } -} +#define VM_PAGEOUT_SCAN_PROCEED (0) +#define VM_PAGEOUT_SCAN_DONE_RETURN (1) +#define VM_PAGEOUT_SCAN_NEXT_ITERATION (2) +/* + * This function is called only from vm_pageout_scan and + * it moves overflow secluded pages (one-at-a-time) to the + * batched 'local' free Q or active Q. + */ static void -vm_pageout_garbage_collect(int collect) +vps_deal_with_secluded_page_overflow(vm_page_t *local_freeq, int *local_freed) { - if (collect) { - boolean_t buf_large_zfree = FALSE; - stack_collect(); +#if CONFIG_SECLUDED_MEMORY + /* + * Deal with secluded_q overflow. + */ + if (vm_page_secluded_count > vm_page_secluded_target) { + vm_page_t secluded_page; /* - * consider_zone_gc should be last, because the other operations - * might return memory to zones. + * SECLUDED_AGING_BEFORE_ACTIVE: + * Excess secluded pages go to the active queue and + * will later go to the inactive queue. */ - consider_machine_collect(); - if (consider_buffer_cache_collect != NULL) { - buf_large_zfree = (*consider_buffer_cache_collect)(); + assert((vm_page_secluded_count_free + + vm_page_secluded_count_inuse) == + vm_page_secluded_count); + secluded_page = (vm_page_t)vm_page_queue_first(&vm_page_queue_secluded); + assert(secluded_page->vmp_q_state == VM_PAGE_ON_SECLUDED_Q); + + vm_page_queues_remove(secluded_page, FALSE); + assert(!secluded_page->vmp_fictitious); + assert(!VM_PAGE_WIRED(secluded_page)); + + if (secluded_page->vmp_object == 0) { + /* transfer to free queue */ + assert(secluded_page->vmp_busy); + secluded_page->vmp_snext = *local_freeq; + *local_freeq = secluded_page; + *local_freed += 1; + } else { + /* transfer to head of active queue */ + vm_page_enqueue_active(secluded_page, FALSE); + secluded_page = VM_PAGE_NULL; } - consider_zone_gc(buf_large_zfree); - - consider_machine_adjust(); } +#else /* CONFIG_SECLUDED_MEMORY */ - assert_wait((event_t) &vm_pageout_garbage_collect, THREAD_UNINT); - - thread_block_parameter((thread_continue_t) vm_pageout_garbage_collect, (void *)1); - /*NOTREACHED*/ -} +#pragma unused(local_freeq) +#pragma unused(local_freed) + return; +#endif /* CONFIG_SECLUDED_MEMORY */ +} -void -vm_pageout(void) +/* + * This function is called only from vm_pageout_scan and + * it initializes the loop targets for vm_pageout_scan(). + */ +static void +vps_init_page_targets(void) { - thread_t self = current_thread(); - thread_t thread; - kern_return_t result; - spl_t s; - /* - * Set thread privileges. + * LD TODO: Other page targets should be calculated here too. */ - s = splsched(); - thread_lock(self); - self->priority = BASEPRI_PREEMPT - 1; - set_sched_pri(self, self->priority); - thread_unlock(self); + vm_page_anonymous_min = vm_page_inactive_target / 20; - if (!self->reserved_stack) - self->reserved_stack = self->kernel_stack; + if (vm_pageout_state.vm_page_speculative_percentage > 50) { + vm_pageout_state.vm_page_speculative_percentage = 50; + } else if (vm_pageout_state.vm_page_speculative_percentage <= 0) { + vm_pageout_state.vm_page_speculative_percentage = 1; + } - splx(s); + vm_pageout_state.vm_page_speculative_target = VM_PAGE_SPECULATIVE_TARGET(vm_page_active_count + + vm_page_inactive_count); +} - /* - * Initialize some paging parameters. - */ +/* + * This function is called only from vm_pageout_scan and + * it purges a single VM object at-a-time and will either + * make vm_pageout_scan() restart the loop or keeping moving forward. + */ +static int +vps_purge_object() +{ + int force_purge; - if (vm_pageout_idle_wait == 0) - vm_pageout_idle_wait = VM_PAGEOUT_IDLE_WAIT; + assert(available_for_purge >= 0); + force_purge = 0; /* no force-purging */ - if (vm_pageout_burst_wait == 0) - vm_pageout_burst_wait = VM_PAGEOUT_BURST_WAIT; +#if VM_PRESSURE_EVENTS + vm_pressure_level_t pressure_level; - if (vm_pageout_empty_wait == 0) - vm_pageout_empty_wait = VM_PAGEOUT_EMPTY_WAIT; + pressure_level = memorystatus_vm_pressure_level; - if (vm_pageout_deadlock_wait == 0) - vm_pageout_deadlock_wait = VM_PAGEOUT_DEADLOCK_WAIT; + if (pressure_level > kVMPressureNormal) { + if (pressure_level >= kVMPressureCritical) { + force_purge = vm_pageout_state.memorystatus_purge_on_critical; + } else if (pressure_level >= kVMPressureUrgent) { + force_purge = vm_pageout_state.memorystatus_purge_on_urgent; + } else if (pressure_level >= kVMPressureWarning) { + force_purge = vm_pageout_state.memorystatus_purge_on_warning; + } + } +#endif /* VM_PRESSURE_EVENTS */ - if (vm_pageout_deadlock_relief == 0) - vm_pageout_deadlock_relief = VM_PAGEOUT_DEADLOCK_RELIEF; + if (available_for_purge || force_purge) { + memoryshot(VM_PAGEOUT_PURGEONE, DBG_FUNC_START); - if (vm_pageout_inactive_relief == 0) - vm_pageout_inactive_relief = VM_PAGEOUT_INACTIVE_RELIEF; + VM_DEBUG_EVENT(vm_pageout_purgeone, VM_PAGEOUT_PURGEONE, DBG_FUNC_START, vm_page_free_count, 0, 0, 0); + if (vm_purgeable_object_purge_one(force_purge, C_DONT_BLOCK)) { + VM_PAGEOUT_DEBUG(vm_pageout_purged_objects, 1); + VM_DEBUG_EVENT(vm_pageout_purgeone, VM_PAGEOUT_PURGEONE, DBG_FUNC_END, vm_page_free_count, 0, 0, 0); + memoryshot(VM_PAGEOUT_PURGEONE, DBG_FUNC_END); - if (vm_pageout_burst_active_throttle == 0) - vm_pageout_burst_active_throttle = VM_PAGEOUT_BURST_ACTIVE_THROTTLE; + return VM_PAGEOUT_SCAN_NEXT_ITERATION; + } + VM_DEBUG_EVENT(vm_pageout_purgeone, VM_PAGEOUT_PURGEONE, DBG_FUNC_END, 0, 0, 0, -1); + memoryshot(VM_PAGEOUT_PURGEONE, DBG_FUNC_END); + } - if (vm_pageout_burst_inactive_throttle == 0) - vm_pageout_burst_inactive_throttle = VM_PAGEOUT_BURST_INACTIVE_THROTTLE; + return VM_PAGEOUT_SCAN_PROCEED; +} - /* - * Set kernel task to low backing store privileged - * status - */ - task_lock(kernel_task); - kernel_task->priv_flags |= VM_BACKING_STORE_PRIV; - task_unlock(kernel_task); - - vm_page_free_count_init = vm_page_free_count; +/* + * This function is called only from vm_pageout_scan and + * it will try to age the next speculative Q if the oldest + * one is empty. + */ +static int +vps_age_speculative_queue(boolean_t force_speculative_aging) +{ +#define DELAY_SPECULATIVE_AGE 1000 /* - * even if we've already called vm_page_free_reserve - * call it again here to insure that the targets are - * accurately calculated (it uses vm_page_free_count_init) - * calling it with an arg of 0 will not change the reserve - * but will re-calculate free_min and free_target + * try to pull pages from the aging bins... + * see vm_page.h for an explanation of how + * this mechanism works */ - if (vm_page_free_reserved < VM_PAGE_FREE_RESERVED(processor_count)) { - vm_page_free_reserve((VM_PAGE_FREE_RESERVED(processor_count)) - vm_page_free_reserved); - } else - vm_page_free_reserve(0); - - - queue_init(&vm_pageout_queue_external.pgo_pending); - vm_pageout_queue_external.pgo_maxlaundry = VM_PAGE_LAUNDRY_MAX; - vm_pageout_queue_external.pgo_laundry = 0; - vm_pageout_queue_external.pgo_idle = FALSE; - vm_pageout_queue_external.pgo_busy = FALSE; - vm_pageout_queue_external.pgo_throttled = FALSE; - - queue_init(&vm_pageout_queue_internal.pgo_pending); - vm_pageout_queue_internal.pgo_maxlaundry = 0; - vm_pageout_queue_internal.pgo_laundry = 0; - vm_pageout_queue_internal.pgo_idle = FALSE; - vm_pageout_queue_internal.pgo_busy = FALSE; - vm_pageout_queue_internal.pgo_throttled = FALSE; - + boolean_t can_steal = FALSE; + int num_scanned_queues; + static int delay_speculative_age = 0; /* depends the # of times we go through the main pageout_scan loop.*/ + mach_timespec_t ts; + struct vm_speculative_age_q *aq; + struct vm_speculative_age_q *sq; - /* internal pageout thread started when default pager registered first time */ - /* external pageout and garbage collection threads started here */ + sq = &vm_page_queue_speculative[VM_PAGE_SPECULATIVE_AGED_Q]; - result = kernel_thread_start_priority((thread_continue_t)vm_pageout_iothread_external, NULL, - BASEPRI_PREEMPT - 1, - &vm_pageout_external_iothread); - if (result != KERN_SUCCESS) - panic("vm_pageout_iothread_external: create failed"); + aq = &vm_page_queue_speculative[speculative_steal_index]; - thread_deallocate(vm_pageout_external_iothread); + num_scanned_queues = 0; + while (vm_page_queue_empty(&aq->age_q) && + num_scanned_queues++ != VM_PAGE_MAX_SPECULATIVE_AGE_Q) { + speculative_steal_index++; - result = kernel_thread_start_priority((thread_continue_t)vm_pageout_garbage_collect, NULL, - MINPRI_KERNEL, - &thread); - if (result != KERN_SUCCESS) - panic("vm_pageout_garbage_collect: create failed"); + if (speculative_steal_index > VM_PAGE_MAX_SPECULATIVE_AGE_Q) { + speculative_steal_index = VM_PAGE_MIN_SPECULATIVE_AGE_Q; + } - thread_deallocate(thread); + aq = &vm_page_queue_speculative[speculative_steal_index]; + } - vm_object_reaper_init(); + if (num_scanned_queues == VM_PAGE_MAX_SPECULATIVE_AGE_Q + 1) { + /* + * XXX We've scanned all the speculative + * queues but still haven't found one + * that is not empty, even though + * vm_page_speculative_count is not 0. + */ + if (!vm_page_queue_empty(&sq->age_q)) { + return VM_PAGEOUT_SCAN_NEXT_ITERATION; + } +#if DEVELOPMENT || DEBUG + panic("vm_pageout_scan: vm_page_speculative_count=%d but queues are empty", vm_page_speculative_count); +#endif + /* readjust... */ + vm_page_speculative_count = 0; + /* ... and continue */ + return VM_PAGEOUT_SCAN_NEXT_ITERATION; + } + if (vm_page_speculative_count > vm_pageout_state.vm_page_speculative_target || force_speculative_aging == TRUE) { + can_steal = TRUE; + } else { + if (!delay_speculative_age) { + mach_timespec_t ts_fully_aged; - vm_pageout_continue(); + ts_fully_aged.tv_sec = (VM_PAGE_MAX_SPECULATIVE_AGE_Q * vm_pageout_state.vm_page_speculative_q_age_ms) / 1000; + ts_fully_aged.tv_nsec = ((VM_PAGE_MAX_SPECULATIVE_AGE_Q * vm_pageout_state.vm_page_speculative_q_age_ms) % 1000) + * 1000 * NSEC_PER_USEC; - /* - * Unreached code! - * - * The vm_pageout_continue() call above never returns, so the code below is never - * executed. We take advantage of this to declare several DTrace VM related probe - * points that our kernel doesn't have an analog for. These are probe points that - * exist in Solaris and are in the DTrace documentation, so people may have written - * scripts that use them. Declaring the probe points here means their scripts will - * compile and execute which we want for portability of the scripts, but since this - * section of code is never reached, the probe points will simply never fire. Yes, - * this is basically a hack. The problem is the DTrace probe points were chosen with - * Solaris specific VM events in mind, not portability to different VM implementations. - */ + ADD_MACH_TIMESPEC(&ts_fully_aged, &aq->age_ts); - DTRACE_VM2(execfree, int, 1, (uint64_t *), NULL); - DTRACE_VM2(execpgin, int, 1, (uint64_t *), NULL); - DTRACE_VM2(execpgout, int, 1, (uint64_t *), NULL); - DTRACE_VM2(pgswapin, int, 1, (uint64_t *), NULL); - DTRACE_VM2(pgswapout, int, 1, (uint64_t *), NULL); - DTRACE_VM2(swapin, int, 1, (uint64_t *), NULL); - DTRACE_VM2(swapout, int, 1, (uint64_t *), NULL); - /*NOTREACHED*/ -} + clock_sec_t sec; + clock_nsec_t nsec; + clock_get_system_nanotime(&sec, &nsec); + ts.tv_sec = (unsigned int) sec; + ts.tv_nsec = nsec; -kern_return_t -vm_pageout_internal_start(void) -{ - kern_return_t result; + if (CMP_MACH_TIMESPEC(&ts, &ts_fully_aged) >= 0) { + can_steal = TRUE; + } else { + delay_speculative_age++; + } + } else { + delay_speculative_age++; + if (delay_speculative_age == DELAY_SPECULATIVE_AGE) { + delay_speculative_age = 0; + } + } + } + if (can_steal == TRUE) { + vm_page_speculate_ageit(aq); + } - vm_pageout_queue_internal.pgo_maxlaundry = VM_PAGE_LAUNDRY_MAX; - result = kernel_thread_start_priority((thread_continue_t)vm_pageout_iothread_internal, NULL, BASEPRI_PREEMPT - 1, &vm_pageout_internal_iothread); - if (result == KERN_SUCCESS) - thread_deallocate(vm_pageout_internal_iothread); - return result; + return VM_PAGEOUT_SCAN_PROCEED; } - /* - * when marshalling pages into a UPL and subsequently committing - * or aborting them, it is necessary to hold - * the vm_page_queue_lock (a hot global lock) for certain operations - * on the page... however, the majority of the work can be done - * while merely holding the object lock... in fact there are certain - * collections of pages that don't require any work brokered by the - * vm_page_queue_lock... to mitigate the time spent behind the global - * lock, go to a 2 pass algorithm... collect pages up to DELAYED_WORK_LIMIT - * while doing all of the work that doesn't require the vm_page_queue_lock... - * then call dw_do_work to acquire the vm_page_queue_lock and do the - * necessary work for each page... we will grab the busy bit on the page - * if it's not already held so that dw_do_work can drop the object lock - * if it can't immediately take the vm_page_queue_lock in order to compete - * for the locks in the same order that vm_pageout_scan takes them. - * the operation names are modeled after the names of the routines that - * need to be called in order to make the changes very obvious in the - * original loop + * This function is called only from vm_pageout_scan and + * it evicts a single VM object from the cache. */ +static int inline +vps_object_cache_evict(vm_object_t *object_to_unlock) +{ + static int cache_evict_throttle = 0; + struct vm_speculative_age_q *sq; -#define DELAYED_WORK_LIMIT 32 - -#define DW_vm_page_unwire 0x01 -#define DW_vm_page_wire 0x02 -#define DW_vm_page_free 0x04 -#define DW_vm_page_activate 0x08 -#define DW_vm_page_deactivate_internal 0x10 -#define DW_vm_page_speculate 0x20 -#define DW_vm_page_lru 0x40 -#define DW_vm_pageout_throttle_up 0x80 -#define DW_PAGE_WAKEUP 0x100 -#define DW_clear_busy 0x200 -#define DW_clear_reference 0x400 -#define DW_set_reference 0x800 - -struct dw { - vm_page_t dw_m; - int dw_mask; -}; - + sq = &vm_page_queue_speculative[VM_PAGE_SPECULATIVE_AGED_Q]; -static void dw_do_work(vm_object_t object, struct dw *dwp, int dw_count); + if (vm_page_queue_empty(&sq->age_q) && cache_evict_throttle == 0) { + int pages_evicted; + if (*object_to_unlock != NULL) { + vm_object_unlock(*object_to_unlock); + *object_to_unlock = NULL; + } + KERNEL_DEBUG_CONSTANT(0x13001ec | DBG_FUNC_START, 0, 0, 0, 0, 0); + pages_evicted = vm_object_cache_evict(100, 10); -static upl_t -upl_create(int type, int flags, upl_size_t size) -{ - upl_t upl; - int page_field_size = 0; - int upl_flags = 0; - int upl_size = sizeof(struct upl); + KERNEL_DEBUG_CONSTANT(0x13001ec | DBG_FUNC_END, pages_evicted, 0, 0, 0, 0); - size = round_page_32(size); + if (pages_evicted) { + vm_pageout_vminfo.vm_pageout_pages_evicted += pages_evicted; - if (type & UPL_CREATE_LITE) { - page_field_size = (atop(size) + 7) >> 3; - page_field_size = (page_field_size + 3) & 0xFFFFFFFC; + VM_DEBUG_EVENT(vm_pageout_cache_evict, VM_PAGEOUT_CACHE_EVICT, DBG_FUNC_NONE, + vm_page_free_count, pages_evicted, vm_pageout_vminfo.vm_pageout_pages_evicted, 0); + memoryshot(VM_PAGEOUT_CACHE_EVICT, DBG_FUNC_NONE); - upl_flags |= UPL_LITE; + /* + * we just freed up to 100 pages, + * so go back to the top of the main loop + * and re-evaulate the memory situation + */ + return VM_PAGEOUT_SCAN_NEXT_ITERATION; + } else { + cache_evict_throttle = 1000; + } } - if (type & UPL_CREATE_INTERNAL) { - upl_size += (int) sizeof(struct upl_page_info) * atop(size); - - upl_flags |= UPL_INTERNAL; + if (cache_evict_throttle) { + cache_evict_throttle--; } - upl = (upl_t)kalloc(upl_size + page_field_size); - - if (page_field_size) - bzero((char *)upl + upl_size, page_field_size); - - upl->flags = upl_flags | flags; - upl->src_object = NULL; - upl->kaddr = (vm_offset_t)0; - upl->size = 0; - upl->map_object = NULL; - upl->ref_count = 1; - upl->highest_page = 0; - upl_lock_init(upl); - upl->vector_upl = NULL; -#if UPL_DEBUG - upl->ubc_alias1 = 0; - upl->ubc_alias2 = 0; - - upl->upl_creator = current_thread(); - upl->upl_state = 0; - upl->upl_commit_index = 0; - bzero(&upl->upl_commit_records[0], sizeof(upl->upl_commit_records)); - - (void) OSBacktrace(&upl->upl_create_retaddr[0], UPL_DEBUG_STACK_FRAMES); -#endif /* UPL_DEBUG */ - return(upl); + return VM_PAGEOUT_SCAN_PROCEED; } + +/* + * This function is called only from vm_pageout_scan and + * it calculates the filecache min. that needs to be maintained + * as we start to steal pages. + */ static void -upl_destroy(upl_t upl) +vps_calculate_filecache_min(void) { - int page_field_size; /* bit field in word size buf */ - int size; + int divisor = vm_pageout_state.vm_page_filecache_min_divisor; -#if UPL_DEBUG - { - vm_object_t object; - - if (upl->flags & UPL_SHADOWED) { - object = upl->map_object->shadow; - } else { - object = upl->map_object; - } - vm_object_lock(object); - queue_remove(&object->uplq, upl, upl_t, uplq); - vm_object_unlock(object); - } -#endif /* UPL_DEBUG */ +#if CONFIG_JETSAM /* - * drop a reference on the map_object whether or - * not a pageout object is inserted + * don't let the filecache_min fall below 15% of available memory + * on systems with an active compressor that isn't nearing its + * limits w/r to accepting new data + * + * on systems w/o the compressor/swapper, the filecache is always + * a very large percentage of the AVAILABLE_NON_COMPRESSED_MEMORY + * since most (if not all) of the anonymous pages are in the + * throttled queue (which isn't counted as available) which + * effectively disables this filter */ - if (upl->flags & UPL_SHADOWED) - vm_object_deallocate(upl->map_object); - - if (upl->flags & UPL_DEVICE_MEMORY) - size = PAGE_SIZE; - else - size = upl->size; - page_field_size = 0; - - if (upl->flags & UPL_LITE) { - page_field_size = ((size/PAGE_SIZE) + 7) >> 3; - page_field_size = (page_field_size + 3) & 0xFFFFFFFC; + if (vm_compressor_low_on_space() || divisor == 0) { + vm_pageout_state.vm_page_filecache_min = 0; + } else { + vm_pageout_state.vm_page_filecache_min = + ((AVAILABLE_NON_COMPRESSED_MEMORY) * 10) / divisor; } - upl_lock_destroy(upl); - upl->vector_upl = (vector_upl_t) 0xfeedbeef; - if (upl->flags & UPL_INTERNAL) { - kfree(upl, - sizeof(struct upl) + - (sizeof(struct upl_page_info) * (size/PAGE_SIZE)) - + page_field_size); +#else + if (vm_compressor_out_of_space() || divisor == 0) { + vm_pageout_state.vm_page_filecache_min = 0; } else { - kfree(upl, sizeof(struct upl) + page_field_size); + /* + * don't let the filecache_min fall below the specified critical level + */ + vm_pageout_state.vm_page_filecache_min = + ((AVAILABLE_NON_COMPRESSED_MEMORY) * 10) / divisor; + } +#endif + if (vm_page_free_count < (vm_page_free_reserved / 4)) { + vm_pageout_state.vm_page_filecache_min = 0; } } -void uc_upl_dealloc(upl_t upl); -__private_extern__ void -uc_upl_dealloc(upl_t upl) +/* + * This function is called only from vm_pageout_scan and + * it updates the flow control time to detect if VM pageoutscan + * isn't making progress. + */ +static void +vps_flow_control_reset_deadlock_timer(struct flow_control *flow_control) { - if (--upl->ref_count == 0) - upl_destroy(upl); -} + mach_timespec_t ts; + clock_sec_t sec; + clock_nsec_t nsec; -void -upl_deallocate(upl_t upl) -{ - if (--upl->ref_count == 0) { - if(vector_upl_is_valid(upl)) - vector_upl_deallocate(upl); - upl_destroy(upl); - } -} + ts.tv_sec = vm_pageout_state.vm_pageout_deadlock_wait / 1000; + ts.tv_nsec = (vm_pageout_state.vm_pageout_deadlock_wait % 1000) * 1000 * NSEC_PER_USEC; + clock_get_system_nanotime(&sec, &nsec); + flow_control->ts.tv_sec = (unsigned int) sec; + flow_control->ts.tv_nsec = nsec; + ADD_MACH_TIMESPEC(&flow_control->ts, &ts); -#if DEVELOPMENT || DEBUG -/*/* - * Statistics about UPL enforcement of copy-on-write obligations. - */ -unsigned long upl_cow = 0; -unsigned long upl_cow_again = 0; -unsigned long upl_cow_pages = 0; -unsigned long upl_cow_again_pages = 0; + flow_control->state = FCS_DELAYED; -unsigned long iopl_cow = 0; -unsigned long iopl_cow_pages = 0; -#endif + vm_pageout_vminfo.vm_pageout_scan_inactive_throttled_internal++; +} -/* - * Routine: vm_object_upl_request - * Purpose: - * Cause the population of a portion of a vm_object. - * Depending on the nature of the request, the pages - * returned may be contain valid data or be uninitialized. - * A page list structure, listing the physical pages - * will be returned upon request. - * This function is called by the file system or any other - * supplier of backing store to a pager. - * IMPORTANT NOTE: The caller must still respect the relationship - * between the vm_object and its backing memory object. The - * caller MUST NOT substitute changes in the backing file - * without first doing a memory_object_lock_request on the - * target range unless it is know that the pages are not - * shared with another entity at the pager level. - * Copy_in_to: - * if a page list structure is present - * return the mapped physical pages, where a - * page is not present, return a non-initialized - * one. If the no_sync bit is turned on, don't - * call the pager unlock to synchronize with other - * possible copies of the page. Leave pages busy - * in the original object, if a page list structure - * was specified. When a commit of the page list - * pages is done, the dirty bit will be set for each one. - * Copy_out_from: - * If a page list structure is present, return - * all mapped pages. Where a page does not exist - * map a zero filled one. Leave pages busy in - * the original object. If a page list structure - * is not specified, this call is a no-op. - * - * Note: access of default pager objects has a rather interesting - * twist. The caller of this routine, presumably the file system - * page cache handling code, will never actually make a request - * against a default pager backed object. Only the default - * pager will make requests on backing store related vm_objects - * In this way the default pager can maintain the relationship - * between backing store files (abstract memory objects) and - * the vm_objects (cache objects), they support. - * +/* + * This function is called only from vm_pageout_scan and + * it is the flow control logic of VM pageout scan which + * controls if it should block and for how long. + * Any blocking of vm_pageout_scan happens ONLY in this function. */ - -__private_extern__ kern_return_t -vm_object_upl_request( - vm_object_t object, - vm_object_offset_t offset, - upl_size_t size, - upl_t *upl_ptr, - upl_page_info_array_t user_page_list, - unsigned int *page_list_count, - int cntrl_flags) +static int +vps_flow_control(struct flow_control *flow_control, int *anons_grabbed, vm_object_t *object, int *delayed_unlock, + vm_page_t *local_freeq, int *local_freed, int *vm_pageout_deadlock_target, unsigned int inactive_burst_count) { - vm_page_t dst_page = VM_PAGE_NULL; - vm_object_offset_t dst_offset; - upl_size_t xfer_size; - boolean_t dirty; - boolean_t hw_dirty; - upl_t upl = NULL; - unsigned int entry; -#if MACH_CLUSTER_STATS - boolean_t encountered_lrp = FALSE; -#endif - vm_page_t alias_page = NULL; - int refmod_state = 0; - wpl_array_t lite_list = NULL; - vm_object_t last_copy_object; - struct dw dw_array[DELAYED_WORK_LIMIT]; - struct dw *dwp; - int dw_count; + boolean_t exceeded_burst_throttle = FALSE; + unsigned int msecs = 0; + uint32_t inactive_external_count; + mach_timespec_t ts; + struct vm_pageout_queue *iq; + struct vm_pageout_queue *eq; + struct vm_speculative_age_q *sq; - if (cntrl_flags & ~UPL_VALID_FLAGS) { - /* - * For forward compatibility's sake, - * reject any unknown flag. - */ - return KERN_INVALID_VALUE; - } - if ( (!object->internal) && (object->paging_offset != 0) ) - panic("vm_object_upl_request: external object with non-zero paging offset\n"); - if (object->phys_contiguous) - panic("vm_object_upl_request: contiguous object specified\n"); + iq = &vm_pageout_queue_internal; + eq = &vm_pageout_queue_external; + sq = &vm_page_queue_speculative[VM_PAGE_SPECULATIVE_AGED_Q]; + /* + * Sometimes we have to pause: + * 1) No inactive pages - nothing to do. + * 2) Loop control - no acceptable pages found on the inactive queue + * within the last vm_pageout_burst_inactive_throttle iterations + * 3) Flow control - default pageout queue is full + */ + if (vm_page_queue_empty(&vm_page_queue_inactive) && + vm_page_queue_empty(&vm_page_queue_anonymous) && + vm_page_queue_empty(&vm_page_queue_cleaned) && + vm_page_queue_empty(&sq->age_q)) { + VM_PAGEOUT_DEBUG(vm_pageout_scan_empty_throttle, 1); + msecs = vm_pageout_state.vm_pageout_empty_wait; + } else if (inactive_burst_count >= + MIN(vm_pageout_state.vm_pageout_burst_inactive_throttle, + (vm_page_inactive_count + + vm_page_speculative_count))) { + VM_PAGEOUT_DEBUG(vm_pageout_scan_burst_throttle, 1); + msecs = vm_pageout_state.vm_pageout_burst_wait; + + exceeded_burst_throttle = TRUE; + } else if (VM_PAGE_Q_THROTTLED(iq) && + VM_DYNAMIC_PAGING_ENABLED()) { + clock_sec_t sec; + clock_nsec_t nsec; + + switch (flow_control->state) { + case FCS_IDLE: + if ((vm_page_free_count + *local_freed) < vm_page_free_target && + vm_pageout_state.vm_restricted_to_single_processor == FALSE) { + /* + * since the compressor is running independently of vm_pageout_scan + * let's not wait for it just yet... as long as we have a healthy supply + * of filecache pages to work with, let's keep stealing those. + */ + inactive_external_count = vm_page_inactive_count - vm_page_anonymous_count; - if ((size / PAGE_SIZE) > MAX_UPL_SIZE) - size = MAX_UPL_SIZE * PAGE_SIZE; + if (vm_page_pageable_external_count > vm_pageout_state.vm_page_filecache_min && + (inactive_external_count >= VM_PAGE_INACTIVE_TARGET(vm_page_pageable_external_count))) { + *anons_grabbed = ANONS_GRABBED_LIMIT; + VM_PAGEOUT_DEBUG(vm_pageout_scan_throttle_deferred, 1); + return VM_PAGEOUT_SCAN_PROCEED; + } + } - if ( (cntrl_flags & UPL_SET_INTERNAL) && page_list_count != NULL) - *page_list_count = MAX_UPL_SIZE; + vps_flow_control_reset_deadlock_timer(flow_control); + msecs = vm_pageout_state.vm_pageout_deadlock_wait; - if (cntrl_flags & UPL_SET_INTERNAL) { - if (cntrl_flags & UPL_SET_LITE) { + break; - upl = upl_create(UPL_CREATE_INTERNAL | UPL_CREATE_LITE, 0, size); + case FCS_DELAYED: + clock_get_system_nanotime(&sec, &nsec); + ts.tv_sec = (unsigned int) sec; + ts.tv_nsec = nsec; - user_page_list = (upl_page_info_t *) (((uintptr_t)upl) + sizeof(struct upl)); - lite_list = (wpl_array_t) - (((uintptr_t)user_page_list) + - ((size/PAGE_SIZE) * sizeof(upl_page_info_t))); - if (size == 0) { - user_page_list = NULL; - lite_list = NULL; + if (CMP_MACH_TIMESPEC(&ts, &flow_control->ts) >= 0) { + /* + * the pageout thread for the default pager is potentially + * deadlocked since the + * default pager queue has been throttled for more than the + * allowable time... we need to move some clean pages or dirty + * pages belonging to the external pagers if they aren't throttled + * vm_page_free_wanted represents the number of threads currently + * blocked waiting for pages... we'll move one page for each of + * these plus a fixed amount to break the logjam... once we're done + * moving this number of pages, we'll re-enter the FSC_DELAYED state + * with a new timeout target since we have no way of knowing + * whether we've broken the deadlock except through observation + * of the queue associated with the default pager... we need to + * stop moving pages and allow the system to run to see what + * state it settles into. + */ + + *vm_pageout_deadlock_target = vm_pageout_state.vm_pageout_deadlock_relief + + vm_page_free_wanted + vm_page_free_wanted_privileged; + VM_PAGEOUT_DEBUG(vm_pageout_scan_deadlock_detected, 1); + flow_control->state = FCS_DEADLOCK_DETECTED; + thread_wakeup((event_t) &vm_pageout_garbage_collect); + return VM_PAGEOUT_SCAN_PROCEED; } - } else { - upl = upl_create(UPL_CREATE_INTERNAL, 0, size); + /* + * just resniff instead of trying + * to compute a new delay time... we're going to be + * awakened immediately upon a laundry completion, + * so we won't wait any longer than necessary + */ + msecs = vm_pageout_state.vm_pageout_idle_wait; + break; - user_page_list = (upl_page_info_t *) (((uintptr_t)upl) + sizeof(struct upl)); - if (size == 0) { - user_page_list = NULL; + case FCS_DEADLOCK_DETECTED: + if (*vm_pageout_deadlock_target) { + return VM_PAGEOUT_SCAN_PROCEED; } + + vps_flow_control_reset_deadlock_timer(flow_control); + msecs = vm_pageout_state.vm_pageout_deadlock_wait; + + break; } } else { - if (cntrl_flags & UPL_SET_LITE) { + /* + * No need to pause... + */ + return VM_PAGEOUT_SCAN_PROCEED; + } - upl = upl_create(UPL_CREATE_EXTERNAL | UPL_CREATE_LITE, 0, size); + vm_pageout_scan_wants_object = VM_OBJECT_NULL; - lite_list = (wpl_array_t) (((uintptr_t)upl) + sizeof(struct upl)); - if (size == 0) { - lite_list = NULL; - } - } else { - upl = upl_create(UPL_CREATE_EXTERNAL, 0, size); - } + vm_pageout_prepare_to_block(object, delayed_unlock, local_freeq, local_freed, + VM_PAGEOUT_PB_CONSIDER_WAKING_COMPACTOR_SWAPPER); + + if (vm_page_free_count >= vm_page_free_target) { + /* + * we're here because + * 1) someone else freed up some pages while we had + * the queues unlocked above + * and we've hit one of the 3 conditions that + * cause us to pause the pageout scan thread + * + * since we already have enough free pages, + * let's avoid stalling and return normally + * + * before we return, make sure the pageout I/O threads + * are running throttled in case there are still requests + * in the laundry... since we have enough free pages + * we don't need the laundry to be cleaned in a timely + * fashion... so let's avoid interfering with foreground + * activity + * + * we don't want to hold vm_page_queue_free_lock when + * calling vm_pageout_adjust_eq_iothrottle (since it + * may cause other locks to be taken), we do the intitial + * check outside of the lock. Once we take the lock, + * we recheck the condition since it may have changed. + * if it has, no problem, we will make the threads + * non-throttled before actually blocking + */ + vm_pageout_adjust_eq_iothrottle(eq, TRUE); } - *upl_ptr = upl; - - if (user_page_list) - user_page_list[0].device = FALSE; + lck_mtx_lock(&vm_page_queue_free_lock); - if (cntrl_flags & UPL_SET_LITE) { - upl->map_object = object; - } else { - upl->map_object = vm_object_allocate(size); + if (vm_page_free_count >= vm_page_free_target && + (vm_page_free_wanted == 0) && (vm_page_free_wanted_privileged == 0)) { + return VM_PAGEOUT_SCAN_DONE_RETURN; + } + lck_mtx_unlock(&vm_page_queue_free_lock); + + if ((vm_page_free_count + vm_page_cleaned_count) < vm_page_free_target) { /* - * No neeed to lock the new object: nobody else knows - * about it yet, so it's all ours so far. + * we're most likely about to block due to one of + * the 3 conditions that cause vm_pageout_scan to + * not be able to make forward progress w/r + * to providing new pages to the free queue, + * so unthrottle the I/O threads in case we + * have laundry to be cleaned... it needs + * to be completed ASAP. + * + * even if we don't block, we want the io threads + * running unthrottled since the sum of free + + * clean pages is still under our free target */ - upl->map_object->shadow = object; - upl->map_object->pageout = TRUE; - upl->map_object->can_persist = FALSE; - upl->map_object->copy_strategy = MEMORY_OBJECT_COPY_NONE; - upl->map_object->shadow_offset = offset; - upl->map_object->wimg_bits = object->wimg_bits; + vm_pageout_adjust_eq_iothrottle(eq, FALSE); + } + if (vm_page_cleaned_count > 0 && exceeded_burst_throttle == FALSE) { + /* + * if we get here we're below our free target and + * we're stalling due to a full laundry queue or + * we don't have any inactive pages other then + * those in the clean queue... + * however, we have pages on the clean queue that + * can be moved to the free queue, so let's not + * stall the pageout scan + */ + flow_control->state = FCS_IDLE; + return VM_PAGEOUT_SCAN_PROCEED; + } + if (flow_control->state == FCS_DELAYED && !VM_PAGE_Q_THROTTLED(iq)) { + flow_control->state = FCS_IDLE; + return VM_PAGEOUT_SCAN_PROCEED; + } - VM_PAGE_GRAB_FICTITIOUS(alias_page); + VM_CHECK_MEMORYSTATUS; - upl->flags |= UPL_SHADOWED; + if (flow_control->state != FCS_IDLE) { + VM_PAGEOUT_DEBUG(vm_pageout_scan_throttle, 1); } - /* - * ENCRYPTED SWAP: - * Just mark the UPL as "encrypted" here. - * We'll actually encrypt the pages later, - * in upl_encrypt(), when the caller has - * selected which pages need to go to swap. - */ - if (cntrl_flags & UPL_ENCRYPT) - upl->flags |= UPL_ENCRYPTED; - if (cntrl_flags & UPL_FOR_PAGEOUT) - upl->flags |= UPL_PAGEOUT; + iq->pgo_throttled = TRUE; + assert_wait_timeout((event_t) &iq->pgo_laundry, THREAD_INTERRUPTIBLE, msecs, 1000 * NSEC_PER_USEC); - vm_object_lock(object); - vm_object_activity_begin(object); + counter(c_vm_pageout_scan_block++); - /* - * we can lock in the paging_offset once paging_in_progress is set - */ - upl->size = size; - upl->offset = offset + object->paging_offset; + vm_page_unlock_queues(); -#if UPL_DEBUG - queue_enter(&object->uplq, upl, upl_t, uplq); -#endif /* UPL_DEBUG */ + assert(vm_pageout_scan_wants_object == VM_OBJECT_NULL); - if ((cntrl_flags & UPL_WILL_MODIFY) && object->copy != VM_OBJECT_NULL) { - /* - * Honor copy-on-write obligations - * - * The caller is gathering these pages and - * might modify their contents. We need to - * make sure that the copy object has its own - * private copies of these pages before we let - * the caller modify them. - */ - vm_object_update(object, - offset, - size, - NULL, - NULL, - FALSE, /* should_return */ - MEMORY_OBJECT_COPY_SYNC, - VM_PROT_NO_CHANGE); -#if DEVELOPMENT || DEBUG - upl_cow++; - upl_cow_pages += size >> PAGE_SHIFT; -#endif + VM_DEBUG_EVENT(vm_pageout_thread_block, VM_PAGEOUT_THREAD_BLOCK, DBG_FUNC_START, + iq->pgo_laundry, iq->pgo_maxlaundry, msecs, 0); + memoryshot(VM_PAGEOUT_THREAD_BLOCK, DBG_FUNC_START); + + thread_block(THREAD_CONTINUE_NULL); + + VM_DEBUG_EVENT(vm_pageout_thread_block, VM_PAGEOUT_THREAD_BLOCK, DBG_FUNC_END, + iq->pgo_laundry, iq->pgo_maxlaundry, msecs, 0); + memoryshot(VM_PAGEOUT_THREAD_BLOCK, DBG_FUNC_END); + + vm_page_lock_queues(); + + iq->pgo_throttled = FALSE; + + vps_init_page_targets(); + + return VM_PAGEOUT_SCAN_NEXT_ITERATION; +} + +/* + * This function is called only from vm_pageout_scan and + * it will find and return the most appropriate page to be + * reclaimed. + */ +static int +vps_choose_victim_page(vm_page_t *victim_page, int *anons_grabbed, boolean_t *grab_anonymous, boolean_t force_anonymous, + boolean_t *is_page_from_bg_q, unsigned int *reactivated_this_call) +{ + vm_page_t m = NULL; + vm_object_t m_object = VM_OBJECT_NULL; + uint32_t inactive_external_count; + struct vm_speculative_age_q *sq; + struct vm_pageout_queue *iq; + int retval = VM_PAGEOUT_SCAN_PROCEED; + + sq = &vm_page_queue_speculative[VM_PAGE_SPECULATIVE_AGED_Q]; + iq = &vm_pageout_queue_internal; + + *is_page_from_bg_q = FALSE; + + m = NULL; + m_object = VM_OBJECT_NULL; + + if (VM_DYNAMIC_PAGING_ENABLED()) { + assert(vm_page_throttled_count == 0); + assert(vm_page_queue_empty(&vm_page_queue_throttled)); } + /* - * remember which copy object we synchronized with + * Try for a clean-queue inactive page. + * These are pages that vm_pageout_scan tried to steal earlier, but + * were dirty and had to be cleaned. Pick them up now that they are clean. */ - last_copy_object = object->copy; - entry = 0; + if (!vm_page_queue_empty(&vm_page_queue_cleaned)) { + m = (vm_page_t) vm_page_queue_first(&vm_page_queue_cleaned); - xfer_size = size; - dst_offset = offset; + assert(m->vmp_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q); - dwp = &dw_array[0]; - dw_count = 0; + goto found_page; + } - while (xfer_size) { + /* + * The next most eligible pages are ones we paged in speculatively, + * but which have not yet been touched and have been aged out. + */ + if (!vm_page_queue_empty(&sq->age_q)) { + m = (vm_page_t) vm_page_queue_first(&sq->age_q); - dwp->dw_mask = 0; + assert(m->vmp_q_state == VM_PAGE_ON_SPECULATIVE_Q); - if ((alias_page == NULL) && !(cntrl_flags & UPL_SET_LITE)) { - vm_object_unlock(object); - VM_PAGE_GRAB_FICTITIOUS(alias_page); - vm_object_lock(object); + if (!m->vmp_dirty || force_anonymous == FALSE) { + goto found_page; + } else { + m = NULL; } - if (cntrl_flags & UPL_COPYOUT_FROM) { - upl->flags |= UPL_PAGE_SYNC_DONE; + } - if ( ((dst_page = vm_page_lookup(object, dst_offset)) == VM_PAGE_NULL) || - dst_page->fictitious || - dst_page->absent || - dst_page->error || - (VM_PAGE_WIRED(dst_page) && !dst_page->pageout && !dst_page->list_req_pending)) { +#if CONFIG_BACKGROUND_QUEUE + if (vm_page_background_mode != VM_PAGE_BG_DISABLED && (vm_page_background_count > vm_page_background_target)) { + vm_object_t bg_m_object = NULL; - if (user_page_list) - user_page_list[entry].phys_addr = 0; + m = (vm_page_t) vm_page_queue_first(&vm_page_queue_background); - goto try_next_page; - } + bg_m_object = VM_PAGE_OBJECT(m); + + if (!VM_PAGE_PAGEABLE(m)) { /* - * grab this up front... - * a high percentange of the time we're going to - * need the hardware modification state a bit later - * anyway... so we can eliminate an extra call into - * the pmap layer by grabbing it here and recording it + * This page is on the background queue + * but not on a pageable queue. This is + * likely a transient state and whoever + * took it out of its pageable queue + * will likely put it back on a pageable + * queue soon but we can't deal with it + * at this point, so let's ignore this + * page. */ - if (dst_page->pmapped) - refmod_state = pmap_get_refmod(dst_page->phys_page); - else - refmod_state = 0; + } else if (force_anonymous == FALSE || bg_m_object->internal) { + if (bg_m_object->internal && + (VM_PAGE_Q_THROTTLED(iq) || + vm_compressor_out_of_space() == TRUE || + vm_page_free_count < (vm_page_free_reserved / 4))) { + vm_pageout_skipped_bq_internal++; + } else { + *is_page_from_bg_q = TRUE; - if ( (refmod_state & VM_MEM_REFERENCED) && dst_page->inactive ) { - /* - * page is on inactive list and referenced... - * reactivate it now... this gets it out of the - * way of vm_pageout_scan which would have to - * reactivate it upon tripping over it - */ - dwp->dw_mask |= DW_vm_page_activate; - } - if (cntrl_flags & UPL_RET_ONLY_DIRTY) { - /* - * we're only asking for DIRTY pages to be returned - */ - if (dst_page->list_req_pending || !(cntrl_flags & UPL_FOR_PAGEOUT)) { - /* - * if we were the page stolen by vm_pageout_scan to be - * cleaned (as opposed to a buddy being clustered in - * or this request is not being driven by a PAGEOUT cluster - * then we only need to check for the page being dirty or - * precious to decide whether to return it - */ - if (dst_page->dirty || dst_page->precious || (refmod_state & VM_MEM_MODIFIED)) - goto check_busy; - goto dont_return; - } - /* - * this is a request for a PAGEOUT cluster and this page - * is merely along for the ride as a 'buddy'... not only - * does it have to be dirty to be returned, but it also - * can't have been referenced recently... note that we've - * already filtered above based on whether this page is - * currently on the inactive queue or it meets the page - * ticket (generation count) check - */ - if ( !(refmod_state & VM_MEM_REFERENCED) && - ((refmod_state & VM_MEM_MODIFIED) || dst_page->dirty || dst_page->precious) ) { - goto check_busy; + if (bg_m_object->internal) { + vm_pageout_vminfo.vm_pageout_considered_bq_internal++; + } else { + vm_pageout_vminfo.vm_pageout_considered_bq_external++; } -dont_return: - /* - * if we reach here, we're not to return - * the page... go on to the next one - */ - if (user_page_list) - user_page_list[entry].phys_addr = 0; - - goto try_next_page; + goto found_page; } -check_busy: - if (dst_page->busy && (!(dst_page->list_req_pending && dst_page->pageout))) { - if (cntrl_flags & UPL_NOBLOCK) { - if (user_page_list) - user_page_list[entry].phys_addr = 0; + } + } +#endif /* CONFIG_BACKGROUND_QUEUE */ - goto try_next_page; - } - /* - * someone else is playing with the - * page. We will have to wait. - */ - PAGE_SLEEP(object, dst_page, THREAD_UNINT); + inactive_external_count = vm_page_inactive_count - vm_page_anonymous_count; - continue; - } - /* - * Someone else already cleaning the page? - */ - if ((dst_page->cleaning || dst_page->absent || VM_PAGE_WIRED(dst_page)) && !dst_page->list_req_pending) { - if (user_page_list) - user_page_list[entry].phys_addr = 0; + if ((vm_page_pageable_external_count < vm_pageout_state.vm_page_filecache_min || force_anonymous == TRUE) || + (inactive_external_count < VM_PAGE_INACTIVE_TARGET(vm_page_pageable_external_count))) { + *grab_anonymous = TRUE; + *anons_grabbed = 0; - goto try_next_page; - } - /* - * ENCRYPTED SWAP: - * The caller is gathering this page and might - * access its contents later on. Decrypt the - * page before adding it to the UPL, so that - * the caller never sees encrypted data. - */ - if (! (cntrl_flags & UPL_ENCRYPT) && dst_page->encrypted) { - int was_busy; + vm_pageout_vminfo.vm_pageout_skipped_external++; + goto want_anonymous; + } + *grab_anonymous = (vm_page_anonymous_count > vm_page_anonymous_min); + +#if CONFIG_JETSAM + /* If the file-backed pool has accumulated + * significantly more pages than the jetsam + * threshold, prefer to reclaim those + * inline to minimise compute overhead of reclaiming + * anonymous pages. + * This calculation does not account for the CPU local + * external page queues, as those are expected to be + * much smaller relative to the global pools. + */ - /* - * save the current state of busy - * mark page as busy while decrypt - * is in progress since it will drop - * the object lock... - */ - was_busy = dst_page->busy; - dst_page->busy = TRUE; + struct vm_pageout_queue *eq = &vm_pageout_queue_external; - vm_page_decrypt(dst_page, 0); - vm_page_decrypt_for_upl_counter++; - /* - * restore to original busy state - */ - dst_page->busy = was_busy; + if (*grab_anonymous == TRUE && !VM_PAGE_Q_THROTTLED(eq)) { + if (vm_page_pageable_external_count > + vm_pageout_state.vm_page_filecache_min) { + if ((vm_page_pageable_external_count * + vm_pageout_memorystatus_fb_factor_dr) > + (memorystatus_available_pages_critical * + vm_pageout_memorystatus_fb_factor_nr)) { + *grab_anonymous = FALSE; + + VM_PAGEOUT_DEBUG(vm_grab_anon_overrides, 1); } - if (dst_page->pageout_queue == TRUE) { + } + if (*grab_anonymous) { + VM_PAGEOUT_DEBUG(vm_grab_anon_nops, 1); + } + } +#endif /* CONFIG_JETSAM */ - vm_page_lockspin_queues(); +want_anonymous: + if (*grab_anonymous == FALSE || *anons_grabbed >= ANONS_GRABBED_LIMIT || vm_page_queue_empty(&vm_page_queue_anonymous)) { + if (!vm_page_queue_empty(&vm_page_queue_inactive)) { + m = (vm_page_t) vm_page_queue_first(&vm_page_queue_inactive); + + assert(m->vmp_q_state == VM_PAGE_ON_INACTIVE_EXTERNAL_Q); + *anons_grabbed = 0; + + if (vm_page_pageable_external_count < vm_pageout_state.vm_page_filecache_min) { + if (!vm_page_queue_empty(&vm_page_queue_anonymous)) { + if ((++(*reactivated_this_call) % 100)) { + vm_pageout_vminfo.vm_pageout_filecache_min_reactivated++; + + vm_page_activate(m); + VM_STAT_INCR(reactivations); +#if CONFIG_BACKGROUND_QUEUE +#if DEVELOPMENT || DEBUG + if (*is_page_from_bg_q == TRUE) { + if (m_object->internal) { + vm_pageout_rejected_bq_internal++; + } else { + vm_pageout_rejected_bq_external++; + } + } +#endif /* DEVELOPMENT || DEBUG */ +#endif /* CONFIG_BACKGROUND_QUEUE */ + vm_pageout_state.vm_pageout_inactive_used++; + + m = NULL; + retval = VM_PAGEOUT_SCAN_NEXT_ITERATION; + + goto found_page; + } -#if CONFIG_EMBEDDED - if (dst_page->laundry) -#else - if (dst_page->pageout_queue == TRUE) -#endif - { /* - * we've buddied up a page for a clustered pageout - * that has already been moved to the pageout - * queue by pageout_scan... we need to remove - * it from the queue and drop the laundry count - * on that queue + * steal 1 of the file backed pages even if + * we are under the limit that has been set + * for a healthy filecache */ - vm_pageout_throttle_up(dst_page); } - vm_page_unlock_queues(); - } -#if MACH_CLUSTER_STATS - /* - * pageout statistics gathering. count - * all the pages we will page out that - * were not counted in the initial - * vm_pageout_scan work - */ - if (dst_page->list_req_pending) - encountered_lrp = TRUE; - if ((dst_page->dirty || (dst_page->object->internal && dst_page->precious)) && !dst_page->list_req_pending) { - if (encountered_lrp) - CLUSTER_STAT(pages_at_higher_offsets++;) - else - CLUSTER_STAT(pages_at_lower_offsets++;) } -#endif - /* - * Turn off busy indication on pending - * pageout. Note: we can only get here - * in the request pending case. - */ - dst_page->list_req_pending = FALSE; - dst_page->busy = FALSE; + goto found_page; + } + } + if (!vm_page_queue_empty(&vm_page_queue_anonymous)) { + m = (vm_page_t) vm_page_queue_first(&vm_page_queue_anonymous); - hw_dirty = refmod_state & VM_MEM_MODIFIED; - dirty = hw_dirty ? TRUE : dst_page->dirty; + assert(m->vmp_q_state == VM_PAGE_ON_INACTIVE_INTERNAL_Q); + *anons_grabbed += 1; - if (dst_page->phys_page > upl->highest_page) - upl->highest_page = dst_page->phys_page; + goto found_page; + } - if (cntrl_flags & UPL_SET_LITE) { - unsigned int pg_num; + m = NULL; - pg_num = (unsigned int) ((dst_offset-offset)/PAGE_SIZE); - assert(pg_num == (dst_offset-offset)/PAGE_SIZE); - lite_list[pg_num>>5] |= 1 << (pg_num & 31); +found_page: + *victim_page = m; - if (hw_dirty) - pmap_clear_modify(dst_page->phys_page); + return retval; +} - /* - * Mark original page as cleaning - * in place. - */ - dst_page->cleaning = TRUE; - dst_page->precious = FALSE; - } else { - /* - * use pageclean setup, it is more - * convenient even for the pageout - * cases here - */ - vm_object_lock(upl->map_object); - vm_pageclean_setup(dst_page, alias_page, upl->map_object, size - xfer_size); - vm_object_unlock(upl->map_object); +/* + * This function is called only from vm_pageout_scan and + * it will put a page back on the active/inactive queue + * if we can't reclaim it for some reason. + */ +static void +vps_requeue_page(vm_page_t m, int page_prev_q_state, __unused boolean_t page_from_bg_q) +{ + if (page_prev_q_state == VM_PAGE_ON_SPECULATIVE_Q) { + vm_page_enqueue_inactive(m, FALSE); + } else { + vm_page_activate(m); + } - alias_page->absent = FALSE; - alias_page = NULL; - } -#if MACH_PAGEMAP - /* - * Record that this page has been - * written out - */ - vm_external_state_set(object->existence_map, dst_page->offset); -#endif /*MACH_PAGEMAP*/ - dst_page->dirty = dirty; - - if (!dirty) - dst_page->precious = TRUE; - - if (dst_page->pageout) - dst_page->busy = TRUE; - - if ( (cntrl_flags & UPL_ENCRYPT) ) { - /* - * ENCRYPTED SWAP: - * We want to deny access to the target page - * because its contents are about to be - * encrypted and the user would be very - * confused to see encrypted data instead - * of their data. - * We also set "encrypted_cleaning" to allow - * vm_pageout_scan() to demote that page - * from "adjacent/clean-in-place" to - * "target/clean-and-free" if it bumps into - * this page during its scanning while we're - * still processing this cluster. - */ - dst_page->busy = TRUE; - dst_page->encrypted_cleaning = TRUE; - } - if ( !(cntrl_flags & UPL_CLEAN_IN_PLACE) ) { - /* - * deny access to the target page - * while it is being worked on - */ - if ((!dst_page->pageout) && ( !VM_PAGE_WIRED(dst_page))) { - dst_page->busy = TRUE; - dst_page->pageout = TRUE; +#if CONFIG_BACKGROUND_QUEUE +#if DEVELOPMENT || DEBUG + vm_object_t m_object = VM_PAGE_OBJECT(m); - dwp->dw_mask |= DW_vm_page_wire; - } - } + if (page_from_bg_q == TRUE) { + if (m_object->internal) { + vm_pageout_rejected_bq_internal++; } else { - if ((cntrl_flags & UPL_WILL_MODIFY) && object->copy != last_copy_object) { - /* - * Honor copy-on-write obligations - * - * The copy object has changed since we - * last synchronized for copy-on-write. - * Another copy object might have been - * inserted while we released the object's - * lock. Since someone could have seen the - * original contents of the remaining pages - * through that new object, we have to - * synchronize with it again for the remaining - * pages only. The previous pages are "busy" - * so they can not be seen through the new - * mapping. The new mapping will see our - * upcoming changes for those previous pages, - * but that's OK since they couldn't see what - * was there before. It's just a race anyway - * and there's no guarantee of consistency or - * atomicity. We just don't want new mappings - * to see both the *before* and *after* pages. - */ - if (object->copy != VM_OBJECT_NULL) { - vm_object_update( - object, - dst_offset,/* current offset */ - xfer_size, /* remaining size */ - NULL, - NULL, - FALSE, /* should_return */ - MEMORY_OBJECT_COPY_SYNC, - VM_PROT_NO_CHANGE); + vm_pageout_rejected_bq_external++; + } + } +#endif /* DEVELOPMENT || DEBUG */ +#endif /* CONFIG_BACKGROUND_QUEUE */ +} -#if DEVELOPMENT || DEBUG - upl_cow_again++; - upl_cow_again_pages += xfer_size >> PAGE_SHIFT; -#endif - } - /* - * remember the copy object we synced with - */ - last_copy_object = object->copy; - } - dst_page = vm_page_lookup(object, dst_offset); - - if (dst_page != VM_PAGE_NULL) { - - if ((cntrl_flags & UPL_RET_ONLY_ABSENT)) { +/* + * This function is called only from vm_pageout_scan and + * it will try to grab the victim page's VM object (m_object) + * which differs from the previous victim page's object (object). + */ +static int +vps_switch_object(vm_page_t m, vm_object_t m_object, vm_object_t *object, int page_prev_q_state, boolean_t avoid_anon_pages, boolean_t page_from_bg_q) +{ + struct vm_speculative_age_q *sq; - if ( !(dst_page->absent && dst_page->list_req_pending) ) { - /* - * skip over pages already present in the cache - */ - if (user_page_list) - user_page_list[entry].phys_addr = 0; + sq = &vm_page_queue_speculative[VM_PAGE_SPECULATIVE_AGED_Q]; - goto try_next_page; - } - } - if ( !(dst_page->list_req_pending) ) { + /* + * the object associated with candidate page is + * different from the one we were just working + * with... dump the lock if we still own it + */ + if (*object != NULL) { + vm_object_unlock(*object); + *object = NULL; + } + /* + * Try to lock object; since we've alread got the + * page queues lock, we can only 'try' for this one. + * if the 'try' fails, we need to do a mutex_pause + * to allow the owner of the object lock a chance to + * run... otherwise, we're likely to trip over this + * object in the same state as we work our way through + * the queue... clumps of pages associated with the same + * object are fairly typical on the inactive and active queues + */ + if (!vm_object_lock_try_scan(m_object)) { + vm_page_t m_want = NULL; - if (dst_page->cleaning) { - /* - * someone else is writing to the page... wait... - */ - PAGE_SLEEP(object, dst_page, THREAD_UNINT); + vm_pageout_vminfo.vm_pageout_inactive_nolock++; - continue; - } - } else { - if (dst_page->fictitious && - dst_page->phys_page == vm_page_fictitious_addr) { - assert( !dst_page->speculative); - /* - * dump the fictitious page - */ - dst_page->list_req_pending = FALSE; + if (page_prev_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) { + VM_PAGEOUT_DEBUG(vm_pageout_cleaned_nolock, 1); + } - VM_PAGE_FREE(dst_page); + pmap_clear_reference(VM_PAGE_GET_PHYS_PAGE(m)); - dst_page = NULL; + m->vmp_reference = FALSE; - } else if (dst_page->absent) { - /* - * the default_pager case - */ - dst_page->list_req_pending = FALSE; - dst_page->busy = FALSE; + if (!m_object->object_is_shared_cache) { + /* + * don't apply this optimization if this is the shared cache + * object, it's too easy to get rid of very hot and important + * pages... + * m->vmp_object must be stable since we hold the page queues lock... + * we can update the scan_collisions field sans the object lock + * since it is a separate field and this is the only spot that does + * a read-modify-write operation and it is never executed concurrently... + * we can asynchronously set this field to 0 when creating a UPL, so it + * is possible for the value to be a bit non-determistic, but that's ok + * since it's only used as a hint + */ + m_object->scan_collisions = 1; + } + if (!vm_page_queue_empty(&vm_page_queue_cleaned)) { + m_want = (vm_page_t) vm_page_queue_first(&vm_page_queue_cleaned); + } else if (!vm_page_queue_empty(&sq->age_q)) { + m_want = (vm_page_t) vm_page_queue_first(&sq->age_q); + } else if ((avoid_anon_pages || vm_page_queue_empty(&vm_page_queue_anonymous)) && + !vm_page_queue_empty(&vm_page_queue_inactive)) { + m_want = (vm_page_t) vm_page_queue_first(&vm_page_queue_inactive); + } else if (!vm_page_queue_empty(&vm_page_queue_anonymous)) { + m_want = (vm_page_t) vm_page_queue_first(&vm_page_queue_anonymous); + } - } else if (dst_page->pageout) { - /* - * page was earmarked by vm_pageout_scan - * to be cleaned and stolen... we're going - * to take it back since we are not attempting - * to read that page and we don't want to stall - * waiting for it to be cleaned for 2 reasons... - * 1 - no use paging it out and back in - * 2 - if we stall, we may casue a deadlock in - * the FS trying to acquire the its locks - * on the VNOP_PAGEOUT path presuming that - * those locks are already held on the read - * path before trying to create this UPL - * - * so undo all of the state that vm_pageout_scan - * hung on this page - */ - dst_page->busy = FALSE; + /* + * this is the next object we're going to be interested in + * try to make sure its available after the mutex_pause + * returns control + */ + if (m_want) { + vm_pageout_scan_wants_object = VM_PAGE_OBJECT(m_want); + } - vm_pageout_queue_steal(dst_page, FALSE); - } - } - } - if (dst_page == VM_PAGE_NULL) { - if (object->private) { - /* - * This is a nasty wrinkle for users - * of upl who encounter device or - * private memory however, it is - * unavoidable, only a fault can - * resolve the actual backing - * physical page by asking the - * backing device. - */ - if (user_page_list) - user_page_list[entry].phys_addr = 0; + vps_requeue_page(m, page_prev_q_state, page_from_bg_q); - goto try_next_page; - } - /* - * need to allocate a page - */ - dst_page = vm_page_grab(); + return VM_PAGEOUT_SCAN_NEXT_ITERATION; + } else { + *object = m_object; + vm_pageout_scan_wants_object = VM_OBJECT_NULL; + } - if (dst_page == VM_PAGE_NULL) { - if ( (cntrl_flags & (UPL_RET_ONLY_ABSENT | UPL_NOBLOCK)) == (UPL_RET_ONLY_ABSENT | UPL_NOBLOCK)) { - /* - * we don't want to stall waiting for pages to come onto the free list - * while we're already holding absent pages in this UPL - * the caller will deal with the empty slots - */ - if (user_page_list) - user_page_list[entry].phys_addr = 0; + return VM_PAGEOUT_SCAN_PROCEED; +} - goto try_next_page; - } - /* - * no pages available... wait - * then try again for the same - * offset... - */ - vm_object_unlock(object); - VM_PAGE_WAIT(); - vm_object_lock(object); +/* + * This function is called only from vm_pageout_scan and + * it notices that pageout scan may be rendered ineffective + * due to a FS deadlock and will jetsam a process if possible. + * If jetsam isn't supported, it'll move the page to the active + * queue to try and get some different pages pushed onwards so + * we can try to get out of this scenario. + */ +static void +vps_deal_with_throttled_queues(vm_page_t m, vm_object_t *object, uint32_t *vm_pageout_inactive_external_forced_reactivate_limit, + int *delayed_unlock, boolean_t *force_anonymous, __unused boolean_t is_page_from_bg_q) +{ + struct vm_pageout_queue *eq; + vm_object_t cur_object = VM_OBJECT_NULL; - continue; - } - vm_page_insert(dst_page, object, dst_offset); + cur_object = *object; - dst_page->absent = TRUE; - dst_page->busy = FALSE; + eq = &vm_pageout_queue_external; - if (cntrl_flags & UPL_RET_ONLY_ABSENT) { - /* - * if UPL_RET_ONLY_ABSENT was specified, - * than we're definitely setting up a - * upl for a clustered read/pagein - * operation... mark the pages as clustered - * so upl_commit_range can put them on the - * speculative list - */ - dst_page->clustered = TRUE; - } - } - if (dst_page->fictitious) { - panic("need corner case for fictitious page"); - } - if (dst_page->busy) { - /* - * someone else is playing with the - * page. We will have to wait. - */ - PAGE_SLEEP(object, dst_page, THREAD_UNINT); + if (cur_object->internal == FALSE) { + /* + * we need to break up the following potential deadlock case... + * a) The external pageout thread is stuck on the truncate lock for a file that is being extended i.e. written. + * b) The thread doing the writing is waiting for pages while holding the truncate lock + * c) Most of the pages in the inactive queue belong to this file. + * + * we are potentially in this deadlock because... + * a) the external pageout queue is throttled + * b) we're done with the active queue and moved on to the inactive queue + * c) we've got a dirty external page + * + * since we don't know the reason for the external pageout queue being throttled we + * must suspect that we are deadlocked, so move the current page onto the active queue + * in an effort to cause a page from the active queue to 'age' to the inactive queue + * + * if we don't have jetsam configured (i.e. we have a dynamic pager), set + * 'force_anonymous' to TRUE to cause us to grab a page from the cleaned/anonymous + * pool the next time we select a victim page... if we can make enough new free pages, + * the deadlock will break, the external pageout queue will empty and it will no longer + * be throttled + * + * if we have jetsam configured, keep a count of the pages reactivated this way so + * that we can try to find clean pages in the active/inactive queues before + * deciding to jetsam a process + */ + vm_pageout_vminfo.vm_pageout_scan_inactive_throttled_external++; - continue; - } - /* - * ENCRYPTED SWAP: - */ - if (cntrl_flags & UPL_ENCRYPT) { - /* - * The page is going to be encrypted when we - * get it from the pager, so mark it so. - */ - dst_page->encrypted = TRUE; - } else { - /* - * Otherwise, the page will not contain - * encrypted data. - */ - dst_page->encrypted = FALSE; - } - dst_page->overwriting = TRUE; + vm_page_check_pageable_safe(m); + assert(m->vmp_q_state == VM_PAGE_NOT_ON_Q); + vm_page_queue_enter(&vm_page_queue_active, m, vmp_pageq); + m->vmp_q_state = VM_PAGE_ON_ACTIVE_Q; + vm_page_active_count++; + vm_page_pageable_external_count++; - if (dst_page->pmapped) { - if ( !(cntrl_flags & UPL_FILE_IO)) - /* - * eliminate all mappings from the - * original object and its prodigy - */ - refmod_state = pmap_disconnect(dst_page->phys_page); - else - refmod_state = pmap_get_refmod(dst_page->phys_page); - } else - refmod_state = 0; + vm_pageout_adjust_eq_iothrottle(eq, FALSE); - hw_dirty = refmod_state & VM_MEM_MODIFIED; - dirty = hw_dirty ? TRUE : dst_page->dirty; +#if CONFIG_MEMORYSTATUS && CONFIG_JETSAM - if (cntrl_flags & UPL_SET_LITE) { - unsigned int pg_num; +#pragma unused(force_anonymous) - pg_num = (unsigned int) ((dst_offset-offset)/PAGE_SIZE); - assert(pg_num == (dst_offset-offset)/PAGE_SIZE); - lite_list[pg_num>>5] |= 1 << (pg_num & 31); + *vm_pageout_inactive_external_forced_reactivate_limit -= 1; - if (hw_dirty) - pmap_clear_modify(dst_page->phys_page); + if (*vm_pageout_inactive_external_forced_reactivate_limit <= 0) { + *vm_pageout_inactive_external_forced_reactivate_limit = vm_page_active_count + vm_page_inactive_count; + /* + * Possible deadlock scenario so request jetsam action + */ - /* - * Mark original page as cleaning - * in place. - */ - dst_page->cleaning = TRUE; - dst_page->precious = FALSE; - } else { - /* - * use pageclean setup, it is more - * convenient even for the pageout - * cases here - */ - vm_object_lock(upl->map_object); - vm_pageclean_setup(dst_page, alias_page, upl->map_object, size - xfer_size); - vm_object_unlock(upl->map_object); + assert(cur_object); + vm_object_unlock(cur_object); - alias_page->absent = FALSE; - alias_page = NULL; - } + cur_object = VM_OBJECT_NULL; - if (cntrl_flags & UPL_CLEAN_IN_PLACE) { - /* - * clean in place for read implies - * that a write will be done on all - * the pages that are dirty before - * a upl commit is done. The caller - * is obligated to preserve the - * contents of all pages marked dirty - */ - upl->flags |= UPL_CLEAR_DIRTY; - } - dst_page->dirty = dirty; + /* + * VM pageout scan needs to know we have dropped this lock and so set the + * object variable we got passed in to NULL. + */ + *object = VM_OBJECT_NULL; - if (!dirty) - dst_page->precious = TRUE; + vm_page_unlock_queues(); - if ( !VM_PAGE_WIRED(dst_page)) { - /* - * deny access to the target page while - * it is being worked on - */ - dst_page->busy = TRUE; - } else - dwp->dw_mask |= DW_vm_page_wire; + VM_DEBUG_CONSTANT_EVENT(vm_pageout_jetsam, VM_PAGEOUT_JETSAM, DBG_FUNC_START, + vm_page_active_count, vm_page_inactive_count, vm_page_free_count, vm_page_free_count); - /* - * We might be about to satisfy a fault which has been - * requested. So no need for the "restart" bit. - */ - dst_page->restart = FALSE; - if (!dst_page->absent && !(cntrl_flags & UPL_WILL_MODIFY)) { - /* - * expect the page to be used - */ - dwp->dw_mask |= DW_set_reference; + /* Kill first suitable process. If this call returned FALSE, we might have simply purged a process instead. */ + if (memorystatus_kill_on_VM_page_shortage(FALSE) == TRUE) { + VM_PAGEOUT_DEBUG(vm_pageout_inactive_external_forced_jetsam_count, 1); } - dst_page->precious = (cntrl_flags & UPL_PRECIOUS) ? TRUE : FALSE; - } - if (dst_page->phys_page > upl->highest_page) - upl->highest_page = dst_page->phys_page; - if (user_page_list) { - user_page_list[entry].phys_addr = dst_page->phys_page; - user_page_list[entry].pageout = dst_page->pageout; - user_page_list[entry].absent = dst_page->absent; - user_page_list[entry].dirty = dst_page->dirty; - user_page_list[entry].precious = dst_page->precious; - user_page_list[entry].device = FALSE; - if (dst_page->clustered == TRUE) - user_page_list[entry].speculative = dst_page->speculative; - else - user_page_list[entry].speculative = FALSE; - user_page_list[entry].cs_validated = dst_page->cs_validated; - user_page_list[entry].cs_tainted = dst_page->cs_tainted; - } - /* - * if UPL_RET_ONLY_ABSENT is set, then - * we are working with a fresh page and we've - * just set the clustered flag on it to - * indicate that it was drug in as part of a - * speculative cluster... so leave it alone - */ - if ( !(cntrl_flags & UPL_RET_ONLY_ABSENT)) { - /* - * someone is explicitly grabbing this page... - * update clustered and speculative state - * - */ - VM_PAGE_CONSUME_CLUSTERED(dst_page); + + VM_DEBUG_CONSTANT_EVENT(vm_pageout_jetsam, VM_PAGEOUT_JETSAM, DBG_FUNC_END, + vm_page_active_count, vm_page_inactive_count, vm_page_free_count, vm_page_free_count); + + vm_page_lock_queues(); + *delayed_unlock = 1; } -try_next_page: - if (dwp->dw_mask) { - if (dwp->dw_mask & DW_vm_page_activate) - VM_STAT_INCR(reactivations); +#else /* CONFIG_MEMORYSTATUS && CONFIG_JETSAM */ - if (dst_page->busy == FALSE) { - /* - * dw_do_work may need to drop the object lock - * if it does, we need the pages it's looking at to - * be held stable via the busy bit. - */ - dst_page->busy = TRUE; - dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); - } - dwp->dw_m = dst_page; - dwp++; - dw_count++; +#pragma unused(vm_pageout_inactive_external_forced_reactivate_limit) +#pragma unused(delayed_unlock) - if (dw_count >= DELAYED_WORK_LIMIT) { - dw_do_work(object, &dw_array[0], dw_count); + *force_anonymous = TRUE; +#endif /* CONFIG_MEMORYSTATUS && CONFIG_JETSAM */ + } else { + vm_page_activate(m); + VM_STAT_INCR(reactivations); - dwp = &dw_array[0]; - dw_count = 0; +#if CONFIG_BACKGROUND_QUEUE +#if DEVELOPMENT || DEBUG + if (is_page_from_bg_q == TRUE) { + if (cur_object->internal) { + vm_pageout_rejected_bq_internal++; + } else { + vm_pageout_rejected_bq_external++; } } - entry++; - dst_offset += PAGE_SIZE_64; - xfer_size -= PAGE_SIZE; - } - if (dw_count) - dw_do_work(object, &dw_array[0], dw_count); - - if (alias_page != NULL) { - VM_PAGE_FREE(alias_page); - } +#endif /* DEVELOPMENT || DEBUG */ +#endif /* CONFIG_BACKGROUND_QUEUE */ - if (page_list_count != NULL) { - if (upl->flags & UPL_INTERNAL) - *page_list_count = 0; - else if (*page_list_count > entry) - *page_list_count = entry; + vm_pageout_state.vm_pageout_inactive_used++; } -#if UPL_DEBUG - upl->upl_state = 1; -#endif - vm_object_unlock(object); - - return KERN_SUCCESS; } -/* JMM - Backward compatability for now */ -kern_return_t -vm_fault_list_request( /* forward */ - memory_object_control_t control, - vm_object_offset_t offset, - upl_size_t size, - upl_t *upl_ptr, - upl_page_info_t **user_page_list_ptr, - unsigned int page_list_count, - int cntrl_flags); -kern_return_t -vm_fault_list_request( - memory_object_control_t control, - vm_object_offset_t offset, - upl_size_t size, - upl_t *upl_ptr, - upl_page_info_t **user_page_list_ptr, - unsigned int page_list_count, - int cntrl_flags) -{ - unsigned int local_list_count; - upl_page_info_t *user_page_list; - kern_return_t kr; - if((cntrl_flags & UPL_VECTOR)==UPL_VECTOR) - return KERN_INVALID_ARGUMENT; +void +vm_page_balance_inactive(int max_to_move) +{ + vm_page_t m; - if (user_page_list_ptr != NULL) { - local_list_count = page_list_count; - user_page_list = *user_page_list_ptr; - } else { - local_list_count = 0; - user_page_list = NULL; - } - kr = memory_object_upl_request(control, - offset, - size, - upl_ptr, - user_page_list, - &local_list_count, - cntrl_flags); - - if(kr != KERN_SUCCESS) - return kr; + LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_OWNED); - if ((user_page_list_ptr != NULL) && (cntrl_flags & UPL_INTERNAL)) { - *user_page_list_ptr = UPL_GET_INTERNAL_PAGE_LIST(*upl_ptr); + if (hibernation_vmqueues_inspection || hibernate_cleaning_in_progress) { + /* + * It is likely that the hibernation code path is + * dealing with these very queues as we are about + * to move pages around in/from them and completely + * change the linkage of the pages. + * + * And so we skip the rebalancing of these queues. + */ + return; } + vm_page_inactive_target = VM_PAGE_INACTIVE_TARGET(vm_page_active_count + + vm_page_inactive_count + + vm_page_speculative_count); - return KERN_SUCCESS; -} - - - -/* - * Routine: vm_object_super_upl_request - * Purpose: - * Cause the population of a portion of a vm_object - * in much the same way as memory_object_upl_request. - * Depending on the nature of the request, the pages - * returned may be contain valid data or be uninitialized. - * However, the region may be expanded up to the super - * cluster size provided. - */ - -__private_extern__ kern_return_t -vm_object_super_upl_request( - vm_object_t object, - vm_object_offset_t offset, - upl_size_t size, - upl_size_t super_cluster, - upl_t *upl, - upl_page_info_t *user_page_list, - unsigned int *page_list_count, - int cntrl_flags) -{ - if (object->paging_offset > offset || ((cntrl_flags & UPL_VECTOR)==UPL_VECTOR)) - return KERN_FAILURE; - - assert(object->paging_in_progress); - offset = offset - object->paging_offset; + while (max_to_move-- && (vm_page_inactive_count + vm_page_speculative_count) < vm_page_inactive_target) { + VM_PAGEOUT_DEBUG(vm_pageout_balanced, 1); - if (super_cluster > size) { + m = (vm_page_t) vm_page_queue_first(&vm_page_queue_active); - vm_object_offset_t base_offset; - upl_size_t super_size; - vm_object_size_t super_size_64; + assert(m->vmp_q_state == VM_PAGE_ON_ACTIVE_Q); + assert(!m->vmp_laundry); + assert(VM_PAGE_OBJECT(m) != kernel_object); + assert(VM_PAGE_GET_PHYS_PAGE(m) != vm_page_guard_addr); - base_offset = (offset & ~((vm_object_offset_t) super_cluster - 1)); - super_size = (offset + size) > (base_offset + super_cluster) ? super_cluster<<1 : super_cluster; - super_size_64 = ((base_offset + super_size) > object->size) ? (object->size - base_offset) : super_size; - super_size = (upl_size_t) super_size_64; - assert(super_size == super_size_64); + DTRACE_VM2(scan, int, 1, (uint64_t *), NULL); - if (offset > (base_offset + super_size)) { - panic("vm_object_super_upl_request: Missed target pageout" - " %#llx,%#llx, %#x, %#x, %#x, %#llx\n", - offset, base_offset, super_size, super_cluster, - size, object->paging_offset); - } /* - * apparently there is a case where the vm requests a - * page to be written out who's offset is beyond the - * object size + * by not passing in a pmap_flush_context we will forgo any TLB flushing, local or otherwise... + * + * a TLB flush isn't really needed here since at worst we'll miss the reference bit being + * updated in the PTE if a remote processor still has this mapping cached in its TLB when the + * new reference happens. If no futher references happen on the page after that remote TLB flushes + * we'll see a clean, non-referenced page when it eventually gets pulled out of the inactive queue + * by pageout_scan, which is just fine since the last reference would have happened quite far + * in the past (TLB caches don't hang around for very long), and of course could just as easily + * have happened before we moved the page */ - if ((offset + size) > (base_offset + super_size)) { - super_size_64 = (offset + size) - base_offset; - super_size = (upl_size_t) super_size_64; - assert(super_size == super_size_64); + if (m->vmp_pmapped == TRUE) { + pmap_clear_refmod_options(VM_PAGE_GET_PHYS_PAGE(m), VM_MEM_REFERENCED, PMAP_OPTIONS_NOFLUSH, (void *)NULL); } - offset = base_offset; - size = super_size; + /* + * The page might be absent or busy, + * but vm_page_deactivate can handle that. + * FALSE indicates that we don't want a H/W clear reference + */ + vm_page_deactivate_internal(m, FALSE); } - return vm_object_upl_request(object, offset, size, upl, user_page_list, page_list_count, cntrl_flags); } -kern_return_t -vm_map_create_upl( - vm_map_t map, - vm_map_address_t offset, - upl_size_t *upl_size, - upl_t *upl, - upl_page_info_array_t page_list, - unsigned int *count, - int *flags) +/* + * vm_pageout_scan does the dirty work for the pageout daemon. + * It returns with both vm_page_queue_free_lock and vm_page_queue_lock + * held and vm_page_free_wanted == 0. + */ +void +vm_pageout_scan(void) { - vm_map_entry_t entry; - int caller_flags; - int force_data_sync; - int sync_cow_data; - vm_object_t local_object; - vm_map_offset_t local_offset; - vm_map_offset_t local_start; - kern_return_t ret; - - caller_flags = *flags; + unsigned int loop_count = 0; + unsigned int inactive_burst_count = 0; + unsigned int reactivated_this_call; + unsigned int reactivate_limit; + vm_page_t local_freeq = NULL; + int local_freed = 0; + int delayed_unlock; + int delayed_unlock_limit = 0; + int refmod_state = 0; + int vm_pageout_deadlock_target = 0; + struct vm_pageout_queue *iq; + struct vm_pageout_queue *eq; + struct vm_speculative_age_q *sq; + struct flow_control flow_control = { .state = 0, .ts = { .tv_sec = 0, .tv_nsec = 0 } }; + boolean_t inactive_throttled = FALSE; + vm_object_t object = NULL; + uint32_t inactive_reclaim_run; + boolean_t grab_anonymous = FALSE; + boolean_t force_anonymous = FALSE; + boolean_t force_speculative_aging = FALSE; + int anons_grabbed = 0; + int page_prev_q_state = 0; + boolean_t page_from_bg_q = FALSE; + uint32_t vm_pageout_inactive_external_forced_reactivate_limit = 0; + vm_object_t m_object = VM_OBJECT_NULL; + int retval = 0; + boolean_t lock_yield_check = FALSE; + + + VM_DEBUG_CONSTANT_EVENT(vm_pageout_scan, VM_PAGEOUT_SCAN, DBG_FUNC_START, + vm_pageout_vminfo.vm_pageout_freed_speculative, + vm_pageout_state.vm_pageout_inactive_clean, + vm_pageout_vminfo.vm_pageout_inactive_dirty_internal, + vm_pageout_vminfo.vm_pageout_inactive_dirty_external); - if (caller_flags & ~UPL_VALID_FLAGS) { - /* - * For forward compatibility's sake, - * reject any unknown flag. - */ - return KERN_INVALID_VALUE; - } - force_data_sync = (caller_flags & UPL_FORCE_DATA_SYNC); - sync_cow_data = !(caller_flags & UPL_COPYOUT_FROM); + flow_control.state = FCS_IDLE; + iq = &vm_pageout_queue_internal; + eq = &vm_pageout_queue_external; + sq = &vm_page_queue_speculative[VM_PAGE_SPECULATIVE_AGED_Q]; - if (upl == NULL) - return KERN_INVALID_ARGUMENT; + /* Ask the pmap layer to return any pages it no longer needs. */ + uint64_t pmap_wired_pages_freed = pmap_release_pages_fast(); -REDISCOVER_ENTRY: - vm_map_lock_read(map); + vm_page_lock_queues(); - if (vm_map_lookup_entry(map, offset, &entry)) { + vm_page_wire_count -= pmap_wired_pages_freed; - if ((entry->vme_end - offset) < *upl_size) { - *upl_size = (upl_size_t) (entry->vme_end - offset); - assert(*upl_size == entry->vme_end - offset); - } + delayed_unlock = 1; - if (caller_flags & UPL_QUERY_OBJECT_TYPE) { - *flags = 0; + /* + * Calculate the max number of referenced pages on the inactive + * queue that we will reactivate. + */ + reactivated_this_call = 0; + reactivate_limit = VM_PAGE_REACTIVATE_LIMIT(vm_page_active_count + + vm_page_inactive_count); + inactive_reclaim_run = 0; - if ( !entry->is_sub_map && entry->object.vm_object != VM_OBJECT_NULL) { - if (entry->object.vm_object->private) - *flags = UPL_DEV_MEMORY; + vm_pageout_inactive_external_forced_reactivate_limit = vm_page_active_count + vm_page_inactive_count; - if (entry->object.vm_object->phys_contiguous) - *flags |= UPL_PHYS_CONTIG; - } - vm_map_unlock_read(map); + /* + * We must limit the rate at which we send pages to the pagers + * so that we don't tie up too many pages in the I/O queues. + * We implement a throttling mechanism using the laundry count + * to limit the number of pages outstanding to the default + * and external pagers. We can bypass the throttles and look + * for clean pages if the pageout queues don't drain in a timely + * fashion since this may indicate that the pageout paths are + * stalled waiting for memory, which only we can provide. + */ - return KERN_SUCCESS; - } - if (entry->object.vm_object == VM_OBJECT_NULL || !entry->object.vm_object->phys_contiguous) { - if ((*upl_size/PAGE_SIZE) > MAX_UPL_SIZE) - *upl_size = MAX_UPL_SIZE * PAGE_SIZE; - } - /* - * Create an object if necessary. - */ - if (entry->object.vm_object == VM_OBJECT_NULL) { + vps_init_page_targets(); + assert(object == NULL); + assert(delayed_unlock != 0); - if (vm_map_lock_read_to_write(map)) - goto REDISCOVER_ENTRY; + for (;;) { + vm_page_t m; - entry->object.vm_object = vm_object_allocate((vm_size_t)(entry->vme_end - entry->vme_start)); - entry->offset = 0; + DTRACE_VM2(rev, int, 1, (uint64_t *), NULL); - vm_map_lock_write_to_read(map); - } - if (!(caller_flags & UPL_COPYOUT_FROM)) { - if (!(entry->protection & VM_PROT_WRITE)) { - vm_map_unlock_read(map); - return KERN_PROTECTION_FAILURE; - } - if (entry->needs_copy) { - /* - * Honor copy-on-write for COPY_SYMMETRIC - * strategy. - */ - vm_map_t local_map; - vm_object_t object; - vm_object_offset_t new_offset; - vm_prot_t prot; - boolean_t wired; - vm_map_version_t version; - vm_map_t real_map; - - local_map = map; - - if (vm_map_lookup_locked(&local_map, - offset, VM_PROT_WRITE, - OBJECT_LOCK_EXCLUSIVE, - &version, &object, - &new_offset, &prot, &wired, - NULL, - &real_map) != KERN_SUCCESS) { - vm_map_unlock_read(local_map); - return KERN_FAILURE; - } - if (real_map != map) - vm_map_unlock(real_map); - vm_map_unlock_read(local_map); + if (lock_yield_check) { + lock_yield_check = FALSE; - vm_object_unlock(object); + if (delayed_unlock++ > delayed_unlock_limit) { + int freed = local_freed; - goto REDISCOVER_ENTRY; + vm_pageout_prepare_to_block(&object, &delayed_unlock, &local_freeq, &local_freed, + VM_PAGEOUT_PB_CONSIDER_WAKING_COMPACTOR_SWAPPER); + if (freed == 0) { + lck_mtx_yield(&vm_page_queue_lock); + } + } else if (vm_pageout_scan_wants_object) { + vm_page_unlock_queues(); + mutex_pause(0); + vm_page_lock_queues(); } } - if (entry->is_sub_map) { - vm_map_t submap; - - submap = entry->object.sub_map; - local_start = entry->vme_start; - local_offset = entry->offset; - vm_map_reference(submap); - vm_map_unlock_read(map); + if (vm_upl_wait_for_pages < 0) { + vm_upl_wait_for_pages = 0; + } - ret = vm_map_create_upl(submap, - local_offset + (offset - local_start), - upl_size, upl, page_list, count, flags); - vm_map_deallocate(submap); + delayed_unlock_limit = VM_PAGEOUT_DELAYED_UNLOCK_LIMIT + vm_upl_wait_for_pages; - return ret; + if (delayed_unlock_limit > VM_PAGEOUT_DELAYED_UNLOCK_LIMIT_MAX) { + delayed_unlock_limit = VM_PAGEOUT_DELAYED_UNLOCK_LIMIT_MAX; } - if (sync_cow_data) { - if (entry->object.vm_object->shadow || entry->object.vm_object->copy) { - local_object = entry->object.vm_object; - local_start = entry->vme_start; - local_offset = entry->offset; - vm_object_reference(local_object); - vm_map_unlock_read(map); + vps_deal_with_secluded_page_overflow(&local_freeq, &local_freed); - if (local_object->shadow && local_object->copy) { - vm_object_lock_request( - local_object->shadow, - (vm_object_offset_t) - ((offset - local_start) + - local_offset) + - local_object->shadow_offset, - *upl_size, FALSE, - MEMORY_OBJECT_DATA_SYNC, - VM_PROT_NO_CHANGE); - } - sync_cow_data = FALSE; - vm_object_deallocate(local_object); + assert(delayed_unlock); - goto REDISCOVER_ENTRY; - } - } - if (force_data_sync) { - local_object = entry->object.vm_object; - local_start = entry->vme_start; - local_offset = entry->offset; + /* + * maintain our balance + */ + vm_page_balance_inactive(1); - vm_object_reference(local_object); - vm_map_unlock_read(map); - vm_object_lock_request( - local_object, - (vm_object_offset_t) - ((offset - local_start) + local_offset), - (vm_object_size_t)*upl_size, FALSE, - MEMORY_OBJECT_DATA_SYNC, - VM_PROT_NO_CHANGE); + /********************************************************************** + * above this point we're playing with the active and secluded queues + * below this point we're playing with the throttling mechanisms + * and the inactive queue + **********************************************************************/ - force_data_sync = FALSE; - vm_object_deallocate(local_object); + if (vm_page_free_count + local_freed >= vm_page_free_target) { + vm_pageout_scan_wants_object = VM_OBJECT_NULL; - goto REDISCOVER_ENTRY; - } - if (entry->object.vm_object->private) - *flags = UPL_DEV_MEMORY; - else - *flags = 0; + vm_pageout_prepare_to_block(&object, &delayed_unlock, &local_freeq, &local_freed, + VM_PAGEOUT_PB_CONSIDER_WAKING_COMPACTOR_SWAPPER); + /* + * make sure the pageout I/O threads are running + * throttled in case there are still requests + * in the laundry... since we have met our targets + * we don't need the laundry to be cleaned in a timely + * fashion... so let's avoid interfering with foreground + * activity + */ + vm_pageout_adjust_eq_iothrottle(eq, TRUE); - if (entry->object.vm_object->phys_contiguous) - *flags |= UPL_PHYS_CONTIG; + lck_mtx_lock(&vm_page_queue_free_lock); - local_object = entry->object.vm_object; - local_offset = entry->offset; - local_start = entry->vme_start; + if ((vm_page_free_count >= vm_page_free_target) && + (vm_page_free_wanted == 0) && (vm_page_free_wanted_privileged == 0)) { + /* + * done - we have met our target *and* + * there is no one waiting for a page. + */ +return_from_scan: + assert(vm_pageout_scan_wants_object == VM_OBJECT_NULL); - vm_object_reference(local_object); - vm_map_unlock_read(map); + VM_DEBUG_CONSTANT_EVENT(vm_pageout_scan, VM_PAGEOUT_SCAN, DBG_FUNC_NONE, + vm_pageout_state.vm_pageout_inactive, + vm_pageout_state.vm_pageout_inactive_used, 0, 0); + VM_DEBUG_CONSTANT_EVENT(vm_pageout_scan, VM_PAGEOUT_SCAN, DBG_FUNC_END, + vm_pageout_vminfo.vm_pageout_freed_speculative, + vm_pageout_state.vm_pageout_inactive_clean, + vm_pageout_vminfo.vm_pageout_inactive_dirty_internal, + vm_pageout_vminfo.vm_pageout_inactive_dirty_external); - ret = vm_object_iopl_request(local_object, - (vm_object_offset_t) ((offset - local_start) + local_offset), - *upl_size, - upl, - page_list, - count, - caller_flags); - vm_object_deallocate(local_object); + return; + } + lck_mtx_unlock(&vm_page_queue_free_lock); + } - return(ret); - } - vm_map_unlock_read(map); + /* + * Before anything, we check if we have any ripe volatile + * objects around. If so, try to purge the first object. + * If the purge fails, fall through to reclaim a page instead. + * If the purge succeeds, go back to the top and reevalute + * the new memory situation. + */ + retval = vps_purge_object(); - return(KERN_FAILURE); -} + if (retval == VM_PAGEOUT_SCAN_NEXT_ITERATION) { + /* + * Success + */ + if (object != NULL) { + vm_object_unlock(object); + object = NULL; + } -/* - * Internal routine to enter a UPL into a VM map. - * - * JMM - This should just be doable through the standard - * vm_map_enter() API. - */ -kern_return_t -vm_map_enter_upl( - vm_map_t map, - upl_t upl, - vm_map_offset_t *dst_addr) -{ - vm_map_size_t size; - vm_object_offset_t offset; - vm_map_offset_t addr; - vm_page_t m; - kern_return_t kr; - int isVectorUPL = 0, curr_upl=0; - upl_t vector_upl = NULL; - vm_offset_t vector_upl_dst_addr = 0; - vm_map_t vector_upl_submap = NULL; - upl_offset_t subupl_offset = 0; - upl_size_t subupl_size = 0; - - if (upl == UPL_NULL) - return KERN_INVALID_ARGUMENT; + lock_yield_check = FALSE; + continue; + } - if((isVectorUPL = vector_upl_is_valid(upl))) { - int mapped=0,valid_upls=0; - vector_upl = upl; + /* + * If our 'aged' queue is empty and we have some speculative pages + * in the other queues, let's go through and see if we need to age + * them. + * + * If we succeeded in aging a speculative Q or just that everything + * looks normal w.r.t queue age and queue counts, we keep going onward. + * + * If, for some reason, we seem to have a mismatch between the spec. + * page count and the page queues, we reset those variables and + * restart the loop (LD TODO: Track this better?). + */ + if (vm_page_queue_empty(&sq->age_q) && vm_page_speculative_count) { + retval = vps_age_speculative_queue(force_speculative_aging); - upl_lock(vector_upl); - for(curr_upl=0; curr_upl < MAX_VECTOR_UPL_ELEMENTS; curr_upl++) { - upl = vector_upl_subupl_byindex(vector_upl, curr_upl ); - if(upl == NULL) + if (retval == VM_PAGEOUT_SCAN_NEXT_ITERATION) { + lock_yield_check = FALSE; continue; - valid_upls++; - if (UPL_PAGE_LIST_MAPPED & upl->flags) - mapped++; - } - - if(mapped) { - if(mapped != valid_upls) - panic("Only %d of the %d sub-upls within the Vector UPL are alread mapped\n", mapped, valid_upls); - else { - upl_unlock(vector_upl); - return KERN_FAILURE; } } + force_speculative_aging = FALSE; - kr = kmem_suballoc(map, &vector_upl_dst_addr, vector_upl->size, FALSE, VM_FLAGS_ANYWHERE, &vector_upl_submap); - if( kr != KERN_SUCCESS ) - panic("Vector UPL submap allocation failed\n"); - map = vector_upl_submap; - vector_upl_set_submap(vector_upl, vector_upl_submap, vector_upl_dst_addr); - curr_upl=0; - } - else - upl_lock(upl); + /* + * Check to see if we need to evict objects from the cache. + * + * Note: 'object' here doesn't have anything to do with + * the eviction part. We just need to make sure we have dropped + * any object lock we might be holding if we need to go down + * into the eviction logic. + */ + retval = vps_object_cache_evict(&object); -process_upl_to_enter: - if(isVectorUPL){ - if(curr_upl == MAX_VECTOR_UPL_ELEMENTS) { - *dst_addr = vector_upl_dst_addr; - upl_unlock(vector_upl); - return KERN_SUCCESS; + if (retval == VM_PAGEOUT_SCAN_NEXT_ITERATION) { + lock_yield_check = FALSE; + continue; } - upl = vector_upl_subupl_byindex(vector_upl, curr_upl++ ); - if(upl == NULL) - goto process_upl_to_enter; - vector_upl_get_iostate(vector_upl, upl, &subupl_offset, &subupl_size); - *dst_addr = (vm_map_offset_t)(vector_upl_dst_addr + (vm_map_offset_t)subupl_offset); - } - /* - * check to see if already mapped - */ - if (UPL_PAGE_LIST_MAPPED & upl->flags) { - upl_unlock(upl); - return KERN_FAILURE; - } - if ((!(upl->flags & UPL_SHADOWED)) && !((upl->flags & (UPL_DEVICE_MEMORY | UPL_IO_WIRE)) || - (upl->map_object->phys_contiguous))) { - vm_object_t object; - vm_page_t alias_page; - vm_object_offset_t new_offset; - unsigned int pg_num; - wpl_array_t lite_list; + /* + * Calculate our filecache_min that will affect the loop + * going forward. + */ + vps_calculate_filecache_min(); - if (upl->flags & UPL_INTERNAL) { - lite_list = (wpl_array_t) - ((((uintptr_t)upl) + sizeof(struct upl)) - + ((upl->size/PAGE_SIZE) * sizeof(upl_page_info_t))); - } else { - lite_list = (wpl_array_t)(((uintptr_t)upl) + sizeof(struct upl)); - } - object = upl->map_object; - upl->map_object = vm_object_allocate(upl->size); + /* + * LD TODO: Use a structure to hold all state variables for a single + * vm_pageout_scan iteration and pass that structure to this function instead. + */ + retval = vps_flow_control(&flow_control, &anons_grabbed, &object, + &delayed_unlock, &local_freeq, &local_freed, + &vm_pageout_deadlock_target, inactive_burst_count); - vm_object_lock(upl->map_object); + if (retval == VM_PAGEOUT_SCAN_NEXT_ITERATION) { + if (loop_count >= vm_page_inactive_count) { + loop_count = 0; + } - upl->map_object->shadow = object; - upl->map_object->pageout = TRUE; - upl->map_object->can_persist = FALSE; - upl->map_object->copy_strategy = MEMORY_OBJECT_COPY_NONE; - upl->map_object->shadow_offset = upl->offset - object->paging_offset; - upl->map_object->wimg_bits = object->wimg_bits; - offset = upl->map_object->shadow_offset; - new_offset = 0; - size = upl->size; + inactive_burst_count = 0; - upl->flags |= UPL_SHADOWED; + assert(object == NULL); + assert(delayed_unlock != 0); - while (size) { - pg_num = (unsigned int) (new_offset / PAGE_SIZE); - assert(pg_num == new_offset / PAGE_SIZE); + lock_yield_check = FALSE; + continue; + } else if (retval == VM_PAGEOUT_SCAN_DONE_RETURN) { + goto return_from_scan; + } - if (lite_list[pg_num>>5] & (1 << (pg_num & 31))) { + flow_control.state = FCS_IDLE; - VM_PAGE_GRAB_FICTITIOUS(alias_page); + vm_pageout_inactive_external_forced_reactivate_limit = MIN((vm_page_active_count + vm_page_inactive_count), + vm_pageout_inactive_external_forced_reactivate_limit); + loop_count++; + inactive_burst_count++; + vm_pageout_state.vm_pageout_inactive++; - vm_object_lock(object); + /* + * Choose a victim. + */ - m = vm_page_lookup(object, offset); - if (m == VM_PAGE_NULL) { - panic("vm_upl_map: page missing\n"); - } + m = NULL; + retval = vps_choose_victim_page(&m, &anons_grabbed, &grab_anonymous, force_anonymous, &page_from_bg_q, &reactivated_this_call); - /* - * Convert the fictitious page to a private - * shadow of the real page. - */ - assert(alias_page->fictitious); - alias_page->fictitious = FALSE; - alias_page->private = TRUE; - alias_page->pageout = TRUE; - /* - * since m is a page in the upl it must - * already be wired or BUSY, so it's - * safe to assign the underlying physical - * page to the alias - */ - alias_page->phys_page = m->phys_page; + if (m == NULL) { + if (retval == VM_PAGEOUT_SCAN_NEXT_ITERATION) { + inactive_burst_count = 0; - vm_object_unlock(object); + if (page_prev_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) { + VM_PAGEOUT_DEBUG(vm_pageout_cleaned_reactivated, 1); + } - vm_page_lockspin_queues(); - vm_page_wire(alias_page); - vm_page_unlock_queues(); - - /* - * ENCRYPTED SWAP: - * The virtual page ("m") has to be wired in some way - * here or its physical page ("m->phys_page") could - * be recycled at any time. - * Assuming this is enforced by the caller, we can't - * get an encrypted page here. Since the encryption - * key depends on the VM page's "pager" object and - * the "paging_offset", we couldn't handle 2 pageable - * VM pages (with different pagers and paging_offsets) - * sharing the same physical page: we could end up - * encrypting with one key (via one VM page) and - * decrypting with another key (via the alias VM page). - */ - ASSERT_PAGE_DECRYPTED(m); + lock_yield_check = TRUE; + continue; + } - vm_page_insert(alias_page, upl->map_object, new_offset); + /* + * if we've gotten here, we have no victim page. + * check to see if we've not finished balancing the queues + * or we have a page on the aged speculative queue that we + * skipped due to force_anonymous == TRUE.. or we have + * speculative pages that we can prematurely age... if + * one of these cases we'll keep going, else panic + */ + force_anonymous = FALSE; + VM_PAGEOUT_DEBUG(vm_pageout_no_victim, 1); - assert(!alias_page->wanted); - alias_page->busy = FALSE; - alias_page->absent = FALSE; + if (!vm_page_queue_empty(&sq->age_q)) { + lock_yield_check = TRUE; + continue; } - size -= PAGE_SIZE; - offset += PAGE_SIZE_64; - new_offset += PAGE_SIZE_64; + + if (vm_page_speculative_count) { + force_speculative_aging = TRUE; + lock_yield_check = TRUE; + continue; + } + panic("vm_pageout: no victim"); + + /* NOTREACHED */ } - vm_object_unlock(upl->map_object); - } - if ((upl->flags & (UPL_DEVICE_MEMORY | UPL_IO_WIRE)) || upl->map_object->phys_contiguous) - offset = upl->offset - upl->map_object->paging_offset; - else - offset = 0; - size = upl->size; - - vm_object_reference(upl->map_object); - if(!isVectorUPL) { - *dst_addr = 0; + assert(VM_PAGE_PAGEABLE(m)); + m_object = VM_PAGE_OBJECT(m); + force_anonymous = FALSE; + + page_prev_q_state = m->vmp_q_state; /* - * NEED A UPL_MAP ALIAS - */ - kr = vm_map_enter(map, dst_addr, (vm_map_size_t)size, (vm_map_offset_t) 0, - VM_FLAGS_ANYWHERE, upl->map_object, offset, FALSE, - VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT); - } - else { - kr = vm_map_enter(map, dst_addr, (vm_map_size_t)size, (vm_map_offset_t) 0, - VM_FLAGS_FIXED, upl->map_object, offset, FALSE, - VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT); - if(kr) - panic("vm_map_enter failed for a Vector UPL\n"); - } + * we just found this page on one of our queues... + * it can't also be on the pageout queue, so safe + * to call vm_page_queues_remove + */ + vm_page_queues_remove(m, TRUE); - if (kr != KERN_SUCCESS) { - upl_unlock(upl); - return(kr); - } - vm_object_lock(upl->map_object); + assert(!m->vmp_laundry); + assert(!m->vmp_private); + assert(!m->vmp_fictitious); + assert(m_object != kernel_object); + assert(VM_PAGE_GET_PHYS_PAGE(m) != vm_page_guard_addr); - for (addr = *dst_addr; size > 0; size -= PAGE_SIZE, addr += PAGE_SIZE) { - m = vm_page_lookup(upl->map_object, offset); + vm_pageout_vminfo.vm_pageout_considered_page++; - if (m) { - unsigned int cache_attr; - cache_attr = ((unsigned int)m->object->wimg_bits) & VM_WIMG_MASK; + DTRACE_VM2(scan, int, 1, (uint64_t *), NULL); + + /* + * check to see if we currently are working + * with the same object... if so, we've + * already got the lock + */ + if (m_object != object) { + boolean_t avoid_anon_pages = (grab_anonymous == FALSE || anons_grabbed >= ANONS_GRABBED_LIMIT); - m->pmapped = TRUE; + /* + * vps_switch_object() will always drop the 'object' lock first + * and then try to acquire the 'm_object' lock. So 'object' has to point to + * either 'm_object' or NULL. + */ + retval = vps_switch_object(m, m_object, &object, page_prev_q_state, avoid_anon_pages, page_from_bg_q); - /* CODE SIGNING ENFORCEMENT: page has been wpmapped, - * but only in kernel space. If this was on a user map, - * we'd have to set the wpmapped bit. */ - /* m->wpmapped = TRUE; */ - assert(map==kernel_map); - - PMAP_ENTER(map->pmap, addr, m, VM_PROT_ALL, cache_attr, TRUE); + if (retval == VM_PAGEOUT_SCAN_NEXT_ITERATION) { + lock_yield_check = TRUE; + continue; + } } - offset += PAGE_SIZE_64; - } - vm_object_unlock(upl->map_object); + assert(m_object == object); + assert(VM_PAGE_OBJECT(m) == m_object); - /* - * hold a reference for the mapping - */ - upl->ref_count++; - upl->flags |= UPL_PAGE_LIST_MAPPED; - upl->kaddr = (vm_offset_t) *dst_addr; - assert(upl->kaddr == *dst_addr); - - if(!isVectorUPL) - upl_unlock(upl); - else - goto process_upl_to_enter; + if (m->vmp_busy) { + /* + * Somebody is already playing with this page. + * Put it back on the appropriate queue + * + */ + VM_PAGEOUT_DEBUG(vm_pageout_inactive_busy, 1); - return KERN_SUCCESS; -} - -/* - * Internal routine to remove a UPL mapping from a VM map. - * - * XXX - This should just be doable through a standard - * vm_map_remove() operation. Otherwise, implicit clean-up - * of the target map won't be able to correctly remove - * these (and release the reference on the UPL). Having - * to do this means we can't map these into user-space - * maps yet. - */ -kern_return_t -vm_map_remove_upl( - vm_map_t map, - upl_t upl) -{ - vm_address_t addr; - upl_size_t size; - int isVectorUPL = 0, curr_upl = 0; - upl_t vector_upl = NULL; + if (page_prev_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) { + VM_PAGEOUT_DEBUG(vm_pageout_cleaned_busy, 1); + } - if (upl == UPL_NULL) - return KERN_INVALID_ARGUMENT; + vps_requeue_page(m, page_prev_q_state, page_from_bg_q); - if((isVectorUPL = vector_upl_is_valid(upl))) { - int unmapped=0, valid_upls=0; - vector_upl = upl; - upl_lock(vector_upl); - for(curr_upl=0; curr_upl < MAX_VECTOR_UPL_ELEMENTS; curr_upl++) { - upl = vector_upl_subupl_byindex(vector_upl, curr_upl ); - if(upl == NULL) + lock_yield_check = TRUE; + continue; + } + + /* + * if (m->vmp_cleaning && !m->vmp_free_when_done) + * If already cleaning this page in place + * just leave if off the paging queues. + * We can leave the page mapped, and upl_commit_range + * will put it on the clean queue. + * + * if (m->vmp_free_when_done && !m->vmp_cleaning) + * an msync INVALIDATE is in progress... + * this page has been marked for destruction + * after it has been cleaned, + * but not yet gathered into a UPL + * where 'cleaning' will be set... + * just leave it off the paging queues + * + * if (m->vmp_free_when_done && m->vmp_clenaing) + * an msync INVALIDATE is in progress + * and the UPL has already gathered this page... + * just leave it off the paging queues + */ + if (m->vmp_free_when_done || m->vmp_cleaning) { + lock_yield_check = TRUE; + continue; + } + + + /* + * If it's absent, in error or the object is no longer alive, + * we can reclaim the page... in the no longer alive case, + * there are 2 states the page can be in that preclude us + * from reclaiming it - busy or cleaning - that we've already + * dealt with + */ + if (m->vmp_absent || m->vmp_error || !object->alive) { + if (m->vmp_absent) { + VM_PAGEOUT_DEBUG(vm_pageout_inactive_absent, 1); + } else if (!object->alive) { + VM_PAGEOUT_DEBUG(vm_pageout_inactive_notalive, 1); + } else { + VM_PAGEOUT_DEBUG(vm_pageout_inactive_error, 1); + } +reclaim_page: + if (vm_pageout_deadlock_target) { + VM_PAGEOUT_DEBUG(vm_pageout_scan_inactive_throttle_success, 1); + vm_pageout_deadlock_target--; + } + + DTRACE_VM2(dfree, int, 1, (uint64_t *), NULL); + + if (object->internal) { + DTRACE_VM2(anonfree, int, 1, (uint64_t *), NULL); + } else { + DTRACE_VM2(fsfree, int, 1, (uint64_t *), NULL); + } + assert(!m->vmp_cleaning); + assert(!m->vmp_laundry); + + if (!object->internal && + object->pager != NULL && + object->pager->mo_pager_ops == &shared_region_pager_ops) { + shared_region_pager_reclaimed++; + } + + m->vmp_busy = TRUE; + + /* + * remove page from object here since we're already + * behind the object lock... defer the rest of the work + * we'd normally do in vm_page_free_prepare_object + * until 'vm_page_free_list' is called + */ + if (m->vmp_tabled) { + vm_page_remove(m, TRUE); + } + + assert(m->vmp_pageq.next == 0 && m->vmp_pageq.prev == 0); + m->vmp_snext = local_freeq; + local_freeq = m; + local_freed++; + + if (page_prev_q_state == VM_PAGE_ON_SPECULATIVE_Q) { + vm_pageout_vminfo.vm_pageout_freed_speculative++; + } else if (page_prev_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) { + vm_pageout_vminfo.vm_pageout_freed_cleaned++; + } else if (page_prev_q_state == VM_PAGE_ON_INACTIVE_INTERNAL_Q) { + vm_pageout_vminfo.vm_pageout_freed_internal++; + } else { + vm_pageout_vminfo.vm_pageout_freed_external++; + } + + inactive_burst_count = 0; + + lock_yield_check = TRUE; + continue; + } + if (object->copy == VM_OBJECT_NULL) { + /* + * No one else can have any interest in this page. + * If this is an empty purgable object, the page can be + * reclaimed even if dirty. + * If the page belongs to a volatile purgable object, we + * reactivate it if the compressor isn't active. + */ + if (object->purgable == VM_PURGABLE_EMPTY) { + if (m->vmp_pmapped == TRUE) { + /* unmap the page */ + refmod_state = pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m)); + if (refmod_state & VM_MEM_MODIFIED) { + SET_PAGE_DIRTY(m, FALSE); + } + } + if (m->vmp_dirty || m->vmp_precious) { + /* we saved the cost of cleaning this page ! */ + vm_page_purged_count++; + } + goto reclaim_page; + } + + if (VM_CONFIG_COMPRESSOR_IS_ACTIVE) { + /* + * With the VM compressor, the cost of + * reclaiming a page is much lower (no I/O), + * so if we find a "volatile" page, it's better + * to let it get compressed rather than letting + * it occupy a full page until it gets purged. + * So no need to check for "volatile" here. + */ + } else if (object->purgable == VM_PURGABLE_VOLATILE) { + /* + * Avoid cleaning a "volatile" page which might + * be purged soon. + */ + + /* if it's wired, we can't put it on our queue */ + assert(!VM_PAGE_WIRED(m)); + + /* just stick it back on! */ + reactivated_this_call++; + + if (page_prev_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) { + VM_PAGEOUT_DEBUG(vm_pageout_cleaned_volatile_reactivated, 1); + } + + goto reactivate_page; + } + } + /* + * If it's being used, reactivate. + * (Fictitious pages are either busy or absent.) + * First, update the reference and dirty bits + * to make sure the page is unreferenced. + */ + refmod_state = -1; + + if (m->vmp_reference == FALSE && m->vmp_pmapped == TRUE) { + refmod_state = pmap_get_refmod(VM_PAGE_GET_PHYS_PAGE(m)); + + if (refmod_state & VM_MEM_REFERENCED) { + m->vmp_reference = TRUE; + } + if (refmod_state & VM_MEM_MODIFIED) { + SET_PAGE_DIRTY(m, FALSE); + } + } + + if (m->vmp_reference || m->vmp_dirty) { + /* deal with a rogue "reusable" page */ + VM_PAGEOUT_SCAN_HANDLE_REUSABLE_PAGE(m, m_object); + } + + if (vm_pageout_state.vm_page_xpmapped_min_divisor == 0) { + vm_pageout_state.vm_page_xpmapped_min = 0; + } else { + vm_pageout_state.vm_page_xpmapped_min = (vm_page_external_count * 10) / vm_pageout_state.vm_page_xpmapped_min_divisor; + } + + if (!m->vmp_no_cache && + page_from_bg_q == FALSE && + (m->vmp_reference || (m->vmp_xpmapped && !object->internal && + (vm_page_xpmapped_external_count < vm_pageout_state.vm_page_xpmapped_min)))) { + /* + * The page we pulled off the inactive list has + * been referenced. It is possible for other + * processors to be touching pages faster than we + * can clear the referenced bit and traverse the + * inactive queue, so we limit the number of + * reactivations. + */ + if (++reactivated_this_call >= reactivate_limit) { + vm_pageout_vminfo.vm_pageout_reactivation_limit_exceeded++; + } else if (++inactive_reclaim_run >= VM_PAGEOUT_INACTIVE_FORCE_RECLAIM) { + vm_pageout_vminfo.vm_pageout_inactive_force_reclaim++; + } else { + uint32_t isinuse; + + if (page_prev_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) { + VM_PAGEOUT_DEBUG(vm_pageout_cleaned_reference_reactivated, 1); + } + + vm_pageout_vminfo.vm_pageout_inactive_referenced++; +reactivate_page: + if (!object->internal && object->pager != MEMORY_OBJECT_NULL && + vnode_pager_get_isinuse(object->pager, &isinuse) == KERN_SUCCESS && !isinuse) { + /* + * no explict mappings of this object exist + * and it's not open via the filesystem + */ + vm_page_deactivate(m); + VM_PAGEOUT_DEBUG(vm_pageout_inactive_deactivated, 1); + } else { + /* + * The page was/is being used, so put back on active list. + */ + vm_page_activate(m); + VM_STAT_INCR(reactivations); + inactive_burst_count = 0; + } +#if CONFIG_BACKGROUND_QUEUE +#if DEVELOPMENT || DEBUG + if (page_from_bg_q == TRUE) { + if (m_object->internal) { + vm_pageout_rejected_bq_internal++; + } else { + vm_pageout_rejected_bq_external++; + } + } +#endif /* DEVELOPMENT || DEBUG */ +#endif /* CONFIG_BACKGROUND_QUEUE */ + + if (page_prev_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) { + VM_PAGEOUT_DEBUG(vm_pageout_cleaned_reactivated, 1); + } + vm_pageout_state.vm_pageout_inactive_used++; + + lock_yield_check = TRUE; continue; - valid_upls++; - if (!(UPL_PAGE_LIST_MAPPED & upl->flags)) - unmapped++; + } + /* + * Make sure we call pmap_get_refmod() if it + * wasn't already called just above, to update + * the dirty bit. + */ + if ((refmod_state == -1) && !m->vmp_dirty && m->vmp_pmapped) { + refmod_state = pmap_get_refmod(VM_PAGE_GET_PHYS_PAGE(m)); + if (refmod_state & VM_MEM_MODIFIED) { + SET_PAGE_DIRTY(m, FALSE); + } + } } - if(unmapped) { - if(unmapped != valid_upls) - panic("%d of the %d sub-upls within the Vector UPL is/are not mapped\n", unmapped, valid_upls); - else { - upl_unlock(vector_upl); - return KERN_FAILURE; + /* + * we've got a candidate page to steal... + * + * m->vmp_dirty is up to date courtesy of the + * preceding check for m->vmp_reference... if + * we get here, then m->vmp_reference had to be + * FALSE (or possibly "reactivate_limit" was + * exceeded), but in either case we called + * pmap_get_refmod() and updated both + * m->vmp_reference and m->vmp_dirty + * + * if it's dirty or precious we need to + * see if the target queue is throtttled + * it if is, we need to skip over it by moving it back + * to the end of the inactive queue + */ + + inactive_throttled = FALSE; + + if (m->vmp_dirty || m->vmp_precious) { + if (object->internal) { + if (VM_PAGE_Q_THROTTLED(iq)) { + inactive_throttled = TRUE; + } + } else if (VM_PAGE_Q_THROTTLED(eq)) { + inactive_throttled = TRUE; } } - curr_upl=0; - } - else - upl_lock(upl); +throttle_inactive: + if (!VM_DYNAMIC_PAGING_ENABLED() && + object->internal && m->vmp_dirty && + (object->purgable == VM_PURGABLE_DENY || + object->purgable == VM_PURGABLE_NONVOLATILE || + object->purgable == VM_PURGABLE_VOLATILE)) { + vm_page_check_pageable_safe(m); + assert(m->vmp_q_state == VM_PAGE_NOT_ON_Q); + vm_page_queue_enter(&vm_page_queue_throttled, m, vmp_pageq); + m->vmp_q_state = VM_PAGE_ON_THROTTLED_Q; + vm_page_throttled_count++; + + VM_PAGEOUT_DEBUG(vm_pageout_scan_reclaimed_throttled, 1); -process_upl_to_remove: - if(isVectorUPL) { - if(curr_upl == MAX_VECTOR_UPL_ELEMENTS) { - vm_map_t v_upl_submap; - vm_offset_t v_upl_submap_dst_addr; - vector_upl_get_submap(vector_upl, &v_upl_submap, &v_upl_submap_dst_addr); + inactive_burst_count = 0; + + lock_yield_check = TRUE; + continue; + } + if (inactive_throttled == TRUE) { + vps_deal_with_throttled_queues(m, &object, &vm_pageout_inactive_external_forced_reactivate_limit, + &delayed_unlock, &force_anonymous, page_from_bg_q); + + inactive_burst_count = 0; + + if (page_prev_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) { + VM_PAGEOUT_DEBUG(vm_pageout_cleaned_reactivated, 1); + } + + lock_yield_check = TRUE; + continue; + } + + /* + * we've got a page that we can steal... + * eliminate all mappings and make sure + * we have the up-to-date modified state + * + * if we need to do a pmap_disconnect then we + * need to re-evaluate m->vmp_dirty since the pmap_disconnect + * provides the true state atomically... the + * page was still mapped up to the pmap_disconnect + * and may have been dirtied at the last microsecond + * + * Note that if 'pmapped' is FALSE then the page is not + * and has not been in any map, so there is no point calling + * pmap_disconnect(). m->vmp_dirty could have been set in anticipation + * of likely usage of the page. + */ + if (m->vmp_pmapped == TRUE) { + int pmap_options; + + /* + * Don't count this page as going into the compressor + * if any of these are true: + * 1) compressed pager isn't enabled + * 2) Freezer enabled device with compressed pager + * backend (exclusive use) i.e. most of the VM system + * (including vm_pageout_scan) has no knowledge of + * the compressor + * 3) This page belongs to a file and hence will not be + * sent into the compressor + */ + if (!VM_CONFIG_COMPRESSOR_IS_ACTIVE || + object->internal == FALSE) { + pmap_options = 0; + } else if (m->vmp_dirty || m->vmp_precious) { + /* + * VM knows that this page is dirty (or + * precious) and needs to be compressed + * rather than freed. + * Tell the pmap layer to count this page + * as "compressed". + */ + pmap_options = PMAP_OPTIONS_COMPRESSOR; + } else { + /* + * VM does not know if the page needs to + * be preserved but the pmap layer might tell + * us if any mapping has "modified" it. + * Let's the pmap layer to count this page + * as compressed if and only if it has been + * modified. + */ + pmap_options = + PMAP_OPTIONS_COMPRESSOR_IFF_MODIFIED; + } + refmod_state = pmap_disconnect_options(VM_PAGE_GET_PHYS_PAGE(m), + pmap_options, + NULL); + if (refmod_state & VM_MEM_MODIFIED) { + SET_PAGE_DIRTY(m, FALSE); + } + } + + /* + * reset our count of pages that have been reclaimed + * since the last page was 'stolen' + */ + inactive_reclaim_run = 0; + + /* + * If it's clean and not precious, we can free the page. + */ + if (!m->vmp_dirty && !m->vmp_precious) { + vm_pageout_state.vm_pageout_inactive_clean++; + + /* + * OK, at this point we have found a page we are going to free. + */ +#if CONFIG_PHANTOM_CACHE + if (!object->internal) { + vm_phantom_cache_add_ghost(m); + } +#endif + goto reclaim_page; + } + + /* + * The page may have been dirtied since the last check + * for a throttled target queue (which may have been skipped + * if the page was clean then). With the dirty page + * disconnected here, we can make one final check. + */ + if (object->internal) { + if (VM_PAGE_Q_THROTTLED(iq)) { + inactive_throttled = TRUE; + } + } else if (VM_PAGE_Q_THROTTLED(eq)) { + inactive_throttled = TRUE; + } + + if (inactive_throttled == TRUE) { + goto throttle_inactive; + } + +#if VM_PRESSURE_EVENTS +#if CONFIG_JETSAM + + /* + * If Jetsam is enabled, then the sending + * of memory pressure notifications is handled + * from the same thread that takes care of high-water + * and other jetsams i.e. the memorystatus_thread. + */ + +#else /* CONFIG_JETSAM */ + + vm_pressure_response(); + +#endif /* CONFIG_JETSAM */ +#endif /* VM_PRESSURE_EVENTS */ + + if (page_prev_q_state == VM_PAGE_ON_SPECULATIVE_Q) { + VM_PAGEOUT_DEBUG(vm_pageout_speculative_dirty, 1); + } + + if (object->internal) { + vm_pageout_vminfo.vm_pageout_inactive_dirty_internal++; + } else { + vm_pageout_vminfo.vm_pageout_inactive_dirty_external++; + } + + /* + * internal pages will go to the compressor... + * external pages will go to the appropriate pager to be cleaned + * and upon completion will end up on 'vm_page_queue_cleaned' which + * is a preferred queue to steal from + */ + vm_pageout_cluster(m); + inactive_burst_count = 0; + + /* + * back to top of pageout scan loop + */ + } +} + + +void +vm_page_free_reserve( + int pages) +{ + int free_after_reserve; + + if (VM_CONFIG_COMPRESSOR_IS_PRESENT) { + if ((vm_page_free_reserved + pages + COMPRESSOR_FREE_RESERVED_LIMIT) >= (VM_PAGE_FREE_RESERVED_LIMIT + COMPRESSOR_FREE_RESERVED_LIMIT)) { + vm_page_free_reserved = VM_PAGE_FREE_RESERVED_LIMIT + COMPRESSOR_FREE_RESERVED_LIMIT; + } else { + vm_page_free_reserved += (pages + COMPRESSOR_FREE_RESERVED_LIMIT); + } + } else { + if ((vm_page_free_reserved + pages) >= VM_PAGE_FREE_RESERVED_LIMIT) { + vm_page_free_reserved = VM_PAGE_FREE_RESERVED_LIMIT; + } else { + vm_page_free_reserved += pages; + } + } + free_after_reserve = vm_pageout_state.vm_page_free_count_init - vm_page_free_reserved; + + vm_page_free_min = vm_page_free_reserved + + VM_PAGE_FREE_MIN(free_after_reserve); + + if (vm_page_free_min > VM_PAGE_FREE_MIN_LIMIT) { + vm_page_free_min = VM_PAGE_FREE_MIN_LIMIT; + } + + vm_page_free_target = vm_page_free_reserved + + VM_PAGE_FREE_TARGET(free_after_reserve); + + if (vm_page_free_target > VM_PAGE_FREE_TARGET_LIMIT) { + vm_page_free_target = VM_PAGE_FREE_TARGET_LIMIT; + } + + if (vm_page_free_target < vm_page_free_min + 5) { + vm_page_free_target = vm_page_free_min + 5; + } + + vm_page_throttle_limit = vm_page_free_target - (vm_page_free_target / 2); +} + +/* + * vm_pageout is the high level pageout daemon. + */ + +void +vm_pageout_continue(void) +{ + DTRACE_VM2(pgrrun, int, 1, (uint64_t *), NULL); + VM_PAGEOUT_DEBUG(vm_pageout_scan_event_counter, 1); + + lck_mtx_lock(&vm_page_queue_free_lock); + vm_pageout_running = TRUE; + lck_mtx_unlock(&vm_page_queue_free_lock); + + vm_pageout_scan(); + /* + * we hold both the vm_page_queue_free_lock + * and the vm_page_queues_lock at this point + */ + assert(vm_page_free_wanted == 0); + assert(vm_page_free_wanted_privileged == 0); + assert_wait((event_t) &vm_page_free_wanted, THREAD_UNINT); + + vm_pageout_running = FALSE; +#if !CONFIG_EMBEDDED + if (vm_pageout_waiter) { + vm_pageout_waiter = FALSE; + thread_wakeup((event_t)&vm_pageout_waiter); + } +#endif /* !CONFIG_EMBEDDED */ + + lck_mtx_unlock(&vm_page_queue_free_lock); + vm_page_unlock_queues(); + + counter(c_vm_pageout_block++); + thread_block((thread_continue_t)vm_pageout_continue); + /*NOTREACHED*/ +} + +#if !CONFIG_EMBEDDED +kern_return_t +vm_pageout_wait(uint64_t deadline) +{ + kern_return_t kr; + + lck_mtx_lock(&vm_page_queue_free_lock); + for (kr = KERN_SUCCESS; vm_pageout_running && (KERN_SUCCESS == kr);) { + vm_pageout_waiter = TRUE; + if (THREAD_AWAKENED != lck_mtx_sleep_deadline( + &vm_page_queue_free_lock, LCK_SLEEP_DEFAULT, + (event_t) &vm_pageout_waiter, THREAD_UNINT, deadline)) { + kr = KERN_OPERATION_TIMED_OUT; + } + } + lck_mtx_unlock(&vm_page_queue_free_lock); + + return kr; +} +#endif /* !CONFIG_EMBEDDED */ + + +static void +vm_pageout_iothread_external_continue(struct vm_pageout_queue *q) +{ + vm_page_t m = NULL; + vm_object_t object; + vm_object_offset_t offset; + memory_object_t pager; + + /* On systems with a compressor, the external IO thread clears its + * VM privileged bit to accommodate large allocations (e.g. bulk UPL + * creation) + */ + if (vm_pageout_state.vm_pageout_internal_iothread != THREAD_NULL) { + current_thread()->options &= ~TH_OPT_VMPRIV; + } + + vm_page_lockspin_queues(); + + while (!vm_page_queue_empty(&q->pgo_pending)) { + q->pgo_busy = TRUE; + vm_page_queue_remove_first(&q->pgo_pending, m, vmp_pageq); + + assert(m->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q); + VM_PAGE_CHECK(m); + /* + * grab a snapshot of the object and offset this + * page is tabled in so that we can relookup this + * page after we've taken the object lock - these + * fields are stable while we hold the page queues lock + * but as soon as we drop it, there is nothing to keep + * this page in this object... we hold an activity_in_progress + * on this object which will keep it from terminating + */ + object = VM_PAGE_OBJECT(m); + offset = m->vmp_offset; + + m->vmp_q_state = VM_PAGE_NOT_ON_Q; + VM_PAGE_ZERO_PAGEQ_ENTRY(m); + + vm_page_unlock_queues(); + + vm_object_lock(object); + + m = vm_page_lookup(object, offset); + + if (m == NULL || m->vmp_busy || m->vmp_cleaning || + !m->vmp_laundry || (m->vmp_q_state != VM_PAGE_NOT_ON_Q)) { + /* + * it's either the same page that someone else has + * started cleaning (or it's finished cleaning or + * been put back on the pageout queue), or + * the page has been freed or we have found a + * new page at this offset... in all of these cases + * we merely need to release the activity_in_progress + * we took when we put the page on the pageout queue + */ + vm_object_activity_end(object); + vm_object_unlock(object); + + vm_page_lockspin_queues(); + continue; + } + pager = object->pager; + + if (pager == MEMORY_OBJECT_NULL) { + /* + * This pager has been destroyed by either + * memory_object_destroy or vm_object_destroy, and + * so there is nowhere for the page to go. + */ + if (m->vmp_free_when_done) { + /* + * Just free the page... VM_PAGE_FREE takes + * care of cleaning up all the state... + * including doing the vm_pageout_throttle_up + */ + VM_PAGE_FREE(m); + } else { + vm_page_lockspin_queues(); + + vm_pageout_throttle_up(m); + vm_page_activate(m); + + vm_page_unlock_queues(); + + /* + * And we are done with it. + */ + } + vm_object_activity_end(object); + vm_object_unlock(object); + + vm_page_lockspin_queues(); + continue; + } +#if 0 + /* + * we don't hold the page queue lock + * so this check isn't safe to make + */ + VM_PAGE_CHECK(m); +#endif + /* + * give back the activity_in_progress reference we + * took when we queued up this page and replace it + * it with a paging_in_progress reference that will + * also hold the paging offset from changing and + * prevent the object from terminating + */ + vm_object_activity_end(object); + vm_object_paging_begin(object); + vm_object_unlock(object); + + /* + * Send the data to the pager. + * any pageout clustering happens there + */ + memory_object_data_return(pager, + m->vmp_offset + object->paging_offset, + PAGE_SIZE, + NULL, + NULL, + FALSE, + FALSE, + 0); + + vm_object_lock(object); + vm_object_paging_end(object); + vm_object_unlock(object); + + vm_pageout_io_throttle(); + + vm_page_lockspin_queues(); + } + q->pgo_busy = FALSE; + q->pgo_idle = TRUE; + + assert_wait((event_t) &q->pgo_pending, THREAD_UNINT); + vm_page_unlock_queues(); + + thread_block_parameter((thread_continue_t)vm_pageout_iothread_external_continue, (void *) q); + /*NOTREACHED*/ +} + + +#define MAX_FREE_BATCH 32 +uint32_t vm_compressor_time_thread; /* Set via sysctl to record time accrued by + * this thread. + */ + + +void +vm_pageout_iothread_internal_continue(struct cq *); +void +vm_pageout_iothread_internal_continue(struct cq *cq) +{ + struct vm_pageout_queue *q; + vm_page_t m = NULL; + boolean_t pgo_draining; + vm_page_t local_q; + int local_cnt; + vm_page_t local_freeq = NULL; + int local_freed = 0; + int local_batch_size; +#if DEVELOPMENT || DEBUG + int ncomps = 0; + boolean_t marked_active = FALSE; +#endif + KERNEL_DEBUG(0xe040000c | DBG_FUNC_END, 0, 0, 0, 0, 0); + + q = cq->q; +#if __AMP__ + if (vm_compressor_ebound && (vm_pageout_state.vm_compressor_thread_count > 1)) { + local_batch_size = (q->pgo_maxlaundry >> 3); + local_batch_size = MAX(local_batch_size, 16); + } else { + local_batch_size = q->pgo_maxlaundry / (vm_pageout_state.vm_compressor_thread_count * 2); + } +#else + local_batch_size = q->pgo_maxlaundry / (vm_pageout_state.vm_compressor_thread_count * 2); +#endif + +#if RECORD_THE_COMPRESSED_DATA + if (q->pgo_laundry) { + c_compressed_record_init(); + } +#endif + while (TRUE) { + int pages_left_on_q = 0; + + local_cnt = 0; + local_q = NULL; + + KERNEL_DEBUG(0xe0400014 | DBG_FUNC_START, 0, 0, 0, 0, 0); + + vm_page_lock_queues(); +#if DEVELOPMENT || DEBUG + if (marked_active == FALSE) { + vmct_active++; + vmct_state[cq->id] = VMCT_ACTIVE; + marked_active = TRUE; + if (vmct_active == 1) { + vm_compressor_epoch_start = mach_absolute_time(); + } + } +#endif + KERNEL_DEBUG(0xe0400014 | DBG_FUNC_END, 0, 0, 0, 0, 0); + + KERNEL_DEBUG(0xe0400018 | DBG_FUNC_START, q->pgo_laundry, 0, 0, 0, 0); + + while (!vm_page_queue_empty(&q->pgo_pending) && local_cnt < local_batch_size) { + vm_page_queue_remove_first(&q->pgo_pending, m, vmp_pageq); + assert(m->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q); + VM_PAGE_CHECK(m); + + m->vmp_q_state = VM_PAGE_NOT_ON_Q; + VM_PAGE_ZERO_PAGEQ_ENTRY(m); + m->vmp_laundry = FALSE; + + m->vmp_snext = local_q; + local_q = m; + local_cnt++; + } + if (local_q == NULL) { + break; + } + + q->pgo_busy = TRUE; + + if ((pgo_draining = q->pgo_draining) == FALSE) { + vm_pageout_throttle_up_batch(q, local_cnt); + pages_left_on_q = q->pgo_laundry; + } else { + pages_left_on_q = q->pgo_laundry - local_cnt; + } + + vm_page_unlock_queues(); + +#if !RECORD_THE_COMPRESSED_DATA + if (pages_left_on_q >= local_batch_size && cq->id < (vm_pageout_state.vm_compressor_thread_count - 1)) { + thread_wakeup((event_t) ((uintptr_t)&q->pgo_pending + cq->id + 1)); + } +#endif + KERNEL_DEBUG(0xe0400018 | DBG_FUNC_END, q->pgo_laundry, 0, 0, 0, 0); + + while (local_q) { + KERNEL_DEBUG(0xe0400024 | DBG_FUNC_START, local_cnt, 0, 0, 0, 0); + + m = local_q; + local_q = m->vmp_snext; + m->vmp_snext = NULL; + + if (vm_pageout_compress_page(&cq->current_chead, cq->scratch_buf, m) == KERN_SUCCESS) { +#if DEVELOPMENT || DEBUG + ncomps++; +#endif + KERNEL_DEBUG(0xe0400024 | DBG_FUNC_END, local_cnt, 0, 0, 0, 0); + + m->vmp_snext = local_freeq; + local_freeq = m; + local_freed++; + + if (local_freed >= MAX_FREE_BATCH) { + OSAddAtomic64(local_freed, &vm_pageout_vminfo.vm_pageout_compressions); + + vm_page_free_list(local_freeq, TRUE); + + local_freeq = NULL; + local_freed = 0; + } + } +#if !CONFIG_JETSAM + while (vm_page_free_count < COMPRESSOR_FREE_RESERVED_LIMIT) { + kern_return_t wait_result; + int need_wakeup = 0; + + if (local_freeq) { + OSAddAtomic64(local_freed, &vm_pageout_vminfo.vm_pageout_compressions); + + vm_page_free_list(local_freeq, TRUE); + local_freeq = NULL; + local_freed = 0; + + continue; + } + lck_mtx_lock_spin(&vm_page_queue_free_lock); + + if (vm_page_free_count < COMPRESSOR_FREE_RESERVED_LIMIT) { + if (vm_page_free_wanted_privileged++ == 0) { + need_wakeup = 1; + } + wait_result = assert_wait((event_t)&vm_page_free_wanted_privileged, THREAD_UNINT); + + lck_mtx_unlock(&vm_page_queue_free_lock); + + if (need_wakeup) { + thread_wakeup((event_t)&vm_page_free_wanted); + } + + if (wait_result == THREAD_WAITING) { + thread_block(THREAD_CONTINUE_NULL); + } + } else { + lck_mtx_unlock(&vm_page_queue_free_lock); + } + } +#endif + } + if (local_freeq) { + OSAddAtomic64(local_freed, &vm_pageout_vminfo.vm_pageout_compressions); + + vm_page_free_list(local_freeq, TRUE); + local_freeq = NULL; + local_freed = 0; + } + if (pgo_draining == TRUE) { + vm_page_lockspin_queues(); + vm_pageout_throttle_up_batch(q, local_cnt); + vm_page_unlock_queues(); + } + } + KERNEL_DEBUG(0xe040000c | DBG_FUNC_START, 0, 0, 0, 0, 0); + + /* + * queue lock is held and our q is empty + */ + q->pgo_busy = FALSE; + q->pgo_idle = TRUE; + + assert_wait((event_t) ((uintptr_t)&q->pgo_pending + cq->id), THREAD_UNINT); +#if DEVELOPMENT || DEBUG + if (marked_active == TRUE) { + vmct_active--; + vmct_state[cq->id] = VMCT_IDLE; + + if (vmct_active == 0) { + vm_compressor_epoch_stop = mach_absolute_time(); + assertf(vm_compressor_epoch_stop >= vm_compressor_epoch_start, + "Compressor epoch non-monotonic: 0x%llx -> 0x%llx", + vm_compressor_epoch_start, vm_compressor_epoch_stop); + /* This interval includes intervals where one or more + * compressor threads were pre-empted + */ + vmct_stats.vmct_cthreads_total += vm_compressor_epoch_stop - vm_compressor_epoch_start; + } + } +#endif + vm_page_unlock_queues(); +#if DEVELOPMENT || DEBUG + if (__improbable(vm_compressor_time_thread)) { + vmct_stats.vmct_runtimes[cq->id] = thread_get_runtime_self(); + vmct_stats.vmct_pages[cq->id] += ncomps; + vmct_stats.vmct_iterations[cq->id]++; + if (ncomps > vmct_stats.vmct_maxpages[cq->id]) { + vmct_stats.vmct_maxpages[cq->id] = ncomps; + } + if (ncomps < vmct_stats.vmct_minpages[cq->id]) { + vmct_stats.vmct_minpages[cq->id] = ncomps; + } + } +#endif + + KERNEL_DEBUG(0xe0400018 | DBG_FUNC_END, 0, 0, 0, 0, 0); + + thread_block_parameter((thread_continue_t)vm_pageout_iothread_internal_continue, (void *) cq); + /*NOTREACHED*/ +} + + +kern_return_t +vm_pageout_compress_page(void **current_chead, char *scratch_buf, vm_page_t m) +{ + vm_object_t object; + memory_object_t pager; + int compressed_count_delta; + kern_return_t retval; + + object = VM_PAGE_OBJECT(m); + + assert(!m->vmp_free_when_done); + assert(!m->vmp_laundry); + + pager = object->pager; + + if (!object->pager_initialized || pager == MEMORY_OBJECT_NULL) { + KERNEL_DEBUG(0xe0400010 | DBG_FUNC_START, object, pager, 0, 0, 0); + + vm_object_lock(object); + + /* + * If there is no memory object for the page, create + * one and hand it to the compression pager. + */ + + if (!object->pager_initialized) { + vm_object_collapse(object, (vm_object_offset_t) 0, TRUE); + } + if (!object->pager_initialized) { + vm_object_compressor_pager_create(object); + } + + pager = object->pager; + + if (!object->pager_initialized || pager == MEMORY_OBJECT_NULL) { + /* + * Still no pager for the object, + * or the pager has been destroyed. + * Reactivate the page. + * + * Should only happen if there is no + * compression pager + */ + PAGE_WAKEUP_DONE(m); + + vm_page_lockspin_queues(); + vm_page_activate(m); + VM_PAGEOUT_DEBUG(vm_pageout_dirty_no_pager, 1); + vm_page_unlock_queues(); + + /* + * And we are done with it. + */ + vm_object_activity_end(object); + vm_object_unlock(object); + + return KERN_FAILURE; + } + vm_object_unlock(object); + + KERNEL_DEBUG(0xe0400010 | DBG_FUNC_END, object, pager, 0, 0, 0); + } + assert(object->pager_initialized && pager != MEMORY_OBJECT_NULL); + assert(object->activity_in_progress > 0); + + retval = vm_compressor_pager_put( + pager, + m->vmp_offset + object->paging_offset, + VM_PAGE_GET_PHYS_PAGE(m), + current_chead, + scratch_buf, + &compressed_count_delta); + + vm_object_lock(object); + + assert(object->activity_in_progress > 0); + assert(VM_PAGE_OBJECT(m) == object); + assert( !VM_PAGE_WIRED(m)); + + vm_compressor_pager_count(pager, + compressed_count_delta, + FALSE, /* shared_lock */ + object); + + if (retval == KERN_SUCCESS) { + /* + * If the object is purgeable, its owner's + * purgeable ledgers will be updated in + * vm_page_remove() but the page still + * contributes to the owner's memory footprint, + * so account for it as such. + */ + if ((object->purgable != VM_PURGABLE_DENY || + object->vo_ledger_tag) && + object->vo_owner != NULL) { + /* one more compressed purgeable/tagged page */ + vm_object_owner_compressed_update(object, + +1); + } + VM_STAT_INCR(compressions); + + if (m->vmp_tabled) { + vm_page_remove(m, TRUE); + } + } else { + PAGE_WAKEUP_DONE(m); + + vm_page_lockspin_queues(); + + vm_page_activate(m); + vm_pageout_vminfo.vm_compressor_failed++; + + vm_page_unlock_queues(); + } + vm_object_activity_end(object); + vm_object_unlock(object); + + return retval; +} + + +static void +vm_pageout_adjust_eq_iothrottle(struct vm_pageout_queue *eq, boolean_t req_lowpriority) +{ + uint32_t policy; + + if (hibernate_cleaning_in_progress == TRUE) { + req_lowpriority = FALSE; + } + + if (eq->pgo_inited == TRUE && eq->pgo_lowpriority != req_lowpriority) { + vm_page_unlock_queues(); + + if (req_lowpriority == TRUE) { + policy = THROTTLE_LEVEL_PAGEOUT_THROTTLED; + DTRACE_VM(laundrythrottle); + } else { + policy = THROTTLE_LEVEL_PAGEOUT_UNTHROTTLED; + DTRACE_VM(laundryunthrottle); + } + proc_set_thread_policy_with_tid(kernel_task, eq->pgo_tid, + TASK_POLICY_EXTERNAL, TASK_POLICY_IO, policy); + + vm_page_lock_queues(); + eq->pgo_lowpriority = req_lowpriority; + } +} + + +static void +vm_pageout_iothread_external(void) +{ + thread_t self = current_thread(); + + self->options |= TH_OPT_VMPRIV; + + DTRACE_VM2(laundrythrottle, int, 1, (uint64_t *), NULL); + + proc_set_thread_policy(self, TASK_POLICY_EXTERNAL, + TASK_POLICY_IO, THROTTLE_LEVEL_PAGEOUT_THROTTLED); + + vm_page_lock_queues(); + + vm_pageout_queue_external.pgo_tid = self->thread_id; + vm_pageout_queue_external.pgo_lowpriority = TRUE; + vm_pageout_queue_external.pgo_inited = TRUE; + + vm_page_unlock_queues(); + + vm_pageout_iothread_external_continue(&vm_pageout_queue_external); + + /*NOTREACHED*/ +} + + +static void +vm_pageout_iothread_internal(struct cq *cq) +{ + thread_t self = current_thread(); + + self->options |= TH_OPT_VMPRIV; + + vm_page_lock_queues(); + + vm_pageout_queue_internal.pgo_tid = self->thread_id; + vm_pageout_queue_internal.pgo_lowpriority = TRUE; + vm_pageout_queue_internal.pgo_inited = TRUE; + + vm_page_unlock_queues(); + + if (vm_pageout_state.vm_restricted_to_single_processor == TRUE) { + thread_vm_bind_group_add(); + } + +#if CONFIG_THREAD_GROUPS + thread_group_vm_add(); +#endif /* CONFIG_THREAD_GROUPS */ + +#if __AMP__ + if (vm_compressor_ebound) { + /* + * Use the soft bound option for vm_compressor to allow it to run on + * P-cores if E-cluster is unavailable. + */ + thread_bind_cluster_type(self, 'E', true); + } +#endif /* __AMP__ */ + + thread_set_thread_name(current_thread(), "VM_compressor"); +#if DEVELOPMENT || DEBUG + vmct_stats.vmct_minpages[cq->id] = INT32_MAX; +#endif + vm_pageout_iothread_internal_continue(cq); + + /*NOTREACHED*/ +} + +kern_return_t +vm_set_buffer_cleanup_callout(boolean_t (*func)(int)) +{ + if (OSCompareAndSwapPtr(NULL, ptrauth_nop_cast(void *, func), (void * volatile *) &consider_buffer_cache_collect)) { + return KERN_SUCCESS; + } else { + return KERN_FAILURE; /* Already set */ + } +} + +extern boolean_t memorystatus_manual_testing_on; +extern unsigned int memorystatus_level; + + +#if VM_PRESSURE_EVENTS + +boolean_t vm_pressure_events_enabled = FALSE; + +void +vm_pressure_response(void) +{ + vm_pressure_level_t old_level = kVMPressureNormal; + int new_level = -1; + unsigned int total_pages; + uint64_t available_memory = 0; + + if (vm_pressure_events_enabled == FALSE) { + return; + } + +#if CONFIG_EMBEDDED + + available_memory = (uint64_t) memorystatus_available_pages; + +#else /* CONFIG_EMBEDDED */ + + available_memory = (uint64_t) AVAILABLE_NON_COMPRESSED_MEMORY; + memorystatus_available_pages = (uint64_t) AVAILABLE_NON_COMPRESSED_MEMORY; + +#endif /* CONFIG_EMBEDDED */ + + total_pages = (unsigned int) atop_64(max_mem); +#if CONFIG_SECLUDED_MEMORY + total_pages -= vm_page_secluded_count; +#endif /* CONFIG_SECLUDED_MEMORY */ + memorystatus_level = (unsigned int) ((available_memory * 100) / total_pages); + + if (memorystatus_manual_testing_on) { + return; + } + + old_level = memorystatus_vm_pressure_level; + + switch (memorystatus_vm_pressure_level) { + case kVMPressureNormal: + { + if (VM_PRESSURE_WARNING_TO_CRITICAL()) { + new_level = kVMPressureCritical; + } else if (VM_PRESSURE_NORMAL_TO_WARNING()) { + new_level = kVMPressureWarning; + } + break; + } + + case kVMPressureWarning: + case kVMPressureUrgent: + { + if (VM_PRESSURE_WARNING_TO_NORMAL()) { + new_level = kVMPressureNormal; + } else if (VM_PRESSURE_WARNING_TO_CRITICAL()) { + new_level = kVMPressureCritical; + } + break; + } + + case kVMPressureCritical: + { + if (VM_PRESSURE_WARNING_TO_NORMAL()) { + new_level = kVMPressureNormal; + } else if (VM_PRESSURE_CRITICAL_TO_WARNING()) { + new_level = kVMPressureWarning; + } + break; + } + + default: + return; + } + + if (new_level != -1) { + memorystatus_vm_pressure_level = (vm_pressure_level_t) new_level; + + if (new_level != (int) old_level) { + VM_DEBUG_CONSTANT_EVENT(vm_pressure_level_change, VM_PRESSURE_LEVEL_CHANGE, DBG_FUNC_NONE, + new_level, old_level, 0, 0); + } + + if ((memorystatus_vm_pressure_level != kVMPressureNormal) || (old_level != memorystatus_vm_pressure_level)) { + if (vm_pageout_state.vm_pressure_thread_running == FALSE) { + thread_wakeup(&vm_pressure_thread); + } + + if (old_level != memorystatus_vm_pressure_level) { + thread_wakeup(&vm_pageout_state.vm_pressure_changed); + } + } + } +} +#endif /* VM_PRESSURE_EVENTS */ + +/* + * Function called by a kernel thread to either get the current pressure level or + * wait until memory pressure changes from a given level. + */ +kern_return_t +mach_vm_pressure_level_monitor(__unused boolean_t wait_for_pressure, __unused unsigned int *pressure_level) +{ +#if !VM_PRESSURE_EVENTS + + return KERN_FAILURE; + +#else /* VM_PRESSURE_EVENTS */ + + wait_result_t wr = 0; + vm_pressure_level_t old_level = memorystatus_vm_pressure_level; + + if (pressure_level == NULL) { + return KERN_INVALID_ARGUMENT; + } + + if (*pressure_level == kVMPressureJetsam) { + if (!wait_for_pressure) { + return KERN_INVALID_ARGUMENT; + } + + lck_mtx_lock(&memorystatus_jetsam_fg_band_lock); + wr = assert_wait((event_t)&memorystatus_jetsam_fg_band_waiters, + THREAD_INTERRUPTIBLE); + if (wr == THREAD_WAITING) { + ++memorystatus_jetsam_fg_band_waiters; + lck_mtx_unlock(&memorystatus_jetsam_fg_band_lock); + wr = thread_block(THREAD_CONTINUE_NULL); + } else { + lck_mtx_unlock(&memorystatus_jetsam_fg_band_lock); + } + if (wr != THREAD_AWAKENED) { + return KERN_ABORTED; + } + *pressure_level = kVMPressureJetsam; + return KERN_SUCCESS; + } + + if (wait_for_pressure == TRUE) { + while (old_level == *pressure_level) { + wr = assert_wait((event_t) &vm_pageout_state.vm_pressure_changed, + THREAD_INTERRUPTIBLE); + if (wr == THREAD_WAITING) { + wr = thread_block(THREAD_CONTINUE_NULL); + } + if (wr == THREAD_INTERRUPTED) { + return KERN_ABORTED; + } + + if (wr == THREAD_AWAKENED) { + old_level = memorystatus_vm_pressure_level; + } + } + } + + *pressure_level = old_level; + return KERN_SUCCESS; +#endif /* VM_PRESSURE_EVENTS */ +} + +#if VM_PRESSURE_EVENTS +void +vm_pressure_thread(void) +{ + static boolean_t thread_initialized = FALSE; + + if (thread_initialized == TRUE) { + vm_pageout_state.vm_pressure_thread_running = TRUE; + consider_vm_pressure_events(); + vm_pageout_state.vm_pressure_thread_running = FALSE; + } + + thread_set_thread_name(current_thread(), "VM_pressure"); + thread_initialized = TRUE; + assert_wait((event_t) &vm_pressure_thread, THREAD_UNINT); + thread_block((thread_continue_t)vm_pressure_thread); +} +#endif /* VM_PRESSURE_EVENTS */ + + +/* + * called once per-second via "compute_averages" + */ +void +compute_pageout_gc_throttle(__unused void *arg) +{ + if (vm_pageout_vminfo.vm_pageout_considered_page != vm_pageout_state.vm_pageout_considered_page_last) { + vm_pageout_state.vm_pageout_considered_page_last = vm_pageout_vminfo.vm_pageout_considered_page; + + thread_wakeup((event_t) &vm_pageout_garbage_collect); + } +} + +/* + * vm_pageout_garbage_collect can also be called when the zone allocator needs + * to call zone_gc on a different thread in order to trigger zone-map-exhaustion + * jetsams. We need to check if the zone map size is above its jetsam limit to + * decide if this was indeed the case. + * + * We need to do this on a different thread because of the following reasons: + * + * 1. In the case of synchronous jetsams, the leaking process can try to jetsam + * itself causing the system to hang. We perform synchronous jetsams if we're + * leaking in the VM map entries zone, so the leaking process could be doing a + * zalloc for a VM map entry while holding its vm_map lock, when it decides to + * jetsam itself. We also need the vm_map lock on the process termination path, + * which would now lead the dying process to deadlock against itself. + * + * 2. The jetsam path might need to allocate zone memory itself. We could try + * using the non-blocking variant of zalloc for this path, but we can still + * end up trying to do a kernel_memory_allocate when the zone maps are almost + * full. + */ + +void +vm_pageout_garbage_collect(int collect) +{ + if (collect) { + if (is_zone_map_nearing_exhaustion()) { + /* + * Woken up by the zone allocator for zone-map-exhaustion jetsams. + * + * Bail out after calling zone_gc (which triggers the + * zone-map-exhaustion jetsams). If we fall through, the subsequent + * operations that clear out a bunch of caches might allocate zone + * memory themselves (for eg. vm_map operations would need VM map + * entries). Since the zone map is almost full at this point, we + * could end up with a panic. We just need to quickly jetsam a + * process and exit here. + * + * It could so happen that we were woken up to relieve memory + * pressure and the zone map also happened to be near its limit at + * the time, in which case we'll skip out early. But that should be + * ok; if memory pressure persists, the thread will simply be woken + * up again. + */ + consider_zone_gc(TRUE); + } else { + /* Woken up by vm_pageout_scan or compute_pageout_gc_throttle. */ + boolean_t buf_large_zfree = FALSE; + boolean_t first_try = TRUE; + + stack_collect(); + + consider_machine_collect(); + mbuf_drain(FALSE); + + do { + if (consider_buffer_cache_collect != NULL) { + buf_large_zfree = (*consider_buffer_cache_collect)(0); + } + if (first_try == TRUE || buf_large_zfree == TRUE) { + /* + * consider_zone_gc should be last, because the other operations + * might return memory to zones. + */ + consider_zone_gc(FALSE); + } + first_try = FALSE; + } while (buf_large_zfree == TRUE && vm_page_free_count < vm_page_free_target); + + consider_machine_adjust(); + } + } + + assert_wait((event_t) &vm_pageout_garbage_collect, THREAD_UNINT); + + thread_block_parameter((thread_continue_t) vm_pageout_garbage_collect, (void *)1); + /*NOTREACHED*/ +} + + +#if VM_PAGE_BUCKETS_CHECK +#if VM_PAGE_FAKE_BUCKETS +extern vm_map_offset_t vm_page_fake_buckets_start, vm_page_fake_buckets_end; +#endif /* VM_PAGE_FAKE_BUCKETS */ +#endif /* VM_PAGE_BUCKETS_CHECK */ + + + +void +vm_set_restrictions(unsigned int num_cpus) +{ + int vm_restricted_to_single_processor = 0; + + if (PE_parse_boot_argn("vm_restricted_to_single_processor", &vm_restricted_to_single_processor, sizeof(vm_restricted_to_single_processor))) { + kprintf("Overriding vm_restricted_to_single_processor to %d\n", vm_restricted_to_single_processor); + vm_pageout_state.vm_restricted_to_single_processor = (vm_restricted_to_single_processor ? TRUE : FALSE); + } else { + assert(num_cpus > 0); + + if (num_cpus <= 3) { + /* + * on systems with a limited number of CPUS, bind the + * 4 major threads that can free memory and that tend to use + * a fair bit of CPU under pressured conditions to a single processor. + * This insures that these threads don't hog all of the available CPUs + * (important for camera launch), while allowing them to run independently + * w/r to locks... the 4 threads are + * vm_pageout_scan, vm_pageout_iothread_internal (compressor), + * vm_compressor_swap_trigger_thread (minor and major compactions), + * memorystatus_thread (jetsams). + * + * the first time the thread is run, it is responsible for checking the + * state of vm_restricted_to_single_processor, and if TRUE it calls + * thread_bind_master... someday this should be replaced with a group + * scheduling mechanism and KPI. + */ + vm_pageout_state.vm_restricted_to_single_processor = TRUE; + } else { + vm_pageout_state.vm_restricted_to_single_processor = FALSE; + } + } +} + +void +vm_pageout(void) +{ + thread_t self = current_thread(); + thread_t thread; + kern_return_t result; + spl_t s; + + /* + * Set thread privileges. + */ + s = splsched(); + + vm_pageout_scan_thread = self; + +#if CONFIG_VPS_DYNAMIC_PRIO + + int vps_dynprio_bootarg = 0; + + if (PE_parse_boot_argn("vps_dynamic_priority_enabled", &vps_dynprio_bootarg, sizeof(vps_dynprio_bootarg))) { + vps_dynamic_priority_enabled = (vps_dynprio_bootarg ? TRUE : FALSE); + kprintf("Overriding vps_dynamic_priority_enabled to %d\n", vps_dynamic_priority_enabled); + } else { + if (vm_pageout_state.vm_restricted_to_single_processor == TRUE) { + vps_dynamic_priority_enabled = TRUE; + } else { + vps_dynamic_priority_enabled = FALSE; + } + } + + if (vps_dynamic_priority_enabled) { + sched_set_kernel_thread_priority(self, MAXPRI_THROTTLE); + thread_set_eager_preempt(self); + } else { + sched_set_kernel_thread_priority(self, BASEPRI_VM); + } + +#else /* CONFIG_VPS_DYNAMIC_PRIO */ + + vps_dynamic_priority_enabled = FALSE; + sched_set_kernel_thread_priority(self, BASEPRI_VM); + +#endif /* CONFIG_VPS_DYNAMIC_PRIO */ + + thread_lock(self); + self->options |= TH_OPT_VMPRIV; + thread_unlock(self); + + if (!self->reserved_stack) { + self->reserved_stack = self->kernel_stack; + } + + if (vm_pageout_state.vm_restricted_to_single_processor == TRUE && + vps_dynamic_priority_enabled == FALSE) { + thread_vm_bind_group_add(); + } + + +#if CONFIG_THREAD_GROUPS + thread_group_vm_add(); +#endif /* CONFIG_THREAD_GROUPS */ + +#if __AMP__ + PE_parse_boot_argn("vmpgo_pcluster", &vm_pgo_pbound, sizeof(vm_pgo_pbound)); + if (vm_pgo_pbound) { + /* + * Use the soft bound option for vm pageout to allow it to run on + * E-cores if P-cluster is unavailable. + */ + thread_bind_cluster_type(self, 'P', true); + } +#endif /* __AMP__ */ + + splx(s); + + thread_set_thread_name(current_thread(), "VM_pageout_scan"); + + /* + * Initialize some paging parameters. + */ + + vm_pageout_state.vm_pressure_thread_running = FALSE; + vm_pageout_state.vm_pressure_changed = FALSE; + vm_pageout_state.memorystatus_purge_on_warning = 2; + vm_pageout_state.memorystatus_purge_on_urgent = 5; + vm_pageout_state.memorystatus_purge_on_critical = 8; + vm_pageout_state.vm_page_speculative_q_age_ms = VM_PAGE_SPECULATIVE_Q_AGE_MS; + vm_pageout_state.vm_page_speculative_percentage = 5; + vm_pageout_state.vm_page_speculative_target = 0; + + vm_pageout_state.vm_pageout_external_iothread = THREAD_NULL; + vm_pageout_state.vm_pageout_internal_iothread = THREAD_NULL; + + vm_pageout_state.vm_pageout_swap_wait = 0; + vm_pageout_state.vm_pageout_idle_wait = 0; + vm_pageout_state.vm_pageout_empty_wait = 0; + vm_pageout_state.vm_pageout_burst_wait = 0; + vm_pageout_state.vm_pageout_deadlock_wait = 0; + vm_pageout_state.vm_pageout_deadlock_relief = 0; + vm_pageout_state.vm_pageout_burst_inactive_throttle = 0; + + vm_pageout_state.vm_pageout_inactive = 0; + vm_pageout_state.vm_pageout_inactive_used = 0; + vm_pageout_state.vm_pageout_inactive_clean = 0; + + vm_pageout_state.vm_memory_pressure = 0; + vm_pageout_state.vm_page_filecache_min = 0; +#if CONFIG_JETSAM + vm_pageout_state.vm_page_filecache_min_divisor = 70; + vm_pageout_state.vm_page_xpmapped_min_divisor = 40; +#else + vm_pageout_state.vm_page_filecache_min_divisor = 27; + vm_pageout_state.vm_page_xpmapped_min_divisor = 36; +#endif + vm_pageout_state.vm_page_free_count_init = vm_page_free_count; + + vm_pageout_state.vm_pageout_considered_page_last = 0; + + if (vm_pageout_state.vm_pageout_swap_wait == 0) { + vm_pageout_state.vm_pageout_swap_wait = VM_PAGEOUT_SWAP_WAIT; + } + + if (vm_pageout_state.vm_pageout_idle_wait == 0) { + vm_pageout_state.vm_pageout_idle_wait = VM_PAGEOUT_IDLE_WAIT; + } + + if (vm_pageout_state.vm_pageout_burst_wait == 0) { + vm_pageout_state.vm_pageout_burst_wait = VM_PAGEOUT_BURST_WAIT; + } + + if (vm_pageout_state.vm_pageout_empty_wait == 0) { + vm_pageout_state.vm_pageout_empty_wait = VM_PAGEOUT_EMPTY_WAIT; + } + + if (vm_pageout_state.vm_pageout_deadlock_wait == 0) { + vm_pageout_state.vm_pageout_deadlock_wait = VM_PAGEOUT_DEADLOCK_WAIT; + } + + if (vm_pageout_state.vm_pageout_deadlock_relief == 0) { + vm_pageout_state.vm_pageout_deadlock_relief = VM_PAGEOUT_DEADLOCK_RELIEF; + } + + if (vm_pageout_state.vm_pageout_burst_inactive_throttle == 0) { + vm_pageout_state.vm_pageout_burst_inactive_throttle = VM_PAGEOUT_BURST_INACTIVE_THROTTLE; + } + /* + * even if we've already called vm_page_free_reserve + * call it again here to insure that the targets are + * accurately calculated (it uses vm_page_free_count_init) + * calling it with an arg of 0 will not change the reserve + * but will re-calculate free_min and free_target + */ + if (vm_page_free_reserved < VM_PAGE_FREE_RESERVED(processor_count)) { + vm_page_free_reserve((VM_PAGE_FREE_RESERVED(processor_count)) - vm_page_free_reserved); + } else { + vm_page_free_reserve(0); + } + + + vm_page_queue_init(&vm_pageout_queue_external.pgo_pending); + vm_pageout_queue_external.pgo_maxlaundry = VM_PAGE_LAUNDRY_MAX; + vm_pageout_queue_external.pgo_laundry = 0; + vm_pageout_queue_external.pgo_idle = FALSE; + vm_pageout_queue_external.pgo_busy = FALSE; + vm_pageout_queue_external.pgo_throttled = FALSE; + vm_pageout_queue_external.pgo_draining = FALSE; + vm_pageout_queue_external.pgo_lowpriority = FALSE; + vm_pageout_queue_external.pgo_tid = -1; + vm_pageout_queue_external.pgo_inited = FALSE; + + vm_page_queue_init(&vm_pageout_queue_internal.pgo_pending); + vm_pageout_queue_internal.pgo_maxlaundry = 0; + vm_pageout_queue_internal.pgo_laundry = 0; + vm_pageout_queue_internal.pgo_idle = FALSE; + vm_pageout_queue_internal.pgo_busy = FALSE; + vm_pageout_queue_internal.pgo_throttled = FALSE; + vm_pageout_queue_internal.pgo_draining = FALSE; + vm_pageout_queue_internal.pgo_lowpriority = FALSE; + vm_pageout_queue_internal.pgo_tid = -1; + vm_pageout_queue_internal.pgo_inited = FALSE; + + /* internal pageout thread started when default pager registered first time */ + /* external pageout and garbage collection threads started here */ + + result = kernel_thread_start_priority((thread_continue_t)vm_pageout_iothread_external, NULL, + BASEPRI_VM, + &vm_pageout_state.vm_pageout_external_iothread); + if (result != KERN_SUCCESS) { + panic("vm_pageout_iothread_external: create failed"); + } + thread_set_thread_name(vm_pageout_state.vm_pageout_external_iothread, "VM_pageout_external_iothread"); + thread_deallocate(vm_pageout_state.vm_pageout_external_iothread); + + result = kernel_thread_start_priority((thread_continue_t)vm_pageout_garbage_collect, NULL, + BASEPRI_DEFAULT, + &thread); + if (result != KERN_SUCCESS) { + panic("vm_pageout_garbage_collect: create failed"); + } + thread_set_thread_name(thread, "VM_pageout_garbage_collect"); + thread_deallocate(thread); + +#if VM_PRESSURE_EVENTS + result = kernel_thread_start_priority((thread_continue_t)vm_pressure_thread, NULL, + BASEPRI_DEFAULT, + &thread); + + if (result != KERN_SUCCESS) { + panic("vm_pressure_thread: create failed"); + } + + thread_deallocate(thread); +#endif + + vm_object_reaper_init(); + + + bzero(&vm_config, sizeof(vm_config)); + + switch (vm_compressor_mode) { + case VM_PAGER_DEFAULT: + printf("mapping deprecated VM_PAGER_DEFAULT to VM_PAGER_COMPRESSOR_WITH_SWAP\n"); + OS_FALLTHROUGH; + + case VM_PAGER_COMPRESSOR_WITH_SWAP: + vm_config.compressor_is_present = TRUE; + vm_config.swap_is_present = TRUE; + vm_config.compressor_is_active = TRUE; + vm_config.swap_is_active = TRUE; + break; + + case VM_PAGER_COMPRESSOR_NO_SWAP: + vm_config.compressor_is_present = TRUE; + vm_config.swap_is_present = TRUE; + vm_config.compressor_is_active = TRUE; + break; + + case VM_PAGER_FREEZER_DEFAULT: + printf("mapping deprecated VM_PAGER_FREEZER_DEFAULT to VM_PAGER_FREEZER_COMPRESSOR_NO_SWAP\n"); + OS_FALLTHROUGH; + + case VM_PAGER_FREEZER_COMPRESSOR_NO_SWAP: + vm_config.compressor_is_present = TRUE; + vm_config.swap_is_present = TRUE; + break; + + case VM_PAGER_COMPRESSOR_NO_SWAP_PLUS_FREEZER_COMPRESSOR_WITH_SWAP: + vm_config.compressor_is_present = TRUE; + vm_config.swap_is_present = TRUE; + vm_config.compressor_is_active = TRUE; + vm_config.freezer_swap_is_active = TRUE; + break; + + case VM_PAGER_NOT_CONFIGURED: + break; + + default: + printf("unknown compressor mode - %x\n", vm_compressor_mode); + break; + } + if (VM_CONFIG_COMPRESSOR_IS_PRESENT) { + vm_compressor_pager_init(); + } + +#if VM_PRESSURE_EVENTS + vm_pressure_events_enabled = TRUE; +#endif /* VM_PRESSURE_EVENTS */ + +#if CONFIG_PHANTOM_CACHE + vm_phantom_cache_init(); +#endif +#if VM_PAGE_BUCKETS_CHECK +#if VM_PAGE_FAKE_BUCKETS + printf("**** DEBUG: protecting fake buckets [0x%llx:0x%llx]\n", + (uint64_t) vm_page_fake_buckets_start, + (uint64_t) vm_page_fake_buckets_end); + pmap_protect(kernel_pmap, + vm_page_fake_buckets_start, + vm_page_fake_buckets_end, + VM_PROT_READ); +// *(char *) vm_page_fake_buckets_start = 'x'; /* panic! */ +#endif /* VM_PAGE_FAKE_BUCKETS */ +#endif /* VM_PAGE_BUCKETS_CHECK */ + +#if VM_OBJECT_TRACKING + vm_object_tracking_init(); +#endif /* VM_OBJECT_TRACKING */ + + vm_pageout_continue(); + + /* + * Unreached code! + * + * The vm_pageout_continue() call above never returns, so the code below is never + * executed. We take advantage of this to declare several DTrace VM related probe + * points that our kernel doesn't have an analog for. These are probe points that + * exist in Solaris and are in the DTrace documentation, so people may have written + * scripts that use them. Declaring the probe points here means their scripts will + * compile and execute which we want for portability of the scripts, but since this + * section of code is never reached, the probe points will simply never fire. Yes, + * this is basically a hack. The problem is the DTrace probe points were chosen with + * Solaris specific VM events in mind, not portability to different VM implementations. + */ + + DTRACE_VM2(execfree, int, 1, (uint64_t *), NULL); + DTRACE_VM2(execpgin, int, 1, (uint64_t *), NULL); + DTRACE_VM2(execpgout, int, 1, (uint64_t *), NULL); + DTRACE_VM2(pgswapin, int, 1, (uint64_t *), NULL); + DTRACE_VM2(pgswapout, int, 1, (uint64_t *), NULL); + DTRACE_VM2(swapin, int, 1, (uint64_t *), NULL); + DTRACE_VM2(swapout, int, 1, (uint64_t *), NULL); + /*NOTREACHED*/ +} + + + +kern_return_t +vm_pageout_internal_start(void) +{ + kern_return_t result; + host_basic_info_data_t hinfo; + vm_offset_t buf, bufsize; + + assert(VM_CONFIG_COMPRESSOR_IS_PRESENT); + + mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT; +#define BSD_HOST 1 + host_info((host_t)BSD_HOST, HOST_BASIC_INFO, (host_info_t)&hinfo, &count); + + assert(hinfo.max_cpus > 0); + +#if CONFIG_EMBEDDED + vm_pageout_state.vm_compressor_thread_count = 1; +#else + if (hinfo.max_cpus > 4) { + vm_pageout_state.vm_compressor_thread_count = 2; + } else { + vm_pageout_state.vm_compressor_thread_count = 1; + } +#endif + PE_parse_boot_argn("vmcomp_threads", &vm_pageout_state.vm_compressor_thread_count, + sizeof(vm_pageout_state.vm_compressor_thread_count)); + +#if __AMP__ + PE_parse_boot_argn("vmcomp_ecluster", &vm_compressor_ebound, sizeof(vm_compressor_ebound)); + if (vm_compressor_ebound) { + vm_pageout_state.vm_compressor_thread_count = 2; + } +#endif + if (vm_pageout_state.vm_compressor_thread_count >= hinfo.max_cpus) { + vm_pageout_state.vm_compressor_thread_count = hinfo.max_cpus - 1; + } + if (vm_pageout_state.vm_compressor_thread_count <= 0) { + vm_pageout_state.vm_compressor_thread_count = 1; + } else if (vm_pageout_state.vm_compressor_thread_count > MAX_COMPRESSOR_THREAD_COUNT) { + vm_pageout_state.vm_compressor_thread_count = MAX_COMPRESSOR_THREAD_COUNT; + } + + vm_pageout_queue_internal.pgo_maxlaundry = + (vm_pageout_state.vm_compressor_thread_count * 4) * VM_PAGE_LAUNDRY_MAX; + + PE_parse_boot_argn("vmpgoi_maxlaundry", + &vm_pageout_queue_internal.pgo_maxlaundry, + sizeof(vm_pageout_queue_internal.pgo_maxlaundry)); + + bufsize = COMPRESSOR_SCRATCH_BUF_SIZE; + if (kernel_memory_allocate(kernel_map, &buf, + bufsize * vm_pageout_state.vm_compressor_thread_count, + 0, KMA_KOBJECT | KMA_PERMANENT, VM_KERN_MEMORY_COMPRESSOR)) { + panic("vm_pageout_internal_start: Unable to allocate %zd bytes", + (size_t)(bufsize * vm_pageout_state.vm_compressor_thread_count)); + } + + for (int i = 0; i < vm_pageout_state.vm_compressor_thread_count; i++) { + ciq[i].id = i; + ciq[i].q = &vm_pageout_queue_internal; + ciq[i].current_chead = NULL; + ciq[i].scratch_buf = (char *)(buf + i * bufsize); + + result = kernel_thread_start_priority((thread_continue_t)vm_pageout_iothread_internal, + (void *)&ciq[i], BASEPRI_VM, + &vm_pageout_state.vm_pageout_internal_iothread); + + if (result == KERN_SUCCESS) { + thread_deallocate(vm_pageout_state.vm_pageout_internal_iothread); + } else { + break; + } + } + return result; +} + +#if CONFIG_IOSCHED +/* + * To support I/O Expedite for compressed files we mark the upls with special flags. + * The way decmpfs works is that we create a big upl which marks all the pages needed to + * represent the compressed file as busy. We tag this upl with the flag UPL_DECMP_REQ. Decmpfs + * then issues smaller I/Os for compressed I/Os, deflates them and puts the data into the pages + * being held in the big original UPL. We mark each of these smaller UPLs with the flag + * UPL_DECMP_REAL_IO. Any outstanding real I/O UPL is tracked by the big req upl using the + * decmp_io_upl field (in the upl structure). This link is protected in the forward direction + * by the req upl lock (the reverse link doesnt need synch. since we never inspect this link + * unless the real I/O upl is being destroyed). + */ + + +static void +upl_set_decmp_info(upl_t upl, upl_t src_upl) +{ + assert((src_upl->flags & UPL_DECMP_REQ) != 0); + + upl_lock(src_upl); + if (src_upl->decmp_io_upl) { + /* + * If there is already an alive real I/O UPL, ignore this new UPL. + * This case should rarely happen and even if it does, it just means + * that we might issue a spurious expedite which the driver is expected + * to handle. + */ + upl_unlock(src_upl); + return; + } + src_upl->decmp_io_upl = (void *)upl; + src_upl->ref_count++; + + upl->flags |= UPL_DECMP_REAL_IO; + upl->decmp_io_upl = (void *)src_upl; + upl_unlock(src_upl); +} +#endif /* CONFIG_IOSCHED */ + +#if UPL_DEBUG +int upl_debug_enabled = 1; +#else +int upl_debug_enabled = 0; +#endif + +static upl_t +upl_create(int type, int flags, upl_size_t size) +{ + upl_t upl; + vm_size_t page_field_size = 0; + int upl_flags = 0; + vm_size_t upl_size = sizeof(struct upl); + + assert(page_aligned(size)); + + size = round_page_32(size); + + if (type & UPL_CREATE_LITE) { + page_field_size = (atop(size) + 7) >> 3; + page_field_size = (page_field_size + 3) & 0xFFFFFFFC; + + upl_flags |= UPL_LITE; + } + if (type & UPL_CREATE_INTERNAL) { + upl_size += sizeof(struct upl_page_info) * atop(size); + + upl_flags |= UPL_INTERNAL; + } + upl = (upl_t)kalloc(upl_size + page_field_size); + + if (page_field_size) { + bzero((char *)upl + upl_size, page_field_size); + } + + upl->flags = upl_flags | flags; + upl->kaddr = (vm_offset_t)0; + upl->u_offset = 0; + upl->u_size = 0; + upl->map_object = NULL; + upl->ref_count = 1; + upl->ext_ref_count = 0; + upl->highest_page = 0; + upl_lock_init(upl); + upl->vector_upl = NULL; + upl->associated_upl = NULL; + upl->upl_iodone = NULL; +#if CONFIG_IOSCHED + if (type & UPL_CREATE_IO_TRACKING) { + upl->upl_priority = proc_get_effective_thread_policy(current_thread(), TASK_POLICY_IO); + } + + upl->upl_reprio_info = 0; + upl->decmp_io_upl = 0; + if ((type & UPL_CREATE_INTERNAL) && (type & UPL_CREATE_EXPEDITE_SUP)) { + /* Only support expedite on internal UPLs */ + thread_t curthread = current_thread(); + upl->upl_reprio_info = (uint64_t *)kalloc(sizeof(uint64_t) * atop(size)); + bzero(upl->upl_reprio_info, (sizeof(uint64_t) * atop(size))); + upl->flags |= UPL_EXPEDITE_SUPPORTED; + if (curthread->decmp_upl != NULL) { + upl_set_decmp_info(upl, curthread->decmp_upl); + } + } +#endif +#if CONFIG_IOSCHED || UPL_DEBUG + if ((type & UPL_CREATE_IO_TRACKING) || upl_debug_enabled) { + upl->upl_creator = current_thread(); + upl->uplq.next = 0; + upl->uplq.prev = 0; + upl->flags |= UPL_TRACKED_BY_OBJECT; + } +#endif + +#if UPL_DEBUG + upl->ubc_alias1 = 0; + upl->ubc_alias2 = 0; + + upl->upl_state = 0; + upl->upl_commit_index = 0; + bzero(&upl->upl_commit_records[0], sizeof(upl->upl_commit_records)); + + (void) OSBacktrace(&upl->upl_create_retaddr[0], UPL_DEBUG_STACK_FRAMES); +#endif /* UPL_DEBUG */ + + return upl; +} + +static void +upl_destroy(upl_t upl) +{ + int page_field_size; /* bit field in word size buf */ + int size; + +// DEBUG4K_UPL("upl %p (u_offset 0x%llx u_size 0x%llx) object %p\n", upl, (uint64_t)upl->u_offset, (uint64_t)upl->u_size, upl->map_object); + + if (upl->ext_ref_count) { + panic("upl(%p) ext_ref_count", upl); + } + +#if CONFIG_IOSCHED + if ((upl->flags & UPL_DECMP_REAL_IO) && upl->decmp_io_upl) { + upl_t src_upl; + src_upl = upl->decmp_io_upl; + assert((src_upl->flags & UPL_DECMP_REQ) != 0); + upl_lock(src_upl); + src_upl->decmp_io_upl = NULL; + upl_unlock(src_upl); + upl_deallocate(src_upl); + } +#endif /* CONFIG_IOSCHED */ + +#if CONFIG_IOSCHED || UPL_DEBUG + if (((upl->flags & UPL_TRACKED_BY_OBJECT) || upl_debug_enabled) && + !(upl->flags & UPL_VECTOR)) { + vm_object_t object; + + if (upl->flags & UPL_SHADOWED) { + object = upl->map_object->shadow; + } else { + object = upl->map_object; + } + + vm_object_lock(object); + queue_remove(&object->uplq, upl, upl_t, uplq); + vm_object_activity_end(object); + vm_object_collapse(object, 0, TRUE); + vm_object_unlock(object); + } +#endif + /* + * drop a reference on the map_object whether or + * not a pageout object is inserted + */ + if (upl->flags & UPL_SHADOWED) { + vm_object_deallocate(upl->map_object); + } + + if (upl->flags & UPL_DEVICE_MEMORY) { + size = PAGE_SIZE; + } else { + size = upl_adjusted_size(upl, PAGE_MASK); + } + page_field_size = 0; + + if (upl->flags & UPL_LITE) { + page_field_size = ((size / PAGE_SIZE) + 7) >> 3; + page_field_size = (page_field_size + 3) & 0xFFFFFFFC; + } + upl_lock_destroy(upl); + upl->vector_upl = (vector_upl_t) 0xfeedbeef; + +#if CONFIG_IOSCHED + if (upl->flags & UPL_EXPEDITE_SUPPORTED) { + kfree(upl->upl_reprio_info, sizeof(uint64_t) * (size / PAGE_SIZE)); + } +#endif + + if (upl->flags & UPL_INTERNAL) { + kfree(upl, + sizeof(struct upl) + + (sizeof(struct upl_page_info) * (size / PAGE_SIZE)) + + page_field_size); + } else { + kfree(upl, sizeof(struct upl) + page_field_size); + } +} + +void +upl_deallocate(upl_t upl) +{ + upl_lock(upl); + + if (--upl->ref_count == 0) { + if (vector_upl_is_valid(upl)) { + vector_upl_deallocate(upl); + } + upl_unlock(upl); + + if (upl->upl_iodone) { + upl_callout_iodone(upl); + } + + upl_destroy(upl); + } else { + upl_unlock(upl); + } +} + +#if CONFIG_IOSCHED +void +upl_mark_decmp(upl_t upl) +{ + if (upl->flags & UPL_TRACKED_BY_OBJECT) { + upl->flags |= UPL_DECMP_REQ; + upl->upl_creator->decmp_upl = (void *)upl; + } +} + +void +upl_unmark_decmp(upl_t upl) +{ + if (upl && (upl->flags & UPL_DECMP_REQ)) { + upl->upl_creator->decmp_upl = NULL; + } +} + +#endif /* CONFIG_IOSCHED */ + +#define VM_PAGE_Q_BACKING_UP(q) \ + ((q)->pgo_laundry >= (((q)->pgo_maxlaundry * 8) / 10)) + +boolean_t must_throttle_writes(void); + +boolean_t +must_throttle_writes() +{ + if (VM_PAGE_Q_BACKING_UP(&vm_pageout_queue_external) && + vm_page_pageable_external_count > (AVAILABLE_NON_COMPRESSED_MEMORY * 6) / 10) { + return TRUE; + } + + return FALSE; +} + +#define MIN_DELAYED_WORK_CTX_ALLOCATED (16) +#define MAX_DELAYED_WORK_CTX_ALLOCATED (512) + +int vm_page_delayed_work_ctx_needed = 0; +zone_t dw_ctx_zone = ZONE_NULL; + +void +vm_page_delayed_work_init_ctx(void) +{ + int nelems = 0, elem_size = 0; + + elem_size = sizeof(struct vm_page_delayed_work_ctx); + + dw_ctx_zone = zone_create_ext("delayed-work-ctx", elem_size, + ZC_NOGC, ZONE_ID_ANY, ^(zone_t z) { + zone_set_exhaustible(z, MAX_DELAYED_WORK_CTX_ALLOCATED * elem_size); + }); + + nelems = zfill(dw_ctx_zone, MIN_DELAYED_WORK_CTX_ALLOCATED); + if (nelems < MIN_DELAYED_WORK_CTX_ALLOCATED) { + printf("vm_page_delayed_work_init_ctx: Failed to preallocate minimum delayed work contexts (%d vs %d).\n", nelems, MIN_DELAYED_WORK_CTX_ALLOCATED); +#if DEVELOPMENT || DEBUG + panic("Failed to preallocate minimum delayed work contexts (%d vs %d).\n", nelems, MIN_DELAYED_WORK_CTX_ALLOCATED); +#endif /* DEVELOPMENT || DEBUG */ + } +} + +struct vm_page_delayed_work* +vm_page_delayed_work_get_ctx(void) +{ + struct vm_page_delayed_work_ctx * dw_ctx = NULL; + + dw_ctx = (struct vm_page_delayed_work_ctx*) zalloc_noblock(dw_ctx_zone); + + if (dw_ctx) { + dw_ctx->delayed_owner = current_thread(); + } else { + vm_page_delayed_work_ctx_needed++; + } + return dw_ctx ? dw_ctx->dwp : NULL; +} + +void +vm_page_delayed_work_finish_ctx(struct vm_page_delayed_work* dwp) +{ + struct vm_page_delayed_work_ctx *ldw_ctx; + + ldw_ctx = (struct vm_page_delayed_work_ctx *)dwp; + ldw_ctx->delayed_owner = NULL; + + zfree(dw_ctx_zone, ldw_ctx); +} + +/* + * Routine: vm_object_upl_request + * Purpose: + * Cause the population of a portion of a vm_object. + * Depending on the nature of the request, the pages + * returned may be contain valid data or be uninitialized. + * A page list structure, listing the physical pages + * will be returned upon request. + * This function is called by the file system or any other + * supplier of backing store to a pager. + * IMPORTANT NOTE: The caller must still respect the relationship + * between the vm_object and its backing memory object. The + * caller MUST NOT substitute changes in the backing file + * without first doing a memory_object_lock_request on the + * target range unless it is know that the pages are not + * shared with another entity at the pager level. + * Copy_in_to: + * if a page list structure is present + * return the mapped physical pages, where a + * page is not present, return a non-initialized + * one. If the no_sync bit is turned on, don't + * call the pager unlock to synchronize with other + * possible copies of the page. Leave pages busy + * in the original object, if a page list structure + * was specified. When a commit of the page list + * pages is done, the dirty bit will be set for each one. + * Copy_out_from: + * If a page list structure is present, return + * all mapped pages. Where a page does not exist + * map a zero filled one. Leave pages busy in + * the original object. If a page list structure + * is not specified, this call is a no-op. + * + * Note: access of default pager objects has a rather interesting + * twist. The caller of this routine, presumably the file system + * page cache handling code, will never actually make a request + * against a default pager backed object. Only the default + * pager will make requests on backing store related vm_objects + * In this way the default pager can maintain the relationship + * between backing store files (abstract memory objects) and + * the vm_objects (cache objects), they support. + * + */ + +__private_extern__ kern_return_t +vm_object_upl_request( + vm_object_t object, + vm_object_offset_t offset, + upl_size_t size, + upl_t *upl_ptr, + upl_page_info_array_t user_page_list, + unsigned int *page_list_count, + upl_control_flags_t cntrl_flags, + vm_tag_t tag) +{ + vm_page_t dst_page = VM_PAGE_NULL; + vm_object_offset_t dst_offset; + upl_size_t xfer_size; + unsigned int size_in_pages; + boolean_t dirty; + boolean_t hw_dirty; + upl_t upl = NULL; + unsigned int entry; + vm_page_t alias_page = NULL; + int refmod_state = 0; + wpl_array_t lite_list = NULL; + vm_object_t last_copy_object; + struct vm_page_delayed_work dw_array; + struct vm_page_delayed_work *dwp, *dwp_start; + bool dwp_finish_ctx = TRUE; + int dw_count; + int dw_limit; + int io_tracking_flag = 0; + int grab_options; + int page_grab_count = 0; + ppnum_t phys_page; + pmap_flush_context pmap_flush_context_storage; + boolean_t pmap_flushes_delayed = FALSE; +#if DEVELOPMENT || DEBUG + task_t task = current_task(); +#endif /* DEVELOPMENT || DEBUG */ + + dwp_start = dwp = NULL; + + if (cntrl_flags & ~UPL_VALID_FLAGS) { + /* + * For forward compatibility's sake, + * reject any unknown flag. + */ + return KERN_INVALID_VALUE; + } + if ((!object->internal) && (object->paging_offset != 0)) { + panic("vm_object_upl_request: external object with non-zero paging offset\n"); + } + if (object->phys_contiguous) { + panic("vm_object_upl_request: contiguous object specified\n"); + } + + assertf(page_aligned(offset) && page_aligned(size), + "offset 0x%llx size 0x%x", + offset, size); + + VM_DEBUG_CONSTANT_EVENT(vm_object_upl_request, VM_UPL_REQUEST, DBG_FUNC_START, size, cntrl_flags, 0, 0); + + dw_count = 0; + dw_limit = DELAYED_WORK_LIMIT(DEFAULT_DELAYED_WORK_LIMIT); + dwp_start = vm_page_delayed_work_get_ctx(); + if (dwp_start == NULL) { + dwp_start = &dw_array; + dw_limit = 1; + dwp_finish_ctx = FALSE; + } + + dwp = dwp_start; + + if (size > MAX_UPL_SIZE_BYTES) { + size = MAX_UPL_SIZE_BYTES; + } + + if ((cntrl_flags & UPL_SET_INTERNAL) && page_list_count != NULL) { + *page_list_count = MAX_UPL_SIZE_BYTES >> PAGE_SHIFT; + } + +#if CONFIG_IOSCHED || UPL_DEBUG + if (object->io_tracking || upl_debug_enabled) { + io_tracking_flag |= UPL_CREATE_IO_TRACKING; + } +#endif +#if CONFIG_IOSCHED + if (object->io_tracking) { + io_tracking_flag |= UPL_CREATE_EXPEDITE_SUP; + } +#endif + + if (cntrl_flags & UPL_SET_INTERNAL) { + if (cntrl_flags & UPL_SET_LITE) { + upl = upl_create(UPL_CREATE_INTERNAL | UPL_CREATE_LITE | io_tracking_flag, 0, size); + + user_page_list = (upl_page_info_t *) (((uintptr_t)upl) + sizeof(struct upl)); + lite_list = (wpl_array_t) + (((uintptr_t)user_page_list) + + ((size / PAGE_SIZE) * sizeof(upl_page_info_t))); + if (size == 0) { + user_page_list = NULL; + lite_list = NULL; + } + } else { + upl = upl_create(UPL_CREATE_INTERNAL | io_tracking_flag, 0, size); + + user_page_list = (upl_page_info_t *) (((uintptr_t)upl) + sizeof(struct upl)); + if (size == 0) { + user_page_list = NULL; + } + } + } else { + if (cntrl_flags & UPL_SET_LITE) { + upl = upl_create(UPL_CREATE_EXTERNAL | UPL_CREATE_LITE | io_tracking_flag, 0, size); + + lite_list = (wpl_array_t) (((uintptr_t)upl) + sizeof(struct upl)); + if (size == 0) { + lite_list = NULL; + } + } else { + upl = upl_create(UPL_CREATE_EXTERNAL | io_tracking_flag, 0, size); + } + } + *upl_ptr = upl; + + if (user_page_list) { + user_page_list[0].device = FALSE; + } + + if (cntrl_flags & UPL_SET_LITE) { + upl->map_object = object; + } else { + upl->map_object = vm_object_allocate(size); + /* + * No neeed to lock the new object: nobody else knows + * about it yet, so it's all ours so far. + */ + upl->map_object->shadow = object; + upl->map_object->pageout = TRUE; + upl->map_object->can_persist = FALSE; + upl->map_object->copy_strategy = MEMORY_OBJECT_COPY_NONE; + upl->map_object->vo_shadow_offset = offset; + upl->map_object->wimg_bits = object->wimg_bits; + assertf(page_aligned(upl->map_object->vo_shadow_offset), + "object %p shadow_offset 0x%llx", + upl->map_object, upl->map_object->vo_shadow_offset); + + VM_PAGE_GRAB_FICTITIOUS(alias_page); + + upl->flags |= UPL_SHADOWED; + } + if (cntrl_flags & UPL_FOR_PAGEOUT) { + upl->flags |= UPL_PAGEOUT; + } + + vm_object_lock(object); + vm_object_activity_begin(object); + + grab_options = 0; +#if CONFIG_SECLUDED_MEMORY + if (object->can_grab_secluded) { + grab_options |= VM_PAGE_GRAB_SECLUDED; + } +#endif /* CONFIG_SECLUDED_MEMORY */ + + /* + * we can lock in the paging_offset once paging_in_progress is set + */ + upl->u_size = size; + upl->u_offset = offset + object->paging_offset; + +#if CONFIG_IOSCHED || UPL_DEBUG + if (object->io_tracking || upl_debug_enabled) { + vm_object_activity_begin(object); + queue_enter(&object->uplq, upl, upl_t, uplq); + } +#endif + if ((cntrl_flags & UPL_WILL_MODIFY) && object->copy != VM_OBJECT_NULL) { + /* + * Honor copy-on-write obligations + * + * The caller is gathering these pages and + * might modify their contents. We need to + * make sure that the copy object has its own + * private copies of these pages before we let + * the caller modify them. + */ + vm_object_update(object, + offset, + size, + NULL, + NULL, + FALSE, /* should_return */ + MEMORY_OBJECT_COPY_SYNC, + VM_PROT_NO_CHANGE); + + VM_PAGEOUT_DEBUG(upl_cow, 1); + VM_PAGEOUT_DEBUG(upl_cow_pages, (size >> PAGE_SHIFT)); + } + /* + * remember which copy object we synchronized with + */ + last_copy_object = object->copy; + entry = 0; + + xfer_size = size; + dst_offset = offset; + size_in_pages = size / PAGE_SIZE; + + if (vm_page_free_count > (vm_page_free_target + size_in_pages) || + object->resident_page_count < ((MAX_UPL_SIZE_BYTES * 2) >> PAGE_SHIFT)) { + object->scan_collisions = 0; + } + + if ((cntrl_flags & UPL_WILL_MODIFY) && must_throttle_writes() == TRUE) { + boolean_t isSSD = FALSE; + +#if CONFIG_EMBEDDED + isSSD = TRUE; +#else + vnode_pager_get_isSSD(object->pager, &isSSD); +#endif + vm_object_unlock(object); + + OSAddAtomic(size_in_pages, &vm_upl_wait_for_pages); + + if (isSSD == TRUE) { + delay(1000 * size_in_pages); + } else { + delay(5000 * size_in_pages); + } + OSAddAtomic(-size_in_pages, &vm_upl_wait_for_pages); + + vm_object_lock(object); + } + + while (xfer_size) { + dwp->dw_mask = 0; + + if ((alias_page == NULL) && !(cntrl_flags & UPL_SET_LITE)) { + vm_object_unlock(object); + VM_PAGE_GRAB_FICTITIOUS(alias_page); + vm_object_lock(object); + } + if (cntrl_flags & UPL_COPYOUT_FROM) { + upl->flags |= UPL_PAGE_SYNC_DONE; + + if (((dst_page = vm_page_lookup(object, dst_offset)) == VM_PAGE_NULL) || + dst_page->vmp_fictitious || + dst_page->vmp_absent || + dst_page->vmp_error || + dst_page->vmp_cleaning || + (VM_PAGE_WIRED(dst_page))) { + if (user_page_list) { + user_page_list[entry].phys_addr = 0; + } + + goto try_next_page; + } + phys_page = VM_PAGE_GET_PHYS_PAGE(dst_page); + + /* + * grab this up front... + * a high percentange of the time we're going to + * need the hardware modification state a bit later + * anyway... so we can eliminate an extra call into + * the pmap layer by grabbing it here and recording it + */ + if (dst_page->vmp_pmapped) { + refmod_state = pmap_get_refmod(phys_page); + } else { + refmod_state = 0; + } + + if ((refmod_state & VM_MEM_REFERENCED) && VM_PAGE_INACTIVE(dst_page)) { + /* + * page is on inactive list and referenced... + * reactivate it now... this gets it out of the + * way of vm_pageout_scan which would have to + * reactivate it upon tripping over it + */ + dwp->dw_mask |= DW_vm_page_activate; + } + if (cntrl_flags & UPL_RET_ONLY_DIRTY) { + /* + * we're only asking for DIRTY pages to be returned + */ + if (dst_page->vmp_laundry || !(cntrl_flags & UPL_FOR_PAGEOUT)) { + /* + * if we were the page stolen by vm_pageout_scan to be + * cleaned (as opposed to a buddy being clustered in + * or this request is not being driven by a PAGEOUT cluster + * then we only need to check for the page being dirty or + * precious to decide whether to return it + */ + if (dst_page->vmp_dirty || dst_page->vmp_precious || (refmod_state & VM_MEM_MODIFIED)) { + goto check_busy; + } + goto dont_return; + } + /* + * this is a request for a PAGEOUT cluster and this page + * is merely along for the ride as a 'buddy'... not only + * does it have to be dirty to be returned, but it also + * can't have been referenced recently... + */ + if ((hibernate_cleaning_in_progress == TRUE || + (!((refmod_state & VM_MEM_REFERENCED) || dst_page->vmp_reference) || + (dst_page->vmp_q_state == VM_PAGE_ON_THROTTLED_Q))) && + ((refmod_state & VM_MEM_MODIFIED) || dst_page->vmp_dirty || dst_page->vmp_precious)) { + goto check_busy; + } +dont_return: + /* + * if we reach here, we're not to return + * the page... go on to the next one + */ + if (dst_page->vmp_laundry == TRUE) { + /* + * if we get here, the page is not 'cleaning' (filtered out above). + * since it has been referenced, remove it from the laundry + * so we don't pay the cost of an I/O to clean a page + * we're just going to take back + */ + vm_page_lockspin_queues(); + + vm_pageout_steal_laundry(dst_page, TRUE); + vm_page_activate(dst_page); + + vm_page_unlock_queues(); + } + if (user_page_list) { + user_page_list[entry].phys_addr = 0; + } + + goto try_next_page; + } +check_busy: + if (dst_page->vmp_busy) { + if (cntrl_flags & UPL_NOBLOCK) { + if (user_page_list) { + user_page_list[entry].phys_addr = 0; + } + dwp->dw_mask = 0; + + goto try_next_page; + } + /* + * someone else is playing with the + * page. We will have to wait. + */ + PAGE_SLEEP(object, dst_page, THREAD_UNINT); + + continue; + } + if (dst_page->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q) { + vm_page_lockspin_queues(); + + if (dst_page->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q) { + /* + * we've buddied up a page for a clustered pageout + * that has already been moved to the pageout + * queue by pageout_scan... we need to remove + * it from the queue and drop the laundry count + * on that queue + */ + vm_pageout_throttle_up(dst_page); + } + vm_page_unlock_queues(); + } + hw_dirty = refmod_state & VM_MEM_MODIFIED; + dirty = hw_dirty ? TRUE : dst_page->vmp_dirty; + + if (phys_page > upl->highest_page) { + upl->highest_page = phys_page; + } + + assert(!pmap_is_noencrypt(phys_page)); + + if (cntrl_flags & UPL_SET_LITE) { + unsigned int pg_num; + + pg_num = (unsigned int) ((dst_offset - offset) / PAGE_SIZE); + assert(pg_num == (dst_offset - offset) / PAGE_SIZE); + lite_list[pg_num >> 5] |= 1U << (pg_num & 31); + + if (hw_dirty) { + if (pmap_flushes_delayed == FALSE) { + pmap_flush_context_init(&pmap_flush_context_storage); + pmap_flushes_delayed = TRUE; + } + pmap_clear_refmod_options(phys_page, + VM_MEM_MODIFIED, + PMAP_OPTIONS_NOFLUSH | PMAP_OPTIONS_CLEAR_WRITE, + &pmap_flush_context_storage); + } + + /* + * Mark original page as cleaning + * in place. + */ + dst_page->vmp_cleaning = TRUE; + dst_page->vmp_precious = FALSE; + } else { + /* + * use pageclean setup, it is more + * convenient even for the pageout + * cases here + */ + vm_object_lock(upl->map_object); + vm_pageclean_setup(dst_page, alias_page, upl->map_object, size - xfer_size); + vm_object_unlock(upl->map_object); + + alias_page->vmp_absent = FALSE; + alias_page = NULL; + } + if (dirty) { + SET_PAGE_DIRTY(dst_page, FALSE); + } else { + dst_page->vmp_dirty = FALSE; + } + + if (!dirty) { + dst_page->vmp_precious = TRUE; + } + + if (!(cntrl_flags & UPL_CLEAN_IN_PLACE)) { + if (!VM_PAGE_WIRED(dst_page)) { + dst_page->vmp_free_when_done = TRUE; + } + } + } else { + if ((cntrl_flags & UPL_WILL_MODIFY) && object->copy != last_copy_object) { + /* + * Honor copy-on-write obligations + * + * The copy object has changed since we + * last synchronized for copy-on-write. + * Another copy object might have been + * inserted while we released the object's + * lock. Since someone could have seen the + * original contents of the remaining pages + * through that new object, we have to + * synchronize with it again for the remaining + * pages only. The previous pages are "busy" + * so they can not be seen through the new + * mapping. The new mapping will see our + * upcoming changes for those previous pages, + * but that's OK since they couldn't see what + * was there before. It's just a race anyway + * and there's no guarantee of consistency or + * atomicity. We just don't want new mappings + * to see both the *before* and *after* pages. + */ + if (object->copy != VM_OBJECT_NULL) { + vm_object_update( + object, + dst_offset,/* current offset */ + xfer_size, /* remaining size */ + NULL, + NULL, + FALSE, /* should_return */ + MEMORY_OBJECT_COPY_SYNC, + VM_PROT_NO_CHANGE); + + VM_PAGEOUT_DEBUG(upl_cow_again, 1); + VM_PAGEOUT_DEBUG(upl_cow_again_pages, (xfer_size >> PAGE_SHIFT)); + } + /* + * remember the copy object we synced with + */ + last_copy_object = object->copy; + } + dst_page = vm_page_lookup(object, dst_offset); + + if (dst_page != VM_PAGE_NULL) { + if ((cntrl_flags & UPL_RET_ONLY_ABSENT)) { + /* + * skip over pages already present in the cache + */ + if (user_page_list) { + user_page_list[entry].phys_addr = 0; + } + + goto try_next_page; + } + if (dst_page->vmp_fictitious) { + panic("need corner case for fictitious page"); + } + + if (dst_page->vmp_busy || dst_page->vmp_cleaning) { + /* + * someone else is playing with the + * page. We will have to wait. + */ + PAGE_SLEEP(object, dst_page, THREAD_UNINT); + + continue; + } + if (dst_page->vmp_laundry) { + vm_pageout_steal_laundry(dst_page, FALSE); + } + } else { + if (object->private) { + /* + * This is a nasty wrinkle for users + * of upl who encounter device or + * private memory however, it is + * unavoidable, only a fault can + * resolve the actual backing + * physical page by asking the + * backing device. + */ + if (user_page_list) { + user_page_list[entry].phys_addr = 0; + } + + goto try_next_page; + } + if (object->scan_collisions) { + /* + * the pageout_scan thread is trying to steal + * pages from this object, but has run into our + * lock... grab 2 pages from the head of the object... + * the first is freed on behalf of pageout_scan, the + * 2nd is for our own use... we use vm_object_page_grab + * in both cases to avoid taking pages from the free + * list since we are under memory pressure and our + * lock on this object is getting in the way of + * relieving it + */ + dst_page = vm_object_page_grab(object); + + if (dst_page != VM_PAGE_NULL) { + vm_page_release(dst_page, + FALSE); + } + + dst_page = vm_object_page_grab(object); + } + if (dst_page == VM_PAGE_NULL) { + /* + * need to allocate a page + */ + dst_page = vm_page_grab_options(grab_options); + if (dst_page != VM_PAGE_NULL) { + page_grab_count++; + } + } + if (dst_page == VM_PAGE_NULL) { + if ((cntrl_flags & (UPL_RET_ONLY_ABSENT | UPL_NOBLOCK)) == (UPL_RET_ONLY_ABSENT | UPL_NOBLOCK)) { + /* + * we don't want to stall waiting for pages to come onto the free list + * while we're already holding absent pages in this UPL + * the caller will deal with the empty slots + */ + if (user_page_list) { + user_page_list[entry].phys_addr = 0; + } + + goto try_next_page; + } + /* + * no pages available... wait + * then try again for the same + * offset... + */ + vm_object_unlock(object); + + OSAddAtomic(size_in_pages, &vm_upl_wait_for_pages); + + VM_DEBUG_EVENT(vm_upl_page_wait, VM_UPL_PAGE_WAIT, DBG_FUNC_START, vm_upl_wait_for_pages, 0, 0, 0); + + VM_PAGE_WAIT(); + OSAddAtomic(-size_in_pages, &vm_upl_wait_for_pages); + + VM_DEBUG_EVENT(vm_upl_page_wait, VM_UPL_PAGE_WAIT, DBG_FUNC_END, vm_upl_wait_for_pages, 0, 0, 0); + + vm_object_lock(object); + + continue; + } + vm_page_insert(dst_page, object, dst_offset); + + dst_page->vmp_absent = TRUE; + dst_page->vmp_busy = FALSE; + + if (cntrl_flags & UPL_RET_ONLY_ABSENT) { + /* + * if UPL_RET_ONLY_ABSENT was specified, + * than we're definitely setting up a + * upl for a clustered read/pagein + * operation... mark the pages as clustered + * so upl_commit_range can put them on the + * speculative list + */ + dst_page->vmp_clustered = TRUE; + + if (!(cntrl_flags & UPL_FILE_IO)) { + VM_STAT_INCR(pageins); + } + } + } + phys_page = VM_PAGE_GET_PHYS_PAGE(dst_page); + + dst_page->vmp_overwriting = TRUE; + + if (dst_page->vmp_pmapped) { + if (!(cntrl_flags & UPL_FILE_IO)) { + /* + * eliminate all mappings from the + * original object and its prodigy + */ + refmod_state = pmap_disconnect(phys_page); + } else { + refmod_state = pmap_get_refmod(phys_page); + } + } else { + refmod_state = 0; + } + + hw_dirty = refmod_state & VM_MEM_MODIFIED; + dirty = hw_dirty ? TRUE : dst_page->vmp_dirty; + + if (cntrl_flags & UPL_SET_LITE) { + unsigned int pg_num; + + pg_num = (unsigned int) ((dst_offset - offset) / PAGE_SIZE); + assert(pg_num == (dst_offset - offset) / PAGE_SIZE); + lite_list[pg_num >> 5] |= 1U << (pg_num & 31); + + if (hw_dirty) { + pmap_clear_modify(phys_page); + } + + /* + * Mark original page as cleaning + * in place. + */ + dst_page->vmp_cleaning = TRUE; + dst_page->vmp_precious = FALSE; + } else { + /* + * use pageclean setup, it is more + * convenient even for the pageout + * cases here + */ + vm_object_lock(upl->map_object); + vm_pageclean_setup(dst_page, alias_page, upl->map_object, size - xfer_size); + vm_object_unlock(upl->map_object); + + alias_page->vmp_absent = FALSE; + alias_page = NULL; + } + + if (cntrl_flags & UPL_REQUEST_SET_DIRTY) { + upl->flags &= ~UPL_CLEAR_DIRTY; + upl->flags |= UPL_SET_DIRTY; + dirty = TRUE; + /* + * Page belonging to a code-signed object is about to + * be written. Mark it tainted and disconnect it from + * all pmaps so processes have to fault it back in and + * deal with the tainted bit. + */ + if (object->code_signed && dst_page->vmp_cs_tainted != VMP_CS_ALL_TRUE) { + dst_page->vmp_cs_tainted = VMP_CS_ALL_TRUE; + vm_page_upl_tainted++; + if (dst_page->vmp_pmapped) { + refmod_state = pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(dst_page)); + if (refmod_state & VM_MEM_REFERENCED) { + dst_page->vmp_reference = TRUE; + } + } + } + } else if (cntrl_flags & UPL_CLEAN_IN_PLACE) { + /* + * clean in place for read implies + * that a write will be done on all + * the pages that are dirty before + * a upl commit is done. The caller + * is obligated to preserve the + * contents of all pages marked dirty + */ + upl->flags |= UPL_CLEAR_DIRTY; + } + dst_page->vmp_dirty = dirty; + + if (!dirty) { + dst_page->vmp_precious = TRUE; + } + + if (!VM_PAGE_WIRED(dst_page)) { + /* + * deny access to the target page while + * it is being worked on + */ + dst_page->vmp_busy = TRUE; + } else { + dwp->dw_mask |= DW_vm_page_wire; + } + + /* + * We might be about to satisfy a fault which has been + * requested. So no need for the "restart" bit. + */ + dst_page->vmp_restart = FALSE; + if (!dst_page->vmp_absent && !(cntrl_flags & UPL_WILL_MODIFY)) { + /* + * expect the page to be used + */ + dwp->dw_mask |= DW_set_reference; + } + if (cntrl_flags & UPL_PRECIOUS) { + if (object->internal) { + SET_PAGE_DIRTY(dst_page, FALSE); + dst_page->vmp_precious = FALSE; + } else { + dst_page->vmp_precious = TRUE; + } + } else { + dst_page->vmp_precious = FALSE; + } + } + if (dst_page->vmp_busy) { + upl->flags |= UPL_HAS_BUSY; + } + + if (phys_page > upl->highest_page) { + upl->highest_page = phys_page; + } + assert(!pmap_is_noencrypt(phys_page)); + if (user_page_list) { + user_page_list[entry].phys_addr = phys_page; + user_page_list[entry].free_when_done = dst_page->vmp_free_when_done; + user_page_list[entry].absent = dst_page->vmp_absent; + user_page_list[entry].dirty = dst_page->vmp_dirty; + user_page_list[entry].precious = dst_page->vmp_precious; + user_page_list[entry].device = FALSE; + user_page_list[entry].needed = FALSE; + if (dst_page->vmp_clustered == TRUE) { + user_page_list[entry].speculative = (dst_page->vmp_q_state == VM_PAGE_ON_SPECULATIVE_Q) ? TRUE : FALSE; + } else { + user_page_list[entry].speculative = FALSE; + } + user_page_list[entry].cs_validated = dst_page->vmp_cs_validated; + user_page_list[entry].cs_tainted = dst_page->vmp_cs_tainted; + user_page_list[entry].cs_nx = dst_page->vmp_cs_nx; + user_page_list[entry].mark = FALSE; + } + /* + * if UPL_RET_ONLY_ABSENT is set, then + * we are working with a fresh page and we've + * just set the clustered flag on it to + * indicate that it was drug in as part of a + * speculative cluster... so leave it alone + */ + if (!(cntrl_flags & UPL_RET_ONLY_ABSENT)) { + /* + * someone is explicitly grabbing this page... + * update clustered and speculative state + * + */ + if (dst_page->vmp_clustered) { + VM_PAGE_CONSUME_CLUSTERED(dst_page); + } + } +try_next_page: + if (dwp->dw_mask) { + if (dwp->dw_mask & DW_vm_page_activate) { + VM_STAT_INCR(reactivations); + } + + VM_PAGE_ADD_DELAYED_WORK(dwp, dst_page, dw_count); + + if (dw_count >= dw_limit) { + vm_page_do_delayed_work(object, tag, dwp_start, dw_count); + + dwp = dwp_start; + dw_count = 0; + } + } + entry++; + dst_offset += PAGE_SIZE_64; + xfer_size -= PAGE_SIZE; + } + if (dw_count) { + vm_page_do_delayed_work(object, tag, dwp_start, dw_count); + dwp = dwp_start; + dw_count = 0; + } + + if (alias_page != NULL) { + VM_PAGE_FREE(alias_page); + } + if (pmap_flushes_delayed == TRUE) { + pmap_flush(&pmap_flush_context_storage); + } + + if (page_list_count != NULL) { + if (upl->flags & UPL_INTERNAL) { + *page_list_count = 0; + } else if (*page_list_count > entry) { + *page_list_count = entry; + } + } +#if UPL_DEBUG + upl->upl_state = 1; +#endif + vm_object_unlock(object); + + VM_DEBUG_CONSTANT_EVENT(vm_object_upl_request, VM_UPL_REQUEST, DBG_FUNC_END, page_grab_count, 0, 0, 0); +#if DEVELOPMENT || DEBUG + if (task != NULL) { + ledger_credit(task->ledger, task_ledgers.pages_grabbed_upl, page_grab_count); + } +#endif /* DEVELOPMENT || DEBUG */ + + if (dwp_start && dwp_finish_ctx) { + vm_page_delayed_work_finish_ctx(dwp_start); + dwp_start = dwp = NULL; + } + + return KERN_SUCCESS; +} + +/* + * Routine: vm_object_super_upl_request + * Purpose: + * Cause the population of a portion of a vm_object + * in much the same way as memory_object_upl_request. + * Depending on the nature of the request, the pages + * returned may be contain valid data or be uninitialized. + * However, the region may be expanded up to the super + * cluster size provided. + */ + +__private_extern__ kern_return_t +vm_object_super_upl_request( + vm_object_t object, + vm_object_offset_t offset, + upl_size_t size, + upl_size_t super_cluster, + upl_t *upl, + upl_page_info_t *user_page_list, + unsigned int *page_list_count, + upl_control_flags_t cntrl_flags, + vm_tag_t tag) +{ + if (object->paging_offset > offset || ((cntrl_flags & UPL_VECTOR) == UPL_VECTOR)) { + return KERN_FAILURE; + } + + assert(object->paging_in_progress); + offset = offset - object->paging_offset; + + if (super_cluster > size) { + vm_object_offset_t base_offset; + upl_size_t super_size; + vm_object_size_t super_size_64; + + base_offset = (offset & ~((vm_object_offset_t) super_cluster - 1)); + super_size = (offset + size) > (base_offset + super_cluster) ? super_cluster << 1 : super_cluster; + super_size_64 = ((base_offset + super_size) > object->vo_size) ? (object->vo_size - base_offset) : super_size; + super_size = (upl_size_t) super_size_64; + assert(super_size == super_size_64); + + if (offset > (base_offset + super_size)) { + panic("vm_object_super_upl_request: Missed target pageout" + " %#llx,%#llx, %#x, %#x, %#x, %#llx\n", + offset, base_offset, super_size, super_cluster, + size, object->paging_offset); + } + /* + * apparently there is a case where the vm requests a + * page to be written out who's offset is beyond the + * object size + */ + if ((offset + size) > (base_offset + super_size)) { + super_size_64 = (offset + size) - base_offset; + super_size = (upl_size_t) super_size_64; + assert(super_size == super_size_64); + } + + offset = base_offset; + size = super_size; + } + return vm_object_upl_request(object, offset, size, upl, user_page_list, page_list_count, cntrl_flags, tag); +} + +int cs_executable_create_upl = 0; +extern int proc_selfpid(void); +extern char *proc_name_address(void *p); + +kern_return_t +vm_map_create_upl( + vm_map_t map, + vm_map_address_t offset, + upl_size_t *upl_size, + upl_t *upl, + upl_page_info_array_t page_list, + unsigned int *count, + upl_control_flags_t *flags, + vm_tag_t tag) +{ + vm_map_entry_t entry; + upl_control_flags_t caller_flags; + int force_data_sync; + int sync_cow_data; + vm_object_t local_object; + vm_map_offset_t local_offset; + vm_map_offset_t local_start; + kern_return_t ret; + vm_map_address_t original_offset; + vm_map_size_t original_size, adjusted_size; + vm_map_offset_t local_entry_start; + vm_object_offset_t local_entry_offset; + vm_object_offset_t offset_in_mapped_page; + boolean_t release_map = FALSE; + +start_with_map: + + original_offset = offset; + original_size = *upl_size; + adjusted_size = original_size; + + caller_flags = *flags; + + if (caller_flags & ~UPL_VALID_FLAGS) { + /* + * For forward compatibility's sake, + * reject any unknown flag. + */ + ret = KERN_INVALID_VALUE; + goto done; + } + force_data_sync = (caller_flags & UPL_FORCE_DATA_SYNC); + sync_cow_data = !(caller_flags & UPL_COPYOUT_FROM); + + if (upl == NULL) { + ret = KERN_INVALID_ARGUMENT; + goto done; + } + +REDISCOVER_ENTRY: + vm_map_lock_read(map); + + if (!vm_map_lookup_entry(map, offset, &entry)) { + vm_map_unlock_read(map); + ret = KERN_FAILURE; + goto done; + } + + local_entry_start = entry->vme_start; + local_entry_offset = VME_OFFSET(entry); + + if (VM_MAP_PAGE_SHIFT(map) < PAGE_SHIFT) { + DEBUG4K_UPL("map %p (%d) offset 0x%llx size 0x%x flags 0x%llx\n", map, VM_MAP_PAGE_SHIFT(map), (uint64_t)offset, *upl_size, *flags); + } + + if (entry->vme_end - original_offset < adjusted_size) { + adjusted_size = entry->vme_end - original_offset; + assert(adjusted_size > 0); + *upl_size = (upl_size_t) adjusted_size; + assert(*upl_size == adjusted_size); + } + + if (caller_flags & UPL_QUERY_OBJECT_TYPE) { + *flags = 0; + + if (!entry->is_sub_map && + VME_OBJECT(entry) != VM_OBJECT_NULL) { + if (VME_OBJECT(entry)->private) { + *flags = UPL_DEV_MEMORY; + } + + if (VME_OBJECT(entry)->phys_contiguous) { + *flags |= UPL_PHYS_CONTIG; + } + } + vm_map_unlock_read(map); + ret = KERN_SUCCESS; + goto done; + } + + offset_in_mapped_page = 0; + if (VM_MAP_PAGE_SIZE(map) < PAGE_SIZE) { + offset = vm_map_trunc_page(original_offset, VM_MAP_PAGE_MASK(map)); + *upl_size = (upl_size_t) + (vm_map_round_page(original_offset + adjusted_size, + VM_MAP_PAGE_MASK(map)) + - offset); + + offset_in_mapped_page = original_offset - offset; + assert(offset_in_mapped_page < VM_MAP_PAGE_SIZE(map)); + + DEBUG4K_UPL("map %p (%d) offset 0x%llx size 0x%llx flags 0x%llx -> offset 0x%llx adjusted_size 0x%llx *upl_size 0x%x offset_in_mapped_page 0x%llx\n", map, VM_MAP_PAGE_SHIFT(map), (uint64_t)original_offset, (uint64_t)original_size, *flags, (uint64_t)offset, (uint64_t)adjusted_size, *upl_size, offset_in_mapped_page); + } + + if (VME_OBJECT(entry) == VM_OBJECT_NULL || + !VME_OBJECT(entry)->phys_contiguous) { + if (*upl_size > MAX_UPL_SIZE_BYTES) { + *upl_size = MAX_UPL_SIZE_BYTES; + } + } + + /* + * Create an object if necessary. + */ + if (VME_OBJECT(entry) == VM_OBJECT_NULL) { + if (vm_map_lock_read_to_write(map)) { + goto REDISCOVER_ENTRY; + } + + VME_OBJECT_SET(entry, + vm_object_allocate((vm_size_t) + vm_object_round_page((entry->vme_end - entry->vme_start)))); + VME_OFFSET_SET(entry, 0); + assert(entry->use_pmap); + + vm_map_lock_write_to_read(map); + } + + if (!(caller_flags & UPL_COPYOUT_FROM) && + !entry->is_sub_map && + !(entry->protection & VM_PROT_WRITE)) { + vm_map_unlock_read(map); + ret = KERN_PROTECTION_FAILURE; + goto done; + } + +#if CONFIG_EMBEDDED + if (map->pmap != kernel_pmap && + (caller_flags & UPL_COPYOUT_FROM) && + (entry->protection & VM_PROT_EXECUTE) && + !(entry->protection & VM_PROT_WRITE)) { + vm_offset_t kaddr; + vm_size_t ksize; + + /* + * We're about to create a read-only UPL backed by + * memory from an executable mapping. + * Wiring the pages would result in the pages being copied + * (due to the "MAP_PRIVATE" mapping) and no longer + * code-signed, so no longer eligible for execution. + * Instead, let's copy the data into a kernel buffer and + * create the UPL from this kernel buffer. + * The kernel buffer is then freed, leaving the UPL holding + * the last reference on the VM object, so the memory will + * be released when the UPL is committed. + */ + + vm_map_unlock_read(map); + entry = VM_MAP_ENTRY_NULL; + /* allocate kernel buffer */ + ksize = round_page(*upl_size); + kaddr = 0; + ret = kmem_alloc_pageable(kernel_map, + &kaddr, + ksize, + tag); + if (ret == KERN_SUCCESS) { + /* copyin the user data */ + ret = copyinmap(map, offset, (void *)kaddr, *upl_size); + } + if (ret == KERN_SUCCESS) { + if (ksize > *upl_size) { + /* zero out the extra space in kernel buffer */ + memset((void *)(kaddr + *upl_size), + 0, + ksize - *upl_size); + } + /* create the UPL from the kernel buffer */ + vm_object_offset_t offset_in_object; + vm_object_offset_t offset_in_object_page; + + offset_in_object = offset - local_entry_start + local_entry_offset; + offset_in_object_page = offset_in_object - vm_object_trunc_page(offset_in_object); + assert(offset_in_object_page < PAGE_SIZE); + assert(offset_in_object_page + offset_in_mapped_page < PAGE_SIZE); + *upl_size -= offset_in_object_page + offset_in_mapped_page; + ret = vm_map_create_upl(kernel_map, + (vm_map_address_t)(kaddr + offset_in_object_page + offset_in_mapped_page), + upl_size, upl, page_list, count, flags, tag); + } + if (kaddr != 0) { + /* free the kernel buffer */ + kmem_free(kernel_map, kaddr, ksize); + kaddr = 0; + ksize = 0; + } +#if DEVELOPMENT || DEBUG + DTRACE_VM4(create_upl_from_executable, + vm_map_t, map, + vm_map_address_t, offset, + upl_size_t, *upl_size, + kern_return_t, ret); +#endif /* DEVELOPMENT || DEBUG */ + goto done; + } +#endif /* CONFIG_EMBEDDED */ + + local_object = VME_OBJECT(entry); + assert(local_object != VM_OBJECT_NULL); + + if (!entry->is_sub_map && + !entry->needs_copy && + *upl_size != 0 && + local_object->vo_size > *upl_size && /* partial UPL */ + entry->wired_count == 0 && /* No COW for entries that are wired */ + (map->pmap != kernel_pmap) && /* alias checks */ + (vm_map_entry_should_cow_for_true_share(entry) /* case 1 */ + || + ( /* case 2 */ + local_object->internal && + (local_object->copy_strategy == MEMORY_OBJECT_COPY_SYMMETRIC) && + local_object->ref_count > 1))) { + vm_prot_t prot; + + /* + * Case 1: + * Set up the targeted range for copy-on-write to avoid + * applying true_share/copy_delay to the entire object. + * + * Case 2: + * This map entry covers only part of an internal + * object. There could be other map entries covering + * other areas of this object and some of these map + * entries could be marked as "needs_copy", which + * assumes that the object is COPY_SYMMETRIC. + * To avoid marking this object as COPY_DELAY and + * "true_share", let's shadow it and mark the new + * (smaller) object as "true_share" and COPY_DELAY. + */ + + if (vm_map_lock_read_to_write(map)) { + goto REDISCOVER_ENTRY; + } + vm_map_lock_assert_exclusive(map); + assert(VME_OBJECT(entry) == local_object); + + vm_map_clip_start(map, + entry, + vm_map_trunc_page(offset, + VM_MAP_PAGE_MASK(map))); + vm_map_clip_end(map, + entry, + vm_map_round_page(offset + *upl_size, + VM_MAP_PAGE_MASK(map))); + if ((entry->vme_end - offset) < *upl_size) { + *upl_size = (upl_size_t) (entry->vme_end - offset); + assert(*upl_size == entry->vme_end - offset); + } + + prot = entry->protection & ~VM_PROT_WRITE; + if (override_nx(map, VME_ALIAS(entry)) && prot) { + prot |= VM_PROT_EXECUTE; + } + vm_object_pmap_protect(local_object, + VME_OFFSET(entry), + entry->vme_end - entry->vme_start, + ((entry->is_shared || + map->mapped_in_other_pmaps) + ? PMAP_NULL + : map->pmap), + VM_MAP_PAGE_SIZE(map), + entry->vme_start, + prot); + + assert(entry->wired_count == 0); + + /* + * Lock the VM object and re-check its status: if it's mapped + * in another address space, we could still be racing with + * another thread holding that other VM map exclusively. + */ + vm_object_lock(local_object); + if (local_object->true_share) { + /* object is already in proper state: no COW needed */ + assert(local_object->copy_strategy != + MEMORY_OBJECT_COPY_SYMMETRIC); + } else { + /* not true_share: ask for copy-on-write below */ + assert(local_object->copy_strategy == + MEMORY_OBJECT_COPY_SYMMETRIC); + entry->needs_copy = TRUE; + } + vm_object_unlock(local_object); + + vm_map_lock_write_to_read(map); + } + + if (entry->needs_copy) { + /* + * Honor copy-on-write for COPY_SYMMETRIC + * strategy. + */ + vm_map_t local_map; + vm_object_t object; + vm_object_offset_t new_offset; + vm_prot_t prot; + boolean_t wired; + vm_map_version_t version; + vm_map_t real_map; + vm_prot_t fault_type; + + if (entry->vme_start < VM_MAP_TRUNC_PAGE(offset, VM_MAP_PAGE_MASK(map)) || + entry->vme_end > VM_MAP_ROUND_PAGE(offset + *upl_size, VM_MAP_PAGE_MASK(map))) { + /* + * Clip the requested range first to minimize the + * amount of potential copying... + */ + if (vm_map_lock_read_to_write(map)) { + goto REDISCOVER_ENTRY; + } + vm_map_lock_assert_exclusive(map); + assert(VME_OBJECT(entry) == local_object); + vm_map_clip_start(map, entry, + VM_MAP_TRUNC_PAGE(offset, VM_MAP_PAGE_MASK(map))); + vm_map_clip_end(map, entry, + VM_MAP_ROUND_PAGE(offset + *upl_size, VM_MAP_PAGE_MASK(map))); + vm_map_lock_write_to_read(map); + } + + local_map = map; + + if (caller_flags & UPL_COPYOUT_FROM) { + fault_type = VM_PROT_READ | VM_PROT_COPY; + vm_counters.create_upl_extra_cow++; + vm_counters.create_upl_extra_cow_pages += + (entry->vme_end - entry->vme_start) / PAGE_SIZE; + } else { + fault_type = VM_PROT_WRITE; + } + if (vm_map_lookup_locked(&local_map, + offset, fault_type, + OBJECT_LOCK_EXCLUSIVE, + &version, &object, + &new_offset, &prot, &wired, + NULL, + &real_map, NULL) != KERN_SUCCESS) { + if (fault_type == VM_PROT_WRITE) { + vm_counters.create_upl_lookup_failure_write++; + } else { + vm_counters.create_upl_lookup_failure_copy++; + } + vm_map_unlock_read(local_map); + ret = KERN_FAILURE; + goto done; + } + if (real_map != local_map) { + vm_map_unlock(real_map); + } + vm_map_unlock_read(local_map); + + vm_object_unlock(object); + + goto REDISCOVER_ENTRY; + } + + if (entry->is_sub_map) { + vm_map_t submap; + + submap = VME_SUBMAP(entry); + local_start = entry->vme_start; + local_offset = (vm_map_offset_t)VME_OFFSET(entry); + + vm_map_reference(submap); + vm_map_unlock_read(map); + + DEBUG4K_UPL("map %p offset 0x%llx (0x%llx) size 0x%x (adjusted 0x%llx original 0x%llx) offset_in_mapped_page 0x%llx submap %p\n", map, (uint64_t)offset, (uint64_t)original_offset, *upl_size, (uint64_t)adjusted_size, (uint64_t)original_size, offset_in_mapped_page, submap); + offset += offset_in_mapped_page; + *upl_size -= offset_in_mapped_page; + + if (release_map) { + vm_map_deallocate(map); + } + map = submap; + release_map = TRUE; + offset = local_offset + (offset - local_start); + goto start_with_map; + } + + if (sync_cow_data && + (VME_OBJECT(entry)->shadow || + VME_OBJECT(entry)->copy)) { + local_object = VME_OBJECT(entry); + local_start = entry->vme_start; + local_offset = (vm_map_offset_t)VME_OFFSET(entry); + + vm_object_reference(local_object); + vm_map_unlock_read(map); + + if (local_object->shadow && local_object->copy) { + vm_object_lock_request(local_object->shadow, + ((vm_object_offset_t) + ((offset - local_start) + + local_offset) + + local_object->vo_shadow_offset), + *upl_size, FALSE, + MEMORY_OBJECT_DATA_SYNC, + VM_PROT_NO_CHANGE); + } + sync_cow_data = FALSE; + vm_object_deallocate(local_object); + + goto REDISCOVER_ENTRY; + } + if (force_data_sync) { + local_object = VME_OBJECT(entry); + local_start = entry->vme_start; + local_offset = (vm_map_offset_t)VME_OFFSET(entry); + + vm_object_reference(local_object); + vm_map_unlock_read(map); + + vm_object_lock_request(local_object, + ((vm_object_offset_t) + ((offset - local_start) + + local_offset)), + (vm_object_size_t)*upl_size, + FALSE, + MEMORY_OBJECT_DATA_SYNC, + VM_PROT_NO_CHANGE); + + force_data_sync = FALSE; + vm_object_deallocate(local_object); + + goto REDISCOVER_ENTRY; + } + if (VME_OBJECT(entry)->private) { + *flags = UPL_DEV_MEMORY; + } else { + *flags = 0; + } + + if (VME_OBJECT(entry)->phys_contiguous) { + *flags |= UPL_PHYS_CONTIG; + } + + local_object = VME_OBJECT(entry); + local_offset = (vm_map_offset_t)VME_OFFSET(entry); + local_start = entry->vme_start; + + /* + * Wiring will copy the pages to the shadow object. + * The shadow object will not be code-signed so + * attempting to execute code from these copied pages + * would trigger a code-signing violation. + */ + if (entry->protection & VM_PROT_EXECUTE) { +#if MACH_ASSERT + printf("pid %d[%s] create_upl out of executable range from " + "0x%llx to 0x%llx: side effects may include " + "code-signing violations later on\n", + proc_selfpid(), + (current_task()->bsd_info + ? proc_name_address(current_task()->bsd_info) + : "?"), + (uint64_t) entry->vme_start, + (uint64_t) entry->vme_end); +#endif /* MACH_ASSERT */ + DTRACE_VM2(cs_executable_create_upl, + uint64_t, (uint64_t)entry->vme_start, + uint64_t, (uint64_t)entry->vme_end); + cs_executable_create_upl++; + } + + vm_object_lock(local_object); + + /* + * Ensure that this object is "true_share" and "copy_delay" now, + * while we're still holding the VM map lock. After we unlock the map, + * anything could happen to that mapping, including some copy-on-write + * activity. We need to make sure that the IOPL will point at the + * same memory as the mapping. + */ + if (local_object->true_share) { + assert(local_object->copy_strategy != + MEMORY_OBJECT_COPY_SYMMETRIC); + } else if (local_object != kernel_object && + local_object != compressor_object && + !local_object->phys_contiguous) { +#if VM_OBJECT_TRACKING_OP_TRUESHARE + if (!local_object->true_share && + vm_object_tracking_inited) { + void *bt[VM_OBJECT_TRACKING_BTDEPTH]; + int num = 0; + num = OSBacktrace(bt, + VM_OBJECT_TRACKING_BTDEPTH); + btlog_add_entry(vm_object_tracking_btlog, + local_object, + VM_OBJECT_TRACKING_OP_TRUESHARE, + bt, + num); + } +#endif /* VM_OBJECT_TRACKING_OP_TRUESHARE */ + local_object->true_share = TRUE; + if (local_object->copy_strategy == + MEMORY_OBJECT_COPY_SYMMETRIC) { + local_object->copy_strategy = MEMORY_OBJECT_COPY_DELAY; + } + } + + vm_object_reference_locked(local_object); + vm_object_unlock(local_object); + + vm_map_unlock_read(map); + + offset += offset_in_mapped_page; + assert(*upl_size > offset_in_mapped_page); + *upl_size -= offset_in_mapped_page; + + ret = vm_object_iopl_request(local_object, + ((vm_object_offset_t) + ((offset - local_start) + local_offset)), + *upl_size, + upl, + page_list, + count, + caller_flags, + tag); + vm_object_deallocate(local_object); + +done: + if (release_map) { + vm_map_deallocate(map); + } + + return ret; +} + +/* + * Internal routine to enter a UPL into a VM map. + * + * JMM - This should just be doable through the standard + * vm_map_enter() API. + */ +kern_return_t +vm_map_enter_upl( + vm_map_t map, + upl_t upl, + vm_map_offset_t *dst_addr) +{ + vm_map_size_t size; + vm_object_offset_t offset; + vm_map_offset_t addr; + vm_page_t m; + kern_return_t kr; + int isVectorUPL = 0, curr_upl = 0; + upl_t vector_upl = NULL; + vm_offset_t vector_upl_dst_addr = 0; + vm_map_t vector_upl_submap = NULL; + upl_offset_t subupl_offset = 0; + upl_size_t subupl_size = 0; + + if (upl == UPL_NULL) { + return KERN_INVALID_ARGUMENT; + } + + DEBUG4K_UPL("map %p upl %p flags 0x%x object %p offset 0x%llx size 0x%x \n", map, upl, upl->flags, upl->map_object, upl->u_offset, upl->u_size); + assert(map == kernel_map); + + if ((isVectorUPL = vector_upl_is_valid(upl))) { + int mapped = 0, valid_upls = 0; + vector_upl = upl; + + upl_lock(vector_upl); + for (curr_upl = 0; curr_upl < MAX_VECTOR_UPL_ELEMENTS; curr_upl++) { + upl = vector_upl_subupl_byindex(vector_upl, curr_upl ); + if (upl == NULL) { + continue; + } + valid_upls++; + if (UPL_PAGE_LIST_MAPPED & upl->flags) { + mapped++; + } + } + + if (mapped) { + if (mapped != valid_upls) { + panic("Only %d of the %d sub-upls within the Vector UPL are alread mapped\n", mapped, valid_upls); + } else { + upl_unlock(vector_upl); + return KERN_FAILURE; + } + } + + if (VM_MAP_PAGE_MASK(map) < PAGE_MASK) { + panic("TODO4K: vector UPL not implemented"); + } + + kr = kmem_suballoc(map, &vector_upl_dst_addr, + vector_upl->u_size, + FALSE, + VM_FLAGS_ANYWHERE, VM_MAP_KERNEL_FLAGS_NONE, VM_KERN_MEMORY_NONE, + &vector_upl_submap); + if (kr != KERN_SUCCESS) { + panic("Vector UPL submap allocation failed\n"); + } + map = vector_upl_submap; + vector_upl_set_submap(vector_upl, vector_upl_submap, vector_upl_dst_addr); + curr_upl = 0; + } else { + upl_lock(upl); + } + +process_upl_to_enter: + if (isVectorUPL) { + if (curr_upl == MAX_VECTOR_UPL_ELEMENTS) { + *dst_addr = vector_upl_dst_addr; + upl_unlock(vector_upl); + return KERN_SUCCESS; + } + upl = vector_upl_subupl_byindex(vector_upl, curr_upl++ ); + if (upl == NULL) { + goto process_upl_to_enter; + } + + vector_upl_get_iostate(vector_upl, upl, &subupl_offset, &subupl_size); + *dst_addr = (vm_map_offset_t)(vector_upl_dst_addr + (vm_map_offset_t)subupl_offset); + } else { + /* + * check to see if already mapped + */ + if (UPL_PAGE_LIST_MAPPED & upl->flags) { + upl_unlock(upl); + return KERN_FAILURE; + } + } + + size = upl_adjusted_size(upl, VM_MAP_PAGE_MASK(map)); + + if ((!(upl->flags & UPL_SHADOWED)) && + ((upl->flags & UPL_HAS_BUSY) || + !((upl->flags & (UPL_DEVICE_MEMORY | UPL_IO_WIRE)) || (upl->map_object->phys_contiguous)))) { + vm_object_t object; + vm_page_t alias_page; + vm_object_offset_t new_offset; + unsigned int pg_num; + wpl_array_t lite_list; + + if (upl->flags & UPL_INTERNAL) { + lite_list = (wpl_array_t) + ((((uintptr_t)upl) + sizeof(struct upl)) + + ((size / PAGE_SIZE) * sizeof(upl_page_info_t))); + } else { + lite_list = (wpl_array_t)(((uintptr_t)upl) + sizeof(struct upl)); + } + object = upl->map_object; + upl->map_object = vm_object_allocate(vm_object_round_page(size)); + + vm_object_lock(upl->map_object); + + upl->map_object->shadow = object; + upl->map_object->pageout = TRUE; + upl->map_object->can_persist = FALSE; + upl->map_object->copy_strategy = MEMORY_OBJECT_COPY_NONE; + upl->map_object->vo_shadow_offset = upl_adjusted_offset(upl, PAGE_MASK) - object->paging_offset; + assertf(page_aligned(upl->map_object->vo_shadow_offset), + "object %p shadow_offset 0x%llx", + upl->map_object, + (uint64_t)upl->map_object->vo_shadow_offset); + upl->map_object->wimg_bits = object->wimg_bits; + assertf(page_aligned(upl->map_object->vo_shadow_offset), + "object %p shadow_offset 0x%llx", + upl->map_object, upl->map_object->vo_shadow_offset); + offset = upl->map_object->vo_shadow_offset; + new_offset = 0; + size = upl_adjusted_size(upl, VM_MAP_PAGE_MASK(map)); + + upl->flags |= UPL_SHADOWED; + + while (size) { + pg_num = (unsigned int) (new_offset / PAGE_SIZE); + assert(pg_num == new_offset / PAGE_SIZE); + + if (lite_list[pg_num >> 5] & (1U << (pg_num & 31))) { + VM_PAGE_GRAB_FICTITIOUS(alias_page); + + vm_object_lock(object); + + m = vm_page_lookup(object, offset); + if (m == VM_PAGE_NULL) { + panic("vm_upl_map: page missing\n"); + } + + /* + * Convert the fictitious page to a private + * shadow of the real page. + */ + assert(alias_page->vmp_fictitious); + alias_page->vmp_fictitious = FALSE; + alias_page->vmp_private = TRUE; + alias_page->vmp_free_when_done = TRUE; + /* + * since m is a page in the upl it must + * already be wired or BUSY, so it's + * safe to assign the underlying physical + * page to the alias + */ + VM_PAGE_SET_PHYS_PAGE(alias_page, VM_PAGE_GET_PHYS_PAGE(m)); + + vm_object_unlock(object); + + vm_page_lockspin_queues(); + vm_page_wire(alias_page, VM_KERN_MEMORY_NONE, TRUE); + vm_page_unlock_queues(); + + vm_page_insert_wired(alias_page, upl->map_object, new_offset, VM_KERN_MEMORY_NONE); + + assert(!alias_page->vmp_wanted); + alias_page->vmp_busy = FALSE; + alias_page->vmp_absent = FALSE; + } + size -= PAGE_SIZE; + offset += PAGE_SIZE_64; + new_offset += PAGE_SIZE_64; + } + vm_object_unlock(upl->map_object); + } + if (upl->flags & UPL_SHADOWED) { + offset = 0; + } else { + offset = upl_adjusted_offset(upl, VM_MAP_PAGE_MASK(map)) - upl->map_object->paging_offset; + } + + size = upl_adjusted_size(upl, VM_MAP_PAGE_MASK(map)); + + vm_object_reference(upl->map_object); + + if (!isVectorUPL) { + *dst_addr = 0; + /* + * NEED A UPL_MAP ALIAS + */ + kr = vm_map_enter(map, dst_addr, (vm_map_size_t)size, (vm_map_offset_t) 0, + VM_FLAGS_ANYWHERE, VM_MAP_KERNEL_FLAGS_NONE, VM_KERN_MEMORY_OSFMK, + upl->map_object, offset, FALSE, + VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT); + + if (kr != KERN_SUCCESS) { + vm_object_deallocate(upl->map_object); + upl_unlock(upl); + return kr; + } + } else { + kr = vm_map_enter(map, dst_addr, (vm_map_size_t)size, (vm_map_offset_t) 0, + VM_FLAGS_FIXED, VM_MAP_KERNEL_FLAGS_NONE, VM_KERN_MEMORY_OSFMK, + upl->map_object, offset, FALSE, + VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT); + if (kr) { + panic("vm_map_enter failed for a Vector UPL\n"); + } + } + vm_object_lock(upl->map_object); + + for (addr = *dst_addr; size > 0; size -= PAGE_SIZE, addr += PAGE_SIZE) { + m = vm_page_lookup(upl->map_object, offset); + + if (m) { + m->vmp_pmapped = TRUE; + + /* CODE SIGNING ENFORCEMENT: page has been wpmapped, + * but only in kernel space. If this was on a user map, + * we'd have to set the wpmapped bit. */ + /* m->vmp_wpmapped = TRUE; */ + assert(map->pmap == kernel_pmap); + + PMAP_ENTER(map->pmap, addr, m, VM_PROT_DEFAULT, VM_PROT_NONE, 0, TRUE, kr); + + assert(kr == KERN_SUCCESS); +#if KASAN + kasan_notify_address(addr, PAGE_SIZE_64); +#endif + } + offset += PAGE_SIZE_64; + } + vm_object_unlock(upl->map_object); + + /* + * hold a reference for the mapping + */ + upl->ref_count++; + upl->flags |= UPL_PAGE_LIST_MAPPED; + upl->kaddr = (vm_offset_t) *dst_addr; + assert(upl->kaddr == *dst_addr); + + if (isVectorUPL) { + goto process_upl_to_enter; + } + + if (!isVectorUPL) { + vm_map_offset_t addr_adjustment; + + addr_adjustment = (vm_map_offset_t)(upl->u_offset - upl_adjusted_offset(upl, VM_MAP_PAGE_MASK(map))); + if (addr_adjustment) { + assert(VM_MAP_PAGE_MASK(map) != PAGE_MASK); + DEBUG4K_UPL("dst_addr 0x%llx (+ 0x%llx) -> 0x%llx\n", (uint64_t)*dst_addr, (uint64_t)addr_adjustment, (uint64_t)(*dst_addr + addr_adjustment)); + *dst_addr += addr_adjustment; + } + } + + upl_unlock(upl); + + return KERN_SUCCESS; +} + +/* + * Internal routine to remove a UPL mapping from a VM map. + * + * XXX - This should just be doable through a standard + * vm_map_remove() operation. Otherwise, implicit clean-up + * of the target map won't be able to correctly remove + * these (and release the reference on the UPL). Having + * to do this means we can't map these into user-space + * maps yet. + */ +kern_return_t +vm_map_remove_upl( + vm_map_t map, + upl_t upl) +{ + vm_address_t addr; + upl_size_t size; + int isVectorUPL = 0, curr_upl = 0; + upl_t vector_upl = NULL; + + if (upl == UPL_NULL) { + return KERN_INVALID_ARGUMENT; + } + + if ((isVectorUPL = vector_upl_is_valid(upl))) { + int unmapped = 0, valid_upls = 0; + vector_upl = upl; + upl_lock(vector_upl); + for (curr_upl = 0; curr_upl < MAX_VECTOR_UPL_ELEMENTS; curr_upl++) { + upl = vector_upl_subupl_byindex(vector_upl, curr_upl ); + if (upl == NULL) { + continue; + } + valid_upls++; + if (!(UPL_PAGE_LIST_MAPPED & upl->flags)) { + unmapped++; + } + } + + if (unmapped) { + if (unmapped != valid_upls) { + panic("%d of the %d sub-upls within the Vector UPL is/are not mapped\n", unmapped, valid_upls); + } else { + upl_unlock(vector_upl); + return KERN_FAILURE; + } + } + curr_upl = 0; + } else { + upl_lock(upl); + } + +process_upl_to_remove: + if (isVectorUPL) { + if (curr_upl == MAX_VECTOR_UPL_ELEMENTS) { + vm_map_t v_upl_submap; + vm_offset_t v_upl_submap_dst_addr; + vector_upl_get_submap(vector_upl, &v_upl_submap, &v_upl_submap_dst_addr); + + vm_map_remove(map, v_upl_submap_dst_addr, + v_upl_submap_dst_addr + vector_upl->u_size, + VM_MAP_REMOVE_NO_FLAGS); + vm_map_deallocate(v_upl_submap); + upl_unlock(vector_upl); + return KERN_SUCCESS; + } + + upl = vector_upl_subupl_byindex(vector_upl, curr_upl++ ); + if (upl == NULL) { + goto process_upl_to_remove; + } + } + + if (upl->flags & UPL_PAGE_LIST_MAPPED) { + addr = upl->kaddr; + size = upl_adjusted_size(upl, VM_MAP_PAGE_MASK(map)); + + assert(upl->ref_count > 1); + upl->ref_count--; /* removing mapping ref */ + + upl->flags &= ~UPL_PAGE_LIST_MAPPED; + upl->kaddr = (vm_offset_t) 0; + + if (!isVectorUPL) { + upl_unlock(upl); + + vm_map_remove( + map, + vm_map_trunc_page(addr, + VM_MAP_PAGE_MASK(map)), + vm_map_round_page(addr + size, + VM_MAP_PAGE_MASK(map)), + VM_MAP_REMOVE_NO_FLAGS); + return KERN_SUCCESS; + } else { + /* + * If it's a Vectored UPL, we'll be removing the entire + * submap anyways, so no need to remove individual UPL + * element mappings from within the submap + */ + goto process_upl_to_remove; + } + } + upl_unlock(upl); + + return KERN_FAILURE; +} + + +kern_return_t +upl_commit_range( + upl_t upl, + upl_offset_t offset, + upl_size_t size, + int flags, + upl_page_info_t *page_list, + mach_msg_type_number_t count, + boolean_t *empty) +{ + upl_size_t xfer_size, subupl_size; + vm_object_t shadow_object; + vm_object_t object; + vm_object_t m_object; + vm_object_offset_t target_offset; + upl_offset_t subupl_offset = offset; + int entry; + wpl_array_t lite_list; + int occupied; + int clear_refmod = 0; + int pgpgout_count = 0; + struct vm_page_delayed_work dw_array; + struct vm_page_delayed_work *dwp, *dwp_start; + bool dwp_finish_ctx = TRUE; + int dw_count; + int dw_limit; + int isVectorUPL = 0; + upl_t vector_upl = NULL; + boolean_t should_be_throttled = FALSE; + + vm_page_t nxt_page = VM_PAGE_NULL; + int fast_path_possible = 0; + int fast_path_full_commit = 0; + int throttle_page = 0; + int unwired_count = 0; + int local_queue_count = 0; + vm_page_t first_local, last_local; + vm_object_offset_t obj_start, obj_end, obj_offset; + kern_return_t kr = KERN_SUCCESS; + +// DEBUG4K_UPL("upl %p (u_offset 0x%llx u_size 0x%llx) object %p offset 0x%llx size 0x%llx flags 0x%x\n", upl, (uint64_t)upl->u_offset, (uint64_t)upl->u_size, upl->map_object, (uint64_t)offset, (uint64_t)size, flags); + + dwp_start = dwp = NULL; + + subupl_size = size; + *empty = FALSE; + + if (upl == UPL_NULL) { + return KERN_INVALID_ARGUMENT; + } + + dw_count = 0; + dw_limit = DELAYED_WORK_LIMIT(DEFAULT_DELAYED_WORK_LIMIT); + dwp_start = vm_page_delayed_work_get_ctx(); + if (dwp_start == NULL) { + dwp_start = &dw_array; + dw_limit = 1; + dwp_finish_ctx = FALSE; + } + + dwp = dwp_start; + + if (count == 0) { + page_list = NULL; + } + + if ((isVectorUPL = vector_upl_is_valid(upl))) { + vector_upl = upl; + upl_lock(vector_upl); + } else { + upl_lock(upl); + } + +process_upl_to_commit: + + if (isVectorUPL) { + size = subupl_size; + offset = subupl_offset; + if (size == 0) { + upl_unlock(vector_upl); + kr = KERN_SUCCESS; + goto done; + } + upl = vector_upl_subupl_byoffset(vector_upl, &offset, &size); + if (upl == NULL) { + upl_unlock(vector_upl); + kr = KERN_FAILURE; + goto done; + } + page_list = UPL_GET_INTERNAL_PAGE_LIST_SIMPLE(upl); + subupl_size -= size; + subupl_offset += size; + } + +#if UPL_DEBUG + if (upl->upl_commit_index < UPL_DEBUG_COMMIT_RECORDS) { + (void) OSBacktrace(&upl->upl_commit_records[upl->upl_commit_index].c_retaddr[0], UPL_DEBUG_STACK_FRAMES); + + upl->upl_commit_records[upl->upl_commit_index].c_beg = offset; + upl->upl_commit_records[upl->upl_commit_index].c_end = (offset + size); + + upl->upl_commit_index++; + } +#endif + if (upl->flags & UPL_DEVICE_MEMORY) { + xfer_size = 0; + } else if ((offset + size) <= upl_adjusted_size(upl, PAGE_MASK)) { + xfer_size = size; + } else { + if (!isVectorUPL) { + upl_unlock(upl); + } else { + upl_unlock(vector_upl); + } + DEBUG4K_ERROR("upl %p (u_offset 0x%llx u_size 0x%x) offset 0x%x size 0x%x\n", upl, upl->u_offset, upl->u_size, offset, size); + kr = KERN_FAILURE; + goto done; + } + if (upl->flags & UPL_SET_DIRTY) { + flags |= UPL_COMMIT_SET_DIRTY; + } + if (upl->flags & UPL_CLEAR_DIRTY) { + flags |= UPL_COMMIT_CLEAR_DIRTY; + } + + if (upl->flags & UPL_INTERNAL) { + lite_list = (wpl_array_t) ((((uintptr_t)upl) + sizeof(struct upl)) + + ((upl_adjusted_size(upl, PAGE_MASK) / PAGE_SIZE) * sizeof(upl_page_info_t))); + } else { + lite_list = (wpl_array_t) (((uintptr_t)upl) + sizeof(struct upl)); + } + + object = upl->map_object; + + if (upl->flags & UPL_SHADOWED) { + vm_object_lock(object); + shadow_object = object->shadow; + } else { + shadow_object = object; + } + entry = offset / PAGE_SIZE; + target_offset = (vm_object_offset_t)offset; + + if (upl->flags & UPL_KERNEL_OBJECT) { + vm_object_lock_shared(shadow_object); + } else { + vm_object_lock(shadow_object); + } + + VM_OBJECT_WIRED_PAGE_UPDATE_START(shadow_object); + + if (upl->flags & UPL_ACCESS_BLOCKED) { + assert(shadow_object->blocked_access); + shadow_object->blocked_access = FALSE; + vm_object_wakeup(object, VM_OBJECT_EVENT_UNBLOCKED); + } + + if (shadow_object->code_signed) { + /* + * CODE SIGNING: + * If the object is code-signed, do not let this UPL tell + * us if the pages are valid or not. Let the pages be + * validated by VM the normal way (when they get mapped or + * copied). + */ + flags &= ~UPL_COMMIT_CS_VALIDATED; + } + if (!page_list) { + /* + * No page list to get the code-signing info from !? + */ + flags &= ~UPL_COMMIT_CS_VALIDATED; + } + if (!VM_DYNAMIC_PAGING_ENABLED() && shadow_object->internal) { + should_be_throttled = TRUE; + } + + if ((upl->flags & UPL_IO_WIRE) && + !(flags & UPL_COMMIT_FREE_ABSENT) && + !isVectorUPL && + shadow_object->purgable != VM_PURGABLE_VOLATILE && + shadow_object->purgable != VM_PURGABLE_EMPTY) { + if (!vm_page_queue_empty(&shadow_object->memq)) { + if (size == shadow_object->vo_size) { + nxt_page = (vm_page_t)vm_page_queue_first(&shadow_object->memq); + fast_path_full_commit = 1; + } + fast_path_possible = 1; + + if (!VM_DYNAMIC_PAGING_ENABLED() && shadow_object->internal && + (shadow_object->purgable == VM_PURGABLE_DENY || + shadow_object->purgable == VM_PURGABLE_NONVOLATILE || + shadow_object->purgable == VM_PURGABLE_VOLATILE)) { + throttle_page = 1; + } + } + } + first_local = VM_PAGE_NULL; + last_local = VM_PAGE_NULL; + + obj_start = target_offset + upl->u_offset - shadow_object->paging_offset; + obj_end = obj_start + xfer_size; + obj_start = vm_object_trunc_page(obj_start); + obj_end = vm_object_round_page(obj_end); + for (obj_offset = obj_start; + obj_offset < obj_end; + obj_offset += PAGE_SIZE) { + vm_page_t t, m; + + dwp->dw_mask = 0; + clear_refmod = 0; + + m = VM_PAGE_NULL; + + if (upl->flags & UPL_LITE) { + unsigned int pg_num; + + if (nxt_page != VM_PAGE_NULL) { + m = nxt_page; + nxt_page = (vm_page_t)vm_page_queue_next(&nxt_page->vmp_listq); + target_offset = m->vmp_offset; + } + pg_num = (unsigned int) (target_offset / PAGE_SIZE); + assert(pg_num == target_offset / PAGE_SIZE); + + if (lite_list[pg_num >> 5] & (1U << (pg_num & 31))) { + lite_list[pg_num >> 5] &= ~(1U << (pg_num & 31)); + + if (!(upl->flags & UPL_KERNEL_OBJECT) && m == VM_PAGE_NULL) { + m = vm_page_lookup(shadow_object, obj_offset); + } + } else { + m = NULL; + } + } + if (upl->flags & UPL_SHADOWED) { + if ((t = vm_page_lookup(object, target_offset)) != VM_PAGE_NULL) { + t->vmp_free_when_done = FALSE; + + VM_PAGE_FREE(t); + + if (!(upl->flags & UPL_KERNEL_OBJECT) && m == VM_PAGE_NULL) { + m = vm_page_lookup(shadow_object, target_offset + object->vo_shadow_offset); + } + } + } + if (m == VM_PAGE_NULL) { + goto commit_next_page; + } + + m_object = VM_PAGE_OBJECT(m); + + if (m->vmp_q_state == VM_PAGE_USED_BY_COMPRESSOR) { + assert(m->vmp_busy); + + dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); + goto commit_next_page; + } + + if (flags & UPL_COMMIT_CS_VALIDATED) { + /* + * CODE SIGNING: + * Set the code signing bits according to + * what the UPL says they should be. + */ + m->vmp_cs_validated |= page_list[entry].cs_validated; + m->vmp_cs_tainted |= page_list[entry].cs_tainted; + m->vmp_cs_nx |= page_list[entry].cs_nx; + } + if (flags & UPL_COMMIT_WRITTEN_BY_KERNEL) { + m->vmp_written_by_kernel = TRUE; + } + + if (upl->flags & UPL_IO_WIRE) { + if (page_list) { + page_list[entry].phys_addr = 0; + } + + if (flags & UPL_COMMIT_SET_DIRTY) { + SET_PAGE_DIRTY(m, FALSE); + } else if (flags & UPL_COMMIT_CLEAR_DIRTY) { + m->vmp_dirty = FALSE; + + if (!(flags & UPL_COMMIT_CS_VALIDATED) && + m->vmp_cs_validated && + m->vmp_cs_tainted != VMP_CS_ALL_TRUE) { + /* + * CODE SIGNING: + * This page is no longer dirty + * but could have been modified, + * so it will need to be + * re-validated. + */ + m->vmp_cs_validated = VMP_CS_ALL_FALSE; + + VM_PAGEOUT_DEBUG(vm_cs_validated_resets, 1); + + pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m)); + } + clear_refmod |= VM_MEM_MODIFIED; + } + if (upl->flags & UPL_ACCESS_BLOCKED) { + /* + * We blocked access to the pages in this UPL. + * Clear the "busy" bit and wake up any waiter + * for this page. + */ + dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); + } + if (fast_path_possible) { + assert(m_object->purgable != VM_PURGABLE_EMPTY); + assert(m_object->purgable != VM_PURGABLE_VOLATILE); + if (m->vmp_absent) { + assert(m->vmp_q_state == VM_PAGE_NOT_ON_Q); + assert(m->vmp_wire_count == 0); + assert(m->vmp_busy); + + m->vmp_absent = FALSE; + dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); + } else { + if (m->vmp_wire_count == 0) { + panic("wire_count == 0, m = %p, obj = %p\n", m, shadow_object); + } + assert(m->vmp_q_state == VM_PAGE_IS_WIRED); + + /* + * XXX FBDP need to update some other + * counters here (purgeable_wired_count) + * (ledgers), ... + */ + assert(m->vmp_wire_count > 0); + m->vmp_wire_count--; + + if (m->vmp_wire_count == 0) { + m->vmp_q_state = VM_PAGE_NOT_ON_Q; + unwired_count++; + } + } + if (m->vmp_wire_count == 0) { + assert(m->vmp_pageq.next == 0 && m->vmp_pageq.prev == 0); + + if (last_local == VM_PAGE_NULL) { + assert(first_local == VM_PAGE_NULL); + + last_local = m; + first_local = m; + } else { + assert(first_local != VM_PAGE_NULL); + + m->vmp_pageq.next = VM_PAGE_CONVERT_TO_QUEUE_ENTRY(first_local); + first_local->vmp_pageq.prev = VM_PAGE_CONVERT_TO_QUEUE_ENTRY(m); + first_local = m; + } + local_queue_count++; + + if (throttle_page) { + m->vmp_q_state = VM_PAGE_ON_THROTTLED_Q; + } else { + if (flags & UPL_COMMIT_INACTIVATE) { + if (shadow_object->internal) { + m->vmp_q_state = VM_PAGE_ON_INACTIVE_INTERNAL_Q; + } else { + m->vmp_q_state = VM_PAGE_ON_INACTIVE_EXTERNAL_Q; + } + } else { + m->vmp_q_state = VM_PAGE_ON_ACTIVE_Q; + } + } + } + } else { + if (flags & UPL_COMMIT_INACTIVATE) { + dwp->dw_mask |= DW_vm_page_deactivate_internal; + clear_refmod |= VM_MEM_REFERENCED; + } + if (m->vmp_absent) { + if (flags & UPL_COMMIT_FREE_ABSENT) { + dwp->dw_mask |= DW_vm_page_free; + } else { + m->vmp_absent = FALSE; + dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); + + if (!(dwp->dw_mask & DW_vm_page_deactivate_internal)) { + dwp->dw_mask |= DW_vm_page_activate; + } + } + } else { + dwp->dw_mask |= DW_vm_page_unwire; + } + } + goto commit_next_page; + } + assert(m->vmp_q_state != VM_PAGE_USED_BY_COMPRESSOR); + + if (page_list) { + page_list[entry].phys_addr = 0; + } + + /* + * make sure to clear the hardware + * modify or reference bits before + * releasing the BUSY bit on this page + * otherwise we risk losing a legitimate + * change of state + */ + if (flags & UPL_COMMIT_CLEAR_DIRTY) { + m->vmp_dirty = FALSE; + + clear_refmod |= VM_MEM_MODIFIED; + } + if (m->vmp_laundry) { + dwp->dw_mask |= DW_vm_pageout_throttle_up; + } + + if (VM_PAGE_WIRED(m)) { + m->vmp_free_when_done = FALSE; + } + + if (!(flags & UPL_COMMIT_CS_VALIDATED) && + m->vmp_cs_validated && + m->vmp_cs_tainted != VMP_CS_ALL_TRUE) { + /* + * CODE SIGNING: + * This page is no longer dirty + * but could have been modified, + * so it will need to be + * re-validated. + */ + m->vmp_cs_validated = VMP_CS_ALL_FALSE; + + VM_PAGEOUT_DEBUG(vm_cs_validated_resets, 1); + + pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m)); + } + if (m->vmp_overwriting) { + /* + * the (COPY_OUT_FROM == FALSE) request_page_list case + */ + if (m->vmp_busy) { +#if CONFIG_PHANTOM_CACHE + if (m->vmp_absent && !m_object->internal) { + dwp->dw_mask |= DW_vm_phantom_cache_update; + } +#endif + m->vmp_absent = FALSE; + + dwp->dw_mask |= DW_clear_busy; + } else { + /* + * alternate (COPY_OUT_FROM == FALSE) page_list case + * Occurs when the original page was wired + * at the time of the list request + */ + assert(VM_PAGE_WIRED(m)); + + dwp->dw_mask |= DW_vm_page_unwire; /* reactivates */ + } + m->vmp_overwriting = FALSE; + } + m->vmp_cleaning = FALSE; + + if (m->vmp_free_when_done) { + /* + * With the clean queue enabled, UPL_PAGEOUT should + * no longer set the pageout bit. Its pages now go + * to the clean queue. + * + * We don't use the cleaned Q anymore and so this + * assert isn't correct. The code for the clean Q + * still exists and might be used in the future. If we + * go back to the cleaned Q, we will re-enable this + * assert. + * + * assert(!(upl->flags & UPL_PAGEOUT)); + */ + assert(!m_object->internal); + + m->vmp_free_when_done = FALSE; + + if ((flags & UPL_COMMIT_SET_DIRTY) || + (m->vmp_pmapped && (pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m)) & VM_MEM_MODIFIED))) { + /* + * page was re-dirtied after we started + * the pageout... reactivate it since + * we don't know whether the on-disk + * copy matches what is now in memory + */ + SET_PAGE_DIRTY(m, FALSE); + + dwp->dw_mask |= DW_vm_page_activate | DW_PAGE_WAKEUP; + + if (upl->flags & UPL_PAGEOUT) { + VM_STAT_INCR(reactivations); + DTRACE_VM2(pgrec, int, 1, (uint64_t *), NULL); + } + } else { + /* + * page has been successfully cleaned + * go ahead and free it for other use + */ + if (m_object->internal) { + DTRACE_VM2(anonpgout, int, 1, (uint64_t *), NULL); + } else { + DTRACE_VM2(fspgout, int, 1, (uint64_t *), NULL); + } + m->vmp_dirty = FALSE; + m->vmp_busy = TRUE; + + dwp->dw_mask |= DW_vm_page_free; + } + goto commit_next_page; + } + /* + * It is a part of the semantic of COPYOUT_FROM + * UPLs that a commit implies cache sync + * between the vm page and the backing store + * this can be used to strip the precious bit + * as well as clean + */ + if ((upl->flags & UPL_PAGE_SYNC_DONE) || (flags & UPL_COMMIT_CLEAR_PRECIOUS)) { + m->vmp_precious = FALSE; + } + + if (flags & UPL_COMMIT_SET_DIRTY) { + SET_PAGE_DIRTY(m, FALSE); + } else { + m->vmp_dirty = FALSE; + } + + /* with the clean queue on, move *all* cleaned pages to the clean queue */ + if (hibernate_cleaning_in_progress == FALSE && !m->vmp_dirty && (upl->flags & UPL_PAGEOUT)) { + pgpgout_count++; + + VM_STAT_INCR(pageouts); + DTRACE_VM2(pgout, int, 1, (uint64_t *), NULL); + + dwp->dw_mask |= DW_enqueue_cleaned; + } else if (should_be_throttled == TRUE && (m->vmp_q_state == VM_PAGE_NOT_ON_Q)) { + /* + * page coming back in from being 'frozen'... + * it was dirty before it was frozen, so keep it so + * the vm_page_activate will notice that it really belongs + * on the throttle queue and put it there + */ + SET_PAGE_DIRTY(m, FALSE); + dwp->dw_mask |= DW_vm_page_activate; + } else { + if ((flags & UPL_COMMIT_INACTIVATE) && !m->vmp_clustered && (m->vmp_q_state != VM_PAGE_ON_SPECULATIVE_Q)) { + dwp->dw_mask |= DW_vm_page_deactivate_internal; + clear_refmod |= VM_MEM_REFERENCED; + } else if (!VM_PAGE_PAGEABLE(m)) { + if (m->vmp_clustered || (flags & UPL_COMMIT_SPECULATE)) { + dwp->dw_mask |= DW_vm_page_speculate; + } else if (m->vmp_reference) { + dwp->dw_mask |= DW_vm_page_activate; + } else { + dwp->dw_mask |= DW_vm_page_deactivate_internal; + clear_refmod |= VM_MEM_REFERENCED; + } + } + } + if (upl->flags & UPL_ACCESS_BLOCKED) { + /* + * We blocked access to the pages in this URL. + * Clear the "busy" bit on this page before we + * wake up any waiter. + */ + dwp->dw_mask |= DW_clear_busy; + } + /* + * Wakeup any thread waiting for the page to be un-cleaning. + */ + dwp->dw_mask |= DW_PAGE_WAKEUP; - vm_map_remove(map, v_upl_submap_dst_addr, v_upl_submap_dst_addr + vector_upl->size, VM_MAP_NO_FLAGS); - vm_map_deallocate(v_upl_submap); - upl_unlock(vector_upl); - return KERN_SUCCESS; +commit_next_page: + if (clear_refmod) { + pmap_clear_refmod(VM_PAGE_GET_PHYS_PAGE(m), clear_refmod); } - upl = vector_upl_subupl_byindex(vector_upl, curr_upl++ ); - if(upl == NULL) - goto process_upl_to_remove; - } + target_offset += PAGE_SIZE_64; + xfer_size -= PAGE_SIZE; + entry++; - if (upl->flags & UPL_PAGE_LIST_MAPPED) { - addr = upl->kaddr; - size = upl->size; + if (dwp->dw_mask) { + if (dwp->dw_mask & ~(DW_clear_busy | DW_PAGE_WAKEUP)) { + VM_PAGE_ADD_DELAYED_WORK(dwp, m, dw_count); - assert(upl->ref_count > 1); - upl->ref_count--; /* removing mapping ref */ + if (dw_count >= dw_limit) { + vm_page_do_delayed_work(shadow_object, VM_KERN_MEMORY_NONE, dwp_start, dw_count); - upl->flags &= ~UPL_PAGE_LIST_MAPPED; - upl->kaddr = (vm_offset_t) 0; - - if(!isVectorUPL) { - upl_unlock(upl); - - vm_map_remove(map, - vm_map_trunc_page(addr), - vm_map_round_page(addr + size), - VM_MAP_NO_FLAGS); - - return KERN_SUCCESS; - } - else { - /* - * If it's a Vectored UPL, we'll be removing the entire - * submap anyways, so no need to remove individual UPL - * element mappings from within the submap - */ - goto process_upl_to_remove; + dwp = dwp_start; + dw_count = 0; + } + } else { + if (dwp->dw_mask & DW_clear_busy) { + m->vmp_busy = FALSE; + } + + if (dwp->dw_mask & DW_PAGE_WAKEUP) { + PAGE_WAKEUP(m); + } + } } } - upl_unlock(upl); + if (dw_count) { + vm_page_do_delayed_work(shadow_object, VM_KERN_MEMORY_NONE, dwp_start, dw_count); + dwp = dwp_start; + dw_count = 0; + } - return KERN_FAILURE; -} + if (fast_path_possible) { + assert(shadow_object->purgable != VM_PURGABLE_VOLATILE); + assert(shadow_object->purgable != VM_PURGABLE_EMPTY); -static void -dw_do_work( - vm_object_t object, - struct dw *dwp, - int dw_count) -{ - int j; - boolean_t held_as_spin = TRUE; + if (local_queue_count || unwired_count) { + if (local_queue_count) { + vm_page_t first_target; + vm_page_queue_head_t *target_queue; - /* - * pageout_scan takes the vm_page_lock_queues first - * then tries for the object lock... to avoid what - * is effectively a lock inversion, we'll go to the - * trouble of taking them in that same order... otherwise - * if this object contains the majority of the pages resident - * in the UBC (or a small set of large objects actively being - * worked on contain the majority of the pages), we could - * cause the pageout_scan thread to 'starve' in its attempt - * to find pages to move to the free queue, since it has to - * successfully acquire the object lock of any candidate page - * before it can steal/clean it. - */ - if (!vm_page_trylockspin_queues()) { - vm_object_unlock(object); + if (throttle_page) { + target_queue = &vm_page_queue_throttled; + } else { + if (flags & UPL_COMMIT_INACTIVATE) { + if (shadow_object->internal) { + target_queue = &vm_page_queue_anonymous; + } else { + target_queue = &vm_page_queue_inactive; + } + } else { + target_queue = &vm_page_queue_active; + } + } + /* + * Transfer the entire local queue to a regular LRU page queues. + */ + vm_page_lockspin_queues(); - vm_page_lockspin_queues(); + first_target = (vm_page_t) vm_page_queue_first(target_queue); - for (j = 0; ; j++) { - if (!vm_object_lock_avoid(object) && - _vm_object_lock_try(object)) - break; + if (vm_page_queue_empty(target_queue)) { + target_queue->prev = VM_PAGE_CONVERT_TO_QUEUE_ENTRY(last_local); + } else { + first_target->vmp_pageq.prev = VM_PAGE_CONVERT_TO_QUEUE_ENTRY(last_local); + } + + target_queue->next = VM_PAGE_CONVERT_TO_QUEUE_ENTRY(first_local); + first_local->vmp_pageq.prev = VM_PAGE_CONVERT_TO_QUEUE_ENTRY(target_queue); + last_local->vmp_pageq.next = VM_PAGE_CONVERT_TO_QUEUE_ENTRY(first_target); + + /* + * Adjust the global page counts. + */ + if (throttle_page) { + vm_page_throttled_count += local_queue_count; + } else { + if (flags & UPL_COMMIT_INACTIVATE) { + if (shadow_object->internal) { + vm_page_anonymous_count += local_queue_count; + } + vm_page_inactive_count += local_queue_count; + + token_new_pagecount += local_queue_count; + } else { + vm_page_active_count += local_queue_count; + } + + if (shadow_object->internal) { + vm_page_pageable_internal_count += local_queue_count; + } else { + vm_page_pageable_external_count += local_queue_count; + } + } + } else { + vm_page_lockspin_queues(); + } + if (unwired_count) { + vm_page_wire_count -= unwired_count; + VM_CHECK_MEMORYSTATUS; + } vm_page_unlock_queues(); - mutex_pause(j); - vm_page_lockspin_queues(); + + VM_OBJECT_WIRED_PAGE_COUNT(shadow_object, -unwired_count); } } - for (j = 0; j < dw_count; j++, dwp++) { + occupied = 1; - if (dwp->dw_mask & DW_vm_pageout_throttle_up) - vm_pageout_throttle_up(dwp->dw_m); + if (upl->flags & UPL_DEVICE_MEMORY) { + occupied = 0; + } else if (upl->flags & UPL_LITE) { + int pg_num; + int i; + + occupied = 0; - if (dwp->dw_mask & DW_vm_page_wire) - vm_page_wire(dwp->dw_m); - else if (dwp->dw_mask & DW_vm_page_unwire) - vm_page_unwire(dwp->dw_m); + if (!fast_path_full_commit) { + pg_num = upl_adjusted_size(upl, PAGE_MASK) / PAGE_SIZE; + pg_num = (pg_num + 31) >> 5; - if (dwp->dw_mask & DW_vm_page_free) { - if (held_as_spin == TRUE) { - vm_page_lockconvert_queues(); - held_as_spin = FALSE; + for (i = 0; i < pg_num; i++) { + if (lite_list[i] != 0) { + occupied = 1; + break; + } } - vm_page_free(dwp->dw_m); + } + } else { + if (vm_page_queue_empty(&upl->map_object->memq)) { + occupied = 0; + } + } + if (occupied == 0) { + /* + * If this UPL element belongs to a Vector UPL and is + * empty, then this is the right function to deallocate + * it. So go ahead set the *empty variable. The flag + * UPL_COMMIT_NOTIFY_EMPTY, from the caller's point of view + * should be considered relevant for the Vector UPL and not + * the internal UPLs. + */ + if ((upl->flags & UPL_COMMIT_NOTIFY_EMPTY) || isVectorUPL) { + *empty = TRUE; + } + + if (object == shadow_object && !(upl->flags & UPL_KERNEL_OBJECT)) { + /* + * this is not a paging object + * so we need to drop the paging reference + * that was taken when we created the UPL + * against this object + */ + vm_object_activity_end(shadow_object); + vm_object_collapse(shadow_object, 0, TRUE); } else { - if (dwp->dw_mask & DW_vm_page_deactivate_internal) - vm_page_deactivate_internal(dwp->dw_m, FALSE); - else if (dwp->dw_mask & DW_vm_page_activate) - vm_page_activate(dwp->dw_m); - else if (dwp->dw_mask & DW_vm_page_speculate) - vm_page_speculate(dwp->dw_m, TRUE); - else if (dwp->dw_mask & DW_vm_page_lru) - vm_page_lru(dwp->dw_m); - - if (dwp->dw_mask & DW_set_reference) - dwp->dw_m->reference = TRUE; - else if (dwp->dw_mask & DW_clear_reference) - dwp->dw_m->reference = FALSE; - - if (dwp->dw_mask & DW_clear_busy) - dwp->dw_m->busy = FALSE; - - if (dwp->dw_mask & DW_PAGE_WAKEUP) - PAGE_WAKEUP(dwp->dw_m); + /* + * we dontated the paging reference to + * the map object... vm_pageout_object_terminate + * will drop this reference + */ } } - vm_page_unlock_queues(); -} + VM_OBJECT_WIRED_PAGE_UPDATE_END(shadow_object, shadow_object->wire_tag); + vm_object_unlock(shadow_object); + if (object != shadow_object) { + vm_object_unlock(object); + } + + if (!isVectorUPL) { + upl_unlock(upl); + } else { + /* + * If we completed our operations on an UPL that is + * part of a Vectored UPL and if empty is TRUE, then + * we should go ahead and deallocate this UPL element. + * Then we check if this was the last of the UPL elements + * within that Vectored UPL. If so, set empty to TRUE + * so that in ubc_upl_commit_range or ubc_upl_commit, we + * can go ahead and deallocate the Vector UPL too. + */ + if (*empty == TRUE) { + *empty = vector_upl_set_subupl(vector_upl, upl, 0); + upl_deallocate(upl); + } + goto process_upl_to_commit; + } + if (pgpgout_count) { + DTRACE_VM2(pgpgout, int, pgpgout_count, (uint64_t *), NULL); + } + kr = KERN_SUCCESS; +done: + if (dwp_start && dwp_finish_ctx) { + vm_page_delayed_work_finish_ctx(dwp_start); + dwp_start = dwp = NULL; + } + return kr; +} kern_return_t -upl_commit_range( - upl_t upl, - upl_offset_t offset, - upl_size_t size, - int flags, - upl_page_info_t *page_list, - mach_msg_type_number_t count, - boolean_t *empty) +upl_abort_range( + upl_t upl, + upl_offset_t offset, + upl_size_t size, + int error, + boolean_t *empty) { - upl_size_t xfer_size, subupl_size = size; - vm_object_t shadow_object; - vm_object_t object; - vm_object_offset_t target_offset; - upl_offset_t subupl_offset = offset; - int entry; - wpl_array_t lite_list; - int occupied; - int clear_refmod = 0; - int pgpgout_count = 0; - struct dw dw_array[DELAYED_WORK_LIMIT]; - struct dw *dwp; - int dw_count, isVectorUPL = 0; - upl_t vector_upl = NULL; - + upl_page_info_t *user_page_list = NULL; + upl_size_t xfer_size, subupl_size; + vm_object_t shadow_object; + vm_object_t object; + vm_object_offset_t target_offset; + upl_offset_t subupl_offset = offset; + int entry; + wpl_array_t lite_list; + int occupied; + struct vm_page_delayed_work dw_array; + struct vm_page_delayed_work *dwp, *dwp_start; + bool dwp_finish_ctx = TRUE; + int dw_count; + int dw_limit; + int isVectorUPL = 0; + upl_t vector_upl = NULL; + vm_object_offset_t obj_start, obj_end, obj_offset; + kern_return_t kr = KERN_SUCCESS; + +// DEBUG4K_UPL("upl %p (u_offset 0x%llx u_size 0x%llx) object %p offset 0x%llx size 0x%llx error 0x%x\n", upl, (uint64_t)upl->u_offset, (uint64_t)upl->u_size, upl->map_object, (uint64_t)offset, (uint64_t)size, error); + + dwp_start = dwp = NULL; + + subupl_size = size; *empty = FALSE; - if (upl == UPL_NULL) + if (upl == UPL_NULL) { return KERN_INVALID_ARGUMENT; + } - if (count == 0) - page_list = NULL; + if ((upl->flags & UPL_IO_WIRE) && !(error & UPL_ABORT_DUMP_PAGES)) { + return upl_commit_range(upl, offset, size, UPL_COMMIT_FREE_ABSENT, NULL, 0, empty); + } + + dw_count = 0; + dw_limit = DELAYED_WORK_LIMIT(DEFAULT_DELAYED_WORK_LIMIT); + dwp_start = vm_page_delayed_work_get_ctx(); + if (dwp_start == NULL) { + dwp_start = &dw_array; + dw_limit = 1; + dwp_finish_ctx = FALSE; + } + + dwp = dwp_start; - if((isVectorUPL = vector_upl_is_valid(upl))) { + if ((isVectorUPL = vector_upl_is_valid(upl))) { vector_upl = upl; upl_lock(vector_upl); - } - else + } else { upl_lock(upl); + } -process_upl_to_commit: - - if(isVectorUPL) { +process_upl_to_abort: + if (isVectorUPL) { size = subupl_size; offset = subupl_offset; - if(size == 0) { + if (size == 0) { upl_unlock(vector_upl); - return KERN_SUCCESS; + kr = KERN_SUCCESS; + goto done; } upl = vector_upl_subupl_byoffset(vector_upl, &offset, &size); - if(upl == NULL) { + if (upl == NULL) { upl_unlock(vector_upl); - return KERN_FAILURE; + kr = KERN_FAILURE; + goto done; } - page_list = UPL_GET_INTERNAL_PAGE_LIST_SIMPLE(upl); subupl_size -= size; subupl_offset += size; } + *empty = FALSE; + #if UPL_DEBUG if (upl->upl_commit_index < UPL_DEBUG_COMMIT_RECORDS) { (void) OSBacktrace(&upl->upl_commit_records[upl->upl_commit_index].c_retaddr[0], UPL_DEBUG_STACK_FRAMES); - + upl->upl_commit_records[upl->upl_commit_index].c_beg = offset; upl->upl_commit_records[upl->upl_commit_index].c_end = (offset + size); + upl->upl_commit_records[upl->upl_commit_index].c_aborted = 1; upl->upl_commit_index++; } #endif - if (upl->flags & UPL_DEVICE_MEMORY) + if (upl->flags & UPL_DEVICE_MEMORY) { xfer_size = 0; - else if ((offset + size) <= upl->size) - xfer_size = size; - else { - if(!isVectorUPL) + } else if ((offset + size) <= upl_adjusted_size(upl, PAGE_MASK)) { + xfer_size = size; + } else { + if (!isVectorUPL) { upl_unlock(upl); - else { + } else { upl_unlock(vector_upl); } - return KERN_FAILURE; + DEBUG4K_ERROR("upl %p (u_offset 0x%llx u_size 0x%x) offset 0x%x size 0x%x\n", upl, upl->u_offset, upl->u_size, offset, size); + kr = KERN_FAILURE; + goto done; } - if (upl->flags & UPL_CLEAR_DIRTY) - flags |= UPL_COMMIT_CLEAR_DIRTY; - - if (upl->flags & UPL_INTERNAL) - lite_list = (wpl_array_t) ((((uintptr_t)upl) + sizeof(struct upl)) - + ((upl->size/PAGE_SIZE) * sizeof(upl_page_info_t))); - else - lite_list = (wpl_array_t) (((uintptr_t)upl) + sizeof(struct upl)); + if (upl->flags & UPL_INTERNAL) { + lite_list = (wpl_array_t) + ((((uintptr_t)upl) + sizeof(struct upl)) + + ((upl_adjusted_size(upl, PAGE_MASK) / PAGE_SIZE) * sizeof(upl_page_info_t))); + user_page_list = (upl_page_info_t *) (((uintptr_t)upl) + sizeof(struct upl)); + } else { + lite_list = (wpl_array_t) + (((uintptr_t)upl) + sizeof(struct upl)); + } object = upl->map_object; if (upl->flags & UPL_SHADOWED) { - vm_object_lock(object); + vm_object_lock(object); shadow_object = object->shadow; } else { shadow_object = object; } - entry = offset/PAGE_SIZE; + + entry = offset / PAGE_SIZE; target_offset = (vm_object_offset_t)offset; - if (upl->flags & UPL_KERNEL_OBJECT) + if (upl->flags & UPL_KERNEL_OBJECT) { vm_object_lock_shared(shadow_object); - else + } else { vm_object_lock(shadow_object); + } if (upl->flags & UPL_ACCESS_BLOCKED) { assert(shadow_object->blocked_access); @@ -4601,376 +8165,220 @@ process_upl_to_commit: vm_object_wakeup(object, VM_OBJECT_EVENT_UNBLOCKED); } - if (shadow_object->code_signed) { - /* - * CODE SIGNING: - * If the object is code-signed, do not let this UPL tell - * us if the pages are valid or not. Let the pages be - * validated by VM the normal way (when they get mapped or - * copied). - */ - flags &= ~UPL_COMMIT_CS_VALIDATED; - } - if (! page_list) { - /* - * No page list to get the code-signing info from !? - */ - flags &= ~UPL_COMMIT_CS_VALIDATED; + if ((error & UPL_ABORT_DUMP_PAGES) && (upl->flags & UPL_KERNEL_OBJECT)) { + panic("upl_abort_range: kernel_object being DUMPED"); } - dwp = &dw_array[0]; - dw_count = 0; - - while (xfer_size) { - vm_page_t t, m; - - dwp->dw_mask = 0; - clear_refmod = 0; - - m = VM_PAGE_NULL; - - if (upl->flags & UPL_LITE) { - unsigned int pg_num; - - pg_num = (unsigned int) (target_offset/PAGE_SIZE); - assert(pg_num == target_offset/PAGE_SIZE); - - if (lite_list[pg_num>>5] & (1 << (pg_num & 31))) { - lite_list[pg_num>>5] &= ~(1 << (pg_num & 31)); - - if (!(upl->flags & UPL_KERNEL_OBJECT)) - m = vm_page_lookup(shadow_object, target_offset + (upl->offset - shadow_object->paging_offset)); - } - } - if (upl->flags & UPL_SHADOWED) { - if ((t = vm_page_lookup(object, target_offset)) != VM_PAGE_NULL) { - - t->pageout = FALSE; - - VM_PAGE_FREE(t); - - if (m == VM_PAGE_NULL) - m = vm_page_lookup(shadow_object, target_offset + object->shadow_offset); - } - } - if ((upl->flags & UPL_KERNEL_OBJECT) || m == VM_PAGE_NULL) - goto commit_next_page; - - if (flags & UPL_COMMIT_CS_VALIDATED) { - /* - * CODE SIGNING: - * Set the code signing bits according to - * what the UPL says they should be. - */ - m->cs_validated = page_list[entry].cs_validated; - m->cs_tainted = page_list[entry].cs_tainted; - } - if (upl->flags & UPL_IO_WIRE) { - - dwp->dw_mask |= DW_vm_page_unwire; - - if (page_list) - page_list[entry].phys_addr = 0; + obj_start = target_offset + upl->u_offset - shadow_object->paging_offset; + obj_end = obj_start + xfer_size; + obj_start = vm_object_trunc_page(obj_start); + obj_end = vm_object_round_page(obj_end); + for (obj_offset = obj_start; + obj_offset < obj_end; + obj_offset += PAGE_SIZE) { + vm_page_t t, m; + unsigned int pg_num; + boolean_t needed; - if (flags & UPL_COMMIT_SET_DIRTY) - m->dirty = TRUE; - else if (flags & UPL_COMMIT_CLEAR_DIRTY) { - m->dirty = FALSE; + pg_num = (unsigned int) (target_offset / PAGE_SIZE); + assert(pg_num == target_offset / PAGE_SIZE); - if (! (flags & UPL_COMMIT_CS_VALIDATED) && - m->cs_validated && !m->cs_tainted) { - /* - * CODE SIGNING: - * This page is no longer dirty - * but could have been modified, - * so it will need to be - * re-validated. - */ - m->cs_validated = FALSE; -#if DEVELOPMENT || DEBUG - vm_cs_validated_resets++; -#endif - pmap_disconnect(m->phys_page); - } - clear_refmod |= VM_MEM_MODIFIED; - } - if (flags & UPL_COMMIT_INACTIVATE) { - dwp->dw_mask |= DW_vm_page_deactivate_internal; - clear_refmod |= VM_MEM_REFERENCED; - } - if (upl->flags & UPL_ACCESS_BLOCKED) { - /* - * We blocked access to the pages in this UPL. - * Clear the "busy" bit and wake up any waiter - * for this page. - */ - dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); - } - goto commit_next_page; - } - /* - * make sure to clear the hardware - * modify or reference bits before - * releasing the BUSY bit on this page - * otherwise we risk losing a legitimate - * change of state - */ - if (flags & UPL_COMMIT_CLEAR_DIRTY) { - m->dirty = FALSE; + needed = FALSE; - if (! (flags & UPL_COMMIT_CS_VALIDATED) && - m->cs_validated && !m->cs_tainted) { - /* - * CODE SIGNING: - * This page is no longer dirty - * but could have been modified, - * so it will need to be - * re-validated. - */ - m->cs_validated = FALSE; -#if DEVELOPMENT || DEBUG - vm_cs_validated_resets++; -#endif - pmap_disconnect(m->phys_page); - } - clear_refmod |= VM_MEM_MODIFIED; + if (user_page_list) { + needed = user_page_list[pg_num].needed; } - if (page_list) { - upl_page_info_t *p; - p = &(page_list[entry]); + dwp->dw_mask = 0; + m = VM_PAGE_NULL; - if (p->phys_addr && p->pageout && !m->pageout) { - m->busy = TRUE; - m->pageout = TRUE; + if (upl->flags & UPL_LITE) { + if (lite_list[pg_num >> 5] & (1U << (pg_num & 31))) { + lite_list[pg_num >> 5] &= ~(1U << (pg_num & 31)); - dwp->dw_mask |= DW_vm_page_wire; + if (!(upl->flags & UPL_KERNEL_OBJECT)) { + m = vm_page_lookup(shadow_object, obj_offset); + } + } + } + if (upl->flags & UPL_SHADOWED) { + if ((t = vm_page_lookup(object, target_offset)) != VM_PAGE_NULL) { + t->vmp_free_when_done = FALSE; - } else if (p->phys_addr && - !p->pageout && m->pageout && - !m->dump_cleaning) { - m->pageout = FALSE; - m->absent = FALSE; - m->overwriting = FALSE; + VM_PAGE_FREE(t); - dwp->dw_mask |= (DW_vm_page_unwire | DW_clear_busy | DW_PAGE_WAKEUP); + if (m == VM_PAGE_NULL) { + m = vm_page_lookup(shadow_object, target_offset + object->vo_shadow_offset); + } } - page_list[entry].phys_addr = 0; } - m->dump_cleaning = FALSE; + if ((upl->flags & UPL_KERNEL_OBJECT)) { + goto abort_next_page; + } - if (m->laundry) - dwp->dw_mask |= DW_vm_pageout_throttle_up; + if (m != VM_PAGE_NULL) { + assert(m->vmp_q_state != VM_PAGE_USED_BY_COMPRESSOR); - if (m->pageout) { - m->cleaning = FALSE; - m->encrypted_cleaning = FALSE; - m->pageout = FALSE; -#if MACH_CLUSTER_STATS - if (m->wanted) vm_pageout_target_collisions++; -#endif - m->dirty = FALSE; + if (m->vmp_absent) { + boolean_t must_free = TRUE; - if (! (flags & UPL_COMMIT_CS_VALIDATED) && - m->cs_validated && !m->cs_tainted) { /* - * CODE SIGNING: - * This page is no longer dirty - * but could have been modified, - * so it will need to be - * re-validated. + * COPYOUT = FALSE case + * check for error conditions which must + * be passed back to the pages customer */ - m->cs_validated = FALSE; -#if DEVELOPMENT || DEBUG - vm_cs_validated_resets++; -#endif - pmap_disconnect(m->phys_page); - } + if (error & UPL_ABORT_RESTART) { + m->vmp_restart = TRUE; + m->vmp_absent = FALSE; + m->vmp_unusual = TRUE; + must_free = FALSE; + } else if (error & UPL_ABORT_UNAVAILABLE) { + m->vmp_restart = FALSE; + m->vmp_unusual = TRUE; + must_free = FALSE; + } else if (error & UPL_ABORT_ERROR) { + m->vmp_restart = FALSE; + m->vmp_absent = FALSE; + m->vmp_error = TRUE; + m->vmp_unusual = TRUE; + must_free = FALSE; + } + if (m->vmp_clustered && needed == FALSE) { + /* + * This page was a part of a speculative + * read-ahead initiated by the kernel + * itself. No one is expecting this + * page and no one will clean up its + * error state if it ever becomes valid + * in the future. + * We have to free it here. + */ + must_free = TRUE; + } + m->vmp_cleaning = FALSE; - if ((flags & UPL_COMMIT_SET_DIRTY) || - (m->pmapped && (pmap_disconnect(m->phys_page) & VM_MEM_MODIFIED))) - m->dirty = TRUE; + if (m->vmp_overwriting && !m->vmp_busy) { + /* + * this shouldn't happen since + * this is an 'absent' page, but + * it doesn't hurt to check for + * the 'alternate' method of + * stabilizing the page... + * we will mark 'busy' to be cleared + * in the following code which will + * take care of the primary stabilzation + * method (i.e. setting 'busy' to TRUE) + */ + dwp->dw_mask |= DW_vm_page_unwire; + } + m->vmp_overwriting = FALSE; - if (m->dirty) { - /* - * page was re-dirtied after we started - * the pageout... reactivate it since - * we don't know whether the on-disk - * copy matches what is now in memory - */ - dwp->dw_mask |= (DW_vm_page_unwire | DW_clear_busy | DW_PAGE_WAKEUP); + dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); - if (upl->flags & UPL_PAGEOUT) { - CLUSTER_STAT(vm_pageout_target_page_dirtied++;) - VM_STAT_INCR(reactivations); - DTRACE_VM2(pgrec, int, 1, (uint64_t *), NULL); + if (must_free == TRUE) { + dwp->dw_mask |= DW_vm_page_free; + } else { + dwp->dw_mask |= DW_vm_page_activate; } } else { /* - * page has been successfully cleaned - * go ahead and free it for other use + * Handle the trusted pager throttle. */ - - if (m->object->internal) { - DTRACE_VM2(anonpgout, int, 1, (uint64_t *), NULL); - } else { - DTRACE_VM2(fspgout, int, 1, (uint64_t *), NULL); + if (m->vmp_laundry) { + dwp->dw_mask |= DW_vm_pageout_throttle_up; } - dwp->dw_mask |= DW_vm_page_free; - - if (upl->flags & UPL_PAGEOUT) { - CLUSTER_STAT(vm_pageout_target_page_freed++;) - if (page_list[entry].dirty) { - VM_STAT_INCR(pageouts); - DTRACE_VM2(pgout, int, 1, (uint64_t *), NULL); - pgpgout_count++; + if (upl->flags & UPL_ACCESS_BLOCKED) { + /* + * We blocked access to the pages in this UPL. + * Clear the "busy" bit and wake up any waiter + * for this page. + */ + dwp->dw_mask |= DW_clear_busy; + } + if (m->vmp_overwriting) { + if (m->vmp_busy) { + dwp->dw_mask |= DW_clear_busy; + } else { + /* + * deal with the 'alternate' method + * of stabilizing the page... + * we will either free the page + * or mark 'busy' to be cleared + * in the following code which will + * take care of the primary stabilzation + * method (i.e. setting 'busy' to TRUE) + */ + dwp->dw_mask |= DW_vm_page_unwire; } + m->vmp_overwriting = FALSE; } - } - goto commit_next_page; - } -#if MACH_CLUSTER_STATS - if (m->wpmapped) - m->dirty = pmap_is_modified(m->phys_page); - - if (m->dirty) vm_pageout_cluster_dirtied++; - else vm_pageout_cluster_cleaned++; - if (m->wanted) vm_pageout_cluster_collisions++; -#endif - m->dirty = FALSE; - - if (! (flags & UPL_COMMIT_CS_VALIDATED) && - m->cs_validated && !m->cs_tainted) { - /* - * CODE SIGNING: - * This page is no longer dirty - * but could have been modified, - * so it will need to be - * re-validated. - */ - m->cs_validated = FALSE; -#if DEVELOPMENT || DEBUG - vm_cs_validated_resets++; -#endif - pmap_disconnect(m->phys_page); - } - - if ((m->busy) && (m->cleaning)) { - /* - * the request_page_list case - */ - m->absent = FALSE; - m->overwriting = FALSE; - - dwp->dw_mask |= DW_clear_busy; - - } else if (m->overwriting) { - /* - * alternate request page list, write to - * page_list case. Occurs when the original - * page was wired at the time of the list - * request - */ - assert(VM_PAGE_WIRED(m)); - m->overwriting = FALSE; - - dwp->dw_mask |= DW_vm_page_unwire; /* reactivates */ - } - m->cleaning = FALSE; - m->encrypted_cleaning = FALSE; - - /* - * It is a part of the semantic of COPYOUT_FROM - * UPLs that a commit implies cache sync - * between the vm page and the backing store - * this can be used to strip the precious bit - * as well as clean - */ - if ((upl->flags & UPL_PAGE_SYNC_DONE) || (flags & UPL_COMMIT_CLEAR_PRECIOUS)) - m->precious = FALSE; - - if (flags & UPL_COMMIT_SET_DIRTY) - m->dirty = TRUE; - - if ((flags & UPL_COMMIT_INACTIVATE) && !m->clustered && !m->speculative) { - dwp->dw_mask |= DW_vm_page_deactivate_internal; - clear_refmod |= VM_MEM_REFERENCED; + m->vmp_free_when_done = FALSE; + m->vmp_cleaning = FALSE; - } else if (!m->active && !m->inactive && !m->speculative) { + if (error & UPL_ABORT_DUMP_PAGES) { + pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m)); - if (m->clustered || (flags & UPL_COMMIT_SPECULATE)) - dwp->dw_mask |= DW_vm_page_speculate; - else if (m->reference) - dwp->dw_mask |= DW_vm_page_activate; - else { - dwp->dw_mask |= DW_vm_page_deactivate_internal; - clear_refmod |= VM_MEM_REFERENCED; + dwp->dw_mask |= DW_vm_page_free; + } else { + if (!(dwp->dw_mask & DW_vm_page_unwire)) { + if (error & UPL_ABORT_REFERENCE) { + /* + * we've been told to explictly + * reference this page... for + * file I/O, this is done by + * implementing an LRU on the inactive q + */ + dwp->dw_mask |= DW_vm_page_lru; + } else if (!VM_PAGE_PAGEABLE(m)) { + dwp->dw_mask |= DW_vm_page_deactivate_internal; + } + } + dwp->dw_mask |= DW_PAGE_WAKEUP; + } } } - if (upl->flags & UPL_ACCESS_BLOCKED) { - /* - * We blocked access to the pages in this URL. - * Clear the "busy" bit on this page before we - * wake up any waiter. - */ - dwp->dw_mask |= DW_clear_busy; - } - /* - * Wakeup any thread waiting for the page to be un-cleaning. - */ - dwp->dw_mask |= DW_PAGE_WAKEUP; - -commit_next_page: - if (clear_refmod) - pmap_clear_refmod(m->phys_page, clear_refmod); - +abort_next_page: target_offset += PAGE_SIZE_64; xfer_size -= PAGE_SIZE; entry++; if (dwp->dw_mask) { if (dwp->dw_mask & ~(DW_clear_busy | DW_PAGE_WAKEUP)) { - if (m->busy == FALSE) { - /* - * dw_do_work may need to drop the object lock - * if it does, we need the pages it's looking at to - * be held stable via the busy bit. - */ - m->busy = TRUE; - dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); - } - dwp->dw_m = m; - dwp++; - dw_count++; - - if (dw_count >= DELAYED_WORK_LIMIT) { - dw_do_work(shadow_object, &dw_array[0], dw_count); - - dwp = &dw_array[0]; + VM_PAGE_ADD_DELAYED_WORK(dwp, m, dw_count); + + if (dw_count >= dw_limit) { + vm_page_do_delayed_work(shadow_object, VM_KERN_MEMORY_NONE, dwp_start, dw_count); + + dwp = dwp_start; dw_count = 0; } } else { - if (dwp->dw_mask & DW_clear_busy) - m->busy = FALSE; + if (dwp->dw_mask & DW_clear_busy) { + m->vmp_busy = FALSE; + } - if (dwp->dw_mask & DW_PAGE_WAKEUP) + if (dwp->dw_mask & DW_PAGE_WAKEUP) { PAGE_WAKEUP(m); + } } } } - if (dw_count) - dw_do_work(shadow_object, &dw_array[0], dw_count); + if (dw_count) { + vm_page_do_delayed_work(shadow_object, VM_KERN_MEMORY_NONE, dwp_start, dw_count); + dwp = dwp_start; + dw_count = 0; + } occupied = 1; - if (upl->flags & UPL_DEVICE_MEMORY) { + if (upl->flags & UPL_DEVICE_MEMORY) { occupied = 0; } else if (upl->flags & UPL_LITE) { - int pg_num; - int i; + int pg_num; + int i; - pg_num = upl->size/PAGE_SIZE; + pg_num = upl_adjusted_size(upl, PAGE_MASK) / PAGE_SIZE; pg_num = (pg_num + 31) >> 5; occupied = 0; @@ -4981,8 +8389,9 @@ commit_next_page: } } } else { - if (queue_empty(&upl->map_object->memq)) + if (vm_page_queue_empty(&upl->map_object->memq)) { occupied = 0; + } } if (occupied == 0) { /* @@ -4990,460 +8399,527 @@ commit_next_page: * empty, then this is the right function to deallocate * it. So go ahead set the *empty variable. The flag * UPL_COMMIT_NOTIFY_EMPTY, from the caller's point of view - * should be considered relevant for the Vector UPL and not - * the internal UPLs. + * should be considered relevant for the Vector UPL and + * not the internal UPLs. */ - if ((upl->flags & UPL_COMMIT_NOTIFY_EMPTY) || isVectorUPL) + if ((upl->flags & UPL_COMMIT_NOTIFY_EMPTY) || isVectorUPL) { *empty = TRUE; + } if (object == shadow_object && !(upl->flags & UPL_KERNEL_OBJECT)) { - /* + /* * this is not a paging object * so we need to drop the paging reference * that was taken when we created the UPL * against this object */ vm_object_activity_end(shadow_object); + vm_object_collapse(shadow_object, 0, TRUE); } else { - /* - * we dontated the paging reference to - * the map object... vm_pageout_object_terminate - * will drop this reference - */ + /* + * we dontated the paging reference to + * the map object... vm_pageout_object_terminate + * will drop this reference + */ } } vm_object_unlock(shadow_object); - if (object != shadow_object) - vm_object_unlock(object); - - if(!isVectorUPL) + if (object != shadow_object) { + vm_object_unlock(object); + } + + if (!isVectorUPL) { upl_unlock(upl); - else { - /* + } else { + /* * If we completed our operations on an UPL that is * part of a Vectored UPL and if empty is TRUE, then - * we should go ahead and deallocate this UPL element. + * we should go ahead and deallocate this UPL element. * Then we check if this was the last of the UPL elements * within that Vectored UPL. If so, set empty to TRUE - * so that in ubc_upl_commit_range or ubc_upl_commit, we + * so that in ubc_upl_abort_range or ubc_upl_abort, we * can go ahead and deallocate the Vector UPL too. */ - if(*empty==TRUE) { + if (*empty == TRUE) { *empty = vector_upl_set_subupl(vector_upl, upl, 0); upl_deallocate(upl); } - goto process_upl_to_commit; + goto process_upl_to_abort; } - if (pgpgout_count) { - DTRACE_VM2(pgpgout, int, pgpgout_count, (uint64_t *), NULL); + kr = KERN_SUCCESS; + +done: + if (dwp_start && dwp_finish_ctx) { + vm_page_delayed_work_finish_ctx(dwp_start); + dwp_start = dwp = NULL; } - return KERN_SUCCESS; + return kr; } + kern_return_t -upl_abort_range( - upl_t upl, - upl_offset_t offset, - upl_size_t size, - int error, - boolean_t *empty) +upl_abort( + upl_t upl, + int error) { - upl_size_t xfer_size, subupl_size = size; - vm_object_t shadow_object; - vm_object_t object; - vm_object_offset_t target_offset; - upl_offset_t subupl_offset = offset; - int entry; - wpl_array_t lite_list; - int occupied; - struct dw dw_array[DELAYED_WORK_LIMIT]; - struct dw *dwp; - int dw_count, isVectorUPL = 0; - upl_t vector_upl = NULL; + boolean_t empty; + + if (upl == UPL_NULL) { + return KERN_INVALID_ARGUMENT; + } + + return upl_abort_range(upl, 0, upl->u_size, error, &empty); +} - *empty = FALSE; - if (upl == UPL_NULL) +/* an option on commit should be wire */ +kern_return_t +upl_commit( + upl_t upl, + upl_page_info_t *page_list, + mach_msg_type_number_t count) +{ + boolean_t empty; + + if (upl == UPL_NULL) { return KERN_INVALID_ARGUMENT; + } - if ( (upl->flags & UPL_IO_WIRE) && !(error & UPL_ABORT_DUMP_PAGES) ) - return upl_commit_range(upl, offset, size, 0, NULL, 0, empty); + return upl_commit_range(upl, 0, upl->u_size, 0, + page_list, count, &empty); +} - if((isVectorUPL = vector_upl_is_valid(upl))) { - vector_upl = upl; - upl_lock(vector_upl); + +void +iopl_valid_data( + upl_t upl, + vm_tag_t tag) +{ + vm_object_t object; + vm_offset_t offset; + vm_page_t m, nxt_page = VM_PAGE_NULL; + upl_size_t size; + int wired_count = 0; + + if (upl == NULL) { + panic("iopl_valid_data: NULL upl"); + } + if (vector_upl_is_valid(upl)) { + panic("iopl_valid_data: vector upl"); + } + if ((upl->flags & (UPL_DEVICE_MEMORY | UPL_SHADOWED | UPL_ACCESS_BLOCKED | UPL_IO_WIRE | UPL_INTERNAL)) != UPL_IO_WIRE) { + panic("iopl_valid_data: unsupported upl, flags = %x", upl->flags); } - else - upl_lock(upl); -process_upl_to_abort: - if(isVectorUPL) { - size = subupl_size; - offset = subupl_offset; - if(size == 0) { - upl_unlock(vector_upl); - return KERN_SUCCESS; - } - upl = vector_upl_subupl_byoffset(vector_upl, &offset, &size); - if(upl == NULL) { - upl_unlock(vector_upl); - return KERN_FAILURE; - } - subupl_size -= size; - subupl_offset += size; + object = upl->map_object; + + if (object == kernel_object || object == compressor_object) { + panic("iopl_valid_data: object == kernel or compressor"); } - *empty = FALSE; + if (object->purgable == VM_PURGABLE_VOLATILE || + object->purgable == VM_PURGABLE_EMPTY) { + panic("iopl_valid_data: object %p purgable %d", + object, object->purgable); + } -#if UPL_DEBUG - if (upl->upl_commit_index < UPL_DEBUG_COMMIT_RECORDS) { - (void) OSBacktrace(&upl->upl_commit_records[upl->upl_commit_index].c_retaddr[0], UPL_DEBUG_STACK_FRAMES); - - upl->upl_commit_records[upl->upl_commit_index].c_beg = offset; - upl->upl_commit_records[upl->upl_commit_index].c_end = (offset + size); - upl->upl_commit_records[upl->upl_commit_index].c_aborted = 1; + size = upl_adjusted_size(upl, PAGE_MASK); - upl->upl_commit_index++; + vm_object_lock(object); + VM_OBJECT_WIRED_PAGE_UPDATE_START(object); + + if (object->vo_size == size && object->resident_page_count == (size / PAGE_SIZE)) { + nxt_page = (vm_page_t)vm_page_queue_first(&object->memq); + } else { + offset = (vm_offset_t)(upl_adjusted_offset(upl, PAGE_MASK) - object->paging_offset); } -#endif - if (upl->flags & UPL_DEVICE_MEMORY) - xfer_size = 0; - else if ((offset + size) <= upl->size) - xfer_size = size; - else { - if(!isVectorUPL) - upl_unlock(upl); - else { - upl_unlock(vector_upl); + + while (size) { + if (nxt_page != VM_PAGE_NULL) { + m = nxt_page; + nxt_page = (vm_page_t)vm_page_queue_next(&nxt_page->vmp_listq); + } else { + m = vm_page_lookup(object, offset); + offset += PAGE_SIZE; + + if (m == VM_PAGE_NULL) { + panic("iopl_valid_data: missing expected page at offset %lx", (long)offset); + } } + if (m->vmp_busy) { + if (!m->vmp_absent) { + panic("iopl_valid_data: busy page w/o absent"); + } - return KERN_FAILURE; - } - if (upl->flags & UPL_INTERNAL) { - lite_list = (wpl_array_t) - ((((uintptr_t)upl) + sizeof(struct upl)) - + ((upl->size/PAGE_SIZE) * sizeof(upl_page_info_t))); - } else { - lite_list = (wpl_array_t) - (((uintptr_t)upl) + sizeof(struct upl)); + if (m->vmp_pageq.next || m->vmp_pageq.prev) { + panic("iopl_valid_data: busy+absent page on page queue"); + } + if (m->vmp_reusable) { + panic("iopl_valid_data: %p is reusable", m); + } + + m->vmp_absent = FALSE; + m->vmp_dirty = TRUE; + assert(m->vmp_q_state == VM_PAGE_NOT_ON_Q); + assert(m->vmp_wire_count == 0); + m->vmp_wire_count++; + assert(m->vmp_wire_count); + if (m->vmp_wire_count == 1) { + m->vmp_q_state = VM_PAGE_IS_WIRED; + wired_count++; + } else { + panic("iopl_valid_data: %p already wired\n", m); + } + + PAGE_WAKEUP_DONE(m); + } + size -= PAGE_SIZE; } - object = upl->map_object; + if (wired_count) { + VM_OBJECT_WIRED_PAGE_COUNT(object, wired_count); + assert(object->resident_page_count >= object->wired_page_count); - if (upl->flags & UPL_SHADOWED) { - vm_object_lock(object); - shadow_object = object->shadow; - } else - shadow_object = object; + /* no need to adjust purgeable accounting for this object: */ + assert(object->purgable != VM_PURGABLE_VOLATILE); + assert(object->purgable != VM_PURGABLE_EMPTY); - entry = offset/PAGE_SIZE; - target_offset = (vm_object_offset_t)offset; + vm_page_lockspin_queues(); + vm_page_wire_count += wired_count; + vm_page_unlock_queues(); + } + VM_OBJECT_WIRED_PAGE_UPDATE_END(object, tag); + vm_object_unlock(object); +} - if (upl->flags & UPL_KERNEL_OBJECT) - vm_object_lock_shared(shadow_object); - else - vm_object_lock(shadow_object); - if (upl->flags & UPL_ACCESS_BLOCKED) { - assert(shadow_object->blocked_access); - shadow_object->blocked_access = FALSE; - vm_object_wakeup(object, VM_OBJECT_EVENT_UNBLOCKED); +void +vm_object_set_pmap_cache_attr( + vm_object_t object, + upl_page_info_array_t user_page_list, + unsigned int num_pages, + boolean_t batch_pmap_op) +{ + unsigned int cache_attr = 0; + + cache_attr = object->wimg_bits & VM_WIMG_MASK; + assert(user_page_list); + if (cache_attr != VM_WIMG_USE_DEFAULT) { + PMAP_BATCH_SET_CACHE_ATTR(object, user_page_list, cache_attr, num_pages, batch_pmap_op); } +} - dwp = &dw_array[0]; - dw_count = 0; - if ((error & UPL_ABORT_DUMP_PAGES) && (upl->flags & UPL_KERNEL_OBJECT)) - panic("upl_abort_range: kernel_object being DUMPED"); +boolean_t vm_object_iopl_wire_full(vm_object_t, upl_t, upl_page_info_array_t, wpl_array_t, upl_control_flags_t, vm_tag_t); +kern_return_t vm_object_iopl_wire_empty(vm_object_t, upl_t, upl_page_info_array_t, wpl_array_t, upl_control_flags_t, vm_tag_t, vm_object_offset_t *, int, int*); - while (xfer_size) { - vm_page_t t, m; - dwp->dw_mask = 0; - m = VM_PAGE_NULL; +boolean_t +vm_object_iopl_wire_full(vm_object_t object, upl_t upl, upl_page_info_array_t user_page_list, + wpl_array_t lite_list, upl_control_flags_t cntrl_flags, vm_tag_t tag) +{ + vm_page_t dst_page; + unsigned int entry; + int page_count; + int delayed_unlock = 0; + boolean_t retval = TRUE; + ppnum_t phys_page; + + vm_object_lock_assert_exclusive(object); + assert(object->purgable != VM_PURGABLE_VOLATILE); + assert(object->purgable != VM_PURGABLE_EMPTY); + assert(object->pager == NULL); + assert(object->copy == NULL); + assert(object->shadow == NULL); + + page_count = object->resident_page_count; + dst_page = (vm_page_t)vm_page_queue_first(&object->memq); - if (upl->flags & UPL_LITE) { - unsigned int pg_num; + vm_page_lock_queues(); - pg_num = (unsigned int) (target_offset/PAGE_SIZE); - assert(pg_num == target_offset/PAGE_SIZE); - + while (page_count--) { + if (dst_page->vmp_busy || + dst_page->vmp_fictitious || + dst_page->vmp_absent || + dst_page->vmp_error || + dst_page->vmp_cleaning || + dst_page->vmp_restart || + dst_page->vmp_laundry) { + retval = FALSE; + goto done; + } + if ((cntrl_flags & UPL_REQUEST_FORCE_COHERENCY) && dst_page->vmp_written_by_kernel == TRUE) { + retval = FALSE; + goto done; + } + dst_page->vmp_reference = TRUE; - if (lite_list[pg_num>>5] & (1 << (pg_num & 31))) { - lite_list[pg_num>>5] &= ~(1 << (pg_num & 31)); + vm_page_wire(dst_page, tag, FALSE); - if ( !(upl->flags & UPL_KERNEL_OBJECT)) - m = vm_page_lookup(shadow_object, target_offset + - (upl->offset - shadow_object->paging_offset)); - } + if (!(cntrl_flags & UPL_COPYOUT_FROM)) { + SET_PAGE_DIRTY(dst_page, FALSE); } - if (upl->flags & UPL_SHADOWED) { - if ((t = vm_page_lookup(object, target_offset)) != VM_PAGE_NULL) { - t->pageout = FALSE; + entry = (unsigned int)(dst_page->vmp_offset / PAGE_SIZE); + assert(entry >= 0 && entry < object->resident_page_count); + lite_list[entry >> 5] |= 1U << (entry & 31); - VM_PAGE_FREE(t); + phys_page = VM_PAGE_GET_PHYS_PAGE(dst_page); - if (m == VM_PAGE_NULL) - m = vm_page_lookup(shadow_object, target_offset + object->shadow_offset); - } + if (phys_page > upl->highest_page) { + upl->highest_page = phys_page; } - if ((upl->flags & UPL_KERNEL_OBJECT)) - goto abort_next_page; - if (m != VM_PAGE_NULL) { + if (user_page_list) { + user_page_list[entry].phys_addr = phys_page; + user_page_list[entry].absent = dst_page->vmp_absent; + user_page_list[entry].dirty = dst_page->vmp_dirty; + user_page_list[entry].free_when_done = dst_page->vmp_free_when_done; + user_page_list[entry].precious = dst_page->vmp_precious; + user_page_list[entry].device = FALSE; + user_page_list[entry].speculative = FALSE; + user_page_list[entry].cs_validated = FALSE; + user_page_list[entry].cs_tainted = FALSE; + user_page_list[entry].cs_nx = FALSE; + user_page_list[entry].needed = FALSE; + user_page_list[entry].mark = FALSE; + } + if (delayed_unlock++ > 256) { + delayed_unlock = 0; + lck_mtx_yield(&vm_page_queue_lock); + + VM_CHECK_MEMORYSTATUS; + } + dst_page = (vm_page_t)vm_page_queue_next(&dst_page->vmp_listq); + } +done: + vm_page_unlock_queues(); - if (m->absent) { - boolean_t must_free = TRUE; + VM_CHECK_MEMORYSTATUS; - m->clustered = FALSE; - /* - * COPYOUT = FALSE case - * check for error conditions which must - * be passed back to the pages customer - */ - if (error & UPL_ABORT_RESTART) { - m->restart = TRUE; - m->absent = FALSE; - m->unusual = TRUE; - must_free = FALSE; - } else if (error & UPL_ABORT_UNAVAILABLE) { - m->restart = FALSE; - m->unusual = TRUE; - must_free = FALSE; - } else if (error & UPL_ABORT_ERROR) { - m->restart = FALSE; - m->absent = FALSE; - m->error = TRUE; - m->unusual = TRUE; - must_free = FALSE; - } + return retval; +} - /* - * ENCRYPTED SWAP: - * If the page was already encrypted, - * we don't really need to decrypt it - * now. It will get decrypted later, - * on demand, as soon as someone needs - * to access its contents. - */ - m->cleaning = FALSE; - m->encrypted_cleaning = FALSE; - m->overwriting = FALSE; +kern_return_t +vm_object_iopl_wire_empty(vm_object_t object, upl_t upl, upl_page_info_array_t user_page_list, + wpl_array_t lite_list, upl_control_flags_t cntrl_flags, vm_tag_t tag, vm_object_offset_t *dst_offset, + int page_count, int* page_grab_count) +{ + vm_page_t dst_page; + boolean_t no_zero_fill = FALSE; + int interruptible; + int pages_wired = 0; + int pages_inserted = 0; + int entry = 0; + uint64_t delayed_ledger_update = 0; + kern_return_t ret = KERN_SUCCESS; + int grab_options; + ppnum_t phys_page; + + vm_object_lock_assert_exclusive(object); + assert(object->purgable != VM_PURGABLE_VOLATILE); + assert(object->purgable != VM_PURGABLE_EMPTY); + assert(object->pager == NULL); + assert(object->copy == NULL); + assert(object->shadow == NULL); + + if (cntrl_flags & UPL_SET_INTERRUPTIBLE) { + interruptible = THREAD_ABORTSAFE; + } else { + interruptible = THREAD_UNINT; + } + + if (cntrl_flags & (UPL_NOZEROFILL | UPL_NOZEROFILLIO)) { + no_zero_fill = TRUE; + } - dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); + grab_options = 0; +#if CONFIG_SECLUDED_MEMORY + if (object->can_grab_secluded) { + grab_options |= VM_PAGE_GRAB_SECLUDED; + } +#endif /* CONFIG_SECLUDED_MEMORY */ - if (must_free == TRUE) - dwp->dw_mask |= DW_vm_page_free; - else - dwp->dw_mask |= DW_vm_page_activate; - } else { - /* - * Handle the trusted pager throttle. - */ - if (m->laundry) - dwp->dw_mask |= DW_vm_pageout_throttle_up; + while (page_count--) { + while ((dst_page = vm_page_grab_options(grab_options)) + == VM_PAGE_NULL) { + OSAddAtomic(page_count, &vm_upl_wait_for_pages); - if (m->pageout) { - assert(m->busy); - assert(m->wire_count == 1); - m->pageout = FALSE; + VM_DEBUG_EVENT(vm_iopl_page_wait, VM_IOPL_PAGE_WAIT, DBG_FUNC_START, vm_upl_wait_for_pages, 0, 0, 0); - dwp->dw_mask |= DW_vm_page_unwire; - } - m->dump_cleaning = FALSE; - m->cleaning = FALSE; - m->encrypted_cleaning = FALSE; - m->overwriting = FALSE; -#if MACH_PAGEMAP - vm_external_state_clr(m->object->existence_map, m->offset); -#endif /* MACH_PAGEMAP */ - if (error & UPL_ABORT_DUMP_PAGES) { - pmap_disconnect(m->phys_page); + if (vm_page_wait(interruptible) == FALSE) { + /* + * interrupted case + */ + OSAddAtomic(-page_count, &vm_upl_wait_for_pages); - dwp->dw_mask |= DW_vm_page_free; - } else { - if (error & UPL_ABORT_REFERENCE) { - /* - * we've been told to explictly - * reference this page... for - * file I/O, this is done by - * implementing an LRU on the inactive q - */ - dwp->dw_mask |= DW_vm_page_lru; - } - dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); - } + VM_DEBUG_EVENT(vm_iopl_page_wait, VM_IOPL_PAGE_WAIT, DBG_FUNC_END, vm_upl_wait_for_pages, 0, 0, -1); + + ret = MACH_SEND_INTERRUPTED; + goto done; } + OSAddAtomic(-page_count, &vm_upl_wait_for_pages); + + VM_DEBUG_EVENT(vm_iopl_page_wait, VM_IOPL_PAGE_WAIT, DBG_FUNC_END, vm_upl_wait_for_pages, 0, 0, 0); + } + if (no_zero_fill == FALSE) { + vm_page_zero_fill(dst_page); + } else { + dst_page->vmp_absent = TRUE; } -abort_next_page: - target_offset += PAGE_SIZE_64; - xfer_size -= PAGE_SIZE; - entry++; - if (dwp->dw_mask) { - if (dwp->dw_mask & ~(DW_clear_busy | DW_PAGE_WAKEUP)) { - if (m->busy == FALSE) { - /* - * dw_do_work may need to drop the object lock - * if it does, we need the pages it's looking at to - * be held stable via the busy bit. - */ - m->busy = TRUE; - dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); - } - dwp->dw_m = m; - dwp++; - dw_count++; - - if (dw_count >= DELAYED_WORK_LIMIT) { - dw_do_work(shadow_object, &dw_array[0], dw_count); - - dwp = &dw_array[0]; - dw_count = 0; - } - } else { - if (dwp->dw_mask & DW_clear_busy) - m->busy = FALSE; + dst_page->vmp_reference = TRUE; - if (dwp->dw_mask & DW_PAGE_WAKEUP) - PAGE_WAKEUP(m); - } + if (!(cntrl_flags & UPL_COPYOUT_FROM)) { + SET_PAGE_DIRTY(dst_page, FALSE); } - } - if (dw_count) - dw_do_work(shadow_object, &dw_array[0], dw_count); + if (dst_page->vmp_absent == FALSE) { + assert(dst_page->vmp_q_state == VM_PAGE_NOT_ON_Q); + assert(dst_page->vmp_wire_count == 0); + dst_page->vmp_wire_count++; + dst_page->vmp_q_state = VM_PAGE_IS_WIRED; + assert(dst_page->vmp_wire_count); + pages_wired++; + PAGE_WAKEUP_DONE(dst_page); + } + pages_inserted++; - occupied = 1; + vm_page_insert_internal(dst_page, object, *dst_offset, tag, FALSE, TRUE, TRUE, TRUE, &delayed_ledger_update); - if (upl->flags & UPL_DEVICE_MEMORY) { - occupied = 0; - } else if (upl->flags & UPL_LITE) { - int pg_num; - int i; + lite_list[entry >> 5] |= 1U << (entry & 31); - pg_num = upl->size/PAGE_SIZE; - pg_num = (pg_num + 31) >> 5; - occupied = 0; + phys_page = VM_PAGE_GET_PHYS_PAGE(dst_page); - for (i = 0; i < pg_num; i++) { - if (lite_list[i] != 0) { - occupied = 1; - break; - } + if (phys_page > upl->highest_page) { + upl->highest_page = phys_page; } - } else { - if (queue_empty(&upl->map_object->memq)) - occupied = 0; - } - if (occupied == 0) { - /* - * If this UPL element belongs to a Vector UPL and is - * empty, then this is the right function to deallocate - * it. So go ahead set the *empty variable. The flag - * UPL_COMMIT_NOTIFY_EMPTY, from the caller's point of view - * should be considered relevant for the Vector UPL and - * not the internal UPLs. - */ - if ((upl->flags & UPL_COMMIT_NOTIFY_EMPTY) || isVectorUPL) - *empty = TRUE; - if (object == shadow_object && !(upl->flags & UPL_KERNEL_OBJECT)) { - /* - * this is not a paging object - * so we need to drop the paging reference - * that was taken when we created the UPL - * against this object - */ - vm_object_activity_end(shadow_object); + if (user_page_list) { + user_page_list[entry].phys_addr = phys_page; + user_page_list[entry].absent = dst_page->vmp_absent; + user_page_list[entry].dirty = dst_page->vmp_dirty; + user_page_list[entry].free_when_done = FALSE; + user_page_list[entry].precious = FALSE; + user_page_list[entry].device = FALSE; + user_page_list[entry].speculative = FALSE; + user_page_list[entry].cs_validated = FALSE; + user_page_list[entry].cs_tainted = FALSE; + user_page_list[entry].cs_nx = FALSE; + user_page_list[entry].needed = FALSE; + user_page_list[entry].mark = FALSE; + } + entry++; + *dst_offset += PAGE_SIZE_64; + } +done: + if (pages_wired) { + vm_page_lockspin_queues(); + vm_page_wire_count += pages_wired; + vm_page_unlock_queues(); + } + if (pages_inserted) { + if (object->internal) { + OSAddAtomic(pages_inserted, &vm_page_internal_count); } else { - /* - * we dontated the paging reference to - * the map object... vm_pageout_object_terminate - * will drop this reference - */ + OSAddAtomic(pages_inserted, &vm_page_external_count); } } - vm_object_unlock(shadow_object); - if (object != shadow_object) - vm_object_unlock(object); - - if(!isVectorUPL) - upl_unlock(upl); - else { - /* - * If we completed our operations on an UPL that is - * part of a Vectored UPL and if empty is TRUE, then - * we should go ahead and deallocate this UPL element. - * Then we check if this was the last of the UPL elements - * within that Vectored UPL. If so, set empty to TRUE - * so that in ubc_upl_abort_range or ubc_upl_abort, we - * can go ahead and deallocate the Vector UPL too. - */ - if(*empty == TRUE) { - *empty = vector_upl_set_subupl(vector_upl, upl,0); - upl_deallocate(upl); + if (delayed_ledger_update) { + task_t owner; + int ledger_idx_volatile; + int ledger_idx_nonvolatile; + int ledger_idx_volatile_compressed; + int ledger_idx_nonvolatile_compressed; + boolean_t do_footprint; + + owner = VM_OBJECT_OWNER(object); + assert(owner); + + vm_object_ledger_tag_ledgers(object, + &ledger_idx_volatile, + &ledger_idx_nonvolatile, + &ledger_idx_volatile_compressed, + &ledger_idx_nonvolatile_compressed, + &do_footprint); + + /* more non-volatile bytes */ + ledger_credit(owner->ledger, + ledger_idx_nonvolatile, + delayed_ledger_update); + if (do_footprint) { + /* more footprint */ + ledger_credit(owner->ledger, + task_ledgers.phys_footprint, + delayed_ledger_update); } - goto process_upl_to_abort; } - return KERN_SUCCESS; -} - - -kern_return_t -upl_abort( - upl_t upl, - int error) -{ - boolean_t empty; + assert(page_grab_count); + *page_grab_count = pages_inserted; - return upl_abort_range(upl, 0, upl->size, error, &empty); + return ret; } -/* an option on commit should be wire */ + kern_return_t -upl_commit( - upl_t upl, - upl_page_info_t *page_list, - mach_msg_type_number_t count) +vm_object_iopl_request( + vm_object_t object, + vm_object_offset_t offset, + upl_size_t size, + upl_t *upl_ptr, + upl_page_info_array_t user_page_list, + unsigned int *page_list_count, + upl_control_flags_t cntrl_flags, + vm_tag_t tag) { - boolean_t empty; + vm_page_t dst_page; + vm_object_offset_t dst_offset; + upl_size_t xfer_size; + upl_t upl = NULL; + unsigned int entry; + wpl_array_t lite_list = NULL; + int no_zero_fill = FALSE; + unsigned int size_in_pages; + int page_grab_count = 0; + u_int32_t psize; + kern_return_t ret; + vm_prot_t prot; + struct vm_object_fault_info fault_info = {}; + struct vm_page_delayed_work dw_array; + struct vm_page_delayed_work *dwp, *dwp_start; + bool dwp_finish_ctx = TRUE; + int dw_count; + int dw_limit; + int dw_index; + boolean_t caller_lookup; + int io_tracking_flag = 0; + int interruptible; + ppnum_t phys_page; + + boolean_t set_cache_attr_needed = FALSE; + boolean_t free_wired_pages = FALSE; + boolean_t fast_path_empty_req = FALSE; + boolean_t fast_path_full_req = FALSE; - return upl_commit_range(upl, 0, upl->size, 0, page_list, count, &empty); -} +#if DEVELOPMENT || DEBUG + task_t task = current_task(); +#endif /* DEVELOPMENT || DEBUG */ + dwp_start = dwp = NULL; -unsigned int vm_object_iopl_request_sleep_for_cleaning = 0; + vm_object_offset_t original_offset = offset; + upl_size_t original_size = size; -kern_return_t -vm_object_iopl_request( - vm_object_t object, - vm_object_offset_t offset, - upl_size_t size, - upl_t *upl_ptr, - upl_page_info_array_t user_page_list, - unsigned int *page_list_count, - int cntrl_flags) -{ - vm_page_t dst_page; - vm_object_offset_t dst_offset; - upl_size_t xfer_size; - upl_t upl = NULL; - unsigned int entry; - wpl_array_t lite_list = NULL; - int no_zero_fill = FALSE; - u_int32_t psize; - kern_return_t ret; - vm_prot_t prot; - struct vm_object_fault_info fault_info; - struct dw dw_array[DELAYED_WORK_LIMIT]; - struct dw *dwp; - int dw_count; - int dw_index; +// DEBUG4K_UPL("object %p offset 0x%llx size 0x%llx cntrl_flags 0x%llx\n", object, (uint64_t)offset, (uint64_t)size, cntrl_flags); + + size = (upl_size_t)(vm_object_round_page(offset + size) - vm_object_trunc_page(offset)); + offset = vm_object_trunc_page(offset); + if (size != original_size || offset != original_offset) { + DEBUG4K_IOKIT("flags 0x%llx object %p offset 0x%llx size 0x%x -> offset 0x%llx size 0x%x\n", cntrl_flags, object, original_offset, original_size, offset, size); + } if (cntrl_flags & ~UPL_VALID_FLAGS) { /* @@ -5452,83 +8928,110 @@ vm_object_iopl_request( */ return KERN_INVALID_VALUE; } - if (vm_lopage_poolsize == 0) - cntrl_flags &= ~UPL_NEED_32BIT_ADDR; + if (vm_lopage_needed == FALSE) { + cntrl_flags &= ~UPL_NEED_32BIT_ADDR; + } if (cntrl_flags & UPL_NEED_32BIT_ADDR) { - if ( (cntrl_flags & (UPL_SET_IO_WIRE | UPL_SET_LITE)) != (UPL_SET_IO_WIRE | UPL_SET_LITE)) - return KERN_INVALID_VALUE; + if ((cntrl_flags & (UPL_SET_IO_WIRE | UPL_SET_LITE)) != (UPL_SET_IO_WIRE | UPL_SET_LITE)) { + return KERN_INVALID_VALUE; + } if (object->phys_contiguous) { - if ((offset + object->shadow_offset) >= (vm_object_offset_t)max_valid_dma_address) - return KERN_INVALID_ADDRESS; - - if (((offset + object->shadow_offset) + size) >= (vm_object_offset_t)max_valid_dma_address) - return KERN_INVALID_ADDRESS; + if ((offset + object->vo_shadow_offset) >= (vm_object_offset_t)max_valid_dma_address) { + return KERN_INVALID_ADDRESS; + } + + if (((offset + object->vo_shadow_offset) + size) >= (vm_object_offset_t)max_valid_dma_address) { + return KERN_INVALID_ADDRESS; + } } } - - if (cntrl_flags & UPL_ENCRYPT) { - /* - * ENCRYPTED SWAP: - * The paging path doesn't use this interface, - * so we don't support the UPL_ENCRYPT flag - * here. We won't encrypt the pages. - */ - assert(! (cntrl_flags & UPL_ENCRYPT)); + if (cntrl_flags & (UPL_NOZEROFILL | UPL_NOZEROFILLIO)) { + no_zero_fill = TRUE; } - if (cntrl_flags & UPL_NOZEROFILL) - no_zero_fill = TRUE; - if (cntrl_flags & UPL_COPYOUT_FROM) + if (cntrl_flags & UPL_COPYOUT_FROM) { prot = VM_PROT_READ; - else + } else { prot = VM_PROT_READ | VM_PROT_WRITE; + } + + if ((!object->internal) && (object->paging_offset != 0)) { + panic("vm_object_iopl_request: external object with non-zero paging offset\n"); + } - if (((size/PAGE_SIZE) > MAX_UPL_SIZE) && !object->phys_contiguous) - size = MAX_UPL_SIZE * PAGE_SIZE; - if (cntrl_flags & UPL_SET_INTERNAL) { - if (page_list_count != NULL) - *page_list_count = MAX_UPL_SIZE; + VM_DEBUG_CONSTANT_EVENT(vm_object_iopl_request, VM_IOPL_REQUEST, DBG_FUNC_START, size, cntrl_flags, prot, 0); + +#if CONFIG_IOSCHED || UPL_DEBUG + if ((object->io_tracking && object != kernel_object) || upl_debug_enabled) { + io_tracking_flag |= UPL_CREATE_IO_TRACKING; } - if (((cntrl_flags & UPL_SET_INTERNAL) && !(object->phys_contiguous)) && - ((page_list_count != NULL) && (*page_list_count != 0) && *page_list_count < (size/page_size))) - return KERN_INVALID_ARGUMENT; +#endif - if ((!object->internal) && (object->paging_offset != 0)) - panic("vm_object_iopl_request: external object with non-zero paging offset\n"); +#if CONFIG_IOSCHED + if (object->io_tracking) { + /* Check if we're dealing with the kernel object. We do not support expedite on kernel object UPLs */ + if (object != kernel_object) { + io_tracking_flag |= UPL_CREATE_EXPEDITE_SUP; + } + } +#endif + + if (object->phys_contiguous) { + psize = PAGE_SIZE; + } else { + psize = size; + dw_count = 0; + dw_limit = DELAYED_WORK_LIMIT(DEFAULT_DELAYED_WORK_LIMIT); + dwp_start = vm_page_delayed_work_get_ctx(); + if (dwp_start == NULL) { + dwp_start = &dw_array; + dw_limit = 1; + dwp_finish_ctx = FALSE; + } - if (object->phys_contiguous) - psize = PAGE_SIZE; - else - psize = size; + dwp = dwp_start; + } if (cntrl_flags & UPL_SET_INTERNAL) { - upl = upl_create(UPL_CREATE_INTERNAL | UPL_CREATE_LITE, UPL_IO_WIRE, psize); + upl = upl_create(UPL_CREATE_INTERNAL | UPL_CREATE_LITE | io_tracking_flag, UPL_IO_WIRE, psize); user_page_list = (upl_page_info_t *) (((uintptr_t)upl) + sizeof(struct upl)); lite_list = (wpl_array_t) (((uintptr_t)user_page_list) + - ((psize / PAGE_SIZE) * sizeof(upl_page_info_t))); + ((psize / PAGE_SIZE) * sizeof(upl_page_info_t))); if (size == 0) { user_page_list = NULL; lite_list = NULL; } } else { - upl = upl_create(UPL_CREATE_LITE, UPL_IO_WIRE, psize); + upl = upl_create(UPL_CREATE_LITE | io_tracking_flag, UPL_IO_WIRE, psize); lite_list = (wpl_array_t) (((uintptr_t)upl) + sizeof(struct upl)); if (size == 0) { lite_list = NULL; } } - if (user_page_list) - user_page_list[0].device = FALSE; + if (user_page_list) { + user_page_list[0].device = FALSE; + } *upl_ptr = upl; + if (cntrl_flags & UPL_NOZEROFILLIO) { + DTRACE_VM4(upl_nozerofillio, + vm_object_t, object, + vm_object_offset_t, offset, + upl_size_t, size, + upl_t, upl); + } + upl->map_object = object; - upl->size = size; + upl->u_offset = original_offset; + upl->u_size = original_size; + + size_in_pages = size / PAGE_SIZE; if (object == kernel_object && !(cntrl_flags & (UPL_NEED_32BIT_ADDR | UPL_BLOCK_ACCESS))) { @@ -5545,21 +9048,24 @@ vm_object_iopl_request( /* * paging in progress also protects the paging_offset */ - upl->offset = offset + object->paging_offset; + upl->u_offset = original_offset + object->paging_offset; if (cntrl_flags & UPL_BLOCK_ACCESS) { /* - * The user requested that access to the pages in this URL + * The user requested that access to the pages in this UPL * be blocked until the UPL is commited or aborted. */ upl->flags |= UPL_ACCESS_BLOCKED; } - if (object->phys_contiguous) { -#if UPL_DEBUG +#if CONFIG_IOSCHED || UPL_DEBUG + if ((upl->flags & UPL_TRACKED_BY_OBJECT) || upl_debug_enabled) { + vm_object_activity_begin(object); queue_enter(&object->uplq, upl, upl_t, uplq); -#endif /* UPL_DEBUG */ + } +#endif + if (object->phys_contiguous) { if (upl->flags & UPL_ACCESS_BLOCKED) { assert(!object->blocked_access); object->blocked_access = TRUE; @@ -5573,34 +9079,56 @@ vm_object_iopl_request( */ upl->flags |= UPL_DEVICE_MEMORY; - upl->highest_page = (ppnum_t) ((offset + object->shadow_offset + size - 1)>>PAGE_SHIFT); + upl->highest_page = (ppnum_t) ((offset + object->vo_shadow_offset + size - 1) >> PAGE_SHIFT); if (user_page_list) { - user_page_list[0].phys_addr = (ppnum_t) ((offset + object->shadow_offset)>>PAGE_SHIFT); + user_page_list[0].phys_addr = (ppnum_t) ((offset + object->vo_shadow_offset) >> PAGE_SHIFT); user_page_list[0].device = TRUE; } if (page_list_count != NULL) { - if (upl->flags & UPL_INTERNAL) - *page_list_count = 0; - else - *page_list_count = 1; + if (upl->flags & UPL_INTERNAL) { + *page_list_count = 0; + } else { + *page_list_count = 1; + } } + + VM_DEBUG_CONSTANT_EVENT(vm_object_iopl_request, VM_IOPL_REQUEST, DBG_FUNC_END, page_grab_count, KERN_SUCCESS, 0, 0); +#if DEVELOPMENT || DEBUG + if (task != NULL) { + ledger_credit(task->ledger, task_ledgers.pages_grabbed_iopl, page_grab_count); + } +#endif /* DEVELOPMENT || DEBUG */ return KERN_SUCCESS; } - if (object != kernel_object) { + if (object != kernel_object && object != compressor_object) { /* * Protect user space from future COW operations */ +#if VM_OBJECT_TRACKING_OP_TRUESHARE + if (!object->true_share && + vm_object_tracking_inited) { + void *bt[VM_OBJECT_TRACKING_BTDEPTH]; + int num = 0; + + num = OSBacktrace(bt, + VM_OBJECT_TRACKING_BTDEPTH); + btlog_add_entry(vm_object_tracking_btlog, + object, + VM_OBJECT_TRACKING_OP_TRUESHARE, + bt, + num); + } +#endif /* VM_OBJECT_TRACKING_OP_TRUESHARE */ + + vm_object_lock_assert_exclusive(object); object->true_share = TRUE; - if (object->copy_strategy == MEMORY_OBJECT_COPY_SYMMETRIC) + if (object->copy_strategy == MEMORY_OBJECT_COPY_SYMMETRIC) { object->copy_strategy = MEMORY_OBJECT_COPY_DELAY; + } } -#if UPL_DEBUG - queue_enter(&object->uplq, upl, upl_t, uplq); -#endif /* UPL_DEBUG */ - if (!(cntrl_flags & UPL_COPYOUT_FROM) && object->copy != VM_OBJECT_NULL) { /* @@ -5621,154 +9149,246 @@ vm_object_iopl_request( * code path for that... */ vm_object_update(object, - offset, - size, - NULL, - NULL, - FALSE, /* should_return */ - MEMORY_OBJECT_COPY_SYNC, - VM_PROT_NO_CHANGE); -#if DEVELOPMENT || DEBUG - iopl_cow++; - iopl_cow_pages += size >> PAGE_SHIFT; -#endif + offset, + size, + NULL, + NULL, + FALSE, /* should_return */ + MEMORY_OBJECT_COPY_SYNC, + VM_PROT_NO_CHANGE); + VM_PAGEOUT_DEBUG(iopl_cow, 1); + VM_PAGEOUT_DEBUG(iopl_cow_pages, (size >> PAGE_SHIFT)); + } + if (!(cntrl_flags & (UPL_NEED_32BIT_ADDR | UPL_BLOCK_ACCESS)) && + object->purgable != VM_PURGABLE_VOLATILE && + object->purgable != VM_PURGABLE_EMPTY && + object->copy == NULL && + size == object->vo_size && + offset == 0 && + object->shadow == NULL && + object->pager == NULL) { + if (object->resident_page_count == size_in_pages) { + assert(object != compressor_object); + assert(object != kernel_object); + fast_path_full_req = TRUE; + } else if (object->resident_page_count == 0) { + assert(object != compressor_object); + assert(object != kernel_object); + fast_path_empty_req = TRUE; + set_cache_attr_needed = TRUE; + } } + if (cntrl_flags & UPL_SET_INTERRUPTIBLE) { + interruptible = THREAD_ABORTSAFE; + } else { + interruptible = THREAD_UNINT; + } entry = 0; xfer_size = size; dst_offset = offset; + if (fast_path_full_req) { + if (vm_object_iopl_wire_full(object, upl, user_page_list, lite_list, cntrl_flags, tag) == TRUE) { + goto finish; + } + /* + * we couldn't complete the processing of this request on the fast path + * so fall through to the slow path and finish up + */ + } else if (fast_path_empty_req) { + if (cntrl_flags & UPL_REQUEST_NO_FAULT) { + ret = KERN_MEMORY_ERROR; + goto return_err; + } + ret = vm_object_iopl_wire_empty(object, upl, user_page_list, lite_list, cntrl_flags, tag, &dst_offset, size_in_pages, &page_grab_count); + + if (ret) { + free_wired_pages = TRUE; + goto return_err; + } + goto finish; + } + fault_info.behavior = VM_BEHAVIOR_SEQUENTIAL; - fault_info.user_tag = 0; fault_info.lo_offset = offset; fault_info.hi_offset = offset + xfer_size; - fault_info.no_cache = FALSE; - fault_info.stealth = FALSE; - - dwp = &dw_array[0]; - dw_count = 0; + fault_info.mark_zf_absent = TRUE; + fault_info.interruptible = interruptible; + fault_info.batch_pmap_op = TRUE; while (xfer_size) { - vm_fault_return_t result; - unsigned int pg_num; + vm_fault_return_t result; dwp->dw_mask = 0; + if (fast_path_full_req) { + /* + * if we get here, it means that we ran into a page + * state we couldn't handle in the fast path and + * bailed out to the slow path... since the order + * we look at pages is different between the 2 paths, + * the following check is needed to determine whether + * this page was already processed in the fast path + */ + if (lite_list[entry >> 5] & (1 << (entry & 31))) { + goto skip_page; + } + } dst_page = vm_page_lookup(object, dst_offset); - /* - * ENCRYPTED SWAP: - * If the page is encrypted, we need to decrypt it, - * so force a soft page fault. - */ if (dst_page == VM_PAGE_NULL || - dst_page->busy || - dst_page->encrypted || - dst_page->error || - dst_page->restart || - dst_page->absent || - dst_page->fictitious) { - - if (object == kernel_object) - panic("vm_object_iopl_request: missing/bad page in kernel object\n"); - - do { - vm_page_t top_page; - kern_return_t error_code; - int interruptible; + dst_page->vmp_busy || + dst_page->vmp_error || + dst_page->vmp_restart || + dst_page->vmp_absent || + dst_page->vmp_fictitious) { + if (object == kernel_object) { + panic("vm_object_iopl_request: missing/bad page in kernel object\n"); + } + if (object == compressor_object) { + panic("vm_object_iopl_request: missing/bad page in compressor object\n"); + } - if (cntrl_flags & UPL_SET_INTERRUPTIBLE) - interruptible = THREAD_ABORTSAFE; - else - interruptible = THREAD_UNINT; + if (cntrl_flags & UPL_REQUEST_NO_FAULT) { + ret = KERN_MEMORY_ERROR; + goto return_err; + } + set_cache_attr_needed = TRUE; - fault_info.interruptible = interruptible; - fault_info.cluster_size = xfer_size; + /* + * We just looked up the page and the result remains valid + * until the object lock is release, so send it to + * vm_fault_page() (as "dst_page"), to avoid having to + * look it up again there. + */ + caller_lookup = TRUE; - vm_object_paging_begin(object); + do { + vm_page_t top_page; + kern_return_t error_code; - result = vm_fault_page(object, dst_offset, - prot | VM_PROT_WRITE, FALSE, - &prot, &dst_page, &top_page, - (int *)0, - &error_code, no_zero_fill, - FALSE, &fault_info); + fault_info.cluster_size = xfer_size; - switch (result) { + vm_object_paging_begin(object); - case VM_FAULT_SUCCESS: + result = vm_fault_page(object, dst_offset, + prot | VM_PROT_WRITE, FALSE, + caller_lookup, + &prot, &dst_page, &top_page, + (int *)0, + &error_code, no_zero_fill, + FALSE, &fault_info); - PAGE_WAKEUP_DONE(dst_page); - /* - * Release paging references and - * top-level placeholder page, if any. - */ - if (top_page != VM_PAGE_NULL) { - vm_object_t local_object; + /* our lookup is no longer valid at this point */ + caller_lookup = FALSE; - local_object = top_page->object; + switch (result) { + case VM_FAULT_SUCCESS: + page_grab_count++; - if (top_page->object != dst_page->object) { - vm_object_lock(local_object); - VM_PAGE_FREE(top_page); - vm_object_paging_end(local_object); - vm_object_unlock(local_object); + if (!dst_page->vmp_absent) { + PAGE_WAKEUP_DONE(dst_page); } else { - VM_PAGE_FREE(top_page); - vm_object_paging_end(local_object); + /* + * we only get back an absent page if we + * requested that it not be zero-filled + * because we are about to fill it via I/O + * + * absent pages should be left BUSY + * to prevent them from being faulted + * into an address space before we've + * had a chance to complete the I/O on + * them since they may contain info that + * shouldn't be seen by the faulting task + */ } - } - vm_object_paging_end(object); - break; - - case VM_FAULT_RETRY: - vm_object_lock(object); - break; + /* + * Release paging references and + * top-level placeholder page, if any. + */ + if (top_page != VM_PAGE_NULL) { + vm_object_t local_object; - case VM_FAULT_FICTITIOUS_SHORTAGE: - vm_page_more_fictitious(); + local_object = VM_PAGE_OBJECT(top_page); - vm_object_lock(object); - break; + /* + * comparing 2 packed pointers + */ + if (top_page->vmp_object != dst_page->vmp_object) { + vm_object_lock(local_object); + VM_PAGE_FREE(top_page); + vm_object_paging_end(local_object); + vm_object_unlock(local_object); + } else { + VM_PAGE_FREE(top_page); + vm_object_paging_end(local_object); + } + } + vm_object_paging_end(object); + break; - case VM_FAULT_MEMORY_SHORTAGE: - if (vm_page_wait(interruptible)) { + case VM_FAULT_RETRY: vm_object_lock(object); break; - } - /* fall thru */ - case VM_FAULT_INTERRUPTED: - error_code = MACH_SEND_INTERRUPTED; - case VM_FAULT_MEMORY_ERROR: - memory_error: - ret = (error_code ? error_code: KERN_MEMORY_ERROR); + case VM_FAULT_MEMORY_SHORTAGE: + OSAddAtomic((size_in_pages - entry), &vm_upl_wait_for_pages); - vm_object_lock(object); - goto return_err; + VM_DEBUG_EVENT(vm_iopl_page_wait, VM_IOPL_PAGE_WAIT, DBG_FUNC_START, vm_upl_wait_for_pages, 0, 0, 0); - case VM_FAULT_SUCCESS_NO_VM_PAGE: - /* success but no page: fail */ - vm_object_paging_end(object); - vm_object_unlock(object); - goto memory_error; + if (vm_page_wait(interruptible)) { + OSAddAtomic(-(size_in_pages - entry), &vm_upl_wait_for_pages); - default: - panic("vm_object_iopl_request: unexpected error" - " 0x%x from vm_fault_page()\n", result); - } - } while (result != VM_FAULT_SUCCESS); + VM_DEBUG_EVENT(vm_iopl_page_wait, VM_IOPL_PAGE_WAIT, DBG_FUNC_END, vm_upl_wait_for_pages, 0, 0, 0); + vm_object_lock(object); + + break; + } + OSAddAtomic(-(size_in_pages - entry), &vm_upl_wait_for_pages); + + VM_DEBUG_EVENT(vm_iopl_page_wait, VM_IOPL_PAGE_WAIT, DBG_FUNC_END, vm_upl_wait_for_pages, 0, 0, -1); + + OS_FALLTHROUGH; + + case VM_FAULT_INTERRUPTED: + error_code = MACH_SEND_INTERRUPTED; + OS_FALLTHROUGH; + case VM_FAULT_MEMORY_ERROR: +memory_error: + ret = (error_code ? error_code: KERN_MEMORY_ERROR); + vm_object_lock(object); + goto return_err; + + case VM_FAULT_SUCCESS_NO_VM_PAGE: + /* success but no page: fail */ + vm_object_paging_end(object); + vm_object_unlock(object); + goto memory_error; + + default: + panic("vm_object_iopl_request: unexpected error" + " 0x%x from vm_fault_page()\n", result); + } + } while (result != VM_FAULT_SUCCESS); + } + phys_page = VM_PAGE_GET_PHYS_PAGE(dst_page); + + if (upl->flags & UPL_KERNEL_OBJECT) { + goto record_phys_addr; } - if (upl->flags & UPL_KERNEL_OBJECT) + if (dst_page->vmp_q_state == VM_PAGE_USED_BY_COMPRESSOR) { + dst_page->vmp_busy = TRUE; goto record_phys_addr; + } - if (dst_page->cleaning) { + if (dst_page->vmp_cleaning) { /* - * Someone else is cleaning this page in place.as + * Someone else is cleaning this page in place. * In theory, we should be able to proceed and use this * page but they'll probably end up clearing the "busy" * bit on it in upl_commit_range() but they didn't set @@ -5777,14 +9397,18 @@ vm_object_iopl_request( * We'd better wait for the cleaning to complete and * then try again. */ - vm_object_iopl_request_sleep_for_cleaning++; + VM_PAGEOUT_DEBUG(vm_object_iopl_request_sleep_for_cleaning, 1); PAGE_SLEEP(object, dst_page, THREAD_UNINT); continue; } - if ( (cntrl_flags & UPL_NEED_32BIT_ADDR) && - dst_page->phys_page >= (max_valid_dma_address >> PAGE_SHIFT) ) { - vm_page_t low_page; - int refmod; + if (dst_page->vmp_laundry) { + vm_pageout_steal_laundry(dst_page, FALSE); + } + + if ((cntrl_flags & UPL_NEED_32BIT_ADDR) && + phys_page >= (max_valid_dma_address >> PAGE_SHIFT)) { + vm_page_t low_page; + int refmod; /* * support devices that can't DMA above 32 bits @@ -5795,13 +9419,13 @@ vm_object_iopl_request( * handed out to some other 64 bit capable DMA device to use */ if (VM_PAGE_WIRED(dst_page)) { - ret = KERN_PROTECTION_FAILURE; + ret = KERN_PROTECTION_FAILURE; goto return_err; } low_page = vm_page_grablo(); if (low_page == VM_PAGE_NULL) { - ret = KERN_RESOURCE_SHORTAGE; + ret = KERN_RESOURCE_SHORTAGE; goto return_err; } /* @@ -5811,19 +9435,26 @@ vm_object_iopl_request( * it after we disconnect it... we want the fault * to find the new page being substituted. */ - if (dst_page->pmapped) - refmod = pmap_disconnect(dst_page->phys_page); - else - refmod = 0; - vm_page_copy(dst_page, low_page); - - low_page->reference = dst_page->reference; - low_page->dirty = dst_page->dirty; - - if (refmod & VM_MEM_REFERENCED) - low_page->reference = TRUE; - if (refmod & VM_MEM_MODIFIED) - low_page->dirty = TRUE; + if (dst_page->vmp_pmapped) { + refmod = pmap_disconnect(phys_page); + } else { + refmod = 0; + } + + if (!dst_page->vmp_absent) { + vm_page_copy(dst_page, low_page); + } + + low_page->vmp_reference = dst_page->vmp_reference; + low_page->vmp_dirty = dst_page->vmp_dirty; + low_page->vmp_absent = dst_page->vmp_absent; + + if (refmod & VM_MEM_REFERENCED) { + low_page->vmp_reference = TRUE; + } + if (refmod & VM_MEM_MODIFIED) { + SET_PAGE_DIRTY(low_page, FALSE); + } vm_page_replace(low_page, object, dst_offset); @@ -5833,18 +9464,25 @@ vm_object_iopl_request( * BUSY... we don't need a PAGE_WAKEUP_DONE * here, because we've never dropped the object lock */ - dst_page->busy = FALSE; + if (!dst_page->vmp_absent) { + dst_page->vmp_busy = FALSE; + } + + phys_page = VM_PAGE_GET_PHYS_PAGE(dst_page); + } + if (!dst_page->vmp_busy) { + dwp->dw_mask |= DW_vm_page_wire; } - dwp->dw_mask |= DW_vm_page_wire; if (cntrl_flags & UPL_BLOCK_ACCESS) { /* * Mark the page "busy" to block any future page fault - * on this page. We'll also remove the mapping + * on this page in addition to wiring it. + * We'll also remove the mapping * of all these pages before leaving this routine. */ - assert(!dst_page->fictitious); - dst_page->busy = TRUE; + assert(!dst_page->vmp_fictitious); + dst_page->vmp_busy = TRUE; } /* * expect the page to be used @@ -5852,72 +9490,103 @@ vm_object_iopl_request( */ dwp->dw_mask |= DW_set_reference; - if (!(cntrl_flags & UPL_COPYOUT_FROM)) - dst_page->dirty = TRUE; + if (!(cntrl_flags & UPL_COPYOUT_FROM)) { + SET_PAGE_DIRTY(dst_page, TRUE); + /* + * Page belonging to a code-signed object is about to + * be written. Mark it tainted and disconnect it from + * all pmaps so processes have to fault it back in and + * deal with the tainted bit. + */ + if (object->code_signed && dst_page->vmp_cs_tainted != VMP_CS_ALL_TRUE) { + dst_page->vmp_cs_tainted = VMP_CS_ALL_TRUE; + vm_page_iopl_tainted++; + if (dst_page->vmp_pmapped) { + int refmod = pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(dst_page)); + if (refmod & VM_MEM_REFERENCED) { + dst_page->vmp_reference = TRUE; + } + } + } + } + if ((cntrl_flags & UPL_REQUEST_FORCE_COHERENCY) && dst_page->vmp_written_by_kernel == TRUE) { + pmap_sync_page_attributes_phys(phys_page); + dst_page->vmp_written_by_kernel = FALSE; + } + record_phys_addr: - pg_num = (unsigned int) ((dst_offset-offset)/PAGE_SIZE); - assert(pg_num == (dst_offset-offset)/PAGE_SIZE); - lite_list[pg_num>>5] |= 1 << (pg_num & 31); + if (dst_page->vmp_busy) { + upl->flags |= UPL_HAS_BUSY; + } + + lite_list[entry >> 5] |= 1U << (entry & 31); - if (dst_page->phys_page > upl->highest_page) - upl->highest_page = dst_page->phys_page; + if (phys_page > upl->highest_page) { + upl->highest_page = phys_page; + } if (user_page_list) { - user_page_list[entry].phys_addr = dst_page->phys_page; - user_page_list[entry].pageout = dst_page->pageout; - user_page_list[entry].absent = dst_page->absent; - user_page_list[entry].dirty = dst_page->dirty; - user_page_list[entry].precious = dst_page->precious; - user_page_list[entry].device = FALSE; - if (dst_page->clustered == TRUE) - user_page_list[entry].speculative = dst_page->speculative; - else - user_page_list[entry].speculative = FALSE; - user_page_list[entry].cs_validated = dst_page->cs_validated; - user_page_list[entry].cs_tainted = dst_page->cs_tainted; + user_page_list[entry].phys_addr = phys_page; + user_page_list[entry].free_when_done = dst_page->vmp_free_when_done; + user_page_list[entry].absent = dst_page->vmp_absent; + user_page_list[entry].dirty = dst_page->vmp_dirty; + user_page_list[entry].precious = dst_page->vmp_precious; + user_page_list[entry].device = FALSE; + user_page_list[entry].needed = FALSE; + if (dst_page->vmp_clustered == TRUE) { + user_page_list[entry].speculative = (dst_page->vmp_q_state == VM_PAGE_ON_SPECULATIVE_Q) ? TRUE : FALSE; + } else { + user_page_list[entry].speculative = FALSE; + } + user_page_list[entry].cs_validated = dst_page->vmp_cs_validated; + user_page_list[entry].cs_tainted = dst_page->vmp_cs_tainted; + user_page_list[entry].cs_nx = dst_page->vmp_cs_nx; + user_page_list[entry].mark = FALSE; } - if (object != kernel_object) { + if (object != kernel_object && object != compressor_object) { /* * someone is explicitly grabbing this page... * update clustered and speculative state - * + * */ - VM_PAGE_CONSUME_CLUSTERED(dst_page); + if (dst_page->vmp_clustered) { + VM_PAGE_CONSUME_CLUSTERED(dst_page); + } } +skip_page: entry++; dst_offset += PAGE_SIZE_64; xfer_size -= PAGE_SIZE; if (dwp->dw_mask) { - if (dst_page->busy == FALSE) { - /* - * dw_do_work may need to drop the object lock - * if it does, we need the pages it's looking at to - * be held stable via the busy bit. - */ - dst_page->busy = TRUE; - dwp->dw_mask |= (DW_clear_busy | DW_PAGE_WAKEUP); - } - dwp->dw_m = dst_page; - dwp++; - dw_count++; + VM_PAGE_ADD_DELAYED_WORK(dwp, dst_page, dw_count); - if (dw_count >= DELAYED_WORK_LIMIT) { - dw_do_work(object, &dw_array[0], dw_count); - - dwp = &dw_array[0]; + if (dw_count >= dw_limit) { + vm_page_do_delayed_work(object, tag, dwp_start, dw_count); + + dwp = dwp_start; dw_count = 0; } } } - if (dw_count) - dw_do_work(object, &dw_array[0], dw_count); + assert(entry == size_in_pages); + + if (dw_count) { + vm_page_do_delayed_work(object, tag, dwp_start, dw_count); + dwp = dwp_start; + dw_count = 0; + } +finish: + if (user_page_list && set_cache_attr_needed == TRUE) { + vm_object_set_pmap_cache_attr(object, user_page_list, size_in_pages, TRUE); + } if (page_list_count != NULL) { - if (upl->flags & UPL_INTERNAL) + if (upl->flags & UPL_INTERNAL) { *page_list_count = 0; - else if (*page_list_count > entry) - *page_list_count = entry; + } else if (*page_list_count > size_in_pages) { + *page_list_count = size_in_pages; + } } vm_object_unlock(object); @@ -5929,59 +9598,120 @@ record_phys_addr: * can't be accessed without causing a page fault. */ vm_object_pmap_protect(object, offset, (vm_object_size_t)size, - PMAP_NULL, 0, VM_PROT_NONE); + PMAP_NULL, + PAGE_SIZE, + 0, VM_PROT_NONE); assert(!object->blocked_access); object->blocked_access = TRUE; } + + VM_DEBUG_CONSTANT_EVENT(vm_object_iopl_request, VM_IOPL_REQUEST, DBG_FUNC_END, page_grab_count, KERN_SUCCESS, 0, 0); +#if DEVELOPMENT || DEBUG + if (task != NULL) { + ledger_credit(task->ledger, task_ledgers.pages_grabbed_iopl, page_grab_count); + } +#endif /* DEVELOPMENT || DEBUG */ + + if (dwp_start && dwp_finish_ctx) { + vm_page_delayed_work_finish_ctx(dwp_start); + dwp_start = dwp = NULL; + } + return KERN_SUCCESS; return_err: dw_index = 0; for (; offset < dst_offset; offset += PAGE_SIZE) { - dst_page = vm_page_lookup(object, offset); + boolean_t need_unwire; + + dst_page = vm_page_lookup(object, offset); - if (dst_page == VM_PAGE_NULL) - panic("vm_object_iopl_request: Wired pages missing. \n"); + if (dst_page == VM_PAGE_NULL) { + panic("vm_object_iopl_request: Wired page missing. \n"); + } + + /* + * if we've already processed this page in an earlier + * dw_do_work, we need to undo the wiring... we will + * leave the dirty and reference bits on if they + * were set, since we don't have a good way of knowing + * what the previous state was and we won't get here + * under any normal circumstances... we will always + * clear BUSY and wakeup any waiters via vm_page_free + * or PAGE_WAKEUP_DONE + */ + need_unwire = TRUE; if (dw_count) { - if (dw_array[dw_index].dw_m == dst_page) { + if ((dwp_start)[dw_index].dw_m == dst_page) { + /* + * still in the deferred work list + * which means we haven't yet called + * vm_page_wire on this page + */ + need_unwire = FALSE; + dw_index++; dw_count--; - continue; } } - vm_page_lockspin_queues(); - vm_page_unwire(dst_page); + vm_page_lock_queues(); + + if (dst_page->vmp_absent || free_wired_pages == TRUE) { + vm_page_free(dst_page); + + need_unwire = FALSE; + } else { + if (need_unwire == TRUE) { + vm_page_unwire(dst_page, TRUE); + } + + PAGE_WAKEUP_DONE(dst_page); + } vm_page_unlock_queues(); - VM_STAT_INCR(reactivations); + if (need_unwire == TRUE) { + VM_STAT_INCR(reactivations); + } } #if UPL_DEBUG upl->upl_state = 2; #endif - if (! (upl->flags & UPL_KERNEL_OBJECT)) { + if (!(upl->flags & UPL_KERNEL_OBJECT)) { vm_object_activity_end(object); + vm_object_collapse(object, 0, TRUE); } vm_object_unlock(object); upl_destroy(upl); + VM_DEBUG_CONSTANT_EVENT(vm_object_iopl_request, VM_IOPL_REQUEST, DBG_FUNC_END, page_grab_count, ret, 0, 0); +#if DEVELOPMENT || DEBUG + if (task != NULL) { + ledger_credit(task->ledger, task_ledgers.pages_grabbed_iopl, page_grab_count); + } +#endif /* DEVELOPMENT || DEBUG */ + + if (dwp_start && dwp_finish_ctx) { + vm_page_delayed_work_finish_ctx(dwp_start); + dwp_start = dwp = NULL; + } return ret; } kern_return_t upl_transpose( - upl_t upl1, - upl_t upl2) + upl_t upl1, + upl_t upl2) { - kern_return_t retval; - boolean_t upls_locked; - vm_object_t object1, object2; + kern_return_t retval; + boolean_t upls_locked; + vm_object_t object1, object2; - if (upl1 == UPL_NULL || upl2 == UPL_NULL || upl1 == upl2 || ((upl1->flags & UPL_VECTOR)==UPL_VECTOR) || ((upl2->flags & UPL_VECTOR)==UPL_VECTOR)) { + if (upl1 == UPL_NULL || upl2 == UPL_NULL || upl1 == upl2 || ((upl1->flags & UPL_VECTOR) == UPL_VECTOR) || ((upl2->flags & UPL_VECTOR) == UPL_VECTOR)) { return KERN_INVALID_ARGUMENT; } - + upls_locked = FALSE; /* @@ -5995,13 +9725,13 @@ upl_transpose( upl_lock(upl2); upl_lock(upl1); } - upls_locked = TRUE; /* the UPLs will need to be unlocked */ + upls_locked = TRUE; /* the UPLs will need to be unlocked */ object1 = upl1->map_object; object2 = upl2->map_object; - if (upl1->offset != 0 || upl2->offset != 0 || - upl1->size != upl2->size) { + if (upl1->u_offset != 0 || upl2->u_offset != 0 || + upl1->u_size != upl2->u_size) { /* * We deal only with full objects, not subsets. * That's because we exchange the entire backing store info @@ -6016,22 +9746,39 @@ upl_transpose( * Tranpose the VM objects' backing store. */ retval = vm_object_transpose(object1, object2, - (vm_object_size_t) upl1->size); + upl_adjusted_size(upl1, PAGE_MASK)); if (retval == KERN_SUCCESS) { /* * Make each UPL point to the correct VM object, i.e. the * object holding the pages that the UPL refers to... */ -#if UPL_DEBUG - queue_remove(&object1->uplq, upl1, upl_t, uplq); - queue_remove(&object2->uplq, upl2, upl_t, uplq); +#if CONFIG_IOSCHED || UPL_DEBUG + if ((upl1->flags & UPL_TRACKED_BY_OBJECT) || (upl2->flags & UPL_TRACKED_BY_OBJECT)) { + vm_object_lock(object1); + vm_object_lock(object2); + } + if ((upl1->flags & UPL_TRACKED_BY_OBJECT) || upl_debug_enabled) { + queue_remove(&object1->uplq, upl1, upl_t, uplq); + } + if ((upl2->flags & UPL_TRACKED_BY_OBJECT) || upl_debug_enabled) { + queue_remove(&object2->uplq, upl2, upl_t, uplq); + } #endif upl1->map_object = object2; upl2->map_object = object1; -#if UPL_DEBUG - queue_enter(&object1->uplq, upl2, upl_t, uplq); - queue_enter(&object2->uplq, upl1, upl_t, uplq); + +#if CONFIG_IOSCHED || UPL_DEBUG + if ((upl1->flags & UPL_TRACKED_BY_OBJECT) || upl_debug_enabled) { + queue_enter(&object2->uplq, upl1, upl_t, uplq); + } + if ((upl2->flags & UPL_TRACKED_BY_OBJECT) || upl_debug_enabled) { + queue_enter(&object1->uplq, upl2, upl_t, uplq); + } + if ((upl1->flags & UPL_TRACKED_BY_OBJECT) || (upl2->flags & UPL_TRACKED_BY_OBJECT)) { + vm_object_unlock(object2); + vm_object_unlock(object1); + } #endif } @@ -6048,68 +9795,59 @@ done: return retval; } +void +upl_range_needed( + upl_t upl, + int index, + int count) +{ + upl_page_info_t *user_page_list; + int size_in_pages; + + if (!(upl->flags & UPL_INTERNAL) || count <= 0) { + return; + } + + size_in_pages = upl_adjusted_size(upl, PAGE_MASK) / PAGE_SIZE; + + user_page_list = (upl_page_info_t *) (((uintptr_t)upl) + sizeof(struct upl)); + + while (count-- && index < size_in_pages) { + user_page_list[index++].needed = TRUE; + } +} + + /* - * ENCRYPTED SWAP: - * - * Rationale: the user might have some encrypted data on disk (via - * FileVault or any other mechanism). That data is then decrypted in - * memory, which is safe as long as the machine is secure. But that - * decrypted data in memory could be paged out to disk by the default - * pager. The data would then be stored on disk in clear (not encrypted) - * and it could be accessed by anyone who gets physical access to the - * disk (if the laptop or the disk gets stolen for example). This weakens - * the security offered by FileVault. - * - * Solution: the default pager will optionally request that all the - * pages it gathers for pageout be encrypted, via the UPL interfaces, - * before it sends this UPL to disk via the vnode_pageout() path. - * - * Notes: - * - * To avoid disrupting the VM LRU algorithms, we want to keep the - * clean-in-place mechanisms, which allow us to send some extra pages to - * swap (clustering) without actually removing them from the user's - * address space. We don't want the user to unknowingly access encrypted - * data, so we have to actually remove the encrypted pages from the page - * table. When the user accesses the data, the hardware will fail to - * locate the virtual page in its page table and will trigger a page - * fault. We can then decrypt the page and enter it in the page table - * again. Whenever we allow the user to access the contents of a page, - * we have to make sure it's not encrypted. - * - * - */ -/* - * ENCRYPTED SWAP: * Reserve of virtual addresses in the kernel address space. * We need to map the physical pages in the kernel, so that we - * can call the encryption/decryption routines with a kernel + * can call the code-signing or slide routines with a kernel * virtual address. We keep this pool of pre-allocated kernel * virtual addresses so that we don't have to scan the kernel's - * virtaul address space each time we need to encrypt or decrypt + * virtaul address space each time we need to work with * a physical page. - * It would be nice to be able to encrypt and decrypt in physical - * mode but that might not always be more efficient... */ -decl_simple_lock_data(,vm_paging_lock) -#define VM_PAGING_NUM_PAGES 64 +SIMPLE_LOCK_DECLARE(vm_paging_lock, 0); +#define VM_PAGING_NUM_PAGES 64 vm_map_offset_t vm_paging_base_address = 0; -boolean_t vm_paging_page_inuse[VM_PAGING_NUM_PAGES] = { FALSE, }; -int vm_paging_max_index = 0; -int vm_paging_page_waiter = 0; -int vm_paging_page_waiter_total = 0; -unsigned long vm_paging_no_kernel_page = 0; -unsigned long vm_paging_objects_mapped = 0; -unsigned long vm_paging_pages_mapped = 0; -unsigned long vm_paging_objects_mapped_slow = 0; -unsigned long vm_paging_pages_mapped_slow = 0; - +boolean_t vm_paging_page_inuse[VM_PAGING_NUM_PAGES] = { FALSE, }; +int vm_paging_max_index = 0; +int vm_paging_page_waiter = 0; +int vm_paging_page_waiter_total = 0; + +unsigned long vm_paging_no_kernel_page = 0; +unsigned long vm_paging_objects_mapped = 0; +unsigned long vm_paging_pages_mapped = 0; +unsigned long vm_paging_objects_mapped_slow = 0; +unsigned long vm_paging_pages_mapped_slow = 0; + +__startup_func void vm_paging_map_init(void) { - kern_return_t kr; - vm_map_offset_t page_map_offset; - vm_map_entry_t map_entry; + kern_return_t kr; + vm_map_offset_t page_map_offset; + vm_map_entry_t map_entry; assert(vm_paging_base_address == 0); @@ -6119,16 +9857,21 @@ vm_paging_map_init(void) */ page_map_offset = 0; kr = vm_map_find_space(kernel_map, - &page_map_offset, - VM_PAGING_NUM_PAGES * PAGE_SIZE, - 0, - 0, - &map_entry); + &page_map_offset, + VM_PAGING_NUM_PAGES * PAGE_SIZE, + 0, + 0, + VM_MAP_KERNEL_FLAGS_NONE, + VM_KERN_MEMORY_NONE, + &map_entry); if (kr != KERN_SUCCESS) { panic("vm_paging_map_init: kernel_map full\n"); } - map_entry->object.vm_object = kernel_object; - map_entry->offset = page_map_offset; + VME_OBJECT_SET(map_entry, kernel_object); + VME_OFFSET_SET(map_entry, page_map_offset); + map_entry->protection = VM_PROT_NONE; + map_entry->max_protection = VM_PROT_NONE; + map_entry->permanent = TRUE; vm_object_reference(kernel_object); vm_map_unlock(kernel_map); @@ -6137,45 +9880,50 @@ vm_paging_map_init(void) } /* - * ENCRYPTED SWAP: * vm_paging_map_object: * Maps part of a VM object's pages in the kernel - * virtual address space, using the pre-allocated + * virtual address space, using the pre-allocated * kernel virtual addresses, if possible. * Context: - * The VM object is locked. This lock will get - * dropped and re-acquired though, so the caller - * must make sure the VM object is kept alive + * The VM object is locked. This lock will get + * dropped and re-acquired though, so the caller + * must make sure the VM object is kept alive * (by holding a VM map that has a reference - * on it, for example, or taking an extra reference). - * The page should also be kept busy to prevent + * on it, for example, or taking an extra reference). + * The page should also be kept busy to prevent * it from being reclaimed. */ kern_return_t vm_paging_map_object( - vm_map_offset_t *address, - vm_page_t page, - vm_object_t object, - vm_object_offset_t offset, - vm_map_size_t *size, - vm_prot_t protection, - boolean_t can_unlock_object) + vm_page_t page, + vm_object_t object, + vm_object_offset_t offset, + vm_prot_t protection, + boolean_t can_unlock_object, + vm_map_size_t *size, /* IN/OUT */ + vm_map_offset_t *address, /* OUT */ + boolean_t *need_unmap) /* OUT */ { - kern_return_t kr; - vm_map_offset_t page_map_offset; - vm_map_size_t map_size; - vm_object_offset_t object_offset; - int i; + kern_return_t kr; + vm_map_offset_t page_map_offset; + vm_map_size_t map_size; + vm_object_offset_t object_offset; + int i; - if (page != VM_PAGE_NULL && *size == PAGE_SIZE) { - assert(page->busy); + /* use permanent 1-to-1 kernel mapping of physical memory ? */ + *address = (vm_map_offset_t) + phystokv((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(page) << PAGE_SHIFT); + *need_unmap = FALSE; + return KERN_SUCCESS; + + assert(page->vmp_busy); /* * Use one of the pre-allocated kernel virtual addresses * and just enter the VM page in the kernel address space * at that virtual address. */ - simple_lock(&vm_paging_lock); + simple_lock(&vm_paging_lock, &vm_pageout_lck_grp); /* * Try and find an available kernel virtual address @@ -6186,8 +9934,8 @@ vm_paging_map_object( for (i = 0; i < VM_PAGING_NUM_PAGES; i++) { if (vm_paging_page_inuse[i] == FALSE) { page_map_offset = - vm_paging_base_address + - (i * PAGE_SIZE); + vm_paging_base_address + + (i * PAGE_SIZE); break; } } @@ -6209,9 +9957,12 @@ vm_paging_map_object( */ vm_paging_page_waiter_total++; vm_paging_page_waiter++; - thread_sleep_fast_usimple_lock(&vm_paging_page_waiter, - &vm_paging_lock, - THREAD_UNINT); + kr = assert_wait((event_t)&vm_paging_page_waiter, THREAD_UNINT); + if (kr == THREAD_WAITING) { + simple_unlock(&vm_paging_lock); + kr = thread_block(THREAD_CONTINUE_NULL); + simple_lock(&vm_paging_lock, &vm_pageout_lck_grp); + } vm_paging_page_waiter--; /* ... and try again */ } @@ -6227,27 +9978,31 @@ vm_paging_map_object( vm_paging_page_inuse[i] = TRUE; simple_unlock(&vm_paging_lock); - if (page->pmapped == FALSE) { - pmap_sync_page_data_phys(page->phys_page); - } - page->pmapped = TRUE; + page->vmp_pmapped = TRUE; /* * Keep the VM object locked over the PMAP_ENTER * and the actual use of the page by the kernel, - * or this pmap mapping might get undone by a + * or this pmap mapping might get undone by a * vm_object_pmap_protect() call... */ PMAP_ENTER(kernel_pmap, - page_map_offset, - page, - protection, - ((int) page->object->wimg_bits & - VM_WIMG_MASK), - TRUE); + page_map_offset, + page, + protection, + VM_PROT_NONE, + 0, + TRUE, + kr); + assert(kr == KERN_SUCCESS); vm_paging_objects_mapped++; - vm_paging_pages_mapped++; + vm_paging_pages_mapped++; *address = page_map_offset; + *need_unmap = TRUE; + +#if KASAN + kasan_notify_address(page_map_offset, PAGE_SIZE); +#endif /* all done and mapped, ready to use ! */ return KERN_SUCCESS; @@ -6262,36 +10017,43 @@ vm_paging_map_object( simple_unlock(&vm_paging_lock); } - if (! can_unlock_object) { + if (!can_unlock_object) { + *address = 0; + *size = 0; + *need_unmap = FALSE; return KERN_NOT_SUPPORTED; } object_offset = vm_object_trunc_page(offset); - map_size = vm_map_round_page(*size); + map_size = vm_map_round_page(*size, + VM_MAP_PAGE_MASK(kernel_map)); /* * Try and map the required range of the object * in the kernel_map */ - vm_object_reference_locked(object); /* for the map entry */ + vm_object_reference_locked(object); /* for the map entry */ vm_object_unlock(object); kr = vm_map_enter(kernel_map, - address, - map_size, - 0, - VM_FLAGS_ANYWHERE, - object, - object_offset, - FALSE, - protection, - VM_PROT_ALL, - VM_INHERIT_NONE); + address, + map_size, + 0, + VM_FLAGS_ANYWHERE, + VM_MAP_KERNEL_FLAGS_NONE, + VM_KERN_MEMORY_NONE, + object, + object_offset, + FALSE, + protection, + VM_PROT_ALL, + VM_INHERIT_NONE); if (kr != KERN_SUCCESS) { *address = 0; *size = 0; - vm_object_deallocate(object); /* for the map entry */ + *need_unmap = FALSE; + vm_object_deallocate(object); /* for the map entry */ vm_object_lock(object); return kr; } @@ -6310,65 +10072,67 @@ vm_paging_map_object( */ for (page_map_offset = 0; - map_size != 0; - map_size -= PAGE_SIZE_64, page_map_offset += PAGE_SIZE_64) { - unsigned int cache_attr; - + map_size != 0; + map_size -= PAGE_SIZE_64, page_map_offset += PAGE_SIZE_64) { page = vm_page_lookup(object, offset + page_map_offset); if (page == VM_PAGE_NULL) { printf("vm_paging_map_object: no page !?"); vm_object_unlock(object); kr = vm_map_remove(kernel_map, *address, *size, - VM_MAP_NO_FLAGS); + VM_MAP_REMOVE_NO_FLAGS); assert(kr == KERN_SUCCESS); *address = 0; *size = 0; + *need_unmap = FALSE; vm_object_lock(object); return KERN_MEMORY_ERROR; } - if (page->pmapped == FALSE) { - pmap_sync_page_data_phys(page->phys_page); - } - page->pmapped = TRUE; - cache_attr = ((unsigned int) object->wimg_bits) & VM_WIMG_MASK; + page->vmp_pmapped = TRUE; - //assert(pmap_verify_free(page->phys_page)); + //assert(pmap_verify_free(VM_PAGE_GET_PHYS_PAGE(page))); PMAP_ENTER(kernel_pmap, - *address + page_map_offset, - page, - protection, - cache_attr, - TRUE); + *address + page_map_offset, + page, + protection, + VM_PROT_NONE, + 0, + TRUE, + kr); + assert(kr == KERN_SUCCESS); +#if KASAN + kasan_notify_address(*address + page_map_offset, PAGE_SIZE); +#endif } - + vm_paging_objects_mapped_slow++; vm_paging_pages_mapped_slow += (unsigned long) (map_size / PAGE_SIZE_64); + *need_unmap = TRUE; + return KERN_SUCCESS; } /* - * ENCRYPTED SWAP: * vm_paging_unmap_object: * Unmaps part of a VM object's pages from the kernel - * virtual address space. + * virtual address space. * Context: - * The VM object is locked. This lock will get - * dropped and re-acquired though. + * The VM object is locked. This lock will get + * dropped and re-acquired though. */ void vm_paging_unmap_object( - vm_object_t object, - vm_map_offset_t start, - vm_map_offset_t end) + vm_object_t object, + vm_map_offset_t start, + vm_map_offset_t end) { - kern_return_t kr; - int i; + kern_return_t kr; + int i; if ((vm_paging_base_address == 0) || (start < vm_paging_base_address) || (end > (vm_paging_base_address - + (VM_PAGING_NUM_PAGES * PAGE_SIZE)))) { + + (VM_PAGING_NUM_PAGES * PAGE_SIZE)))) { /* * We didn't use our pre-allocated pool of * kernel virtual address. Deallocate the @@ -6377,7 +10141,8 @@ vm_paging_unmap_object( if (object != VM_OBJECT_NULL) { vm_object_unlock(object); } - kr = vm_map_remove(kernel_map, start, end, VM_MAP_NO_FLAGS); + kr = vm_map_remove(kernel_map, start, end, + VM_MAP_REMOVE_NO_FLAGS); if (object != VM_OBJECT_NULL) { vm_object_lock(object); } @@ -6388,565 +10153,34 @@ vm_paging_unmap_object( * pre-allocated pool. Put it back in the pool * for next time. */ - assert(end - start == PAGE_SIZE); - i = (int) ((start - vm_paging_base_address) >> PAGE_SHIFT); - assert(i >= 0 && i < VM_PAGING_NUM_PAGES); - - /* undo the pmap mapping */ - pmap_remove(kernel_pmap, start, end); - - simple_lock(&vm_paging_lock); - vm_paging_page_inuse[i] = FALSE; - if (vm_paging_page_waiter) { - thread_wakeup(&vm_paging_page_waiter); - } - simple_unlock(&vm_paging_lock); - } -} - -#if CRYPTO -/* - * Encryption data. - * "iv" is the "initial vector". Ideally, we want to - * have a different one for each page we encrypt, so that - * crackers can't find encryption patterns too easily. - */ -#define SWAP_CRYPT_AES_KEY_SIZE 128 /* XXX 192 and 256 don't work ! */ -boolean_t swap_crypt_ctx_initialized = FALSE; -aes_32t swap_crypt_key[8]; /* big enough for a 256 key */ -aes_ctx swap_crypt_ctx; -const unsigned char swap_crypt_null_iv[AES_BLOCK_SIZE] = {0xa, }; - -#if DEBUG -boolean_t swap_crypt_ctx_tested = FALSE; -unsigned char swap_crypt_test_page_ref[4096] __attribute__((aligned(4096))); -unsigned char swap_crypt_test_page_encrypt[4096] __attribute__((aligned(4096))); -unsigned char swap_crypt_test_page_decrypt[4096] __attribute__((aligned(4096))); -#endif /* DEBUG */ - -/* - * Initialize the encryption context: key and key size. - */ -void swap_crypt_ctx_initialize(void); /* forward */ -void -swap_crypt_ctx_initialize(void) -{ - unsigned int i; - - /* - * No need for locking to protect swap_crypt_ctx_initialized - * because the first use of encryption will come from the - * pageout thread (we won't pagein before there's been a pageout) - * and there's only one pageout thread. - */ - if (swap_crypt_ctx_initialized == FALSE) { - for (i = 0; - i < (sizeof (swap_crypt_key) / - sizeof (swap_crypt_key[0])); - i++) { - swap_crypt_key[i] = random(); - } - aes_encrypt_key((const unsigned char *) swap_crypt_key, - SWAP_CRYPT_AES_KEY_SIZE, - &swap_crypt_ctx.encrypt); - aes_decrypt_key((const unsigned char *) swap_crypt_key, - SWAP_CRYPT_AES_KEY_SIZE, - &swap_crypt_ctx.decrypt); - swap_crypt_ctx_initialized = TRUE; - } - -#if DEBUG - /* - * Validate the encryption algorithms. - */ - if (swap_crypt_ctx_tested == FALSE) { - /* initialize */ - for (i = 0; i < 4096; i++) { - swap_crypt_test_page_ref[i] = (char) i; - } - /* encrypt */ - aes_encrypt_cbc(swap_crypt_test_page_ref, - swap_crypt_null_iv, - PAGE_SIZE / AES_BLOCK_SIZE, - swap_crypt_test_page_encrypt, - &swap_crypt_ctx.encrypt); - /* decrypt */ - aes_decrypt_cbc(swap_crypt_test_page_encrypt, - swap_crypt_null_iv, - PAGE_SIZE / AES_BLOCK_SIZE, - swap_crypt_test_page_decrypt, - &swap_crypt_ctx.decrypt); - /* compare result with original */ - for (i = 0; i < 4096; i ++) { - if (swap_crypt_test_page_decrypt[i] != - swap_crypt_test_page_ref[i]) { - panic("encryption test failed"); - } - } - - /* encrypt again */ - aes_encrypt_cbc(swap_crypt_test_page_decrypt, - swap_crypt_null_iv, - PAGE_SIZE / AES_BLOCK_SIZE, - swap_crypt_test_page_decrypt, - &swap_crypt_ctx.encrypt); - /* decrypt in place */ - aes_decrypt_cbc(swap_crypt_test_page_decrypt, - swap_crypt_null_iv, - PAGE_SIZE / AES_BLOCK_SIZE, - swap_crypt_test_page_decrypt, - &swap_crypt_ctx.decrypt); - for (i = 0; i < 4096; i ++) { - if (swap_crypt_test_page_decrypt[i] != - swap_crypt_test_page_ref[i]) { - panic("in place encryption test failed"); - } - } - - swap_crypt_ctx_tested = TRUE; - } -#endif /* DEBUG */ -} - -/* - * ENCRYPTED SWAP: - * vm_page_encrypt: - * Encrypt the given page, for secure paging. - * The page might already be mapped at kernel virtual - * address "kernel_mapping_offset". Otherwise, we need - * to map it. - * - * Context: - * The page's object is locked, but this lock will be released - * and re-acquired. - * The page is busy and not accessible by users (not entered in any pmap). - */ -void -vm_page_encrypt( - vm_page_t page, - vm_map_offset_t kernel_mapping_offset) -{ - kern_return_t kr; - vm_map_size_t kernel_mapping_size; - vm_offset_t kernel_vaddr; - union { - unsigned char aes_iv[AES_BLOCK_SIZE]; - struct { - memory_object_t pager_object; - vm_object_offset_t paging_offset; - } vm; - } encrypt_iv; - - if (! vm_pages_encrypted) { - vm_pages_encrypted = TRUE; - } - - assert(page->busy); - assert(page->dirty || page->precious); - - if (page->encrypted) { - /* - * Already encrypted: no need to do it again. - */ - vm_page_encrypt_already_encrypted_counter++; - return; - } - ASSERT_PAGE_DECRYPTED(page); - - /* - * Take a paging-in-progress reference to keep the object - * alive even if we have to unlock it (in vm_paging_map_object() - * for example)... - */ - vm_object_paging_begin(page->object); - - if (kernel_mapping_offset == 0) { - /* - * The page hasn't already been mapped in kernel space - * by the caller. Map it now, so that we can access - * its contents and encrypt them. - */ - kernel_mapping_size = PAGE_SIZE; - kr = vm_paging_map_object(&kernel_mapping_offset, - page, - page->object, - page->offset, - &kernel_mapping_size, - VM_PROT_READ | VM_PROT_WRITE, - FALSE); - if (kr != KERN_SUCCESS) { - panic("vm_page_encrypt: " - "could not map page in kernel: 0x%x\n", - kr); - } - } else { - kernel_mapping_size = 0; - } - kernel_vaddr = CAST_DOWN(vm_offset_t, kernel_mapping_offset); - - if (swap_crypt_ctx_initialized == FALSE) { - swap_crypt_ctx_initialize(); - } - assert(swap_crypt_ctx_initialized); - - /* - * Prepare an "initial vector" for the encryption. - * We use the "pager" and the "paging_offset" for that - * page to obfuscate the encrypted data a bit more and - * prevent crackers from finding patterns that they could - * use to break the key. - */ - bzero(&encrypt_iv.aes_iv[0], sizeof (encrypt_iv.aes_iv)); - encrypt_iv.vm.pager_object = page->object->pager; - encrypt_iv.vm.paging_offset = - page->object->paging_offset + page->offset; - - /* encrypt the "initial vector" */ - aes_encrypt_cbc((const unsigned char *) &encrypt_iv.aes_iv[0], - swap_crypt_null_iv, - 1, - &encrypt_iv.aes_iv[0], - &swap_crypt_ctx.encrypt); - - /* - * Encrypt the page. - */ - aes_encrypt_cbc((const unsigned char *) kernel_vaddr, - &encrypt_iv.aes_iv[0], - PAGE_SIZE / AES_BLOCK_SIZE, - (unsigned char *) kernel_vaddr, - &swap_crypt_ctx.encrypt); - - vm_page_encrypt_counter++; - - /* - * Unmap the page from the kernel's address space, - * if we had to map it ourselves. Otherwise, let - * the caller undo the mapping if needed. - */ - if (kernel_mapping_size != 0) { - vm_paging_unmap_object(page->object, - kernel_mapping_offset, - kernel_mapping_offset + kernel_mapping_size); - } - - /* - * Clear the "reference" and "modified" bits. - * This should clean up any impact the encryption had - * on them. - * The page was kept busy and disconnected from all pmaps, - * so it can't have been referenced or modified from user - * space. - * The software bits will be reset later after the I/O - * has completed (in upl_commit_range()). - */ - pmap_clear_refmod(page->phys_page, VM_MEM_REFERENCED | VM_MEM_MODIFIED); - - page->encrypted = TRUE; - - vm_object_paging_end(page->object); -} - -/* - * ENCRYPTED SWAP: - * vm_page_decrypt: - * Decrypt the given page. - * The page might already be mapped at kernel virtual - * address "kernel_mapping_offset". Otherwise, we need - * to map it. - * - * Context: - * The page's VM object is locked but will be unlocked and relocked. - * The page is busy and not accessible by users (not entered in any pmap). - */ -void -vm_page_decrypt( - vm_page_t page, - vm_map_offset_t kernel_mapping_offset) -{ - kern_return_t kr; - vm_map_size_t kernel_mapping_size; - vm_offset_t kernel_vaddr; - union { - unsigned char aes_iv[AES_BLOCK_SIZE]; - struct { - memory_object_t pager_object; - vm_object_offset_t paging_offset; - } vm; - } decrypt_iv; - - assert(page->busy); - assert(page->encrypted); - - /* - * Take a paging-in-progress reference to keep the object - * alive even if we have to unlock it (in vm_paging_map_object() - * for example)... - */ - vm_object_paging_begin(page->object); - - if (kernel_mapping_offset == 0) { - /* - * The page hasn't already been mapped in kernel space - * by the caller. Map it now, so that we can access - * its contents and decrypt them. - */ - kernel_mapping_size = PAGE_SIZE; - kr = vm_paging_map_object(&kernel_mapping_offset, - page, - page->object, - page->offset, - &kernel_mapping_size, - VM_PROT_READ | VM_PROT_WRITE, - FALSE); - if (kr != KERN_SUCCESS) { - panic("vm_page_decrypt: " - "could not map page in kernel: 0x%x\n", - kr); - } - } else { - kernel_mapping_size = 0; - } - kernel_vaddr = CAST_DOWN(vm_offset_t, kernel_mapping_offset); - - assert(swap_crypt_ctx_initialized); - - /* - * Prepare an "initial vector" for the decryption. - * It has to be the same as the "initial vector" we - * used to encrypt that page. - */ - bzero(&decrypt_iv.aes_iv[0], sizeof (decrypt_iv.aes_iv)); - decrypt_iv.vm.pager_object = page->object->pager; - decrypt_iv.vm.paging_offset = - page->object->paging_offset + page->offset; - - /* encrypt the "initial vector" */ - aes_encrypt_cbc((const unsigned char *) &decrypt_iv.aes_iv[0], - swap_crypt_null_iv, - 1, - &decrypt_iv.aes_iv[0], - &swap_crypt_ctx.encrypt); - - /* - * Decrypt the page. - */ - aes_decrypt_cbc((const unsigned char *) kernel_vaddr, - &decrypt_iv.aes_iv[0], - PAGE_SIZE / AES_BLOCK_SIZE, - (unsigned char *) kernel_vaddr, - &swap_crypt_ctx.decrypt); - vm_page_decrypt_counter++; - - /* - * Unmap the page from the kernel's address space, - * if we had to map it ourselves. Otherwise, let - * the caller undo the mapping if needed. - */ - if (kernel_mapping_size != 0) { - vm_paging_unmap_object(page->object, - kernel_vaddr, - kernel_vaddr + PAGE_SIZE); - } - - /* - * After decryption, the page is actually clean. - * It was encrypted as part of paging, which "cleans" - * the "dirty" pages. - * Noone could access it after it was encrypted - * and the decryption doesn't count. - */ - page->dirty = FALSE; - assert (page->cs_validated == FALSE); - pmap_clear_refmod(page->phys_page, VM_MEM_MODIFIED | VM_MEM_REFERENCED); - page->encrypted = FALSE; - - /* - * We've just modified the page's contents via the data cache and part - * of the new contents might still be in the cache and not yet in RAM. - * Since the page is now available and might get gathered in a UPL to - * be part of a DMA transfer from a driver that expects the memory to - * be coherent at this point, we have to flush the data cache. - */ - pmap_sync_page_attributes_phys(page->phys_page); - /* - * Since the page is not mapped yet, some code might assume that it - * doesn't need to invalidate the instruction cache when writing to - * that page. That code relies on "pmapped" being FALSE, so that the - * caches get synchronized when the page is first mapped. - */ - assert(pmap_verify_free(page->phys_page)); - page->pmapped = FALSE; - page->wpmapped = FALSE; - - vm_object_paging_end(page->object); -} - -#if DEVELOPMENT || DEBUG -unsigned long upl_encrypt_upls = 0; -unsigned long upl_encrypt_pages = 0; -#endif - -/* - * ENCRYPTED SWAP: - * - * upl_encrypt: - * Encrypts all the pages in the UPL, within the specified range. - * - */ -void -upl_encrypt( - upl_t upl, - upl_offset_t crypt_offset, - upl_size_t crypt_size) -{ - upl_size_t upl_size, subupl_size=crypt_size; - upl_offset_t offset_in_upl, subupl_offset=crypt_offset; - vm_object_t upl_object; - vm_object_offset_t upl_offset; - vm_page_t page; - vm_object_t shadow_object; - vm_object_offset_t shadow_offset; - vm_object_offset_t paging_offset; - vm_object_offset_t base_offset; - int isVectorUPL = 0; - upl_t vector_upl = NULL; - - if((isVectorUPL = vector_upl_is_valid(upl))) - vector_upl = upl; - -process_upl_to_encrypt: - if(isVectorUPL) { - crypt_size = subupl_size; - crypt_offset = subupl_offset; - upl = vector_upl_subupl_byoffset(vector_upl, &crypt_offset, &crypt_size); - if(upl == NULL) - panic("upl_encrypt: Accessing a sub-upl that doesn't exist\n"); - subupl_size -= crypt_size; - subupl_offset += crypt_size; - } - -#if DEVELOPMENT || DEBUG - upl_encrypt_upls++; - upl_encrypt_pages += crypt_size / PAGE_SIZE; -#endif - upl_object = upl->map_object; - upl_offset = upl->offset; - upl_size = upl->size; - - vm_object_lock(upl_object); - - /* - * Find the VM object that contains the actual pages. - */ - if (upl_object->pageout) { - shadow_object = upl_object->shadow; - /* - * The offset in the shadow object is actually also - * accounted for in upl->offset. It possibly shouldn't be - * this way, but for now don't account for it twice. - */ - shadow_offset = 0; - assert(upl_object->paging_offset == 0); /* XXX ? */ - vm_object_lock(shadow_object); - } else { - shadow_object = upl_object; - shadow_offset = 0; - } - - paging_offset = shadow_object->paging_offset; - vm_object_paging_begin(shadow_object); - - if (shadow_object != upl_object) - vm_object_unlock(upl_object); - - - base_offset = shadow_offset; - base_offset += upl_offset; - base_offset += crypt_offset; - base_offset -= paging_offset; - - assert(crypt_offset + crypt_size <= upl_size); - - for (offset_in_upl = 0; - offset_in_upl < crypt_size; - offset_in_upl += PAGE_SIZE) { - page = vm_page_lookup(shadow_object, - base_offset + offset_in_upl); - if (page == VM_PAGE_NULL) { - panic("upl_encrypt: " - "no page for (obj=%p,off=%lld+%d)!\n", - shadow_object, - base_offset, - offset_in_upl); - } - /* - * Disconnect the page from all pmaps, so that nobody can - * access it while it's encrypted. After that point, all - * accesses to this page will cause a page fault and block - * while the page is busy being encrypted. After the - * encryption completes, any access will cause a - * page fault and the page gets decrypted at that time. - */ - pmap_disconnect(page->phys_page); - vm_page_encrypt(page, 0); - - if (vm_object_lock_avoid(shadow_object)) { - /* - * Give vm_pageout_scan() a chance to convert more - * pages from "clean-in-place" to "clean-and-free", - * if it's interested in the same pages we selected - * in this cluster. - */ - vm_object_unlock(shadow_object); - mutex_pause(2); - vm_object_lock(shadow_object); - } - } - - vm_object_paging_end(shadow_object); - vm_object_unlock(shadow_object); - - if(isVectorUPL && subupl_size) - goto process_upl_to_encrypt; -} - -#else /* CRYPTO */ -void -upl_encrypt( - __unused upl_t upl, - __unused upl_offset_t crypt_offset, - __unused upl_size_t crypt_size) -{ -} + assert(end - start == PAGE_SIZE); + i = (int) ((start - vm_paging_base_address) >> PAGE_SHIFT); + assert(i >= 0 && i < VM_PAGING_NUM_PAGES); -void -vm_page_encrypt( - __unused vm_page_t page, - __unused vm_map_offset_t kernel_mapping_offset) -{ -} + /* undo the pmap mapping */ + pmap_remove(kernel_pmap, start, end); -void -vm_page_decrypt( - __unused vm_page_t page, - __unused vm_map_offset_t kernel_mapping_offset) -{ + simple_lock(&vm_paging_lock, &vm_pageout_lck_grp); + vm_paging_page_inuse[i] = FALSE; + if (vm_paging_page_waiter) { + thread_wakeup(&vm_paging_page_waiter); + } + simple_unlock(&vm_paging_lock); + } } -#endif /* CRYPTO */ +/* + * page->vmp_object must be locked + */ void -vm_pageout_queue_steal(vm_page_t page, boolean_t queues_locked) +vm_pageout_steal_laundry(vm_page_t page, boolean_t queues_locked) { - page->list_req_pending = FALSE; - page->cleaning = FALSE; - page->pageout = FALSE; - if (!queues_locked) { vm_page_lockspin_queues(); } + page->vmp_free_when_done = FALSE; /* * need to drop the laundry count... * we may also need to remove it @@ -6955,21 +10189,7 @@ vm_pageout_queue_steal(vm_page_t page, boolean_t queues_locked) * * the laundry and pageout_queue flags are cleared... */ -#if CONFIG_EMBEDDED - if (page->laundry) - vm_pageout_throttle_up(page); -#else vm_pageout_throttle_up(page); -#endif - - /* - * toss the wire count we picked up - * when we intially set this page up - * to be cleaned... - */ - vm_page_unwire(page); - - vm_page_steal_pageout_page++; if (!queues_locked) { vm_page_unlock_queues(); @@ -6979,24 +10199,23 @@ vm_pageout_queue_steal(vm_page_t page, boolean_t queues_locked) upl_t vector_upl_create(vm_offset_t upl_offset) { - int vector_upl_size = sizeof(struct _vector_upl); - int i=0; - upl_t upl; + int vector_upl_size = sizeof(struct _vector_upl); + int i = 0; + upl_t upl; vector_upl_t vector_upl = (vector_upl_t)kalloc(vector_upl_size); - upl = upl_create(0,UPL_VECTOR,0); + upl = upl_create(0, UPL_VECTOR, 0); upl->vector_upl = vector_upl; - upl->offset = upl_offset; + upl->u_offset = upl_offset; vector_upl->size = 0; vector_upl->offset = upl_offset; - vector_upl->invalid_upls=0; - vector_upl->num_upls=0; + vector_upl->invalid_upls = 0; + vector_upl->num_upls = 0; vector_upl->pagelist = NULL; - - for(i=0; i < MAX_VECTOR_UPL_ELEMENTS ; i++) { + + for (i = 0; i < MAX_VECTOR_UPL_ELEMENTS; i++) { vector_upl->upl_iostates[i].size = 0; vector_upl->upl_iostates[i].offset = 0; - } return upl; } @@ -7004,125 +10223,132 @@ vector_upl_create(vm_offset_t upl_offset) void vector_upl_deallocate(upl_t upl) { - if(upl) { + if (upl) { vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl) { - if(vector_upl->invalid_upls != vector_upl->num_upls) + if (vector_upl) { + if (vector_upl->invalid_upls != vector_upl->num_upls) { panic("Deallocating non-empty Vectored UPL\n"); - kfree(vector_upl->pagelist,(sizeof(struct upl_page_info)*(vector_upl->size/PAGE_SIZE))); - vector_upl->invalid_upls=0; + } + kfree(vector_upl->pagelist, (sizeof(struct upl_page_info) * (vector_upl->size / PAGE_SIZE))); + vector_upl->invalid_upls = 0; vector_upl->num_upls = 0; vector_upl->pagelist = NULL; vector_upl->size = 0; vector_upl->offset = 0; kfree(vector_upl, sizeof(struct _vector_upl)); - vector_upl = (vector_upl_t)0xdeadbeef; - } - else + vector_upl = (vector_upl_t)0xfeedfeed; + } else { panic("vector_upl_deallocate was passed a non-vectored upl\n"); - } - else + } + } else { panic("vector_upl_deallocate was passed a NULL upl\n"); + } } boolean_t vector_upl_is_valid(upl_t upl) { - if(upl && ((upl->flags & UPL_VECTOR)==UPL_VECTOR)) { + if (upl && ((upl->flags & UPL_VECTOR) == UPL_VECTOR)) { vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl == NULL || vector_upl == (vector_upl_t)0xdeadbeef || vector_upl == (vector_upl_t)0xfeedbeef) + if (vector_upl == NULL || vector_upl == (vector_upl_t)0xfeedfeed || vector_upl == (vector_upl_t)0xfeedbeef) { return FALSE; - else + } else { return TRUE; + } } return FALSE; } boolean_t -vector_upl_set_subupl(upl_t upl,upl_t subupl, uint32_t io_size) +vector_upl_set_subupl(upl_t upl, upl_t subupl, uint32_t io_size) { - if(vector_upl_is_valid(upl)) { + if (vector_upl_is_valid(upl)) { vector_upl_t vector_upl = upl->vector_upl; - - if(vector_upl) { - if(subupl) { - if(io_size) { - if(io_size < PAGE_SIZE) + + if (vector_upl) { + if (subupl) { + if (io_size) { + if (io_size < PAGE_SIZE) { io_size = PAGE_SIZE; + } subupl->vector_upl = (void*)vector_upl; vector_upl->upl_elems[vector_upl->num_upls++] = subupl; vector_upl->size += io_size; - upl->size += io_size; - } - else { - uint32_t i=0,invalid_upls=0; - for(i = 0; i < vector_upl->num_upls; i++) { - if(vector_upl->upl_elems[i] == subupl) + upl->u_size += io_size; + } else { + uint32_t i = 0, invalid_upls = 0; + for (i = 0; i < vector_upl->num_upls; i++) { + if (vector_upl->upl_elems[i] == subupl) { break; + } } - if(i == vector_upl->num_upls) + if (i == vector_upl->num_upls) { panic("Trying to remove sub-upl when none exists"); - + } + vector_upl->upl_elems[i] = NULL; - invalid_upls = hw_atomic_add(&(vector_upl)->invalid_upls, 1); - if(invalid_upls == vector_upl->num_upls) + invalid_upls = os_atomic_inc(&(vector_upl)->invalid_upls, + relaxed); + if (invalid_upls == vector_upl->num_upls) { return TRUE; - else + } else { return FALSE; + } } - } - else + } else { panic("vector_upl_set_subupl was passed a NULL upl element\n"); - } - else + } + } else { panic("vector_upl_set_subupl was passed a non-vectored upl\n"); - } - else + } + } else { panic("vector_upl_set_subupl was passed a NULL upl\n"); + } return FALSE; -} +} void vector_upl_set_pagelist(upl_t upl) { - if(vector_upl_is_valid(upl)) { - uint32_t i=0; + if (vector_upl_is_valid(upl)) { + uint32_t i = 0; vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl) { - vm_offset_t pagelist_size=0, cur_upl_pagelist_size=0; + if (vector_upl) { + vm_offset_t pagelist_size = 0, cur_upl_pagelist_size = 0; - vector_upl->pagelist = (upl_page_info_array_t)kalloc(sizeof(struct upl_page_info)*(vector_upl->size/PAGE_SIZE)); - - for(i=0; i < vector_upl->num_upls; i++) { - cur_upl_pagelist_size = sizeof(struct upl_page_info) * vector_upl->upl_elems[i]->size/PAGE_SIZE; + vector_upl->pagelist = (upl_page_info_array_t)kalloc(sizeof(struct upl_page_info) * (vector_upl->size / PAGE_SIZE)); + + for (i = 0; i < vector_upl->num_upls; i++) { + cur_upl_pagelist_size = sizeof(struct upl_page_info) * upl_adjusted_size(vector_upl->upl_elems[i], PAGE_MASK) / PAGE_SIZE; bcopy(UPL_GET_INTERNAL_PAGE_LIST_SIMPLE(vector_upl->upl_elems[i]), (char*)vector_upl->pagelist + pagelist_size, cur_upl_pagelist_size); pagelist_size += cur_upl_pagelist_size; - if(vector_upl->upl_elems[i]->highest_page > upl->highest_page) + if (vector_upl->upl_elems[i]->highest_page > upl->highest_page) { upl->highest_page = vector_upl->upl_elems[i]->highest_page; + } } - assert( pagelist_size == (sizeof(struct upl_page_info)*(vector_upl->size/PAGE_SIZE)) ); - } - else + assert( pagelist_size == (sizeof(struct upl_page_info) * (vector_upl->size / PAGE_SIZE))); + } else { panic("vector_upl_set_pagelist was passed a non-vectored upl\n"); - } - else + } + } else { panic("vector_upl_set_pagelist was passed a NULL upl\n"); - + } } upl_t vector_upl_subupl_byindex(upl_t upl, uint32_t index) { - if(vector_upl_is_valid(upl)) { + if (vector_upl_is_valid(upl)) { vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl) { - if(index < vector_upl->num_upls) + if (vector_upl) { + if (index < vector_upl->num_upls) { return vector_upl->upl_elems[index]; - } - else + } + } else { panic("vector_upl_subupl_byindex was passed a non-vectored upl\n"); + } } return NULL; } @@ -7130,39 +10356,42 @@ vector_upl_subupl_byindex(upl_t upl, uint32_t index) upl_t vector_upl_subupl_byoffset(upl_t upl, upl_offset_t *upl_offset, upl_size_t *upl_size) { - if(vector_upl_is_valid(upl)) { - uint32_t i=0; + if (vector_upl_is_valid(upl)) { + uint32_t i = 0; vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl) { + if (vector_upl) { upl_t subupl = NULL; vector_upl_iostates_t subupl_state; - for(i=0; i < vector_upl->num_upls; i++) { + for (i = 0; i < vector_upl->num_upls; i++) { subupl = vector_upl->upl_elems[i]; subupl_state = vector_upl->upl_iostates[i]; - if( *upl_offset <= (subupl_state.offset + subupl_state.size - 1)) { + if (*upl_offset <= (subupl_state.offset + subupl_state.size - 1)) { /* We could have been passed an offset/size pair that belongs * to an UPL element that has already been committed/aborted. * If so, return NULL. */ - if(subupl == NULL) + if (subupl == NULL) { return NULL; - if((subupl_state.offset + subupl_state.size) < (*upl_offset + *upl_size)) { + } + if ((subupl_state.offset + subupl_state.size) < (*upl_offset + *upl_size)) { *upl_size = (subupl_state.offset + subupl_state.size) - *upl_offset; - if(*upl_size > subupl_state.size) + if (*upl_size > subupl_state.size) { *upl_size = subupl_state.size; + } } - if(*upl_offset >= subupl_state.offset) + if (*upl_offset >= subupl_state.offset) { *upl_offset -= subupl_state.offset; - else if(i) + } else if (i) { panic("Vector UPL offset miscalculation\n"); + } return subupl; - } + } } - } - else + } else { panic("vector_upl_subupl_byoffset was passed a non-vectored UPL\n"); + } } return NULL; } @@ -7172,107 +10401,112 @@ vector_upl_get_submap(upl_t upl, vm_map_t *v_upl_submap, vm_offset_t *submap_dst { *v_upl_submap = NULL; - if(vector_upl_is_valid(upl)) { + if (vector_upl_is_valid(upl)) { vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl) { + if (vector_upl) { *v_upl_submap = vector_upl->submap; *submap_dst_addr = vector_upl->submap_dst_addr; - } - else + } else { panic("vector_upl_get_submap was passed a non-vectored UPL\n"); - } - else + } + } else { panic("vector_upl_get_submap was passed a null UPL\n"); + } } void vector_upl_set_submap(upl_t upl, vm_map_t submap, vm_offset_t submap_dst_addr) { - if(vector_upl_is_valid(upl)) { + if (vector_upl_is_valid(upl)) { vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl) { + if (vector_upl) { vector_upl->submap = submap; vector_upl->submap_dst_addr = submap_dst_addr; - } - else + } else { panic("vector_upl_get_submap was passed a non-vectored UPL\n"); - } - else + } + } else { panic("vector_upl_get_submap was passed a NULL UPL\n"); + } } void vector_upl_set_iostate(upl_t upl, upl_t subupl, upl_offset_t offset, upl_size_t size) { - if(vector_upl_is_valid(upl)) { + if (vector_upl_is_valid(upl)) { uint32_t i = 0; vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl) { - for(i = 0; i < vector_upl->num_upls; i++) { - if(vector_upl->upl_elems[i] == subupl) + if (vector_upl) { + for (i = 0; i < vector_upl->num_upls; i++) { + if (vector_upl->upl_elems[i] == subupl) { break; + } } - - if(i == vector_upl->num_upls) + + if (i == vector_upl->num_upls) { panic("setting sub-upl iostate when none exists"); + } vector_upl->upl_iostates[i].offset = offset; - if(size < PAGE_SIZE) + if (size < PAGE_SIZE) { size = PAGE_SIZE; + } vector_upl->upl_iostates[i].size = size; - } - else + } else { panic("vector_upl_set_iostate was passed a non-vectored UPL\n"); - } - else + } + } else { panic("vector_upl_set_iostate was passed a NULL UPL\n"); + } } void vector_upl_get_iostate(upl_t upl, upl_t subupl, upl_offset_t *offset, upl_size_t *size) { - if(vector_upl_is_valid(upl)) { + if (vector_upl_is_valid(upl)) { uint32_t i = 0; vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl) { - for(i = 0; i < vector_upl->num_upls; i++) { - if(vector_upl->upl_elems[i] == subupl) + if (vector_upl) { + for (i = 0; i < vector_upl->num_upls; i++) { + if (vector_upl->upl_elems[i] == subupl) { break; + } } - - if(i == vector_upl->num_upls) + + if (i == vector_upl->num_upls) { panic("getting sub-upl iostate when none exists"); + } *offset = vector_upl->upl_iostates[i].offset; *size = vector_upl->upl_iostates[i].size; - } - else + } else { panic("vector_upl_get_iostate was passed a non-vectored UPL\n"); - } - else + } + } else { panic("vector_upl_get_iostate was passed a NULL UPL\n"); + } } void vector_upl_get_iostate_byindex(upl_t upl, uint32_t index, upl_offset_t *offset, upl_size_t *size) { - if(vector_upl_is_valid(upl)) { + if (vector_upl_is_valid(upl)) { vector_upl_t vector_upl = upl->vector_upl; - if(vector_upl) { - if(index < vector_upl->num_upls) { + if (vector_upl) { + if (index < vector_upl->num_upls) { *offset = vector_upl->upl_iostates[index].offset; *size = vector_upl->upl_iostates[index].size; - } - else + } else { *offset = *size = 0; - } - else + } + } else { panic("vector_upl_get_iostate_byindex was passed a non-vectored UPL\n"); - } - else + } + } else { panic("vector_upl_get_iostate_byindex was passed a NULL UPL\n"); + } } upl_page_info_t * @@ -7295,8 +10529,8 @@ upl_get_internal_pagelist_offset(void) void upl_clear_dirty( - upl_t upl, - boolean_t value) + upl_t upl, + boolean_t value) { if (value) { upl->flags |= UPL_CLEAR_DIRTY; @@ -7305,34 +10539,101 @@ upl_clear_dirty( } } +void +upl_set_referenced( + upl_t upl, + boolean_t value) +{ + upl_lock(upl); + if (value) { + upl->ext_ref_count++; + } else { + if (!upl->ext_ref_count) { + panic("upl_set_referenced not %p\n", upl); + } + upl->ext_ref_count--; + } + upl_unlock(upl); +} + +#if CONFIG_IOSCHED +void +upl_set_blkno( + upl_t upl, + vm_offset_t upl_offset, + int io_size, + int64_t blkno) +{ + int i, j; + if ((upl->flags & UPL_EXPEDITE_SUPPORTED) == 0) { + return; + } + + assert(upl->upl_reprio_info != 0); + for (i = (int)(upl_offset / PAGE_SIZE), j = 0; j < io_size; i++, j += PAGE_SIZE) { + UPL_SET_REPRIO_INFO(upl, i, blkno, io_size); + } +} +#endif + +void inline +memoryshot(unsigned int event, unsigned int control) +{ + if (vm_debug_events) { + KERNEL_DEBUG_CONSTANT1((MACHDBG_CODE(DBG_MACH_VM_PRESSURE, event)) | control, + vm_page_active_count, vm_page_inactive_count, + vm_page_free_count, vm_page_speculative_count, + vm_page_throttled_count); + } else { + (void) event; + (void) control; + } +} #ifdef MACH_BSD -boolean_t upl_device_page(upl_page_info_t *upl) +boolean_t +upl_device_page(upl_page_info_t *upl) +{ + return UPL_DEVICE_PAGE(upl); +} +boolean_t +upl_page_present(upl_page_info_t *upl, int index) { - return(UPL_DEVICE_PAGE(upl)); + return UPL_PAGE_PRESENT(upl, index); } -boolean_t upl_page_present(upl_page_info_t *upl, int index) +boolean_t +upl_speculative_page(upl_page_info_t *upl, int index) { - return(UPL_PAGE_PRESENT(upl, index)); + return UPL_SPECULATIVE_PAGE(upl, index); } -boolean_t upl_speculative_page(upl_page_info_t *upl, int index) +boolean_t +upl_dirty_page(upl_page_info_t *upl, int index) { - return(UPL_SPECULATIVE_PAGE(upl, index)); + return UPL_DIRTY_PAGE(upl, index); } -boolean_t upl_dirty_page(upl_page_info_t *upl, int index) +boolean_t +upl_valid_page(upl_page_info_t *upl, int index) { - return(UPL_DIRTY_PAGE(upl, index)); + return UPL_VALID_PAGE(upl, index); } -boolean_t upl_valid_page(upl_page_info_t *upl, int index) +ppnum_t +upl_phys_page(upl_page_info_t *upl, int index) { - return(UPL_VALID_PAGE(upl, index)); + return UPL_PHYS_PAGE(upl, index); } -ppnum_t upl_phys_page(upl_page_info_t *upl, int index) + +void +upl_page_set_mark(upl_page_info_t *upl, int index, boolean_t v) { - return(UPL_PHYS_PAGE(upl, index)); + upl[index].mark = v; } +boolean_t +upl_page_get_mark(upl_page_info_t *upl, int index) +{ + return upl[index].mark; +} void vm_countdirtypages(void) @@ -7343,186 +10644,313 @@ vm_countdirtypages(void) int precpages; - dpages=0; - pgopages=0; - precpages=0; + dpages = 0; + pgopages = 0; + precpages = 0; vm_page_lock_queues(); - m = (vm_page_t) queue_first(&vm_page_queue_inactive); + m = (vm_page_t) vm_page_queue_first(&vm_page_queue_inactive); do { - if (m ==(vm_page_t )0) break; - - if(m->dirty) dpages++; - if(m->pageout) pgopages++; - if(m->precious) precpages++; + if (m == (vm_page_t)0) { + break; + } - assert(m->object != kernel_object); - m = (vm_page_t) queue_next(&m->pageq); - if (m ==(vm_page_t )0) break; + if (m->vmp_dirty) { + dpages++; + } + if (m->vmp_free_when_done) { + pgopages++; + } + if (m->vmp_precious) { + precpages++; + } - } while (!queue_end(&vm_page_queue_inactive,(queue_entry_t) m)); + assert(VM_PAGE_OBJECT(m) != kernel_object); + m = (vm_page_t) vm_page_queue_next(&m->vmp_pageq); + if (m == (vm_page_t)0) { + break; + } + } while (!vm_page_queue_end(&vm_page_queue_inactive, (vm_page_queue_entry_t) m)); vm_page_unlock_queues(); vm_page_lock_queues(); - m = (vm_page_t) queue_first(&vm_page_queue_throttled); + m = (vm_page_t) vm_page_queue_first(&vm_page_queue_throttled); do { - if (m ==(vm_page_t )0) break; + if (m == (vm_page_t)0) { + break; + } dpages++; - assert(m->dirty); - assert(!m->pageout); - assert(m->object != kernel_object); - m = (vm_page_t) queue_next(&m->pageq); - if (m ==(vm_page_t )0) break; - - } while (!queue_end(&vm_page_queue_throttled,(queue_entry_t) m)); + assert(m->vmp_dirty); + assert(!m->vmp_free_when_done); + assert(VM_PAGE_OBJECT(m) != kernel_object); + m = (vm_page_t) vm_page_queue_next(&m->vmp_pageq); + if (m == (vm_page_t)0) { + break; + } + } while (!vm_page_queue_end(&vm_page_queue_throttled, (vm_page_queue_entry_t) m)); vm_page_unlock_queues(); vm_page_lock_queues(); - m = (vm_page_t) queue_first(&vm_page_queue_zf); + m = (vm_page_t) vm_page_queue_first(&vm_page_queue_anonymous); do { - if (m ==(vm_page_t )0) break; - - if(m->dirty) dpages++; - if(m->pageout) pgopages++; - if(m->precious) precpages++; + if (m == (vm_page_t)0) { + break; + } - assert(m->object != kernel_object); - m = (vm_page_t) queue_next(&m->pageq); - if (m ==(vm_page_t )0) break; + if (m->vmp_dirty) { + dpages++; + } + if (m->vmp_free_when_done) { + pgopages++; + } + if (m->vmp_precious) { + precpages++; + } - } while (!queue_end(&vm_page_queue_zf,(queue_entry_t) m)); + assert(VM_PAGE_OBJECT(m) != kernel_object); + m = (vm_page_t) vm_page_queue_next(&m->vmp_pageq); + if (m == (vm_page_t)0) { + break; + } + } while (!vm_page_queue_end(&vm_page_queue_anonymous, (vm_page_queue_entry_t) m)); vm_page_unlock_queues(); printf("IN Q: %d : %d : %d\n", dpages, pgopages, precpages); - dpages=0; - pgopages=0; - precpages=0; + dpages = 0; + pgopages = 0; + precpages = 0; vm_page_lock_queues(); - m = (vm_page_t) queue_first(&vm_page_queue_active); + m = (vm_page_t) vm_page_queue_first(&vm_page_queue_active); do { - if(m == (vm_page_t )0) break; - if(m->dirty) dpages++; - if(m->pageout) pgopages++; - if(m->precious) precpages++; - - assert(m->object != kernel_object); - m = (vm_page_t) queue_next(&m->pageq); - if(m == (vm_page_t )0) break; + if (m == (vm_page_t)0) { + break; + } + if (m->vmp_dirty) { + dpages++; + } + if (m->vmp_free_when_done) { + pgopages++; + } + if (m->vmp_precious) { + precpages++; + } - } while (!queue_end(&vm_page_queue_active,(queue_entry_t) m)); + assert(VM_PAGE_OBJECT(m) != kernel_object); + m = (vm_page_t) vm_page_queue_next(&m->vmp_pageq); + if (m == (vm_page_t)0) { + break; + } + } while (!vm_page_queue_end(&vm_page_queue_active, (vm_page_queue_entry_t) m)); vm_page_unlock_queues(); printf("AC Q: %d : %d : %d\n", dpages, pgopages, precpages); - } #endif /* MACH_BSD */ -ppnum_t upl_get_highest_page( - upl_t upl) + +#if CONFIG_IOSCHED +int +upl_get_cached_tier(upl_t upl) +{ + assert(upl); + if (upl->flags & UPL_TRACKED_BY_OBJECT) { + return upl->upl_priority; + } + return -1; +} +#endif /* CONFIG_IOSCHED */ + + +void +upl_callout_iodone(upl_t upl) +{ + struct upl_io_completion *upl_ctx = upl->upl_iodone; + + if (upl_ctx) { + void (*iodone_func)(void *, int) = upl_ctx->io_done; + + assert(upl_ctx->io_done); + + (*iodone_func)(upl_ctx->io_context, upl_ctx->io_error); + } +} + +void +upl_set_iodone(upl_t upl, void *upl_iodone) +{ + upl->upl_iodone = (struct upl_io_completion *)upl_iodone; +} + +void +upl_set_iodone_error(upl_t upl, int error) +{ + struct upl_io_completion *upl_ctx = upl->upl_iodone; + + if (upl_ctx) { + upl_ctx->io_error = error; + } +} + + +ppnum_t +upl_get_highest_page( + upl_t upl) +{ + return upl->highest_page; +} + +upl_size_t +upl_get_size( + upl_t upl) +{ + return upl_adjusted_size(upl, PAGE_MASK); +} + +upl_size_t +upl_adjusted_size( + upl_t upl, + vm_map_offset_t pgmask) +{ + vm_object_offset_t start_offset, end_offset; + + start_offset = trunc_page_mask_64(upl->u_offset, pgmask); + end_offset = round_page_mask_64(upl->u_offset + upl->u_size, pgmask); + + return (upl_size_t)(end_offset - start_offset); +} + +vm_object_offset_t +upl_adjusted_offset( + upl_t upl, + vm_map_offset_t pgmask) +{ + return trunc_page_mask_64(upl->u_offset, pgmask); +} + +vm_object_offset_t +upl_get_data_offset( + upl_t upl) { - return upl->highest_page; + return upl->u_offset - upl_adjusted_offset(upl, PAGE_MASK); } -upl_size_t upl_get_size( - upl_t upl) +upl_t +upl_associated_upl(upl_t upl) +{ + return upl->associated_upl; +} + +void +upl_set_associated_upl(upl_t upl, upl_t associated_upl) +{ + upl->associated_upl = associated_upl; +} + +struct vnode * +upl_lookup_vnode(upl_t upl) { - return upl->size; + if (!upl->map_object->internal) { + return vnode_pager_lookup_vnode(upl->map_object->pager); + } else { + return NULL; + } } #if UPL_DEBUG -kern_return_t upl_ubc_alias_set(upl_t upl, uintptr_t alias1, uintptr_t alias2) +kern_return_t +upl_ubc_alias_set(upl_t upl, uintptr_t alias1, uintptr_t alias2) { upl->ubc_alias1 = alias1; upl->ubc_alias2 = alias2; return KERN_SUCCESS; } -int upl_ubc_alias_get(upl_t upl, uintptr_t * al, uintptr_t * al2) +int +upl_ubc_alias_get(upl_t upl, uintptr_t * al, uintptr_t * al2) { - if(al) + if (al) { *al = upl->ubc_alias1; - if(al2) + } + if (al2) { *al2 = upl->ubc_alias2; + } return KERN_SUCCESS; } #endif /* UPL_DEBUG */ +#if VM_PRESSURE_EVENTS +/* + * Upward trajectory. + */ +extern boolean_t vm_compressor_low_on_space(void); - -#if MACH_KDB -#include -#include -#include - -#define printf kdbprintf -void db_pageout(void); - -void -db_vm(void) +boolean_t +VM_PRESSURE_NORMAL_TO_WARNING(void) { - - iprintf("VM Statistics:\n"); - db_indent += 2; - iprintf("pages:\n"); - db_indent += 2; - iprintf("activ %5d inact %5d free %5d", - vm_page_active_count, vm_page_inactive_count, - vm_page_free_count); - printf(" wire %5d gobbl %5d\n", - vm_page_wire_count, vm_page_gobble_count); - db_indent -= 2; - iprintf("target:\n"); - db_indent += 2; - iprintf("min %5d inact %5d free %5d", - vm_page_free_min, vm_page_inactive_target, - vm_page_free_target); - printf(" resrv %5d\n", vm_page_free_reserved); - db_indent -= 2; - iprintf("pause:\n"); - db_pageout(); - db_indent -= 2; + if (!VM_CONFIG_COMPRESSOR_IS_ACTIVE) { + /* Available pages below our threshold */ + if (memorystatus_available_pages < memorystatus_available_pages_pressure) { + /* No frozen processes to kill */ + if (memorystatus_frozen_count == 0) { + /* Not enough suspended processes available. */ + if (memorystatus_suspended_count < MEMORYSTATUS_SUSPENDED_THRESHOLD) { + return TRUE; + } + } + } + return FALSE; + } else { + return (AVAILABLE_NON_COMPRESSED_MEMORY < VM_PAGE_COMPRESSOR_COMPACT_THRESHOLD) ? 1 : 0; + } } -#if MACH_COUNTERS -extern int c_laundry_pages_freed; -#endif /* MACH_COUNTERS */ +boolean_t +VM_PRESSURE_WARNING_TO_CRITICAL(void) +{ + if (!VM_CONFIG_COMPRESSOR_IS_ACTIVE) { + /* Available pages below our threshold */ + if (memorystatus_available_pages < memorystatus_available_pages_critical) { + return TRUE; + } + return FALSE; + } else { + return vm_compressor_low_on_space() || (AVAILABLE_NON_COMPRESSED_MEMORY < ((12 * VM_PAGE_COMPRESSOR_SWAP_UNTHROTTLE_THRESHOLD) / 10)) ? 1 : 0; + } +} -void -db_pageout(void) +/* + * Downward trajectory. + */ +boolean_t +VM_PRESSURE_WARNING_TO_NORMAL(void) { - iprintf("Pageout Statistics:\n"); - db_indent += 2; - iprintf("active %5d inactv %5d\n", - vm_pageout_active, vm_pageout_inactive); - iprintf("nolock %5d avoid %5d busy %5d absent %5d\n", - vm_pageout_inactive_nolock, vm_pageout_inactive_avoid, - vm_pageout_inactive_busy, vm_pageout_inactive_absent); - iprintf("used %5d clean %5d dirty %5d\n", - vm_pageout_inactive_used, vm_pageout_inactive_clean, - vm_pageout_inactive_dirty); -#if MACH_COUNTERS - iprintf("laundry_pages_freed %d\n", c_laundry_pages_freed); -#endif /* MACH_COUNTERS */ -#if MACH_CLUSTER_STATS - iprintf("Cluster Statistics:\n"); - db_indent += 2; - iprintf("dirtied %5d cleaned %5d collisions %5d\n", - vm_pageout_cluster_dirtied, vm_pageout_cluster_cleaned, - vm_pageout_cluster_collisions); - iprintf("clusters %5d conversions %5d\n", - vm_pageout_cluster_clusters, vm_pageout_cluster_conversions); - db_indent -= 2; - iprintf("Target Statistics:\n"); - db_indent += 2; - iprintf("collisions %5d page_dirtied %5d page_freed %5d\n", - vm_pageout_target_collisions, vm_pageout_target_page_dirtied, - vm_pageout_target_page_freed); - db_indent -= 2; -#endif /* MACH_CLUSTER_STATS */ - db_indent -= 2; + if (!VM_CONFIG_COMPRESSOR_IS_ACTIVE) { + /* Available pages above our threshold */ + unsigned int target_threshold = (unsigned int) (memorystatus_available_pages_pressure + ((15 * memorystatus_available_pages_pressure) / 100)); + if (memorystatus_available_pages > target_threshold) { + return TRUE; + } + return FALSE; + } else { + return (AVAILABLE_NON_COMPRESSED_MEMORY > ((12 * VM_PAGE_COMPRESSOR_COMPACT_THRESHOLD) / 10)) ? 1 : 0; + } } -#endif /* MACH_KDB */ +boolean_t +VM_PRESSURE_CRITICAL_TO_WARNING(void) +{ + if (!VM_CONFIG_COMPRESSOR_IS_ACTIVE) { + /* Available pages above our threshold */ + unsigned int target_threshold = (unsigned int)(memorystatus_available_pages_critical + ((15 * memorystatus_available_pages_critical) / 100)); + if (memorystatus_available_pages > target_threshold) { + return TRUE; + } + return FALSE; + } else { + return (AVAILABLE_NON_COMPRESSED_MEMORY > ((14 * VM_PAGE_COMPRESSOR_SWAP_UNTHROTTLE_THRESHOLD) / 10)) ? 1 : 0; + } +} +#endif /* VM_PRESSURE_EVENTS */