/*
- * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * 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
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * 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.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * 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_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
#include <mach/vm_map.h>
#include <mach/vm_param.h>
#include <mach/vm_statistics.h>
+#include <mach/sdt.h>
#include <kern/kern_types.h>
#include <kern/counters.h>
#include <machine/vm_tuning.h>
+#if CONFIG_EMBEDDED
+#include <sys/kern_memorystatus.h>
+#endif
+
#include <vm/pmap.h>
#include <vm/vm_fault.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/vm_protos.h> /* must be last */
+#include <vm/memory_object.h>
+#include <vm/vm_purgeable_internal.h>
/*
* ENCRYPTED SWAP:
*/
-#ifdef __ppc__
-#include <ppc/mappings.h>
-#endif /* __ppc__ */
#include <../bsd/crypto/aes/aes.h>
-extern ipc_port_t memory_manager_default;
-
-#ifndef VM_PAGEOUT_BURST_ACTIVE_THROTTLE
-#define VM_PAGEOUT_BURST_ACTIVE_THROTTLE 10000 /* maximum iterations of the active queue to move pages to inactive */
+#ifndef VM_PAGEOUT_BURST_ACTIVE_THROTTLE /* maximum iterations of the active queue to move pages to inactive */
+#ifdef CONFIG_EMBEDDED
+#define VM_PAGEOUT_BURST_ACTIVE_THROTTLE 2048
+#else
+#define VM_PAGEOUT_BURST_ACTIVE_THROTTLE 100
+#endif
#endif
-#ifndef VM_PAGEOUT_BURST_INACTIVE_THROTTLE
-#define VM_PAGEOUT_BURST_INACTIVE_THROTTLE 4096 /* maximum iterations of the inactive queue w/o stealing/cleaning a page */
+#ifndef VM_PAGEOUT_BURST_INACTIVE_THROTTLE /* maximum iterations of the inactive queue w/o stealing/cleaning a page */
+#ifdef CONFIG_EMBEDDED
+#define VM_PAGEOUT_BURST_INACTIVE_THROTTLE 1024
+#else
+#define VM_PAGEOUT_BURST_INACTIVE_THROTTLE 4096
+#endif
#endif
#ifndef VM_PAGEOUT_DEADLOCK_RELIEF
#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)
+#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
*/
#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)
+#endif
#endif /* VM_PAGE_FREE_TARGET */
/*
*/
#ifndef VM_PAGE_FREE_MIN
-#define VM_PAGE_FREE_MIN(free) (10 + (free) / 100)
+#ifdef CONFIG_EMBEDDED
+#define VM_PAGE_FREE_MIN(free) (10 + (free) / 200)
+#else
+#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
+
+
/*
* When vm_page_free_count falls below vm_page_free_reserved,
* only vm-privileged threads can allocate pages. vm-privilege
((6 * VM_PAGE_LAUNDRY_MAX) + (n))
#endif /* VM_PAGE_FREE_RESERVED */
+/*
+ * When we dequeue pages from the inactive list, they are
+ * reactivated (ie, put back on the active queue) if referenced.
+ * However, it is possible to starve the free list if other
+ * processors are referencing pages faster than we can turn off
+ * the referenced bit. So we limit the number of reactivations
+ * 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)
+#else
+#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
+
/*
* must hold the page queues lock to
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;
+
unsigned int vm_pageout_reserved_internal = 0;
unsigned int vm_pageout_reserved_really = 0;
* from existing backing store and files
*/
unsigned int vm_accellerate_zf_pageout_trigger = 400;
-unsigned int vm_zf_iterator;
-unsigned int vm_zf_iterator_count = 40;
-unsigned int last_page_zf;
+unsigned int zf_queue_min_count = 100;
unsigned int vm_zf_count = 0;
+unsigned int vm_zf_queue_count = 0;
/*
* These variables record the pageout daemon's actions:
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 long vm_page_encrypt_already_encrypted_counter = 0;
boolean_t vm_pages_encrypted = FALSE; /* are there encrypted pages ? */
-
struct vm_pageout_queue vm_pageout_queue_internal;
struct vm_pageout_queue vm_pageout_queue_external;
+unsigned int vm_page_speculative_target = 0;
+
+vm_object_t vm_pageout_scan_wants_object = VM_OBJECT_NULL;
+
+unsigned long vm_cs_validated_resets = 0;
/*
* Routine: vm_backing_store_disable
}
-/*
- * Routine: vm_pageout_object_allocate
- * Purpose:
- * Allocate an object for use as out-of-line memory in a
- * data_return/data_initialize message.
- * The page must be in an unlocked object.
- *
- * If the page belongs to a trusted pager, cleaning in place
- * will be used, which utilizes a special "pageout object"
- * containing private alias pages for the real page frames.
- * Untrusted pagers use normal out-of-line memory.
- */
-vm_object_t
-vm_pageout_object_allocate(
- vm_page_t m,
- vm_size_t size,
- vm_object_offset_t offset)
-{
- vm_object_t object = m->object;
- vm_object_t new_object;
-
- assert(object->pager_ready);
-
- new_object = vm_object_allocate(size);
-
- if (object->pager_trusted) {
- assert (offset < object->size);
-
- vm_object_lock(new_object);
- new_object->pageout = TRUE;
- new_object->shadow = object;
- new_object->can_persist = FALSE;
- new_object->copy_strategy = MEMORY_OBJECT_COPY_NONE;
- new_object->shadow_offset = offset;
- vm_object_unlock(new_object);
-
- /*
- * Take a paging reference on the object. This will be dropped
- * in vm_pageout_object_terminate()
- */
- vm_object_lock(object);
- vm_object_paging_begin(object);
- vm_page_lock_queues();
- vm_page_unlock_queues();
- vm_object_unlock(object);
-
- vm_pageout_in_place++;
- } else
- vm_pageout_out_of_line++;
- return(new_object);
-}
-
#if MACH_CLUSTER_STATS
unsigned long vm_pageout_cluster_dirtied = 0;
unsigned long vm_pageout_cluster_cleaned = 0;
/*
* Routine: vm_pageout_object_terminate
* Purpose:
- * Destroy the pageout_object allocated by
- * vm_pageout_object_allocate(), and perform all of the
+ * Destroy the pageout_object, and perform all of the
* required cleanup actions.
*
* In/Out conditions:
vm_object_t object)
{
vm_object_t shadow_object;
- boolean_t shadow_internal;
/*
* Deal with the deallocation (last reference) of a pageout object
assert(object->pageout);
shadow_object = object->shadow;
vm_object_lock(shadow_object);
- shadow_internal = shadow_object->internal;
while (!queue_empty(&object->memq)) {
vm_page_t p, m;
/* caller's page list indication */
m->dump_cleaning = FALSE;
- /*
- * Account for the paging reference taken when
- * m->cleaning was set on this page.
- */
- vm_object_paging_end(shadow_object);
assert((m->dirty) || (m->precious) ||
(m->busy && m->cleaning));
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++;
if (m->dirty) {
CLUSTER_STAT(vm_pageout_target_page_dirtied++;)
vm_page_unwire(m);/* reactivates */
- VM_STAT(reactivations++);
+ VM_STAT_INCR(reactivations);
PAGE_WAKEUP_DONE(m);
} else {
CLUSTER_STAT(vm_pageout_target_page_freed++;)
* If prep_pin_count is nonzero, then someone is using the
* page, so make it active.
*/
- if (!m->active && !m->inactive && !m->private) {
+ if (!m->active && !m->inactive && !m->throttled && !m->private) {
if (m->reference)
vm_page_activate(m);
else
/* will take care of resetting dirty. We clear the */
/* modify however for the Programmed I/O case. */
pmap_clear_modify(m->phys_page);
- if(m->absent) {
- m->absent = FALSE;
- if(shadow_object->absent_count == 1)
- vm_object_absent_release(shadow_object);
- else
- shadow_object->absent_count--;
- }
+
+ m->absent = FALSE;
m->overwriting = FALSE;
} else if (m->overwriting) {
/* alternate request page list, write to page_list */
#endif
}
m->cleaning = FALSE;
+ m->encrypted_cleaning = FALSE;
/*
* Wakeup any thread waiting for the page to be un-cleaning.
return;
}
-/*
- * Routine: vm_pageout_setup
- * Purpose:
- * Set up a page for pageout (clean & flush).
- *
- * Move the page to a new object, as part of which it will be
- * sent to its memory manager in a memory_object_data_write or
- * memory_object_initialize message.
- *
- * The "new_object" and "new_offset" arguments
- * indicate where the page should be moved.
- *
- * In/Out conditions:
- * The page in question must not be on any pageout queues,
- * and must be busy. The object to which it belongs
- * must be unlocked, and the caller must hold a paging
- * reference to it. The new_object must not be locked.
- *
- * This routine returns a pointer to a place-holder page,
- * inserted at the same offset, to block out-of-order
- * requests for the page. The place-holder page must
- * be freed after the data_write or initialize message
- * has been sent.
- *
- * The original page is put on a paging queue and marked
- * not busy on exit.
- */
-vm_page_t
-vm_pageout_setup(
- register vm_page_t m,
- register vm_object_t new_object,
- vm_object_offset_t new_offset)
-{
- register vm_object_t old_object = m->object;
- vm_object_offset_t paging_offset;
- vm_object_offset_t offset;
- register vm_page_t holding_page;
- register vm_page_t new_m;
- boolean_t need_to_wire = FALSE;
-
-
- XPR(XPR_VM_PAGEOUT,
- "vm_pageout_setup, obj 0x%X off 0x%X page 0x%X new obj 0x%X offset 0x%X\n",
- (integer_t)m->object, (integer_t)m->offset,
- (integer_t)m, (integer_t)new_object,
- (integer_t)new_offset);
- assert(m && m->busy && !m->absent && !m->fictitious && !m->error &&
- !m->restart);
-
- assert(m->dirty || m->precious);
-
- /*
- * Create a place-holder page where the old one was, to prevent
- * attempted pageins of this page while we're unlocked.
- */
- VM_PAGE_GRAB_FICTITIOUS(holding_page);
-
- vm_object_lock(old_object);
-
- offset = m->offset;
- paging_offset = offset + old_object->paging_offset;
-
- if (old_object->pager_trusted) {
- /*
- * This pager is trusted, so we can clean this page
- * in place. Leave it in the old object, and mark it
- * cleaning & pageout.
- */
- new_m = holding_page;
- holding_page = VM_PAGE_NULL;
-
- /*
- * Set up new page to be private shadow of real page.
- */
- new_m->phys_page = m->phys_page;
- new_m->fictitious = FALSE;
- new_m->pageout = TRUE;
-
- /*
- * Mark real page as cleaning (indicating that we hold a
- * paging reference to be released via m_o_d_r_c) and
- * pageout (indicating that the page should be freed
- * when the pageout completes).
- */
- pmap_clear_modify(m->phys_page);
- vm_page_lock_queues();
- new_m->private = TRUE;
- vm_page_wire(new_m);
- m->cleaning = TRUE;
- m->pageout = TRUE;
-
- vm_page_wire(m);
- assert(m->wire_count == 1);
- vm_page_unlock_queues();
-
- m->dirty = TRUE;
- m->precious = FALSE;
- m->page_lock = VM_PROT_NONE;
- m->unusual = FALSE;
- m->unlock_request = VM_PROT_NONE;
- } else {
- /*
- * Cannot clean in place, so rip the old page out of the
- * object, and stick the holding page in. Set new_m to the
- * page in the new object.
- */
- vm_page_lock_queues();
- VM_PAGE_QUEUES_REMOVE(m);
- vm_page_remove(m);
-
- vm_page_insert(holding_page, old_object, offset);
- vm_page_unlock_queues();
-
- m->dirty = TRUE;
- m->precious = FALSE;
- new_m = m;
- new_m->page_lock = VM_PROT_NONE;
- new_m->unlock_request = VM_PROT_NONE;
-
- if (old_object->internal)
- need_to_wire = TRUE;
- }
- /*
- * Record that this page has been written out
- */
-#if MACH_PAGEMAP
- vm_external_state_set(old_object->existence_map, offset);
-#endif /* MACH_PAGEMAP */
-
- vm_object_unlock(old_object);
-
- vm_object_lock(new_object);
-
- /*
- * Put the page into the new object. If it is a not wired
- * (if it's the real page) it will be activated.
- */
-
- vm_page_lock_queues();
- vm_page_insert(new_m, new_object, new_offset);
- if (need_to_wire)
- vm_page_wire(new_m);
- else
- vm_page_activate(new_m);
- PAGE_WAKEUP_DONE(new_m);
- vm_page_unlock_queues();
-
- vm_object_unlock(new_object);
-
- /*
- * Return the placeholder page to simplify cleanup.
- */
- return (holding_page);
-}
-
/*
* Routine: vm_pageclean_setup
*
vm_object_t new_object,
vm_object_offset_t new_offset)
{
- vm_object_t old_object = m->object;
assert(!m->busy);
+#if 0
assert(!m->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",
- (integer_t)old_object, m->offset, (integer_t)m,
+ (integer_t)m->object, m->offset, (integer_t)m,
(integer_t)new_m, new_offset);
pmap_clear_modify(m->phys_page);
- vm_object_paging_begin(old_object);
-
- /*
- * Record that this page has been written out
- */
-#if MACH_PAGEMAP
- vm_external_state_set(old_object->existence_map, m->offset);
-#endif /*MACH_PAGEMAP*/
/*
* Mark original page as cleaning in place.
* 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->busy = FALSE;
}
-void
-vm_pageclean_copy(
- vm_page_t m,
- vm_page_t new_m,
- vm_object_t new_object,
- vm_object_offset_t new_offset)
-{
- XPR(XPR_VM_PAGEOUT,
- "vm_pageclean_copy, page 0x%X new_m 0x%X new_obj 0x%X offset 0x%X\n",
- m, new_m, new_object, new_offset, 0);
-
- assert((!m->busy) && (!m->cleaning));
-
- assert(!new_m->private && !new_m->fictitious);
-
- pmap_clear_modify(m->phys_page);
-
- m->busy = TRUE;
- vm_object_paging_begin(m->object);
- vm_page_unlock_queues();
- vm_object_unlock(m->object);
-
- /*
- * Copy the original page to the new page.
- */
- vm_page_copy(m, new_m);
-
- /*
- * Mark the old page as clean. A request to pmap_is_modified
- * will get the right answer.
- */
- vm_object_lock(m->object);
- m->dirty = FALSE;
-
- vm_object_paging_end(m->object);
-
- vm_page_lock_queues();
- if (!m->active && !m->inactive)
- vm_page_activate(m);
- PAGE_WAKEUP_DONE(m);
-
- vm_page_insert(new_m, new_object, new_offset);
- vm_page_activate(new_m);
- new_m->busy = FALSE; /* No other thread can be waiting */
-}
-
-
/*
* Routine: vm_pageout_initialize_page
* Purpose:
vm_object_t object;
vm_object_offset_t paging_offset;
vm_page_t holding_page;
-
+ memory_object_t pager;
XPR(XPR_VM_PAGEOUT,
"vm_pageout_initialize_page, page 0x%X\n",
*/
object = m->object;
paging_offset = m->offset + object->paging_offset;
- vm_object_paging_begin(object);
- if (m->absent || m->error || m->restart ||
- (!m->dirty && !m->precious)) {
+
+ if (m->absent || m->error || m->restart || (!m->dirty && !m->precious)) {
VM_PAGE_FREE(m);
panic("reservation without pageout?"); /* alan */
- vm_object_unlock(object);
+ vm_object_unlock(object);
+
+ return;
+ }
+
+ /*
+ * 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.
+ */
+
+ pager = object->pager;
+
+ if (pager == MEMORY_OBJECT_NULL) {
+ VM_PAGE_FREE(m);
+ panic("missing pager for copy object");
return;
}
/* set the page for future call to vm_fault_list_request */
+ vm_object_paging_begin(object);
holding_page = NULL;
vm_page_lock_queues();
pmap_clear_modify(m->phys_page);
* [The object reference from its allocation is donated
* to the eventual recipient.]
*/
- memory_object_data_initialize(object->pager,
- paging_offset,
- PAGE_SIZE);
+ memory_object_data_initialize(pager, paging_offset, PAGE_SIZE);
vm_object_lock(object);
+ vm_object_paging_end(object);
}
#if MACH_CLUSTER_STATS
} cluster_stats[MAXCLUSTERPAGES];
#endif /* MACH_CLUSTER_STATS */
-boolean_t allow_clustered_pageouts = FALSE;
/*
* vm_pageout_cluster:
*/
assert(m->busy && (m->dirty || m->precious) && (m->wire_count == 0));
assert(!m->cleaning && !m->pageout && !m->inactive && !m->active);
+ assert(!m->throttled);
/*
* protect the object from collapse -
* vm_page_free_wanted == 0.
*/
-#define DELAYED_UNLOCK_LIMIT (3 * MAX_UPL_TRANSFER)
+#define VM_PAGEOUT_DELAYED_UNLOCK_LIMIT (3 * MAX_UPL_TRANSFER)
#define FCS_IDLE 0
#define FCS_DELAYED 1
mach_timespec_t ts;
};
-extern kern_return_t sysclk_gettime(mach_timespec_t *);
-
-
void
vm_pageout_scan(void)
{
unsigned int loop_count = 0;
unsigned int inactive_burst_count = 0;
unsigned int active_burst_count = 0;
- vm_page_t local_freeq = 0;
+ unsigned int reactivated_this_call;
+ unsigned int reactivate_limit;
+ vm_page_t local_freeq = NULL;
int local_freed = 0;
- int delayed_unlock = 0;
+ int delayed_unlock;
int need_internal_inactive = 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;
- boolean_t active_throttled = FALSE;
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;
+ int zf_ratio;
+ int zf_run_count;
+ uint32_t catch_up_count = 0;
+ uint32_t inactive_reclaim_run;
+ boolean_t forced_reclaim;
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];
+
XPR(XPR_VM_PAGEOUT, "vm_pageout_scan\n", 0, 0, 0, 0, 0);
+
+ 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;
+
+
/*???*/ /*
* We want to gradually dribble pages from the active queue
* to the inactive queue. If we let the inactive queue get
* aren't vm-privileged. If we kept sending dirty pages to them,
* we could exhaust the free list.
*/
- vm_page_lock_queues();
- delayed_unlock = 1;
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.
+ */
+ {
+ uint32_t total = vm_page_active_count + vm_page_inactive_count;
+ uint32_t normal = total - vm_zf_count;
+
+ /* 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);
- object = NULL;
+ 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;
- if (delayed_unlock == 0)
- vm_page_lock_queues();
+ DTRACE_VM2(rev, int, 1, (uint64_t *), NULL);
- active_burst_count = vm_page_active_count;
+ if (delayed_unlock == 0) {
+ vm_page_lock_queues();
+ delayed_unlock = 1;
+ }
- if (active_burst_count > vm_pageout_burst_active_throttle)
- active_burst_count = vm_pageout_burst_active_throttle;
+ /*
+ * Don't sweep through active queue more than the throttle
+ * which should be kept relatively low
+ */
+ active_burst_count = vm_pageout_burst_active_throttle;
/*
* Move pages from active to inactive.
*/
- while ((need_internal_inactive ||
- vm_page_inactive_count < vm_page_inactive_target) &&
- !queue_empty(&vm_page_queue_active) &&
- ((active_burst_count--) > 0)) {
+ if (need_internal_inactive == 0 && (vm_page_inactive_count + vm_page_speculative_count) >= vm_page_inactive_target)
+ goto done_moving_active_pages;
+
+ while (!queue_empty(&vm_page_queue_active) &&
+ (need_internal_inactive || active_burst_count)) {
+
+ if (active_burst_count)
+ active_burst_count--;
vm_pageout_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);
/*
* Try to lock object; since we've already got the
if (object != NULL) {
vm_object_unlock(object);
object = NULL;
+ vm_pageout_scan_wants_object = VM_OBJECT_NULL;
}
- if (!vm_object_lock_try(m->object)) {
+ if (!vm_object_lock_try_scan(m->object)) {
/*
* move page to end of active queue and continue
*/
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 its 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.
goto done_with_activepage;
}
- if (need_internal_inactive) {
- /*
- * If we're unable to make forward progress
- * with the current set of pages on the
- * inactive queue due to busy objects or
- * throttled pageout queues, then
- * move a page that is already clean
- * or belongs to a pageout queue that
- * isn't currently throttled
- */
- active_throttled = FALSE;
- if (object->internal) {
- if ((VM_PAGE_Q_THROTTLED(iq) || !IP_VALID(memory_manager_default)))
- active_throttled = TRUE;
- } else if (VM_PAGE_Q_THROTTLED(eq)) {
- active_throttled = TRUE;
- }
- if (active_throttled == TRUE) {
- if (!m->dirty) {
- 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->dirty || m->precious) {
- /*
- * page is dirty and targets a THROTTLED queue
- * so all we can do is move it back to the
- * end of the active queue to get it out
- * of the way
- */
- queue_remove(&vm_page_queue_active, m,
- vm_page_t, pageq);
- queue_enter(&vm_page_queue_active, m,
- vm_page_t, pageq);
-
- vm_pageout_scan_active_throttled++;
-
- goto done_with_activepage;
- }
- }
- vm_pageout_scan_active_throttle_success++;
- need_internal_inactive--;
- }
/*
* Deactivate the page while holding the object
* locked, so we know the page is still not busy.
* can handle that.
*/
vm_page_deactivate(m);
+
+ if (need_internal_inactive) {
+ vm_pageout_scan_active_throttle_success++;
+ need_internal_inactive--;
+ }
done_with_activepage:
- if (delayed_unlock++ > DELAYED_UNLOCK_LIMIT) {
+ if (delayed_unlock++ > VM_PAGEOUT_DELAYED_UNLOCK_LIMIT || try_failed == TRUE) {
if (object != NULL) {
vm_object_unlock(object);
object = NULL;
+ vm_pageout_scan_wants_object = VM_OBJECT_NULL;
}
if (local_freeq) {
vm_page_free_list(local_freeq);
- local_freeq = 0;
+ local_freeq = NULL;
local_freed = 0;
}
- delayed_unlock = 0;
- vm_page_unlock_queues();
+ mutex_yield(&vm_page_queue_lock);
+
+ delayed_unlock = 1;
- mutex_pause();
- vm_page_lock_queues();
/*
* continue the while loop processing
* the active queue... need to hold
* the page queues lock
*/
- continue;
}
}
* and the inactive queue
**********************************************************************/
-
+done_moving_active_pages:
/*
* We are done if we have met our target *and*
vm_object_unlock(object);
object = NULL;
}
+ vm_pageout_scan_wants_object = VM_OBJECT_NULL;
+
if (local_freeq) {
vm_page_free_list(local_freeq);
- local_freeq = 0;
+ local_freeq = NULL;
local_freed = 0;
}
+ /*
+ * inactive target still not met... keep going
+ * until we get the queues balanced
+ */
+ if (((vm_page_inactive_count + vm_page_speculative_count) < vm_page_inactive_target) &&
+ !queue_empty(&vm_page_queue_active))
+ continue;
+
mutex_lock(&vm_page_queue_free_lock);
if ((vm_page_free_count >= vm_page_free_target) &&
- (vm_page_free_wanted == 0)) {
+ (vm_page_free_wanted == 0) && (vm_page_free_wanted_privileged == 0)) {
vm_page_unlock_queues();
thread_wakeup((event_t) &vm_pageout_garbage_collect);
+
+ assert(vm_pageout_scan_wants_object == VM_OBJECT_NULL);
+
return;
}
mutex_unlock(&vm_page_queue_free_lock);
}
+ /*
+ * Before anything, we check if we have any ripe volatile objects around.
+ * If so, purge the first and see what it gives us.
+ */
+ assert (available_for_purge>=0);
+ if (available_for_purge)
+ {
+ if (object != NULL) {
+ vm_object_unlock(object);
+ object = NULL;
+ }
+ vm_purgeable_object_purge_one();
+ continue;
+ }
+
+ 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;
+
+ aq = &vm_page_queue_speculative[speculative_steal_index];
+
+ while (queue_empty(&aq->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 (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);
+
+ clock_get_system_nanotime(&ts.tv_sec, (unsigned *)&ts.tv_nsec);
+
+ if (CMP_MACH_TIMESPEC(&ts, &ts_fully_aged) >= 0)
+ can_steal = TRUE;
+ }
+ if (can_steal == TRUE)
+ vm_page_speculate_ageit(aq);
+ }
/*
* Sometimes we have to pause:
* 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))) {
+ 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;
msecs = vm_pageout_burst_wait;
goto vm_pageout_scan_delay;
- } else if (VM_PAGE_Q_THROTTLED(iq)) {
+ } else if (VM_PAGE_Q_THROTTLED(iq) && IP_VALID(memory_manager_default)) {
switch (flow_control.state) {
reset_deadlock_timer:
ts.tv_sec = vm_pageout_deadlock_wait / 1000;
ts.tv_nsec = (vm_pageout_deadlock_wait % 1000) * 1000 * NSEC_PER_USEC;
- sysclk_gettime(&flow_control.ts);
+ clock_get_system_nanotime(&flow_control.ts.tv_sec,
+ (unsigned *)&flow_control.ts.tv_nsec);
ADD_MACH_TIMESPEC(&flow_control.ts, &ts);
flow_control.state = FCS_DELAYED;
break;
case FCS_DELAYED:
- sysclk_gettime(&ts);
+ clock_get_system_nanotime(&ts.tv_sec,
+ (unsigned *)&ts.tv_nsec);
if (CMP_MACH_TIMESPEC(&ts, &flow_control.ts) >= 0) {
/*
* 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 pagings and allow the system to run to see what
+ * 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_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;
vm_object_unlock(object);
object = NULL;
}
+ vm_pageout_scan_wants_object = VM_OBJECT_NULL;
+
if (local_freeq) {
vm_page_free_list(local_freeq);
- local_freeq = 0;
+ local_freeq = NULL;
local_freed = 0;
}
+#if CONFIG_EMBEDDED
+ {
+ int percent_avail;
+
+ /*
+ * 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 +
+ 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);
+ }
+ }
+#endif
assert_wait_timeout((event_t) &iq->pgo_laundry, THREAD_INTERRUPTIBLE, msecs, 1000*NSEC_PER_USEC);
counter(c_vm_pageout_scan_block++);
vm_page_unlock_queues();
+
+ assert(vm_pageout_scan_wants_object == VM_OBJECT_NULL);
thread_block(THREAD_CONTINUE_NULL);
iq->pgo_throttled = FALSE;
- if (loop_count >= vm_page_inactive_count) {
- if (VM_PAGE_Q_THROTTLED(eq) || VM_PAGE_Q_THROTTLED(iq)) {
- /*
- * Make sure we move enough "appropriate"
- * pages to the inactive queue before trying
- * again.
- */
- need_internal_inactive = vm_pageout_inactive_relief;
- }
+ if (loop_count >= vm_page_inactive_count)
loop_count = 0;
- }
inactive_burst_count = 0;
goto Restart;
inactive_burst_count++;
vm_pageout_inactive++;
- if (!queue_empty(&vm_page_queue_inactive)) {
- m = (vm_page_t) queue_first(&vm_page_queue_inactive);
+ /* Choose a victim. */
+
+ while (1) {
+ m = NULL;
- if (m->clustered && (m->no_isync == TRUE)) {
- goto use_this_page;
+ /*
+ * the most eligible pages are ones that were throttled because the
+ * pager wasn't ready at the time. If a pager is ready now,
+ * see if one of these is useful.
+ */
+ if (!VM_PAGE_Q_THROTTLED(iq) && !queue_empty(&vm_page_queue_throttled)) {
+ m = (vm_page_t) queue_first(&vm_page_queue_throttled);
+ break;
}
- }
- if (vm_zf_count < vm_accellerate_zf_pageout_trigger) {
- vm_zf_iterator = 0;
- } else {
- last_page_zf = 0;
- if((vm_zf_iterator+=1) >= vm_zf_iterator_count) {
- vm_zf_iterator = 0;
+
+ /*
+ * The second 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");
}
- if (queue_empty(&vm_page_queue_zf) ||
- (((last_page_zf) || (vm_zf_iterator == 0)) &&
- !queue_empty(&vm_page_queue_inactive))) {
- m = (vm_page_t) queue_first(&vm_page_queue_inactive);
- last_page_zf = 0;
- } else {
- m = (vm_page_t) queue_first(&vm_page_queue_zf);
- last_page_zf = 1;
- }
-use_this_page:
- assert(!m->active && m->inactive);
+
+ 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);
+
+ DTRACE_VM2(scan, int, 1, (uint64_t *), 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
+ * 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
+ * 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 (!vm_object_lock_try(m->object)) {
+ /*
+ * 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)) {
/*
* Move page to end and continue.
* Don't re-issue ticket
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 tail 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(&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(1);
+
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;
+
vm_pageout_inactive_nolock++;
+ 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);
+ }
+ /*
+ * 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
*/
- delayed_unlock = DELAYED_UNLOCK_LIMIT + 1;
+ try_failed = TRUE;
goto done_with_inactivepage;
}
object = m->object;
- }
- /*
- * If the page belongs to a purgable object with no pending copies
- * against it, then we reap all of the pages in the object
- * and note that the object has been "emptied". It'll be up to the
- * application the discover this and recreate its contents if desired.
- */
- if ((object->purgable == VM_OBJECT_PURGABLE_VOLATILE ||
- object->purgable == VM_OBJECT_PURGABLE_EMPTY) &&
- object->copy == VM_OBJECT_NULL) {
-
- (void) vm_object_purge(object);
- vm_pageout_purged_objects++;
- /*
- * we've just taken all of the pages from this object,
- * so drop the lock now since we're not going to find
- * any more pages belonging to it anytime soon
- */
- vm_object_unlock(object);
- object = NULL;
-
- inactive_burst_count = 0;
+ vm_pageout_scan_wants_object = VM_OBJECT_NULL;
- goto done_with_inactivepage;
+ try_failed = FALSE;
}
/*
* pulled from the queue and paged out whenever
* one of its logically adjacent fellows is
* targeted.
+ *
+ * Pages found on the speculative list can never be
+ * in this state... they always have a pager associated
+ * with them.
*/
+ assert(!m->speculative);
+
if (m->zero_fill) {
queue_remove(&vm_page_queue_zf, m,
vm_page_t, pageq);
queue_enter(&vm_page_queue_zf, m,
vm_page_t, pageq);
- last_page_zf = 1;
- vm_zf_iterator = vm_zf_iterator_count - 1;
} 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(1);
+
queue_enter(&vm_page_queue_inactive, m,
vm_page_t, pageq);
- last_page_zf = 0;
- vm_zf_iterator = 1;
+#if MACH_ASSERT
+ vm_page_inactive_count++; /* balance for purgeable queue asserts */
+#endif
+ token_new_pagecount++;
}
vm_pageout_inactive_avoid++;
goto done_with_inactivepage;
}
/*
- * Remove the page from the inactive list.
+ * Remove the page from its list.
*/
- if (m->zero_fill) {
- queue_remove(&vm_page_queue_zf, m, vm_page_t, pageq);
+ if (m->speculative) {
+ remque(&m->pageq);
+ m->speculative = FALSE;
+ vm_page_speculative_count--;
+ } else if (m->throttled) {
+ queue_remove(&vm_page_queue_throttled, m, vm_page_t, pageq);
+ m->throttled = FALSE;
+ vm_page_throttled_count--;
} else {
- queue_remove(&vm_page_queue_inactive, m, vm_page_t, pageq);
+ if (m->zero_fill) {
+ queue_remove(&vm_page_queue_zf, m, vm_page_t, pageq);
+ vm_zf_queue_count--;
+ } else {
+ queue_remove(&vm_page_queue_inactive, m, vm_page_t, pageq);
+ }
+ m->inactive = FALSE;
+ if (!m->fictitious)
+ vm_page_inactive_count--;
+ vm_purgeable_q_advance_all(1);
+ }
+
+ /* 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->cleaning) {
+ 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(m->wire_count == 0);
+ /* just stick it back on! */
+ goto reactivate_page;
+ }
}
m->pageq.next = NULL;
m->pageq.prev = NULL;
- m->inactive = FALSE;
- if (!m->fictitious)
- vm_page_inactive_count--;
- if (m->busy || !object->alive) {
+ if ( !m->fictitious && catch_up_count)
+ catch_up_count--;
+
+ /*
+ * 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)) {
/*
* Somebody is already playing with this page.
* Leave it off the pageout queues.
+ *
*/
vm_pageout_inactive_busy++;
vm_pageout_scan_inactive_throttle_success++;
vm_pageout_deadlock_target--;
}
- if (m->tabled)
- vm_page_remove(m); /* clears tabled, object, offset */
- if (m->absent)
- vm_object_absent_release(object);
+
+ DTRACE_VM2(dfree, int, 1, (uint64_t *), NULL);
+
+ if (m->object->internal) {
+ DTRACE_VM2(anonfree, int, 1, (uint64_t *), NULL);
+ } else {
+ DTRACE_VM2(fsfree, int, 1, (uint64_t *), NULL);
+ }
+
+ vm_page_free_prepare(m);
assert(m->pageq.next == NULL &&
m->pageq.prev == NULL);
/*
* 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.
*/
- if ( (!m->reference) ) {
+ refmod_state = -1;
+
+ if (m->reference == FALSE && m->pmapped == TRUE) {
refmod_state = pmap_get_refmod(m->phys_page);
if (refmod_state & VM_MEM_REFERENCED)
if (refmod_state & VM_MEM_MODIFIED)
m->dirty = TRUE;
}
- if (m->reference) {
-was_referenced:
- vm_page_activate(m);
- VM_STAT(reactivations++);
+ 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 {
+ /*
+ * The page was being used, so put back on active list.
+ */
+reactivate_page:
+ vm_page_activate(m);
+ VM_STAT_INCR(reactivations);
- vm_pageout_inactive_used++;
- last_page_zf = 0;
- inactive_burst_count = 0;
+ vm_pageout_inactive_used++;
+ inactive_burst_count = 0;
- goto done_with_inactivepage;
+ 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,
* 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 which means we did a pmap_get_refmod
- * and updated both m->reference and m->dirty
+ * 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
if (m->dirty || m->precious) {
if (object->internal) {
- if ((VM_PAGE_Q_THROTTLED(iq) || !IP_VALID(memory_manager_default)))
+ if (VM_PAGE_Q_THROTTLED(iq))
inactive_throttled = TRUE;
} else if (VM_PAGE_Q_THROTTLED(eq)) {
- inactive_throttled = TRUE;
+ inactive_throttled = TRUE;
}
}
if (inactive_throttled == TRUE) {
- if (m->zero_fill) {
- queue_enter(&vm_page_queue_zf, m,
+throttle_inactive:
+ if (!IP_VALID(memory_manager_default) &&
+ object->internal &&
+ (object->purgable == VM_PURGABLE_DENY ||
+ object->purgable == VM_PURGABLE_NONVOLATILE)) {
+ queue_enter(&vm_page_queue_throttled, m,
vm_page_t, pageq);
+ m->throttled = TRUE;
+ vm_page_throttled_count++;
} else {
- queue_enter(&vm_page_queue_inactive, m,
- vm_page_t, pageq);
+ 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++;
+ }
}
- if (!m->fictitious)
- vm_page_inactive_count++;
- m->inactive = TRUE;
-
vm_pageout_scan_inactive_throttled++;
-
goto done_with_inactivepage;
}
+
/*
* we've got a page that we can steal...
* eliminate all mappings and make sure
* since we already set m->busy = TRUE, before
* going off to reactivate it
*
- * if we don't need the pmap_disconnect, then
- * m->dirty is up to date courtesy of the
- * earlier check for m->reference... if
- * we get here, then m->reference had to be
- * FALSE which means we did a pmap_get_refmod
- * and updated both m->reference and m->dirty...
+ * 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->no_isync == FALSE) {
+ 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) {
- m->reference = TRUE;
-
- PAGE_WAKEUP_DONE(m);
- goto was_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;
+
/*
* If it's clean and not precious, we can free the page.
*/
vm_pageout_inactive_clean++;
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.
+ */
+ {
+ 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;
+ }
+
+ if (disconnect_throttled == TRUE) {
+ PAGE_WAKEUP_DONE(m);
+ goto throttle_inactive;
+ }
+ }
+
vm_pageout_cluster(m);
vm_pageout_inactive_dirty++;
inactive_burst_count = 0;
done_with_inactivepage:
- if (delayed_unlock++ > DELAYED_UNLOCK_LIMIT) {
+ if (delayed_unlock++ > VM_PAGEOUT_DELAYED_UNLOCK_LIMIT || try_failed == TRUE) {
if (object != NULL) {
vm_object_unlock(object);
object = NULL;
+ vm_pageout_scan_wants_object = VM_OBJECT_NULL;
}
if (local_freeq) {
vm_page_free_list(local_freeq);
- local_freeq = 0;
+ local_freeq = NULL;
local_freed = 0;
}
- delayed_unlock = 0;
- vm_page_unlock_queues();
- mutex_pause();
+ mutex_yield(&vm_page_queue_lock);
+
+ delayed_unlock = 1;
}
/*
* back to top of pageout scan loop
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;
+
}
/*
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);
mutex_unlock(&vm_page_queue_free_lock);
vm_page_t m = NULL;
vm_object_t object;
boolean_t need_wakeup;
+ memory_object_t pager;
+ thread_t self = current_thread();
- vm_page_lock_queues();
+ if ((vm_pageout_internal_iothread != THREAD_NULL)
+ && (self == vm_pageout_external_iothread )
+ && (self->options & TH_OPT_VMPRIV))
+ self->options &= ~TH_OPT_VMPRIV;
+
+ vm_page_lockspin_queues();
while ( !queue_empty(&q->pgo_pending) ) {
#endif
object = m->object;
+ vm_object_lock(object);
+
if (!object->pager_initialized) {
- vm_object_lock(object);
/*
* If there is no memory object for the page, create
*/
if (!object->pager_initialized)
- vm_object_collapse(object, (vm_object_offset_t)0);
+ vm_object_collapse(object,
+ (vm_object_offset_t) 0,
+ TRUE);
if (!object->pager_initialized)
vm_object_pager_create(object);
if (!object->pager_initialized) {
m->list_req_pending = FALSE;
m->cleaning = FALSE;
m->pageout = FALSE;
- vm_page_unwire(m);
+ vm_page_lockspin_queues();
+ vm_page_unwire(m);
vm_pageout_throttle_up(m);
-
- vm_page_lock_queues();
vm_pageout_dirty_no_pager++;
vm_page_activate(m);
vm_page_unlock_queues();
vm_object_paging_end(object);
vm_object_unlock(object);
- vm_page_lock_queues();
+ vm_page_lockspin_queues();
continue;
- } else if (object->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);
+ }
+ }
+ 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_object_paging_end(object);
- vm_object_unlock(object);
+ VM_PAGE_FREE(m);
- vm_page_lock_queues();
- continue;
- }
+ vm_object_paging_end(object);
vm_object_unlock(object);
+
+ vm_page_lockspin_queues();
+ continue;
}
+ vm_object_unlock(object);
/*
* we expect the paging_in_progress reference to have
* already been taken on the object before it was added
* Send the data to the pager.
* any pageout clustering happens there
*/
- memory_object_data_return(object->pager,
+ memory_object_data_return(pager,
m->offset + object->paging_offset,
PAGE_SIZE,
NULL,
vm_object_paging_end(object);
vm_object_unlock(object);
- vm_page_lock_queues();
+ vm_page_lockspin_queues();
}
assert_wait((event_t) q, THREAD_UNINT);
static void
vm_pageout_iothread_external(void)
{
+ thread_t self = current_thread();
+
+ self->options |= TH_OPT_VMPRIV;
vm_pageout_iothread_continue(&vm_pageout_queue_external);
/*NOTREACHED*/
self->priority = BASEPRI_PREEMPT - 1;
set_sched_pri(self, self->priority);
thread_unlock(self);
+
+ if (!self->reserved_stack)
+ self->reserved_stack = self->kernel_stack;
+
splx(s);
/*
task_unlock(kernel_task);
vm_page_free_count_init = vm_page_free_count;
- vm_zf_iterator = 0;
+
/*
* even if we've already called vm_page_free_reserve
* call it again here to insure that the targets are
vm_pageout_queue_external.pgo_throttled = FALSE;
queue_init(&vm_pageout_queue_internal.pgo_pending);
- vm_pageout_queue_internal.pgo_maxlaundry = VM_PAGE_LAUNDRY_MAX;
+ 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;
- result = kernel_thread_start_priority((thread_continue_t)vm_pageout_iothread_internal, NULL, BASEPRI_PREEMPT - 1, &thread);
- if (result != KERN_SUCCESS)
- panic("vm_pageout_iothread_internal: create failed");
-
- thread_deallocate(thread);
-
+ /* 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_PREEMPT - 1, &thread);
+ 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");
- thread_deallocate(thread);
-
+ thread_deallocate(vm_pageout_external_iothread);
- result = kernel_thread_start_priority((thread_continue_t)vm_pageout_garbage_collect, NULL, BASEPRI_PREEMPT - 2, &thread);
+ 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");
thread_deallocate(thread);
+ vm_object_reaper_init();
+
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;
+
+ 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;
+}
+
+#define UPL_DELAYED_UNLOCK_LIMIT (MAX_UPL_TRANSFER / 2)
static upl_t
-upl_create(
- int flags,
- upl_size_t size)
+upl_create(int type, int flags, upl_size_t size)
{
upl_t upl;
- int page_field_size; /* bit field in word size buf */
+ int page_field_size = 0;
+ int upl_flags = 0;
+ int upl_size = sizeof(struct upl);
- page_field_size = 0;
- if (flags & UPL_CREATE_LITE) {
+ if (type & UPL_CREATE_LITE) {
page_field_size = ((size/PAGE_SIZE) + 7) >> 3;
page_field_size = (page_field_size + 3) & 0xFFFFFFFC;
+
+ upl_flags |= UPL_LITE;
}
- if(flags & UPL_CREATE_INTERNAL) {
- upl = (upl_t)kalloc(sizeof(struct upl)
- + (sizeof(struct upl_page_info)*(size/PAGE_SIZE))
- + page_field_size);
- } else {
- upl = (upl_t)kalloc(sizeof(struct upl) + page_field_size);
+ if (type & UPL_CREATE_INTERNAL) {
+ upl_size += sizeof(struct upl_page_info) * (size/PAGE_SIZE);
+
+ upl_flags |= UPL_INTERNAL;
}
- upl->flags = 0;
+ 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);
#ifdef UPL_DEBUG
upl->ubc_alias1 = 0;
}
static void
-upl_destroy(
- upl_t upl)
+upl_destroy(upl_t upl)
{
int page_field_size; /* bit field in word size buf */
+ int size;
#ifdef UPL_DEBUG
{
- upl_t upl_ele;
vm_object_t object;
- if (upl->map_object->pageout) {
+
+ if (upl->flags & UPL_SHADOWED) {
object = upl->map_object->shadow;
} else {
object = upl->map_object;
}
vm_object_lock(object);
- queue_iterate(&object->uplq, upl_ele, upl_t, uplq) {
- if(upl_ele == upl) {
- queue_remove(&object->uplq,
- upl_ele, upl_t, uplq);
- break;
- }
- }
+ queue_remove(&object->uplq, upl, upl_t, uplq);
vm_object_unlock(object);
}
#endif /* UPL_DEBUG */
- /* drop a reference on the map_object whether or */
- /* not a pageout object is inserted */
- if(upl->map_object->pageout)
+ /*
+ * 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->size;
page_field_size = 0;
+
if (upl->flags & UPL_LITE) {
- page_field_size = ((upl->size/PAGE_SIZE) + 7) >> 3;
+ page_field_size = ((size/PAGE_SIZE) + 7) >> 3;
page_field_size = (page_field_size + 3) & 0xFFFFFFFC;
}
- if(upl->flags & UPL_INTERNAL) {
+ if (upl->flags & UPL_INTERNAL) {
kfree(upl,
sizeof(struct upl) +
- (sizeof(struct upl_page_info) * (upl->size/PAGE_SIZE))
+ (sizeof(struct upl_page_info) * (size/PAGE_SIZE))
+ page_field_size);
} else {
kfree(upl, sizeof(struct upl) + page_field_size);
void uc_upl_dealloc(upl_t upl);
__private_extern__ void
-uc_upl_dealloc(
- upl_t upl)
+uc_upl_dealloc(upl_t upl)
{
- upl->ref_count -= 1;
- if(upl->ref_count == 0) {
+ if (--upl->ref_count == 0)
upl_destroy(upl);
- }
}
void
-upl_deallocate(
- upl_t upl)
+upl_deallocate(upl_t upl)
{
-
- upl->ref_count -= 1;
- if(upl->ref_count == 0) {
+ if (--upl->ref_count == 0)
upl_destroy(upl);
- }
}
/*
int cntrl_flags)
{
vm_page_t dst_page = VM_PAGE_NULL;
- vm_object_offset_t dst_offset = offset;
- upl_size_t xfer_size = size;
- boolean_t do_m_lock = FALSE;
+ vm_object_offset_t dst_offset;
+ upl_size_t xfer_size;
boolean_t dirty;
boolean_t hw_dirty;
upl_t upl = NULL;
boolean_t encountered_lrp = FALSE;
#endif
vm_page_t alias_page = NULL;
- int page_ticket;
- int refmod_state;
+ int refmod_state = 0;
wpl_array_t lite_list = NULL;
vm_object_t last_copy_object;
-
+ int delayed_unlock = 0;
+ int j;
if (cntrl_flags & ~UPL_VALID_FLAGS) {
/*
*/
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");
- page_ticket = (cntrl_flags & UPL_PAGE_TICKET_MASK)
- >> UPL_PAGE_TICKET_SHIFT;
- if(((size/PAGE_SIZE) > MAX_UPL_TRANSFER) && !object->phys_contiguous) {
+ if ((size / PAGE_SIZE) > MAX_UPL_TRANSFER)
size = MAX_UPL_TRANSFER * PAGE_SIZE;
- }
- if(cntrl_flags & UPL_SET_INTERNAL)
- if(page_list_count != NULL)
- *page_list_count = MAX_UPL_TRANSFER;
-
- if((!object->internal) && (object->paging_offset != 0))
- panic("vm_object_upl_request: vnode object with non-zero paging offset\n");
+ if ( (cntrl_flags & UPL_SET_INTERNAL) && page_list_count != NULL)
+ *page_list_count = MAX_UPL_TRANSFER;
- if((cntrl_flags & UPL_COPYOUT_FROM) && (upl_ptr == NULL)) {
- return KERN_SUCCESS;
- }
+ if (cntrl_flags & UPL_SET_INTERNAL) {
+ if (cntrl_flags & UPL_SET_LITE) {
- vm_object_lock(object);
- vm_object_paging_begin(object);
- vm_object_unlock(object);
+ upl = upl_create(UPL_CREATE_INTERNAL | UPL_CREATE_LITE, 0, size);
- if(upl_ptr) {
- if(cntrl_flags & UPL_SET_INTERNAL) {
- if(cntrl_flags & UPL_SET_LITE) {
- uintptr_t page_field_size;
- upl = upl_create(
- UPL_CREATE_INTERNAL | UPL_CREATE_LITE,
- size);
- user_page_list = (upl_page_info_t *)
- (((uintptr_t)upl) + sizeof(struct upl));
- lite_list = (wpl_array_t)
+ 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)));
- page_field_size = ((size/PAGE_SIZE) + 7) >> 3;
- page_field_size =
- (page_field_size + 3) & 0xFFFFFFFC;
- bzero((char *)lite_list, page_field_size);
- upl->flags =
- UPL_LITE | UPL_INTERNAL;
- } else {
- upl = upl_create(UPL_CREATE_INTERNAL, size);
- user_page_list = (upl_page_info_t *)
- (((uintptr_t)upl) + sizeof(struct upl));
- upl->flags = UPL_INTERNAL;
- }
+ ((size/PAGE_SIZE) * sizeof(upl_page_info_t)));
} else {
- if(cntrl_flags & UPL_SET_LITE) {
- uintptr_t page_field_size;
- upl = upl_create(UPL_CREATE_LITE, size);
- lite_list = (wpl_array_t)
- (((uintptr_t)upl) + sizeof(struct upl));
- page_field_size = ((size/PAGE_SIZE) + 7) >> 3;
- page_field_size =
- (page_field_size + 3) & 0xFFFFFFFC;
- bzero((char *)lite_list, page_field_size);
- upl->flags = UPL_LITE;
- } else {
- upl = upl_create(UPL_CREATE_EXTERNAL, size);
- upl->flags = 0;
- }
- }
-
- if (object->phys_contiguous) {
- if ((cntrl_flags & UPL_WILL_MODIFY) &&
- object->copy != VM_OBJECT_NULL) {
- /* Honor copy-on-write obligations */
-
- /*
- * XXX FBDP
- * We could still have a race...
- * A is here building the UPL for a write().
- * A pushes the pages to the current copy
- * object.
- * A returns the UPL to the caller.
- * B comes along and establishes another
- * private mapping on this object, inserting
- * a new copy object between the original
- * object and the old copy object.
- * B reads a page and gets the original contents
- * from the original object.
- * A modifies the page in the original object.
- * B reads the page again and sees A's changes,
- * which is wrong...
- *
- * The problem is that the pages are not
- * marked "busy" in the original object, so
- * nothing prevents B from reading it before
- * before A's changes are completed.
- *
- * The "paging_in_progress" might protect us
- * from the insertion of a new copy object
- * though... To be verified.
- */
- vm_object_lock_request(object,
- offset,
- size,
- FALSE,
- MEMORY_OBJECT_COPY_SYNC,
- VM_PROT_NO_CHANGE);
- upl_cow_contiguous++;
- upl_cow_contiguous_pages += size >> PAGE_SHIFT;
- }
-
- upl->map_object = object;
- /* don't need any shadow mappings for this one */
- /* since it is already I/O memory */
- upl->flags |= UPL_DEVICE_MEMORY;
-
-
- /* paging_in_progress protects paging_offset */
- upl->offset = offset + object->paging_offset;
- upl->size = size;
- *upl_ptr = upl;
- if(user_page_list) {
- user_page_list[0].phys_addr =
- (offset + object->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;
- }
- }
+ upl = upl_create(UPL_CREATE_INTERNAL, 0, size);
- return KERN_SUCCESS;
+ user_page_list = (upl_page_info_t *) (((uintptr_t)upl) + sizeof(struct upl));
}
+ } else {
+ if (cntrl_flags & UPL_SET_LITE) {
- if(user_page_list)
- user_page_list[0].device = FALSE;
+ upl = upl_create(UPL_CREATE_EXTERNAL | UPL_CREATE_LITE, 0, size);
- if(cntrl_flags & UPL_SET_LITE) {
- upl->map_object = object;
+ lite_list = (wpl_array_t) (((uintptr_t)upl) + sizeof(struct upl));
} 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->shadow_offset = offset;
- upl->map_object->wimg_bits = object->wimg_bits;
+ upl = upl_create(UPL_CREATE_EXTERNAL, 0, size);
}
-
- }
- if (!(cntrl_flags & UPL_SET_LITE)) {
- VM_PAGE_GRAB_FICTITIOUS(alias_page);
}
+ *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->shadow_offset = offset;
+ upl->map_object->wimg_bits = object->wimg_bits;
+
+ VM_PAGE_GRAB_FICTITIOUS(alias_page);
+ upl->flags |= UPL_SHADOWED;
+ }
/*
* ENCRYPTED SWAP:
* Just mark the UPL as "encrypted" here.
* in upl_encrypt(), when the caller has
* selected which pages need to go to swap.
*/
- if (cntrl_flags & UPL_ENCRYPT) {
+ if (cntrl_flags & UPL_ENCRYPT)
upl->flags |= UPL_ENCRYPTED;
- }
- if (cntrl_flags & UPL_FOR_PAGEOUT) {
+
+ if (cntrl_flags & UPL_FOR_PAGEOUT)
upl->flags |= UPL_PAGEOUT;
- }
+
vm_object_lock(object);
+ vm_object_paging_begin(object);
+
+ /*
+ * we can lock in the paging_offset once paging_in_progress is set
+ */
+ upl->size = size;
+ upl->offset = offset + object->paging_offset;
- /* we can lock in the paging_offset once paging_in_progress is set */
- if(upl_ptr) {
- upl->size = size;
- upl->offset = offset + object->paging_offset;
- *upl_ptr = upl;
#ifdef UPL_DEBUG
- queue_enter(&object->uplq, upl, upl_t, uplq);
+ queue_enter(&object->uplq, upl, upl_t, uplq);
#endif /* UPL_DEBUG */
- }
-
- if ((cntrl_flags & UPL_WILL_MODIFY) &&
- object->copy != VM_OBJECT_NULL) {
- /* Honor copy-on-write obligations */
+ 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
VM_PROT_NO_CHANGE);
upl_cow++;
upl_cow_pages += size >> PAGE_SHIFT;
-
}
- /* remember which copy object we synchronized with */
+ /*
+ * remember which copy object we synchronized with
+ */
last_copy_object = object->copy;
-
entry = 0;
- if(cntrl_flags & UPL_COPYOUT_FROM) {
- upl->flags |= UPL_PAGE_SYNC_DONE;
- while (xfer_size) {
- if((alias_page == NULL) &&
- !(cntrl_flags & UPL_SET_LITE)) {
- vm_object_unlock(object);
- VM_PAGE_GRAB_FICTITIOUS(alias_page);
- vm_object_lock(object);
+ xfer_size = size;
+ dst_offset = offset;
+
+ while (xfer_size) {
+
+ if ((alias_page == NULL) && !(cntrl_flags & UPL_SET_LITE)) {
+ if (delayed_unlock) {
+ delayed_unlock = 0;
+ vm_page_unlock_queues();
+ }
+ vm_object_unlock(object);
+ VM_PAGE_GRAB_FICTITIOUS(alias_page);
+ goto relock;
+ }
+ if (delayed_unlock == 0) {
+ /*
+ * 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.
+ */
+ vm_object_unlock(object);
+relock:
+ for (j = 0; ; j++) {
+ vm_page_lock_queues();
+
+ if (vm_object_lock_try(object))
+ break;
+ vm_page_unlock_queues();
+ mutex_pause(j);
}
+ delayed_unlock = 1;
+ }
+ 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 ||
- (dst_page->wire_count && !dst_page->pageout) ||
-
- ((!dst_page->inactive) && (cntrl_flags & UPL_FOR_PAGEOUT) &&
- (dst_page->page_ticket != page_ticket) &&
- ((dst_page->page_ticket+1) != page_ticket)) ) {
+ (dst_page->wire_count && !dst_page->pageout && !dst_page->list_req_pending)) {
if (user_page_list)
user_page_list[entry].phys_addr = 0;
- } else {
+
+ goto delay_unlock_queues;
+ }
+ /*
+ * 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->pmapped)
+ refmod_state = pmap_get_refmod(dst_page->phys_page);
+ else
+ refmod_state = 0;
+
+ if ( (refmod_state & VM_MEM_REFERENCED) && dst_page->inactive ) {
/*
- * 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
+ * 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
*/
- refmod_state = pmap_get_refmod(dst_page->phys_page);
-
- if (cntrl_flags & UPL_RET_ONLY_DIRTY) {
+ vm_page_activate(dst_page);
+ VM_STAT_INCR(reactivations);
+ }
+ 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)) {
/*
- * 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 diry or
- * precious to decide whether to return it
- */
- if (dst_page->dirty || dst_page->precious ||
- (refmod_state & VM_MEM_MODIFIED)) {
- goto check_busy;
- }
- }
- /*
- * 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 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 ( !(refmod_state & VM_MEM_REFERENCED) &&
- ((refmod_state & VM_MEM_MODIFIED) ||
- dst_page->dirty || dst_page->precious) ) {
+ if (dst_page->dirty || dst_page->precious || (refmod_state & VM_MEM_MODIFIED))
goto check_busy;
- }
- /*
- * 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;
- entry++;
- dst_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- continue;
- }
-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;
- }
- entry++;
- dst_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- continue;
- }
- /*
- * someone else is playing with the
- * page. We will have to wait.
- */
- PAGE_SLEEP(object, dst_page, THREAD_UNINT);
- continue;
+ goto dont_return;
}
- /* Someone else already cleaning the page? */
- if((dst_page->cleaning || dst_page->absent ||
- dst_page->wire_count != 0) &&
- !dst_page->list_req_pending) {
- if(user_page_list) {
- user_page_list[entry].phys_addr = 0;
- }
- entry++;
- dst_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- continue;
+ /*
+ * 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;
}
- /* eliminate all mappings from the */
- /* original object and its prodigy */
-
- vm_page_lock_queues();
+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;
- if (dst_page->pageout_queue == TRUE)
- /*
- * 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_queue_steal(dst_page);
-#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
- == FALSE)) {
- 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;
- dst_page->cleaning = FALSE;
-
- hw_dirty = refmod_state & VM_MEM_MODIFIED;
- dirty = hw_dirty ? TRUE : dst_page->dirty;
-
- if(cntrl_flags & UPL_SET_LITE) {
- int pg_num;
- pg_num = (dst_offset-offset)/PAGE_SIZE;
- lite_list[pg_num>>5] |=
- 1 << (pg_num & 31);
- if (hw_dirty)
- pmap_clear_modify(dst_page->phys_page);
- /*
- * Record that this page has been
- * written out
- */
-#if MACH_PAGEMAP
- vm_external_state_set(
- object->existence_map,
- dst_page->offset);
-#endif /*MACH_PAGEMAP*/
+ goto delay_unlock_queues;
+ }
+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;
- /*
- * Mark original page as cleaning
- * in place.
- */
- dst_page->cleaning = TRUE;
- dst_page->dirty = 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);
-
- alias_page->absent = FALSE;
- alias_page = NULL;
- }
-
- if(!dirty) {
- dst_page->dirty = FALSE;
- dst_page->precious = TRUE;
+ goto delay_unlock_queues;
}
+ /*
+ * someone else is playing with the
+ * page. We will have to wait.
+ */
+ delayed_unlock = 0;
+ vm_page_unlock_queues();
- if(dst_page->pageout)
- dst_page->busy = TRUE;
+ PAGE_SLEEP(object, dst_page, THREAD_UNINT);
- 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.
- */
- dst_page->busy = TRUE;
- }
- if ( !(cntrl_flags & UPL_CLEAN_IN_PLACE) ) {
- /*
- * deny access to the target page
- * while it is being worked on
- */
- if ((!dst_page->pageout) &&
- (dst_page->wire_count == 0)) {
- dst_page->busy = TRUE;
- dst_page->pageout = TRUE;
- vm_page_wire(dst_page);
- }
- }
+ continue;
+ }
+ /*
+ * Someone else already cleaning the page?
+ */
+ if ((dst_page->cleaning || dst_page->absent || dst_page->wire_count != 0) && !dst_page->list_req_pending) {
+ if (user_page_list)
+ user_page_list[entry].phys_addr = 0;
- if(user_page_list) {
- user_page_list[entry].phys_addr
- = dst_page->phys_page;
- user_page_list[entry].dirty =
- dst_page->dirty;
- user_page_list[entry].pageout =
- dst_page->pageout;
- user_page_list[entry].absent =
- dst_page->absent;
- user_page_list[entry].precious =
- dst_page->precious;
- }
- vm_page_unlock_queues();
+ goto delay_unlock_queues;
+ }
+ /*
+ * 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;
+ delayed_unlock = 0;
+ vm_page_unlock_queues();
/*
- * 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.
+ * save the current state of busy
+ * mark page as busy while decrypt
+ * is in progress since it will drop
+ * the object lock...
*/
- if (! (cntrl_flags & UPL_ENCRYPT) &&
- dst_page->encrypted) {
- assert(dst_page->busy);
+ was_busy = dst_page->busy;
+ dst_page->busy = TRUE;
- vm_page_decrypt(dst_page, 0);
- vm_page_decrypt_for_upl_counter++;
+ vm_page_decrypt(dst_page, 0);
+ vm_page_decrypt_for_upl_counter++;
+ /*
+ * restore to original busy state
+ */
+ dst_page->busy = was_busy;
- /*
- * Retry this page, since anything
- * could have changed while we were
- * decrypting.
- */
- continue;
- }
+ vm_page_lock_queues();
+ delayed_unlock = 1;
}
- entry++;
- dst_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- }
- } else {
- while (xfer_size) {
- if((alias_page == NULL) &&
- !(cntrl_flags & UPL_SET_LITE)) {
- vm_object_unlock(object);
- VM_PAGE_GRAB_FICTITIOUS(alias_page);
- vm_object_lock(object);
+ if (dst_page->pageout_queue == TRUE)
+ /*
+ * 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_queue_steal(dst_page);
+#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;
+
+ hw_dirty = refmod_state & VM_MEM_MODIFIED;
+ dirty = hw_dirty ? TRUE : dst_page->dirty;
+
+ if (dst_page->phys_page > upl->highest_page)
+ upl->highest_page = dst_page->phys_page;
+
+ if (cntrl_flags & UPL_SET_LITE) {
+ int pg_num;
+
+ pg_num = (dst_offset-offset)/PAGE_SIZE;
+ lite_list[pg_num>>5] |= 1 << (pg_num & 31);
+
+ if (hw_dirty)
+ pmap_clear_modify(dst_page->phys_page);
+
+ /*
+ * 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);
+
+ 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 ((cntrl_flags & UPL_WILL_MODIFY) &&
- object->copy != last_copy_object) {
- /* Honor copy-on-write obligations */
+ 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) && (dst_page->wire_count == 0)) {
+ dst_page->busy = TRUE;
+ dst_page->pageout = TRUE;
+ vm_page_wire(dst_page);
+ }
+ }
+ } 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
* to see both the *before* and *after* pages.
*/
if (object->copy != VM_OBJECT_NULL) {
+ delayed_unlock = 0;
+ vm_page_unlock_queues();
+
vm_object_update(
object,
dst_offset,/* current offset */
FALSE, /* should_return */
MEMORY_OBJECT_COPY_SYNC,
VM_PROT_NO_CHANGE);
+
upl_cow_again++;
- upl_cow_again_pages +=
- xfer_size >> PAGE_SHIFT;
+ upl_cow_again_pages += xfer_size >> PAGE_SHIFT;
+
+ vm_page_lock_queues();
+ delayed_unlock = 1;
}
- /* remember the copy object we synced with */
+ /*
+ * 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) &&
- !((dst_page->list_req_pending)
- && (dst_page->absent))) {
- /* we are doing extended range */
- /* requests. we want to grab */
- /* pages around some which are */
- /* already present. */
- if(user_page_list) {
- user_page_list[entry].phys_addr = 0;
+ if (dst_page != VM_PAGE_NULL) {
+ if ( !(dst_page->list_req_pending) ) {
+ if ((cntrl_flags & UPL_RET_ONLY_ABSENT) && !dst_page->absent) {
+ /*
+ * skip over pages already present in the cache
+ */
+ if (user_page_list)
+ user_page_list[entry].phys_addr = 0;
+
+ goto delay_unlock_queues;
}
- entry++;
- dst_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- continue;
- }
- if((dst_page->cleaning) &&
- !(dst_page->list_req_pending)) {
- /*someone else is writing to the */
- /* page. We will have to wait. */
- PAGE_SLEEP(object,dst_page,THREAD_UNINT);
- continue;
- }
- if ((dst_page->fictitious &&
- dst_page->list_req_pending)) {
- /* dump the fictitious page */
- dst_page->list_req_pending = FALSE;
- dst_page->clustered = FALSE;
+ if (dst_page->cleaning) {
+ /*
+ * someone else is writing to the page... wait...
+ */
+ delayed_unlock = 0;
+ vm_page_unlock_queues();
- vm_page_lock_queues();
- vm_page_free(dst_page);
- vm_page_unlock_queues();
+ PAGE_SLEEP(object, dst_page, THREAD_UNINT);
+
+ 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;
- dst_page = NULL;
- } else if ((dst_page->absent &&
- dst_page->list_req_pending)) {
- /* the default_pager case */
- dst_page->list_req_pending = FALSE;
- dst_page->busy = FALSE;
+ vm_page_free(dst_page);
+
+ dst_page = NULL;
+ } else if (dst_page->absent) {
+ /*
+ * the default_pager case
+ */
+ dst_page->list_req_pending = FALSE;
+ dst_page->busy = FALSE;
+ }
}
}
- if(dst_page == VM_PAGE_NULL) {
- if(object->private) {
+ 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
- * reslove the actual backing
+ * resolve the actual backing
* physical page by asking the
* backing device.
*/
- if(user_page_list) {
+ if (user_page_list)
user_page_list[entry].phys_addr = 0;
- }
- entry++;
- dst_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- continue;
+
+ goto delay_unlock_queues;
}
- /* need to allocate a page */
- dst_page = vm_page_alloc(object, dst_offset);
+ /*
+ * need to allocate a page
+ */
+ dst_page = vm_page_grab();
+
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...
+ */
+ delayed_unlock = 0;
+ vm_page_unlock_queues();
+
vm_object_unlock(object);
VM_PAGE_WAIT();
- vm_object_lock(object);
+
+ /*
+ * 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.
+ */
+ for (j = 0; ; j++) {
+ vm_page_lock_queues();
+
+ if (vm_object_lock_try(object))
+ break;
+ vm_page_unlock_queues();
+ mutex_pause(j);
+ }
+ delayed_unlock = 1;
+
continue;
}
+ vm_page_insert_internal(dst_page, object, dst_offset, TRUE);
+
+ dst_page->absent = TRUE;
dst_page->busy = FALSE;
-#if 0
- if(cntrl_flags & UPL_NO_SYNC) {
- dst_page->page_lock = 0;
- dst_page->unlock_request = 0;
- }
-#endif
- if(cntrl_flags & UPL_RET_ONLY_ABSENT) {
+
+ 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 vm_fault can correctly attribute them
- * to the 'pagein' bucket the first time
- * a fault happens on them
+ * so upl_commit_range can put them on the
+ * speculative list
*/
dst_page->clustered = TRUE;
}
- dst_page->absent = TRUE;
- object->absent_count++;
}
-#if 1
- if(cntrl_flags & UPL_NO_SYNC) {
- dst_page->page_lock = 0;
- dst_page->unlock_request = 0;
- }
-#endif /* 1 */
-
/*
* ENCRYPTED SWAP:
*/
*/
dst_page->encrypted = FALSE;
}
-
dst_page->overwriting = TRUE;
- if(dst_page->fictitious) {
+
+ if (dst_page->fictitious) {
panic("need corner case for fictitious page");
}
- if(dst_page->page_lock) {
- do_m_lock = TRUE;
- }
- if(upl_ptr) {
+ if (dst_page->busy) {
+ /*
+ * someone else is playing with the
+ * page. We will have to wait.
+ */
+ delayed_unlock = 0;
+ vm_page_unlock_queues();
- /* eliminate all mappings from the */
- /* original object and its prodigy */
-
- if(dst_page->busy) {
- /*someone else is playing with the */
- /* page. We will have to wait. */
- PAGE_SLEEP(object, dst_page, THREAD_UNINT);
- continue;
- }
- vm_page_lock_queues();
+ PAGE_SLEEP(object, dst_page, THREAD_UNINT);
- if( !(cntrl_flags & UPL_FILE_IO))
- hw_dirty = pmap_disconnect(dst_page->phys_page) & VM_MEM_MODIFIED;
- else
- hw_dirty = pmap_get_refmod(dst_page->phys_page) & VM_MEM_MODIFIED;
- dirty = hw_dirty ? TRUE : dst_page->dirty;
-
- if(cntrl_flags & UPL_SET_LITE) {
- int pg_num;
- pg_num = (dst_offset-offset)/PAGE_SIZE;
- lite_list[pg_num>>5] |=
- 1 << (pg_num & 31);
- if (hw_dirty)
- pmap_clear_modify(dst_page->phys_page);
- /*
- * Record that this page has been
- * written out
+ continue;
+ }
+ if (dst_page->pmapped) {
+ if ( !(cntrl_flags & UPL_FILE_IO))
+ /*
+ * eliminate all mappings from the
+ * original object and its prodigy
*/
-#if MACH_PAGEMAP
- vm_external_state_set(
- object->existence_map,
- dst_page->offset);
-#endif /*MACH_PAGEMAP*/
+ refmod_state = pmap_disconnect(dst_page->phys_page);
+ else
+ refmod_state = pmap_get_refmod(dst_page->phys_page);
+ } else
+ refmod_state = 0;
- /*
- * Mark original page as cleaning
- * in place.
- */
- dst_page->cleaning = TRUE;
- dst_page->dirty = 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);
-
- alias_page->absent = FALSE;
- alias_page = NULL;
- }
+ hw_dirty = refmod_state & VM_MEM_MODIFIED;
+ dirty = hw_dirty ? TRUE : dst_page->dirty;
- 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;
- }
+ if (cntrl_flags & UPL_SET_LITE) {
+ int pg_num;
- if(!dirty) {
- dst_page->dirty = FALSE;
- dst_page->precious = TRUE;
- }
-
- if (dst_page->wire_count == 0) {
- /* deny access to the target page while */
- /* it is being worked on */
- dst_page->busy = TRUE;
- } else {
- vm_page_wire(dst_page);
- }
- if(cntrl_flags & UPL_RET_ONLY_ABSENT) {
- /*
- * expect the page not to be used
- * since it's coming in as part
- * of a cluster and could be
- * speculative... pages that
- * are 'consumed' will get a
- * hardware reference
- */
- dst_page->reference = FALSE;
- } else {
- /*
- * expect the page to be used
- */
- dst_page->reference = TRUE;
- }
- dst_page->precious =
- (cntrl_flags & UPL_PRECIOUS)
- ? TRUE : FALSE;
- if(user_page_list) {
- user_page_list[entry].phys_addr
- = dst_page->phys_page;
- user_page_list[entry].dirty =
- dst_page->dirty;
- user_page_list[entry].pageout =
- dst_page->pageout;
- user_page_list[entry].absent =
- dst_page->absent;
- user_page_list[entry].precious =
- dst_page->precious;
- }
- vm_page_unlock_queues();
+ pg_num = (dst_offset-offset)/PAGE_SIZE;
+ lite_list[pg_num>>5] |= 1 << (pg_num & 31);
+
+ if (hw_dirty)
+ pmap_clear_modify(dst_page->phys_page);
+
+ /*
+ * 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);
+
+ alias_page->absent = FALSE;
+ alias_page = NULL;
}
- entry++;
- dst_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- }
- }
- if (upl->flags & UPL_INTERNAL) {
- if(page_list_count != NULL)
- *page_list_count = 0;
- } else if (*page_list_count > entry) {
- if(page_list_count != NULL)
- *page_list_count = entry;
- }
+ 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;
- if(alias_page != NULL) {
- vm_page_lock_queues();
- vm_page_free(alias_page);
- vm_page_unlock_queues();
- }
+ if (!dirty)
+ dst_page->precious = TRUE;
- if(do_m_lock) {
- vm_prot_t access_required;
- /* call back all associated pages from other users of the pager */
- /* all future updates will be on data which is based on the */
- /* changes we are going to make here. Note: it is assumed that */
- /* we already hold copies of the data so we will not be seeing */
- /* an avalanche of incoming data from the pager */
- access_required = (cntrl_flags & UPL_COPYOUT_FROM)
- ? VM_PROT_READ : VM_PROT_WRITE;
- while (TRUE) {
- kern_return_t rc;
-
- if(!object->pager_ready) {
- wait_result_t wait_result;
-
- wait_result = vm_object_sleep(object,
- VM_OBJECT_EVENT_PAGER_READY,
- THREAD_UNINT);
- if (wait_result != THREAD_AWAKENED) {
- vm_object_unlock(object);
- return KERN_FAILURE;
- }
- continue;
- }
+ if (dst_page->wire_count == 0) {
+ /*
+ * deny access to the target page while
+ * it is being worked on
+ */
+ dst_page->busy = TRUE;
+ } else
+ vm_page_wire(dst_page);
- vm_object_unlock(object);
- rc = memory_object_data_unlock(
- object->pager,
- dst_offset + object->paging_offset,
- size,
- access_required);
- if (rc != KERN_SUCCESS && rc != MACH_SEND_INTERRUPTED)
- return KERN_FAILURE;
- vm_object_lock(object);
+ if (dst_page->clustered) {
+ /*
+ * expect the page not to be used
+ * since it's coming in as part
+ * of a speculative cluster...
+ * pages that are 'consumed' will
+ * get a hardware reference
+ */
+ dst_page->reference = FALSE;
+ } else {
+ /*
+ * expect the page to be used
+ */
+ dst_page->reference = TRUE;
+ }
+ 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].dirty = dst_page->dirty;
+ user_page_list[entry].pageout = dst_page->pageout;
+ user_page_list[entry].absent = dst_page->absent;
+ user_page_list[entry].precious = dst_page->precious;
+
+ if (dst_page->clustered == TRUE)
+ user_page_list[entry].speculative = dst_page->speculative;
+ else
+ user_page_list[entry].speculative = 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
+ *
+ */
+ VM_PAGE_CONSUME_CLUSTERED(dst_page);
+ }
+delay_unlock_queues:
+ if (delayed_unlock++ > UPL_DELAYED_UNLOCK_LIMIT) {
+ /*
+ * 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.
+ */
+ vm_object_unlock(object);
+ mutex_yield(&vm_page_queue_lock);
- if (rc == KERN_SUCCESS)
- break;
- }
-
- /* lets wait on the last page requested */
- /* NOTE: we will have to update lock completed routine to signal */
- if(dst_page != VM_PAGE_NULL &&
- (access_required & dst_page->page_lock) != access_required) {
- PAGE_ASSERT_WAIT(dst_page, THREAD_UNINT);
- vm_object_unlock(object);
- thread_block(THREAD_CONTINUE_NULL);
- return KERN_SUCCESS;
- }
+ for (j = 0; ; j++) {
+ if (vm_object_lock_try(object))
+ break;
+ vm_page_unlock_queues();
+ mutex_pause(j);
+ vm_page_lock_queues();
+ }
+ delayed_unlock = 1;
+ }
+try_next_page:
+ entry++;
+ dst_offset += PAGE_SIZE_64;
+ xfer_size -= PAGE_SIZE;
+ }
+ if (alias_page != NULL) {
+ if (delayed_unlock == 0) {
+ vm_page_lock_queues();
+ delayed_unlock = 1;
+ }
+ vm_page_free(alias_page);
}
+ if (delayed_unlock)
+ vm_page_unlock_queues();
+ 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_object_unlock(object);
+
return KERN_SUCCESS;
}
upl_size_t size,
upl_t *upl_ptr,
upl_page_info_t **user_page_list_ptr,
- int page_list_count,
+ unsigned int page_list_count,
int cntrl_flags);
kern_return_t
vm_fault_list_request(
upl_size_t size,
upl_t *upl_ptr,
upl_page_info_t **user_page_list_ptr,
- int page_list_count,
+ unsigned int page_list_count,
int cntrl_flags)
{
- int local_list_count;
+ unsigned int local_list_count;
upl_page_info_t *user_page_list;
kern_return_t kr;
unsigned int *page_list_count,
int cntrl_flags)
{
- vm_page_t target_page;
- int ticket;
-
-
- if(object->paging_offset > offset)
+ if (object->paging_offset > offset)
return KERN_FAILURE;
assert(object->paging_in_progress);
offset = offset - object->paging_offset;
- if(cntrl_flags & UPL_FOR_PAGEOUT) {
-
- vm_object_lock(object);
-
- if((target_page = vm_page_lookup(object, offset))
- != VM_PAGE_NULL) {
- ticket = target_page->page_ticket;
- cntrl_flags = cntrl_flags & ~(int)UPL_PAGE_TICKET_MASK;
- cntrl_flags = cntrl_flags |
- ((ticket << UPL_PAGE_TICKET_SHIFT)
- & UPL_PAGE_TICKET_MASK);
- }
- vm_object_unlock(object);
- }
-
if (super_cluster > size) {
vm_object_offset_t base_offset;
upl_size_t super_size;
- 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 = ((base_offset + super_size) > object->size) ?
- (object->size - base_offset) : super_size;
- 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);
+ 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 = ((base_offset + super_size) > object->size) ? (object->size - base_offset) : super_size;
+
+ 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 = (offset + size) - base_offset;
+ if ((offset + size) > (base_offset + super_size))
+ super_size = (offset + size) - base_offset;
offset = base_offset;
size = super_size;
}
- return vm_object_upl_request(object, offset, size,
- upl, user_page_list, page_list_count,
- cntrl_flags);
+ return vm_object_upl_request(object, offset, size, upl, user_page_list, page_list_count, cntrl_flags);
}
*/
return KERN_INVALID_VALUE;
}
-
force_data_sync = (caller_flags & UPL_FORCE_DATA_SYNC);
sync_cow_data = !(caller_flags & UPL_COPYOUT_FROM);
- if(upl == NULL)
+ if (upl == NULL)
return KERN_INVALID_ARGUMENT;
-
REDISCOVER_ENTRY:
vm_map_lock(map);
+
if (vm_map_lookup_entry(map, offset, &entry)) {
- if (entry->object.vm_object == VM_OBJECT_NULL ||
- !entry->object.vm_object->phys_contiguous) {
- if((*upl_size/page_size) > MAX_UPL_TRANSFER) {
- *upl_size = MAX_UPL_TRANSFER * page_size;
- }
- }
- if((entry->vme_end - offset) < *upl_size) {
+
+ if ((entry->vme_end - offset) < *upl_size)
*upl_size = entry->vme_end - offset;
- }
+
if (caller_flags & UPL_QUERY_OBJECT_TYPE) {
- if (entry->object.vm_object == VM_OBJECT_NULL) {
- *flags = 0;
- } else if (entry->object.vm_object->private) {
- *flags = UPL_DEV_MEMORY;
- if (entry->object.vm_object->phys_contiguous) {
+ *flags = 0;
+
+ if (entry->object.vm_object != VM_OBJECT_NULL) {
+ if (entry->object.vm_object->private)
+ *flags = UPL_DEV_MEMORY;
+
+ if (entry->object.vm_object->phys_contiguous)
*flags |= UPL_PHYS_CONTIG;
- }
- } else {
- *flags = 0;
}
vm_map_unlock(map);
+
return KERN_SUCCESS;
}
+ if (entry->object.vm_object == VM_OBJECT_NULL || !entry->object.vm_object->phys_contiguous) {
+ if ((*upl_size/page_size) > MAX_UPL_TRANSFER)
+ *upl_size = MAX_UPL_TRANSFER * page_size;
+ }
/*
* Create an object if necessary.
*/
if (entry->object.vm_object == VM_OBJECT_NULL) {
- entry->object.vm_object = vm_object_allocate(
- (vm_size_t)(entry->vme_end - entry->vme_start));
+ entry->object.vm_object = vm_object_allocate((vm_size_t)(entry->vme_end - entry->vme_start));
entry->offset = 0;
}
if (!(caller_flags & UPL_COPYOUT_FROM)) {
if (entry->needs_copy) {
vm_map_t local_map;
vm_object_t object;
- vm_map_offset_t offset_hi;
- vm_map_offset_t offset_lo;
vm_object_offset_t new_offset;
vm_prot_t prot;
boolean_t wired;
- vm_behavior_t behavior;
vm_map_version_t version;
vm_map_t real_map;
local_map = map;
vm_map_lock_write_to_read(map);
- if(vm_map_lookup_locked(&local_map,
- offset, VM_PROT_WRITE,
- &version, &object,
- &new_offset, &prot, &wired,
- &behavior, &offset_lo,
- &offset_hi, &real_map)) {
- vm_map_unlock(local_map);
+
+ if (vm_map_lookup_locked(&local_map,
+ offset, VM_PROT_WRITE,
+ OBJECT_LOCK_EXCLUSIVE,
+ &version, &object,
+ &new_offset, &prot, &wired,
+ NULL,
+ &real_map)) {
+ vm_map_unlock(local_map);
return KERN_FAILURE;
}
- if (real_map != map) {
+ if (real_map != map)
vm_map_unlock(real_map);
- }
vm_object_unlock(object);
vm_map_unlock(local_map);
submap = entry->object.sub_map;
local_start = entry->vme_start;
local_offset = entry->offset;
+
vm_map_reference(submap);
vm_map_unlock(map);
- ret = (vm_map_create_upl(submap,
- local_offset + (offset - local_start),
- upl_size, upl, page_list, count,
- flags));
-
+ ret = vm_map_create_upl(submap,
+ local_offset + (offset - local_start),
+ upl_size, upl, page_list, count, flags);
vm_map_deallocate(submap);
+
return ret;
}
-
if (sync_cow_data) {
- if (entry->object.vm_object->shadow
- || entry->object.vm_object->copy) {
-
+ 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(map);
- if (entry->object.vm_object->shadow &&
- entry->object.vm_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);
+ if (entry->object.vm_object->shadow && entry->object.vm_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);
+
goto REDISCOVER_ENTRY;
}
}
-
if (force_data_sync) {
-
local_object = entry->object.vm_object;
local_start = entry->vme_start;
local_offset = entry->offset;
+
vm_object_reference(local_object);
vm_map_unlock(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);
+ 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 (entry->object.vm_object->private)
+ *flags = UPL_DEV_MEMORY;
+ else
+ *flags = 0;
+
+ if (entry->object.vm_object->phys_contiguous)
+ *flags |= UPL_PHYS_CONTIG;
- if(!(entry->object.vm_object->private)) {
- if(*upl_size > (MAX_UPL_TRANSFER*PAGE_SIZE))
- *upl_size = (MAX_UPL_TRANSFER*PAGE_SIZE);
- if(entry->object.vm_object->phys_contiguous) {
- *flags = UPL_PHYS_CONTIG;
- } else {
- *flags = 0;
- }
- } else {
- *flags = UPL_DEV_MEMORY | UPL_PHYS_CONTIG;
- }
local_object = entry->object.vm_object;
local_offset = entry->offset;
local_start = entry->vme_start;
+
vm_object_reference(local_object);
vm_map_unlock(map);
- if(caller_flags & UPL_SET_IO_WIRE) {
- ret = (vm_object_iopl_request(local_object,
- (vm_object_offset_t)
- ((offset - local_start)
- + local_offset),
- *upl_size,
- upl,
- page_list,
- count,
- caller_flags));
- } else {
- ret = (vm_object_upl_request(local_object,
- (vm_object_offset_t)
- ((offset - local_start)
- + local_offset),
- *upl_size,
- upl,
- page_list,
- count,
- caller_flags));
- }
+
+ 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(ret);
}
-
vm_map_unlock(map);
- return(KERN_FAILURE);
+ return(KERN_FAILURE);
}
/*
upl_lock(upl);
- /* check to see if already mapped */
- if(UPL_PAGE_LIST_MAPPED & upl->flags) {
+ /*
+ * check to see if already mapped
+ */
+ if (UPL_PAGE_LIST_MAPPED & upl->flags) {
upl_unlock(upl);
return KERN_FAILURE;
}
- if((!(upl->map_object->pageout)) &&
- !((upl->flags & (UPL_DEVICE_MEMORY | UPL_IO_WIRE)) ||
- (upl->map_object->phys_contiguous))) {
+ 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;
int pg_num;
wpl_array_t lite_list;
- if(upl->flags & UPL_INTERNAL) {
+ 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)));
+ + ((upl->size/PAGE_SIZE) * sizeof(upl_page_info_t)));
} else {
- lite_list = (wpl_array_t)
- (((uintptr_t)upl) + sizeof(struct upl));
+ lite_list = (wpl_array_t)(((uintptr_t)upl) + sizeof(struct upl));
}
object = upl->map_object;
upl->map_object = vm_object_allocate(upl->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->shadow_offset =
- upl->offset - object->paging_offset;
+ 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;
- vm_object_lock(object);
+ upl->flags |= UPL_SHADOWED;
- while(size) {
- pg_num = (new_offset)/PAGE_SIZE;
- if(lite_list[pg_num>>5] & (1 << (pg_num & 31))) {
- vm_object_unlock(object);
- 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");
- }
+ while (size) {
+ pg_num = (new_offset)/PAGE_SIZE;
- vm_object_paging_begin(object);
+ if (lite_list[pg_num>>5] & (1 << (pg_num & 31))) {
- /*
- * 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;
- alias_page->phys_page = m->phys_page;
+ VM_PAGE_GRAB_FICTITIOUS(alias_page);
- vm_page_lock_queues();
- vm_page_wire(alias_page);
- vm_page_unlock_queues();
+ vm_object_lock(object);
- /*
- * 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);
+ m = vm_page_lookup(object, offset);
+ if (m == VM_PAGE_NULL) {
+ panic("vm_upl_map: page missing\n");
+ }
- vm_page_insert(alias_page,
- upl->map_object, new_offset);
- assert(!alias_page->wanted);
- alias_page->busy = FALSE;
- alias_page->absent = FALSE;
- }
+ /*
+ * 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;
+
+ vm_object_unlock(object);
+
+ 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);
- size -= PAGE_SIZE;
- offset += PAGE_SIZE_64;
- new_offset += PAGE_SIZE_64;
+ vm_page_insert(alias_page, upl->map_object, new_offset);
+
+ assert(!alias_page->wanted);
+ alias_page->busy = FALSE;
+ alias_page->absent = FALSE;
+ }
+ size -= PAGE_SIZE;
+ offset += PAGE_SIZE_64;
+ new_offset += PAGE_SIZE_64;
}
- vm_object_unlock(object);
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_lock(upl->map_object);
- upl->map_object->ref_count++;
- vm_object_res_reference(upl->map_object);
- vm_object_unlock(upl->map_object);
+ vm_object_reference(upl->map_object);
*dst_addr = 0;
-
-
- /* NEED A UPL_MAP ALIAS */
+ /*
+ * 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);
+ VM_FLAGS_ANYWHERE, upl->map_object, offset, FALSE,
+ VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
if (kr != KERN_SUCCESS) {
upl_unlock(upl);
return(kr);
}
-
vm_object_lock(upl->map_object);
- for(addr=*dst_addr; size > 0; size-=PAGE_SIZE,addr+=PAGE_SIZE) {
+ for (addr = *dst_addr; size > 0; size -= PAGE_SIZE, addr += PAGE_SIZE) {
m = vm_page_lookup(upl->map_object, offset);
- if(m) {
- unsigned int cache_attr;
- cache_attr = ((unsigned int)m->object->wimg_bits) & VM_WIMG_MASK;
+
+ if (m) {
+ unsigned int cache_attr;
+ cache_attr = ((unsigned int)m->object->wimg_bits) & VM_WIMG_MASK;
+
+ m->pmapped = TRUE;
+ m->wpmapped = TRUE;
- PMAP_ENTER(map->pmap, addr,
- m, VM_PROT_ALL,
- cache_attr, TRUE);
+ PMAP_ENTER(map->pmap, addr, m, VM_PROT_ALL, cache_attr, TRUE);
}
- offset+=PAGE_SIZE_64;
+ offset += PAGE_SIZE_64;
}
vm_object_unlock(upl->map_object);
- upl->ref_count++; /* hold a reference for the mapping */
+ /*
+ * hold a reference for the mapping
+ */
+ upl->ref_count++;
upl->flags |= UPL_PAGE_LIST_MAPPED;
upl->kaddr = *dst_addr;
upl_unlock(upl);
+
return KERN_SUCCESS;
}
return KERN_INVALID_ARGUMENT;
upl_lock(upl);
- if(upl->flags & UPL_PAGE_LIST_MAPPED) {
+
+ if (upl->flags & UPL_PAGE_LIST_MAPPED) {
addr = upl->kaddr;
size = upl->size;
+
assert(upl->ref_count > 1);
upl->ref_count--; /* removing mapping ref */
+
upl->flags &= ~UPL_PAGE_LIST_MAPPED;
upl->kaddr = (vm_offset_t) 0;
upl_unlock(upl);
- vm_map_remove( map,
- vm_map_trunc_page(addr),
- vm_map_round_page(addr + size),
- VM_MAP_NO_FLAGS);
+ vm_map_remove(map,
+ vm_map_trunc_page(addr),
+ vm_map_round_page(addr + size),
+ VM_MAP_NO_FLAGS);
+
return KERN_SUCCESS;
}
upl_unlock(upl);
+
return KERN_FAILURE;
}
mach_msg_type_number_t count,
boolean_t *empty)
{
- upl_size_t xfer_size = size;
+ upl_size_t xfer_size;
vm_object_t shadow_object;
- vm_object_t object = upl->map_object;
+ vm_object_t object;
vm_object_offset_t target_offset;
int entry;
wpl_array_t lite_list;
int occupied;
int delayed_unlock = 0;
int clear_refmod = 0;
- boolean_t shadow_internal;
+ int pgpgout_count = 0;
+ int j;
*empty = FALSE;
if (upl == UPL_NULL)
return KERN_INVALID_ARGUMENT;
-
if (count == 0)
page_list = NULL;
- if (object->pageout) {
- shadow_object = object->shadow;
- } else {
- shadow_object = object;
- }
+ if (upl->flags & UPL_DEVICE_MEMORY)
+ xfer_size = 0;
+ else if ((offset + size) <= upl->size)
+ xfer_size = size;
+ else
+ return KERN_FAILURE;
upl_lock(upl);
*/
flags |= UPL_COMMIT_ALLOW_ACCESS;
}
-
if (upl->flags & UPL_CLEAR_DIRTY)
flags |= UPL_COMMIT_CLEAR_DIRTY;
- if (upl->flags & UPL_DEVICE_MEMORY) {
- xfer_size = 0;
- } else if ((offset + size) > upl->size) {
- upl_unlock(upl);
- 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 (upl->flags & UPL_INTERNAL) {
- lite_list = (wpl_array_t)
- ((((uintptr_t)upl) + sizeof(struct upl))
- + ((upl->size/PAGE_SIZE) * sizeof(upl_page_info_t)));
+ object = upl->map_object;
+
+ if (upl->flags & UPL_SHADOWED) {
+ vm_object_lock(object);
+ shadow_object = object->shadow;
} else {
- lite_list = (wpl_array_t)
- (((uintptr_t)upl) + sizeof(struct upl));
+ shadow_object = object;
}
- if (object != shadow_object)
- vm_object_lock(object);
- vm_object_lock(shadow_object);
-
- shadow_internal = shadow_object->internal;
-
entry = offset/PAGE_SIZE;
target_offset = (vm_object_offset_t)offset;
+ /*
+ * 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.
+ */
+ for (j = 0; ; j++) {
+ vm_page_lock_queues();
+
+ if (vm_object_lock_try(shadow_object))
+ break;
+ vm_page_unlock_queues();
+ mutex_pause(j);
+ }
+ delayed_unlock = 1;
+
while (xfer_size) {
- vm_page_t t,m;
- upl_page_info_t *p;
+ vm_page_t t, m;
m = VM_PAGE_NULL;
if (lite_list[pg_num>>5] & (1 << (pg_num & 31))) {
lite_list[pg_num>>5] &= ~(1 << (pg_num & 31));
- m = vm_page_lookup(shadow_object,
- target_offset + (upl->offset -
- shadow_object->paging_offset));
+
+ m = vm_page_lookup(shadow_object, target_offset + (upl->offset - shadow_object->paging_offset));
}
}
- if (object->pageout) {
- if ((t = vm_page_lookup(object, target_offset)) != NULL) {
+ if (upl->flags & UPL_SHADOWED) {
+ if ((t = vm_page_lookup(object, target_offset)) != VM_PAGE_NULL) {
+
t->pageout = FALSE;
- if (delayed_unlock) {
- delayed_unlock = 0;
- vm_page_unlock_queues();
- }
- VM_PAGE_FREE(t);
+ vm_page_free(t);
- if (m == NULL) {
- m = vm_page_lookup(
- shadow_object,
- target_offset +
- object->shadow_offset);
- }
- if (m != VM_PAGE_NULL)
- vm_object_paging_end(m->object);
+ if (m == VM_PAGE_NULL)
+ m = vm_page_lookup(shadow_object, target_offset + object->shadow_offset);
}
}
if (m != VM_PAGE_NULL) {
- clear_refmod = 0;
+ clear_refmod = 0;
- if (upl->flags & UPL_IO_WIRE) {
+ if (upl->flags & UPL_IO_WIRE) {
- if (delayed_unlock == 0)
- vm_page_lock_queues();
+ vm_page_unwire(m);
- vm_page_unwire(m);
+ if (page_list)
+ page_list[entry].phys_addr = 0;
+
+ if (flags & UPL_COMMIT_SET_DIRTY)
+ m->dirty = TRUE;
+ else if (flags & UPL_COMMIT_CLEAR_DIRTY) {
+ m->dirty = FALSE;
+ if (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;
+ vm_cs_validated_resets++;
+ }
+ clear_refmod |= VM_MEM_MODIFIED;
+ }
+ if (flags & UPL_COMMIT_INACTIVATE)
+ vm_page_deactivate(m);
- if (delayed_unlock++ > DELAYED_UNLOCK_LIMIT) {
- delayed_unlock = 0;
- vm_page_unlock_queues();
- }
- if (page_list) {
- page_list[entry].phys_addr = 0;
+ if (clear_refmod)
+ pmap_clear_refmod(m->phys_page, clear_refmod);
+
+ if (flags & UPL_COMMIT_ALLOW_ACCESS) {
+ /*
+ * We blocked access to the pages in this UPL.
+ * Clear the "busy" bit and wake up any waiter
+ * for this page.
+ */
+ PAGE_WAKEUP_DONE(m);
+ }
+ goto commit_next_page;
}
- if (flags & UPL_COMMIT_SET_DIRTY) {
- m->dirty = TRUE;
- } else if (flags & UPL_COMMIT_CLEAR_DIRTY) {
- m->dirty = FALSE;
+ /*
+ * 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;
+ if (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;
+ vm_cs_validated_resets++;
+ }
clear_refmod |= VM_MEM_MODIFIED;
- }
- if (flags & UPL_COMMIT_INACTIVATE) {
- m->reference = FALSE;
- clear_refmod |= VM_MEM_REFERENCED;
- vm_page_deactivate(m);
}
if (clear_refmod)
pmap_clear_refmod(m->phys_page, clear_refmod);
- if (flags & UPL_COMMIT_ALLOW_ACCESS) {
- /*
- * We blocked access to the pages in this UPL.
- * Clear the "busy" bit and wake up any waiter
- * for this page.
- */
- PAGE_WAKEUP_DONE(m);
- }
+ if (page_list) {
+ upl_page_info_t *p;
- target_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- entry++;
- continue;
- }
- if (delayed_unlock == 0)
- vm_page_lock_queues();
- /*
- * 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;
- clear_refmod |= VM_MEM_MODIFIED;
- }
- if (flags & UPL_COMMIT_INACTIVATE)
- clear_refmod |= VM_MEM_REFERENCED;
+ p = &(page_list[entry]);
- if (clear_refmod)
- pmap_clear_refmod(m->phys_page, clear_refmod);
+ if (p->phys_addr && p->pageout && !m->pageout) {
+ m->busy = TRUE;
+ m->pageout = TRUE;
+ vm_page_wire(m);
+ } else if (p->phys_addr &&
+ !p->pageout && m->pageout &&
+ !m->dump_cleaning) {
+ m->pageout = FALSE;
+ m->absent = FALSE;
+ m->overwriting = FALSE;
+ vm_page_unwire(m);
- if (page_list) {
- p = &(page_list[entry]);
- if(p->phys_addr && p->pageout && !m->pageout) {
- m->busy = TRUE;
- m->pageout = TRUE;
- vm_page_wire(m);
- } else if (page_list[entry].phys_addr &&
- !p->pageout && m->pageout &&
- !m->dump_cleaning) {
- m->pageout = FALSE;
- m->absent = FALSE;
- m->overwriting = FALSE;
- vm_page_unwire(m);
- PAGE_WAKEUP_DONE(m);
+ PAGE_WAKEUP_DONE(m);
+ }
+ page_list[entry].phys_addr = 0;
}
- page_list[entry].phys_addr = 0;
- }
- m->dump_cleaning = FALSE;
- if(m->laundry) {
- vm_pageout_throttle_up(m);
- }
- if(m->pageout) {
- m->cleaning = FALSE;
- m->pageout = FALSE;
-#if MACH_CLUSTER_STATS
- if (m->wanted) vm_pageout_target_collisions++;
-#endif
- if (pmap_disconnect(m->phys_page) & VM_MEM_MODIFIED)
- m->dirty = TRUE;
- else
- m->dirty = FALSE;
+ m->dump_cleaning = FALSE;
- if(m->dirty) {
- vm_page_unwire(m);/* reactivates */
+ if (m->laundry)
+ vm_pageout_throttle_up(m);
- if (upl->flags & UPL_PAGEOUT) {
- CLUSTER_STAT(vm_pageout_target_page_dirtied++;)
- VM_STAT(reactivations++);
- }
- PAGE_WAKEUP_DONE(m);
- } else {
- vm_page_free(m);/* clears busy, etc. */
-
- if (upl->flags & UPL_PAGEOUT) {
- CLUSTER_STAT(vm_pageout_target_page_freed++;)
-
- if (page_list[entry].dirty)
- VM_STAT(pageouts++);
- }
- }
- if (delayed_unlock++ > DELAYED_UNLOCK_LIMIT) {
- delayed_unlock = 0;
- vm_page_unlock_queues();
- }
- target_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- entry++;
- continue;
- }
+ if (m->pageout) {
+ m->cleaning = FALSE;
+ m->encrypted_cleaning = FALSE;
+ m->pageout = FALSE;
#if MACH_CLUSTER_STATS
- 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++;
-#else
- m->dirty = 0;
+ if (m->wanted) vm_pageout_target_collisions++;
#endif
+ m->dirty = FALSE;
+ if (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;
+ vm_cs_validated_resets++;
+ }
- if((m->busy) && (m->cleaning)) {
- /* the request_page_list case */
- if(m->absent) {
- m->absent = FALSE;
- if(shadow_object->absent_count == 1)
- vm_object_absent_release(shadow_object);
- else
- shadow_object->absent_count--;
- }
- m->overwriting = FALSE;
- m->busy = FALSE;
- m->dirty = 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(m->wire_count != 0);
- vm_page_unwire(m);/* reactivates */
- m->overwriting = FALSE;
- }
- m->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)
- m->precious = FALSE;
-
- if (flags & UPL_COMMIT_SET_DIRTY)
- m->dirty = TRUE;
-
- if (flags & UPL_COMMIT_INACTIVATE) {
- m->reference = FALSE;
- vm_page_deactivate(m);
- } else if (!m->active && !m->inactive) {
- if (m->reference)
- vm_page_activate(m);
- else
- vm_page_deactivate(m);
- }
-
- if (flags & UPL_COMMIT_ALLOW_ACCESS) {
- /*
- * We blocked access to the pages in this URL.
- * Clear the "busy" bit on this page before we
- * wake up any waiter.
- */
- m->busy = FALSE;
- }
-
- /*
- * Wakeup any thread waiting for the page to be un-cleaning.
- */
- PAGE_WAKEUP(m);
-
- if (delayed_unlock++ > DELAYED_UNLOCK_LIMIT) {
- delayed_unlock = 0;
- vm_page_unlock_queues();
- }
- }
- target_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- entry++;
- }
- if (delayed_unlock)
- vm_page_unlock_queues();
-
- occupied = 1;
-
- if (upl->flags & UPL_DEVICE_MEMORY) {
- occupied = 0;
- } else if (upl->flags & UPL_LITE) {
- int pg_num;
- int i;
- pg_num = upl->size/PAGE_SIZE;
- pg_num = (pg_num + 31) >> 5;
- occupied = 0;
- for(i= 0; i<pg_num; i++) {
- if(lite_list[i] != 0) {
- occupied = 1;
- break;
- }
- }
- } else {
- if(queue_empty(&upl->map_object->memq)) {
- occupied = 0;
- }
- }
-
- if(occupied == 0) {
- if(upl->flags & UPL_COMMIT_NOTIFY_EMPTY) {
- *empty = TRUE;
- }
- if(object == shadow_object)
- vm_object_paging_end(shadow_object);
- }
- vm_object_unlock(shadow_object);
- if (object != shadow_object)
- vm_object_unlock(object);
- upl_unlock(upl);
-
- return KERN_SUCCESS;
-}
-
-kern_return_t
-upl_abort_range(
- upl_t upl,
- upl_offset_t offset,
- upl_size_t size,
- int error,
- boolean_t *empty)
-{
- upl_size_t xfer_size = size;
- vm_object_t shadow_object;
- vm_object_t object = upl->map_object;
- vm_object_offset_t target_offset;
- int entry;
- wpl_array_t lite_list;
- int occupied;
- boolean_t shadow_internal;
-
- *empty = FALSE;
-
- if (upl == UPL_NULL)
- return KERN_INVALID_ARGUMENT;
-
- if (upl->flags & UPL_IO_WIRE) {
- return upl_commit_range(upl,
- offset, size, 0,
- NULL, 0, empty);
- }
-
- if(object->pageout) {
- shadow_object = object->shadow;
- } else {
- shadow_object = object;
- }
-
- upl_lock(upl);
- if(upl->flags & UPL_DEVICE_MEMORY) {
- xfer_size = 0;
- } else if ((offset + size) > upl->size) {
- upl_unlock(upl);
- return KERN_FAILURE;
- }
- if (object != shadow_object)
- vm_object_lock(object);
- vm_object_lock(shadow_object);
-
- shadow_internal = shadow_object->internal;
+ if (m->pmapped && (pmap_disconnect(m->phys_page) & VM_MEM_MODIFIED))
+ m->dirty = TRUE;
+
+ 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
+ */
+ vm_page_unwire(m);
+
+ if (upl->flags & UPL_PAGEOUT) {
+ CLUSTER_STAT(vm_pageout_target_page_dirtied++;)
+ VM_STAT_INCR(reactivations);
+ DTRACE_VM2(pgrec, int, 1, (uint64_t *), NULL);
+ }
+ PAGE_WAKEUP_DONE(m);
+ } else {
+ /*
+ * page has been successfully cleaned
+ * go ahead and free it for other use
+ */
- 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->object->internal) {
+ DTRACE_VM2(anonpgout, int, 1, (uint64_t *), NULL);
+ } else {
+ DTRACE_VM2(fspgout, int, 1, (uint64_t *), NULL);
+ }
- entry = offset/PAGE_SIZE;
- target_offset = (vm_object_offset_t)offset;
- while(xfer_size) {
- vm_page_t t,m;
+ vm_page_free(m);
+
+ if (upl->flags & UPL_PAGEOUT) {
+ CLUSTER_STAT(vm_pageout_target_page_freed++;)
- m = VM_PAGE_NULL;
- if(upl->flags & UPL_LITE) {
- int pg_num;
- 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));
- m = vm_page_lookup(shadow_object,
- target_offset + (upl->offset -
- shadow_object->paging_offset));
- }
- }
- if(object->pageout) {
- if ((t = vm_page_lookup(object, target_offset))
- != NULL) {
- t->pageout = FALSE;
- VM_PAGE_FREE(t);
- if(m == NULL) {
- m = vm_page_lookup(
- shadow_object,
- target_offset +
- object->shadow_offset);
+ if (page_list[entry].dirty) {
+ VM_STAT_INCR(pageouts);
+ DTRACE_VM2(pgout, int, 1, (uint64_t *), NULL);
+ pgpgout_count++;
+ }
+ }
}
- if(m != VM_PAGE_NULL)
- vm_object_paging_end(m->object);
+ goto commit_next_page;
}
- }
- if(m != VM_PAGE_NULL) {
- vm_page_lock_queues();
- if(m->absent) {
- boolean_t must_free = TRUE;
-
- /* 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;
- vm_object_absent_release(m->object);
- m->page_error = KERN_MEMORY_ERROR;
- m->error = 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;
- vm_object_absent_release(m->object);
- m->page_error = KERN_MEMORY_ERROR;
- m->error = TRUE;
- must_free = FALSE;
- }
+#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 (m->cs_validated && !m->cs_tainted) {
/*
- * 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.
+ * 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;
+ vm_cs_validated_resets++;
+ }
- m->cleaning = FALSE;
+ if ((m->busy) && (m->cleaning)) {
+ /*
+ * the request_page_list case
+ */
+ m->absent = FALSE;
m->overwriting = FALSE;
- PAGE_WAKEUP_DONE(m);
+ m->busy = 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(m->wire_count != 0);
+ vm_page_unwire(m);/* reactivates */
+ m->overwriting = FALSE;
+ }
+ 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)
+ m->precious = FALSE;
+
+ if (flags & UPL_COMMIT_SET_DIRTY)
+ m->dirty = TRUE;
- if (must_free == TRUE) {
- vm_page_free(m);
- } else {
- vm_page_activate(m);
- }
- vm_page_unlock_queues();
+ if ((flags & UPL_COMMIT_INACTIVATE) && !m->clustered && !m->speculative) {
+ vm_page_deactivate(m);
+ } else if (!m->active && !m->inactive && !m->speculative) {
- target_offset += PAGE_SIZE_64;
- xfer_size -= PAGE_SIZE;
- entry++;
- continue;
- }
- /*
- * Handle the trusted pager throttle.
- */
- if (m->laundry) {
- vm_pageout_throttle_up(m);
- }
- if(m->pageout) {
- assert(m->busy);
- assert(m->wire_count == 1);
- m->pageout = FALSE;
- vm_page_unwire(m);
+ if (m->clustered)
+ vm_page_speculate(m, TRUE);
+ else if (m->reference)
+ vm_page_activate(m);
+ else
+ vm_page_deactivate(m);
}
- m->dump_cleaning = FALSE;
- m->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) {
- vm_page_free(m);
- pmap_disconnect(m->phys_page);
- } else {
- PAGE_WAKEUP_DONE(m);
+ if (flags & UPL_COMMIT_ALLOW_ACCESS) {
+ /*
+ * We blocked access to the pages in this URL.
+ * Clear the "busy" bit on this page before we
+ * wake up any waiter.
+ */
+ m->busy = FALSE;
}
- vm_page_unlock_queues();
+ /*
+ * Wakeup any thread waiting for the page to be un-cleaning.
+ */
+ PAGE_WAKEUP(m);
}
+commit_next_page:
target_offset += PAGE_SIZE_64;
xfer_size -= PAGE_SIZE;
entry++;
+
+ if (delayed_unlock++ > UPL_DELAYED_UNLOCK_LIMIT) {
+ /*
+ * 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.
+ */
+ vm_object_unlock(shadow_object);
+ mutex_yield(&vm_page_queue_lock);
+
+ for (j = 0; ; j++) {
+ if (vm_object_lock_try(shadow_object))
+ break;
+ vm_page_unlock_queues();
+ mutex_pause(j);
+ vm_page_lock_queues();
+ }
+ delayed_unlock = 1;
+ }
}
+ if (delayed_unlock)
+ vm_page_unlock_queues();
+
occupied = 1;
+
if (upl->flags & UPL_DEVICE_MEMORY) {
occupied = 0;
} else if (upl->flags & UPL_LITE) {
int pg_num;
int i;
+
pg_num = upl->size/PAGE_SIZE;
pg_num = (pg_num + 31) >> 5;
occupied = 0;
- for(i= 0; i<pg_num; i++) {
- if(lite_list[i] != 0) {
+
+ for (i = 0; i < pg_num; i++) {
+ if (lite_list[i] != 0) {
occupied = 1;
break;
}
}
} else {
- if(queue_empty(&upl->map_object->memq)) {
+ if (queue_empty(&upl->map_object->memq))
occupied = 0;
- }
}
-
- if(occupied == 0) {
- if(upl->flags & UPL_COMMIT_NOTIFY_EMPTY) {
+ if (occupied == 0) {
+ if (upl->flags & UPL_COMMIT_NOTIFY_EMPTY)
*empty = TRUE;
- }
- if(object == shadow_object)
+
+ if (object == shadow_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_paging_end(shadow_object);
+ } else {
+ /*
+ * 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);
-
upl_unlock(upl);
+ if (pgpgout_count) {
+ DTRACE_VM2(pgpgout, int, pgpgout_count, (uint64_t *), NULL);
+ }
+
return KERN_SUCCESS;
}
kern_return_t
-upl_abort(
- upl_t upl,
- int error)
+upl_abort_range(
+ upl_t upl,
+ upl_offset_t offset,
+ upl_size_t size,
+ int error,
+ boolean_t *empty)
{
- vm_object_t object = NULL;
- vm_object_t shadow_object = NULL;
- vm_object_offset_t offset;
- vm_object_offset_t shadow_offset;
+ upl_size_t xfer_size;
+ vm_object_t shadow_object;
+ vm_object_t object;
vm_object_offset_t target_offset;
- upl_size_t i;
- wpl_array_t lite_list;
- vm_page_t t,m;
+ int entry;
+ wpl_array_t lite_list;
int occupied;
- boolean_t shadow_internal;
+ int delayed_unlock = 0;
+ int j;
+
+ *empty = FALSE;
if (upl == UPL_NULL)
return KERN_INVALID_ARGUMENT;
- if (upl->flags & UPL_IO_WIRE) {
- boolean_t empty;
- return upl_commit_range(upl,
- 0, upl->size, 0,
- NULL, 0, &empty);
- }
-
- upl_lock(upl);
- if(upl->flags & UPL_DEVICE_MEMORY) {
- upl_unlock(upl);
- return KERN_SUCCESS;
- }
-
- object = upl->map_object;
+ if ( (upl->flags & UPL_IO_WIRE) && !(error & UPL_ABORT_DUMP_PAGES) )
+ return upl_commit_range(upl, offset, size, 0, NULL, 0, empty);
- if (object == NULL) {
- panic("upl_abort: upl object is not backed by an object");
- upl_unlock(upl);
- return KERN_INVALID_ARGUMENT;
- }
+ if (upl->flags & UPL_DEVICE_MEMORY)
+ xfer_size = 0;
+ else if ((offset + size) <= upl->size)
+ xfer_size = size;
+ else
+ return KERN_FAILURE;
- if(object->pageout) {
- shadow_object = object->shadow;
- shadow_offset = object->shadow_offset;
- } else {
- shadow_object = object;
- shadow_offset = upl->offset - object->paging_offset;
- }
+ upl_lock(upl);
- if(upl->flags & UPL_INTERNAL) {
- lite_list = (wpl_array_t)
+ 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)
+ lite_list = (wpl_array_t)
(((uintptr_t)upl) + sizeof(struct upl));
}
- offset = 0;
+ object = upl->map_object;
- if (object != shadow_object)
+ if (upl->flags & UPL_SHADOWED) {
vm_object_lock(object);
- vm_object_lock(shadow_object);
+ shadow_object = object->shadow;
+ } else
+ shadow_object = object;
+
+ entry = offset/PAGE_SIZE;
+ target_offset = (vm_object_offset_t)offset;
+
+ /*
+ * 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.
+ */
+ for (j = 0; ; j++) {
+ vm_page_lock_queues();
+
+ if (vm_object_lock_try(shadow_object))
+ break;
+ vm_page_unlock_queues();
+ mutex_pause(j);
+ }
+ delayed_unlock = 1;
- shadow_internal = shadow_object->internal;
+ while (xfer_size) {
+ vm_page_t t, m;
- for(i = 0; i<(upl->size); i+=PAGE_SIZE, offset += PAGE_SIZE_64) {
m = VM_PAGE_NULL;
- target_offset = offset + shadow_offset;
- if(upl->flags & UPL_LITE) {
+
+ if (upl->flags & UPL_LITE) {
int pg_num;
- pg_num = offset/PAGE_SIZE;
- if(lite_list[pg_num>>5] & (1 << (pg_num & 31))) {
+ 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));
- m = vm_page_lookup(
- shadow_object, target_offset);
+
+ m = vm_page_lookup(shadow_object, target_offset +
+ (upl->offset - shadow_object->paging_offset));
}
}
- if(object->pageout) {
- if ((t = vm_page_lookup(object, offset)) != NULL) {
- t->pageout = FALSE;
- VM_PAGE_FREE(t);
- if(m == NULL) {
- m = vm_page_lookup(
- shadow_object, target_offset);
- }
- if(m != VM_PAGE_NULL)
- vm_object_paging_end(m->object);
+ 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(m != VM_PAGE_NULL) {
- vm_page_lock_queues();
- if(m->absent) {
+ if (m != VM_PAGE_NULL) {
+
+ if (m->absent) {
boolean_t must_free = TRUE;
- /* COPYOUT = FALSE case */
- /* check for error conditions which must */
- /* be passed back to the pages customer */
- if(error & UPL_ABORT_RESTART) {
+ 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;
- vm_object_absent_release(m->object);
- m->page_error = KERN_MEMORY_ERROR;
m->error = TRUE;
+ m->unusual = TRUE;
must_free = FALSE;
- } else if(error & UPL_ABORT_UNAVAILABLE) {
+ } else if (error & UPL_ABORT_UNAVAILABLE) {
m->restart = FALSE;
m->unusual = TRUE;
must_free = FALSE;
- } else if(error & UPL_ABORT_ERROR) {
+ } else if (error & UPL_ABORT_ERROR) {
m->restart = FALSE;
m->absent = FALSE;
- vm_object_absent_release(m->object);
- m->page_error = KERN_MEMORY_ERROR;
m->error = TRUE;
+ m->unusual = TRUE;
must_free = FALSE;
}
*/
m->cleaning = FALSE;
+ m->encrypted_cleaning = FALSE;
m->overwriting = FALSE;
PAGE_WAKEUP_DONE(m);
- if (must_free == TRUE) {
+ if (must_free == TRUE)
vm_page_free(m);
- } else {
+ else
vm_page_activate(m);
+ } else {
+ /*
+ * Handle the trusted pager throttle.
+ */
+ if (m->laundry)
+ vm_pageout_throttle_up(m);
+
+ if (m->pageout) {
+ assert(m->busy);
+ assert(m->wire_count == 1);
+ m->pageout = FALSE;
+ vm_page_unwire(m);
}
- vm_page_unlock_queues();
- continue;
- }
- /*
- * Handle the trusted pager throttle.
- */
- if (m->laundry) {
- vm_pageout_throttle_up(m);
- }
- if(m->pageout) {
- assert(m->busy);
- assert(m->wire_count == 1);
- m->pageout = FALSE;
- vm_page_unwire(m);
- }
- m->dump_cleaning = FALSE;
- m->cleaning = FALSE;
- m->overwriting = FALSE;
+ 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);
+ vm_external_state_clr(m->object->existence_map, m->offset);
#endif /* MACH_PAGEMAP */
- if(error & UPL_ABORT_DUMP_PAGES) {
- vm_page_free(m);
- pmap_disconnect(m->phys_page);
- } else {
- PAGE_WAKEUP_DONE(m);
+ if (error & UPL_ABORT_DUMP_PAGES) {
+ pmap_disconnect(m->phys_page);
+ vm_page_free(m);
+ } 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
+ */
+ vm_page_lru(m);
+ }
+ PAGE_WAKEUP_DONE(m);
+ }
}
- vm_page_unlock_queues();
}
+ if (delayed_unlock++ > UPL_DELAYED_UNLOCK_LIMIT) {
+ /*
+ * 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.
+ */
+ vm_object_unlock(shadow_object);
+ mutex_yield(&vm_page_queue_lock);
+
+ for (j = 0; ; j++) {
+ if (vm_object_lock_try(shadow_object))
+ break;
+ vm_page_unlock_queues();
+ mutex_pause(j);
+ vm_page_lock_queues();
+ }
+ delayed_unlock = 1;
+ }
+ target_offset += PAGE_SIZE_64;
+ xfer_size -= PAGE_SIZE;
+ entry++;
}
+ if (delayed_unlock)
+ vm_page_unlock_queues();
+
occupied = 1;
+
if (upl->flags & UPL_DEVICE_MEMORY) {
occupied = 0;
} else if (upl->flags & UPL_LITE) {
int pg_num;
- int j;
+ int i;
+
pg_num = upl->size/PAGE_SIZE;
pg_num = (pg_num + 31) >> 5;
occupied = 0;
- for(j= 0; j<pg_num; j++) {
- if(lite_list[j] != 0) {
+
+ for (i = 0; i < pg_num; i++) {
+ if (lite_list[i] != 0) {
occupied = 1;
break;
}
}
} else {
- if(queue_empty(&upl->map_object->memq)) {
+ if (queue_empty(&upl->map_object->memq))
occupied = 0;
- }
}
+ if (occupied == 0) {
+ if (upl->flags & UPL_COMMIT_NOTIFY_EMPTY)
+ *empty = TRUE;
- if(occupied == 0) {
- if(object == shadow_object)
+ if (object == shadow_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_paging_end(shadow_object);
+ } else {
+ /*
+ * 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);
-
upl_unlock(upl);
+
return KERN_SUCCESS;
}
+
+kern_return_t
+upl_abort(
+ upl_t upl,
+ int error)
+{
+ boolean_t empty;
+
+ return upl_abort_range(upl, 0, upl->size, error, &empty);
+}
+
+
/* an option on commit should be wire */
kern_return_t
upl_commit(
upl_page_info_t *page_list,
mach_msg_type_number_t count)
{
- if (upl == UPL_NULL)
- return KERN_INVALID_ARGUMENT;
-
- if(upl->flags & (UPL_LITE | UPL_IO_WIRE)) {
- boolean_t empty;
- return upl_commit_range(upl, 0, upl->size, 0,
- page_list, count, &empty);
- }
-
- if (count == 0)
- page_list = NULL;
-
- upl_lock(upl);
- if (upl->flags & UPL_DEVICE_MEMORY)
- page_list = NULL;
-
- if (upl->flags & UPL_ENCRYPTED) {
- /*
- * ENCRYPTED SWAP:
- * This UPL was encrypted, but we don't need
- * to decrypt here. We'll decrypt each page
- * later, on demand, as soon as someone needs
- * to access the page's contents.
- */
- }
-
- if ((upl->flags & UPL_CLEAR_DIRTY) ||
- (upl->flags & UPL_PAGE_SYNC_DONE) || page_list) {
- vm_object_t shadow_object = upl->map_object->shadow;
- vm_object_t object = upl->map_object;
- vm_object_offset_t target_offset;
- upl_size_t xfer_end;
- int entry;
-
- vm_page_t t, m;
- upl_page_info_t *p;
-
- if (object != shadow_object)
- vm_object_lock(object);
- vm_object_lock(shadow_object);
-
- entry = 0;
- target_offset = object->shadow_offset;
- xfer_end = upl->size + object->shadow_offset;
-
- while(target_offset < xfer_end) {
-
- if ((t = vm_page_lookup(object,
- target_offset - object->shadow_offset))
- == NULL) {
- target_offset += PAGE_SIZE_64;
- entry++;
- continue;
- }
-
- m = vm_page_lookup(shadow_object, target_offset);
- if(m != VM_PAGE_NULL) {
- /*
- * ENCRYPTED SWAP:
- * If this page was encrypted, we
- * don't need to decrypt it here.
- * We'll decrypt it later, on demand,
- * as soon as someone needs to access
- * its contents.
- */
-
- if (upl->flags & UPL_CLEAR_DIRTY) {
- pmap_clear_modify(m->phys_page);
- m->dirty = 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)
- m->precious = FALSE;
-
- if(page_list) {
- p = &(page_list[entry]);
- if(page_list[entry].phys_addr &&
- p->pageout && !m->pageout) {
- vm_page_lock_queues();
- m->busy = TRUE;
- m->pageout = TRUE;
- vm_page_wire(m);
- vm_page_unlock_queues();
- } else if (page_list[entry].phys_addr &&
- !p->pageout && m->pageout &&
- !m->dump_cleaning) {
- vm_page_lock_queues();
- m->pageout = FALSE;
- m->absent = FALSE;
- m->overwriting = FALSE;
- vm_page_unwire(m);
- PAGE_WAKEUP_DONE(m);
- vm_page_unlock_queues();
- }
- page_list[entry].phys_addr = 0;
- }
- }
- target_offset += PAGE_SIZE_64;
- entry++;
- }
- vm_object_unlock(shadow_object);
- if (object != shadow_object)
- vm_object_unlock(object);
+ boolean_t empty;
- }
- if (upl->flags & UPL_DEVICE_MEMORY) {
- vm_object_lock(upl->map_object->shadow);
- if(upl->map_object == upl->map_object->shadow)
- vm_object_paging_end(upl->map_object->shadow);
- vm_object_unlock(upl->map_object->shadow);
- }
- upl_unlock(upl);
- return KERN_SUCCESS;
+ return upl_commit_range(upl, 0, upl->size, 0, page_list, count, &empty);
}
-
kern_return_t
vm_object_iopl_request(
vm_object_t object,
int cntrl_flags)
{
vm_page_t dst_page;
- vm_object_offset_t dst_offset = offset;
- upl_size_t xfer_size = size;
+ 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 page_field_size;
int delayed_unlock = 0;
int no_zero_fill = FALSE;
- vm_page_t alias_page = NULL;
+ u_int32_t psize;
kern_return_t ret;
vm_prot_t prot;
+ struct vm_object_fault_info fault_info;
if (cntrl_flags & ~UPL_VALID_FLAGS) {
*/
return KERN_INVALID_VALUE;
}
+ if (vm_lopage_poolsize == 0)
+ 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 (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 (cntrl_flags & UPL_ENCRYPT) {
/*
*/
assert(! (cntrl_flags & UPL_ENCRYPT));
}
-
if (cntrl_flags & UPL_NOZEROFILL)
no_zero_fill = TRUE;
else
prot = VM_PROT_READ | VM_PROT_WRITE;
- if(((size/page_size) > MAX_UPL_TRANSFER) && !object->phys_contiguous) {
+ if (((size/page_size) > MAX_UPL_TRANSFER) && !object->phys_contiguous)
size = MAX_UPL_TRANSFER * page_size;
- }
- if(cntrl_flags & UPL_SET_INTERNAL)
- if(page_list_count != NULL)
+ if (cntrl_flags & UPL_SET_INTERNAL) {
+ if (page_list_count != NULL)
*page_list_count = MAX_UPL_TRANSFER;
- 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;
+ }
+ 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;
+
+ if ((!object->internal) && (object->paging_offset != 0))
+ panic("vm_object_iopl_request: external object with non-zero paging offset\n");
+
+
+ if (object->phys_contiguous)
+ psize = PAGE_SIZE;
+ else
+ psize = size;
+
+ if (cntrl_flags & UPL_SET_INTERNAL) {
+ upl = upl_create(UPL_CREATE_INTERNAL | UPL_CREATE_LITE, UPL_IO_WIRE, psize);
- if((!object->internal) && (object->paging_offset != 0))
- panic("vm_object_upl_request: vnode object with non-zero paging offset\n");
+ 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)));
+ } else {
+ upl = upl_create(UPL_CREATE_LITE, UPL_IO_WIRE, psize);
- if(object->phys_contiguous) {
- /* No paging operations are possible against this memory */
- /* and so no need for map object, ever */
- cntrl_flags |= UPL_SET_LITE;
+ lite_list = (wpl_array_t) (((uintptr_t)upl) + sizeof(struct upl));
}
+ if (user_page_list)
+ user_page_list[0].device = FALSE;
+ *upl_ptr = upl;
- if(upl_ptr) {
- if(cntrl_flags & UPL_SET_INTERNAL) {
- if(cntrl_flags & UPL_SET_LITE) {
- upl = upl_create(
- UPL_CREATE_INTERNAL | UPL_CREATE_LITE,
- 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)));
- page_field_size = ((size/PAGE_SIZE) + 7) >> 3;
- page_field_size =
- (page_field_size + 3) & 0xFFFFFFFC;
- bzero((char *)lite_list, page_field_size);
- upl->flags =
- UPL_LITE | UPL_INTERNAL | UPL_IO_WIRE;
- } else {
- upl = upl_create(UPL_CREATE_INTERNAL, size);
- user_page_list = (upl_page_info_t *)
- (((uintptr_t)upl)
- + sizeof(struct upl));
- upl->flags = UPL_INTERNAL | UPL_IO_WIRE;
- }
- } else {
- if(cntrl_flags & UPL_SET_LITE) {
- upl = upl_create(UPL_CREATE_LITE, size);
- lite_list = (wpl_array_t)
- (((uintptr_t)upl) + sizeof(struct upl));
- page_field_size = ((size/PAGE_SIZE) + 7) >> 3;
- page_field_size =
- (page_field_size + 3) & 0xFFFFFFFC;
- bzero((char *)lite_list, page_field_size);
- upl->flags = UPL_LITE | UPL_IO_WIRE;
- } else {
- upl = upl_create(UPL_CREATE_EXTERNAL, size);
- upl->flags = UPL_IO_WIRE;
- }
- }
+ upl->map_object = object;
+ upl->size = size;
+
+ vm_object_lock(object);
+ vm_object_paging_begin(object);
+ /*
+ * paging in progress also protects the paging_offset
+ */
+ upl->offset = offset + object->paging_offset;
- if(object->phys_contiguous) {
- upl->map_object = object;
- /* don't need any shadow mappings for this one */
- /* since it is already I/O memory */
- upl->flags |= UPL_DEVICE_MEMORY;
+ if (object->phys_contiguous) {
+#ifdef UPL_DEBUG
+ queue_enter(&object->uplq, upl, upl_t, uplq);
+#endif /* UPL_DEBUG */
- vm_object_lock(object);
- vm_object_paging_begin(object);
- vm_object_unlock(object);
+ vm_object_unlock(object);
- /* paging in progress also protects the paging_offset */
- upl->offset = offset + object->paging_offset;
- upl->size = size;
- *upl_ptr = upl;
- if(user_page_list) {
- user_page_list[0].phys_addr =
- (offset + object->shadow_offset)>>PAGE_SHIFT;
- user_page_list[0].device = TRUE;
- }
+ /*
+ * don't need any shadow mappings for this one
+ * since it is already I/O memory
+ */
+ upl->flags |= UPL_DEVICE_MEMORY;
- if(page_list_count != NULL) {
- if (upl->flags & UPL_INTERNAL) {
- *page_list_count = 0;
- } else {
- *page_list_count = 1;
- }
- }
- return KERN_SUCCESS;
+ upl->highest_page = (offset + object->shadow_offset + size - 1)>>PAGE_SHIFT;
+
+ if (user_page_list) {
+ user_page_list[0].phys_addr = (offset + object->shadow_offset)>>PAGE_SHIFT;
+ user_page_list[0].device = TRUE;
}
- 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);
- 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->shadow_offset = offset;
- upl->map_object->wimg_bits = object->wimg_bits;
- vm_object_unlock(upl->map_object);
+ if (page_list_count != NULL) {
+ if (upl->flags & UPL_INTERNAL)
+ *page_list_count = 0;
+ else
+ *page_list_count = 1;
}
+ return KERN_SUCCESS;
}
- vm_object_lock(object);
- vm_object_paging_begin(object);
+ /*
+ * Protect user space from future COW operations
+ */
+ object->true_share = TRUE;
- if (!object->phys_contiguous) {
- /* Protect user space from future COW operations */
- object->true_share = TRUE;
- if (object->copy_strategy == MEMORY_OBJECT_COPY_SYMMETRIC)
- object->copy_strategy = MEMORY_OBJECT_COPY_DELAY;
- }
+ if (object->copy_strategy == MEMORY_OBJECT_COPY_SYMMETRIC)
+ object->copy_strategy = MEMORY_OBJECT_COPY_DELAY;
- /* we can lock the upl offset now that paging_in_progress is set */
- if(upl_ptr) {
- upl->size = size;
- upl->offset = offset + object->paging_offset;
- *upl_ptr = upl;
#ifdef UPL_DEBUG
- queue_enter(&object->uplq, upl, upl_t, uplq);
+ queue_enter(&object->uplq, upl, upl_t, uplq);
#endif /* UPL_DEBUG */
- }
if (cntrl_flags & UPL_BLOCK_ACCESS) {
/*
*/
upl->flags |= UPL_ACCESS_BLOCKED;
}
-
entry = 0;
+
+ xfer_size = size;
+ dst_offset = offset;
+
+ 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;
+
while (xfer_size) {
- if((alias_page == NULL) && !(cntrl_flags & UPL_SET_LITE)) {
- if (delayed_unlock) {
- delayed_unlock = 0;
- vm_page_unlock_queues();
- }
- vm_object_unlock(object);
- VM_PAGE_GRAB_FICTITIOUS(alias_page);
- vm_object_lock(object);
- }
+ vm_fault_return_t result;
+ int pg_num;
+
dst_page = vm_page_lookup(object, dst_offset);
/*
(dst_page->unusual && (dst_page->error ||
dst_page->restart ||
dst_page->absent ||
- dst_page->fictitious ||
- (prot & dst_page->page_lock)))) {
- vm_fault_return_t result;
+ dst_page->fictitious))) {
+
do {
vm_page_t top_page;
kern_return_t error_code;
int interruptible;
- vm_object_offset_t lo_offset = offset;
- vm_object_offset_t hi_offset = offset + size;
-
-
if (delayed_unlock) {
delayed_unlock = 0;
vm_page_unlock_queues();
}
-
- if(cntrl_flags & UPL_SET_INTERRUPTIBLE) {
+ if (cntrl_flags & UPL_SET_INTERRUPTIBLE)
interruptible = THREAD_ABORTSAFE;
- } else {
+ else
interruptible = THREAD_UNINT;
- }
+
+ fault_info.interruptible = interruptible;
+ fault_info.cluster_size = xfer_size;
result = vm_fault_page(object, dst_offset,
- prot | VM_PROT_WRITE, FALSE,
- interruptible,
- lo_offset, hi_offset,
- VM_BEHAVIOR_SEQUENTIAL,
- &prot, &dst_page, &top_page,
- (int *)0,
- &error_code, no_zero_fill, FALSE, NULL, 0);
-
- switch(result) {
+ prot | VM_PROT_WRITE, FALSE,
+ &prot, &dst_page, &top_page,
+ (int *)0,
+ &error_code, no_zero_fill,
+ FALSE, &fault_info);
+
+ switch (result) {
+
case VM_FAULT_SUCCESS:
PAGE_WAKEUP_DONE(dst_page);
-
/*
* Release paging references and
* top-level placeholder page, if any.
*/
-
- if(top_page != VM_PAGE_NULL) {
+ if (top_page != VM_PAGE_NULL) {
vm_object_t local_object;
- local_object =
- top_page->object;
- if(top_page->object
- != dst_page->object) {
- vm_object_lock(
- local_object);
+
+ local_object = top_page->object;
+
+ 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);
+ 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(local_object);
}
}
-
break;
-
case VM_FAULT_RETRY:
vm_object_lock(object);
vm_object_paging_begin(object);
case VM_FAULT_FICTITIOUS_SHORTAGE:
vm_page_more_fictitious();
+
vm_object_lock(object);
vm_object_paging_begin(object);
break;
case VM_FAULT_INTERRUPTED:
error_code = MACH_SEND_INTERRUPTED;
case VM_FAULT_MEMORY_ERROR:
- ret = (error_code ? error_code:
- KERN_MEMORY_ERROR);
+ ret = (error_code ? error_code: KERN_MEMORY_ERROR);
+
vm_object_lock(object);
- for(; offset < dst_offset;
- offset += PAGE_SIZE) {
- dst_page = vm_page_lookup(
- object, offset);
- if(dst_page == VM_PAGE_NULL)
- panic("vm_object_iopl_request: Wired pages missing. \n");
- vm_page_lock_queues();
- vm_page_unwire(dst_page);
- vm_page_unlock_queues();
- VM_STAT(reactivations++);
- }
- vm_object_unlock(object);
- upl_destroy(upl);
- return ret;
+ vm_object_paging_begin(object);
+ goto return_err;
+ }
+ } while (result != VM_FAULT_SUCCESS);
+ }
+
+ if ( (cntrl_flags & UPL_NEED_32BIT_ADDR) &&
+ dst_page->phys_page >= (max_valid_dma_address >> PAGE_SHIFT) ) {
+ vm_page_t low_page;
+ int refmod;
+
+ /*
+ * support devices that can't DMA above 32 bits
+ * by substituting pages from a pool of low address
+ * memory for any pages we find above the 4G mark
+ * can't substitute if the page is already wired because
+ * we don't know whether that physical address has been
+ * handed out to some other 64 bit capable DMA device to use
+ */
+ if (dst_page->wire_count) {
+ ret = KERN_PROTECTION_FAILURE;
+ goto return_err;
+ }
+ if (delayed_unlock) {
+ delayed_unlock = 0;
+ vm_page_unlock_queues();
}
- } while ((result != VM_FAULT_SUCCESS)
- || (result == VM_FAULT_INTERRUPTED));
+ low_page = vm_page_grablo();
+
+ if (low_page == VM_PAGE_NULL) {
+ ret = KERN_RESOURCE_SHORTAGE;
+ goto return_err;
+ }
+ /*
+ * from here until the vm_page_replace completes
+ * we musn't drop the object lock... we don't
+ * want anyone refaulting this page in and using
+ * 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;
+
+ vm_page_lock_queues();
+ vm_page_replace(low_page, object, dst_offset);
+ /*
+ * keep the queue lock since we're going to
+ * need it immediately
+ */
+ delayed_unlock = 1;
+
+ dst_page = low_page;
+ /*
+ * vm_page_grablo returned the page marked
+ * BUSY... we don't need a PAGE_WAKEUP_DONE
+ * here, because we've never dropped the object lock
+ */
+ dst_page->busy = FALSE;
}
if (delayed_unlock == 0)
vm_page_lock_queues();
+
vm_page_wire(dst_page);
if (cntrl_flags & UPL_BLOCK_ACCESS) {
assert(!dst_page->fictitious);
dst_page->busy = TRUE;
}
+ pg_num = (dst_offset-offset)/PAGE_SIZE;
+ lite_list[pg_num>>5] |= 1 << (pg_num & 31);
- if (upl_ptr) {
- if (cntrl_flags & UPL_SET_LITE) {
- int pg_num;
- pg_num = (dst_offset-offset)/PAGE_SIZE;
- lite_list[pg_num>>5] |= 1 << (pg_num & 31);
- } else {
- /*
- * 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;
- alias_page->phys_page = dst_page->phys_page;
- vm_page_wire(alias_page);
+ /*
+ * expect the page to be used
+ * page queues lock must be held to set 'reference'
+ */
+ dst_page->reference = TRUE;
- vm_page_insert(alias_page,
- upl->map_object, size - xfer_size);
- assert(!alias_page->wanted);
- alias_page->busy = FALSE;
- alias_page->absent = FALSE;
- }
+ if (!(cntrl_flags & UPL_COPYOUT_FROM))
+ dst_page->dirty = TRUE;
- /* expect the page to be used */
- dst_page->reference = TRUE;
-
- if (!(cntrl_flags & UPL_COPYOUT_FROM))
- dst_page->dirty = TRUE;
- alias_page = NULL;
-
- if (user_page_list) {
- user_page_list[entry].phys_addr
- = dst_page->phys_page;
- user_page_list[entry].dirty =
- dst_page->dirty;
- user_page_list[entry].pageout =
- dst_page->pageout;
- user_page_list[entry].absent =
- dst_page->absent;
- user_page_list[entry].precious =
- dst_page->precious;
- }
+ 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].dirty = dst_page->dirty;
+ user_page_list[entry].pageout = dst_page->pageout;
+ user_page_list[entry].absent = dst_page->absent;
+ user_page_list[entry].precious = dst_page->precious;
+
+ if (dst_page->clustered == TRUE)
+ user_page_list[entry].speculative = dst_page->speculative;
+ else
+ user_page_list[entry].speculative = FALSE;
}
- if (delayed_unlock++ > DELAYED_UNLOCK_LIMIT) {
- delayed_unlock = 0;
- vm_page_unlock_queues();
+ /*
+ * someone is explicitly grabbing this page...
+ * update clustered and speculative state
+ *
+ */
+ VM_PAGE_CONSUME_CLUSTERED(dst_page);
+
+ if (delayed_unlock++ > UPL_DELAYED_UNLOCK_LIMIT) {
+ mutex_yield(&vm_page_queue_lock);
+ delayed_unlock = 1;
}
entry++;
dst_offset += PAGE_SIZE_64;
if (delayed_unlock)
vm_page_unlock_queues();
- if (upl->flags & UPL_INTERNAL) {
- if(page_list_count != NULL)
+ if (page_list_count != NULL) {
+ if (upl->flags & UPL_INTERNAL)
*page_list_count = 0;
- } else if (*page_list_count > entry) {
- if(page_list_count != NULL)
+ else if (*page_list_count > entry)
*page_list_count = entry;
}
-
- if (alias_page != NULL) {
- vm_page_lock_queues();
- vm_page_free(alias_page);
- vm_page_unlock_queues();
- }
-
vm_object_unlock(object);
if (cntrl_flags & UPL_BLOCK_ACCESS) {
vm_object_pmap_protect(object, offset, (vm_object_size_t)size,
PMAP_NULL, 0, VM_PROT_NONE);
}
-
return KERN_SUCCESS;
+
+return_err:
+ if (delayed_unlock)
+ vm_page_unlock_queues();
+
+ for (; offset < dst_offset; offset += PAGE_SIZE) {
+ dst_page = vm_page_lookup(object, offset);
+
+ if (dst_page == VM_PAGE_NULL)
+ panic("vm_object_iopl_request: Wired pages missing. \n");
+
+ vm_page_lockspin_queues();
+ vm_page_unwire(dst_page);
+ vm_page_unlock_queues();
+
+ VM_STAT_INCR(reactivations);
+ }
+ vm_object_paging_end(object);
+ vm_object_unlock(object);
+ upl_destroy(upl);
+
+ return ret;
}
kern_return_t
* Make each UPL point to the correct VM object, i.e. the
* object holding the pages that the UPL refers to...
*/
+#ifdef UPL_DEBUG
+ queue_remove(&object1->uplq, upl1, upl_t, uplq);
+ queue_remove(&object2->uplq, upl2, upl_t, uplq);
+#endif
upl1->map_object = object2;
upl2->map_object = object1;
+#ifdef UPL_DEBUG
+ queue_enter(&object1->uplq, upl2, upl_t, uplq);
+ queue_enter(&object2->uplq, upl1, upl_t, uplq);
+#endif
}
done:
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;
+void
+vm_paging_map_init(void)
+{
+ kern_return_t kr;
+ vm_map_offset_t page_map_offset;
+ vm_map_entry_t map_entry;
+
+ assert(vm_paging_base_address == 0);
+
+ /*
+ * Initialize our pool of pre-allocated kernel
+ * virtual addresses.
+ */
+ page_map_offset = 0;
+ kr = vm_map_find_space(kernel_map,
+ &page_map_offset,
+ VM_PAGING_NUM_PAGES * PAGE_SIZE,
+ 0,
+ 0,
+ &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 - VM_MIN_KERNEL_ADDRESS;
+ vm_object_reference(kernel_object);
+ vm_map_unlock(kernel_map);
+
+ assert(vm_paging_base_address == 0);
+ vm_paging_base_address = page_map_offset;
+}
+
/*
* ENCRYPTED SWAP:
* vm_paging_map_object:
* kernel virtual addresses, if possible.
* Context:
* The VM object is locked. This lock will get
- * dropped and re-acquired though.
+ * 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
+ * it from being reclaimed.
*/
kern_return_t
vm_paging_map_object(
vm_page_t page,
vm_object_t object,
vm_object_offset_t offset,
- vm_map_size_t *size)
+ vm_map_size_t *size,
+ boolean_t can_unlock_object)
{
kern_return_t kr;
vm_map_offset_t page_map_offset;
vm_map_size_t map_size;
vm_object_offset_t object_offset;
-#ifdef __ppc__
int i;
- vm_map_entry_t map_entry;
-#endif /* __ppc__ */
-#ifdef __ppc__
if (page != VM_PAGE_NULL && *size == PAGE_SIZE) {
+ assert(page->busy);
/*
- * Optimization for the PowerPC.
* Use one of the pre-allocated kernel virtual addresses
* and just enter the VM page in the kernel address space
* at that virtual address.
*/
- vm_object_unlock(object);
simple_lock(&vm_paging_lock);
- if (vm_paging_base_address == 0) {
- /*
- * Initialize our pool of pre-allocated kernel
- * virtual addresses.
- */
- simple_unlock(&vm_paging_lock);
- page_map_offset = 0;
- kr = vm_map_find_space(kernel_map,
- &page_map_offset,
- VM_PAGING_NUM_PAGES * PAGE_SIZE,
- 0,
- &map_entry);
- if (kr != KERN_SUCCESS) {
- panic("vm_paging_map_object: "
- "kernel_map full\n");
- }
- map_entry->object.vm_object = kernel_object;
- map_entry->offset =
- page_map_offset - VM_MIN_KERNEL_ADDRESS;
- vm_object_reference(kernel_object);
- vm_map_unlock(kernel_map);
-
- simple_lock(&vm_paging_lock);
- if (vm_paging_base_address != 0) {
- /* someone raced us and won: undo */
- simple_unlock(&vm_paging_lock);
- kr = vm_map_remove(kernel_map,
- page_map_offset,
- page_map_offset +
- (VM_PAGING_NUM_PAGES
- * PAGE_SIZE),
- VM_MAP_NO_FLAGS);
- assert(kr == KERN_SUCCESS);
- simple_lock(&vm_paging_lock);
- } else {
- vm_paging_base_address = page_map_offset;
- }
- }
-
/*
* Try and find an available kernel virtual address
* from our pre-allocated pool.
*/
page_map_offset = 0;
- 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);
+ for (;;) {
+ 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);
+ break;
+ }
+ }
+ if (page_map_offset != 0) {
+ /* found a space to map our page ! */
+ break;
+ }
+
+ if (can_unlock_object) {
+ /*
+ * If we can afford to unlock the VM object,
+ * let's take the slow path now...
+ */
break;
}
+ /*
+ * We can't afford to unlock the VM object, so
+ * let's wait for a space to become available...
+ */
+ vm_paging_page_waiter_total++;
+ vm_paging_page_waiter++;
+ thread_sleep_fast_usimple_lock(&vm_paging_page_waiter,
+ &vm_paging_lock,
+ THREAD_UNINT);
+ vm_paging_page_waiter--;
+ /* ... and try again */
}
if (page_map_offset != 0) {
}
vm_paging_page_inuse[i] = TRUE;
simple_unlock(&vm_paging_lock);
- pmap_map_block(kernel_pmap,
- page_map_offset,
- page->phys_page,
- 1, /* Size is number of 4k pages */
- VM_PROT_DEFAULT,
- ((int) page->object->wimg_bits &
- VM_WIMG_MASK),
- 0);
+
+ if (page->pmapped == FALSE) {
+ pmap_sync_page_data_phys(page->phys_page);
+ }
+ page->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
+ * vm_object_pmap_protect() call...
+ */
+ PMAP_ENTER(kernel_pmap,
+ page_map_offset,
+ page,
+ VM_PROT_DEFAULT,
+ ((int) page->object->wimg_bits &
+ VM_WIMG_MASK),
+ TRUE);
vm_paging_objects_mapped++;
vm_paging_pages_mapped++;
*address = page_map_offset;
- vm_object_lock(object);
/* all done and mapped, ready to use ! */
return KERN_SUCCESS;
*/
vm_paging_no_kernel_page++;
simple_unlock(&vm_paging_lock);
- vm_object_lock(object);
}
-#endif /* __ppc__ */
+
+ if (! can_unlock_object) {
+ return KERN_NOT_SUPPORTED;
+ }
object_offset = vm_object_trunc_page(offset);
map_size = vm_map_round_page(*size);
* in the kernel_map
*/
- /* don't go beyond the object's end... */
- if (object_offset >= object->size) {
- map_size = 0;
- } else if (map_size > object->size - offset) {
- map_size = object->size - offset;
- }
-
vm_object_reference_locked(object); /* for the map entry */
vm_object_unlock(object);
*address = 0;
*size = 0;
vm_object_deallocate(object); /* for the map entry */
+ vm_object_lock(object);
return kr;
}
* Enter the mapped pages in the page table now.
*/
vm_object_lock(object);
+ /*
+ * VM object must be kept locked from before PMAP_ENTER()
+ * until after the kernel is done accessing the page(s).
+ * Otherwise, the pmap mappings in the kernel could be
+ * undone by a call to vm_object_pmap_protect().
+ */
+
for (page_map_offset = 0;
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) {
- panic("vm_paging_map_object: no page !?");
+ printf("vm_paging_map_object: no page !?");
+ vm_object_unlock(object);
+ kr = vm_map_remove(kernel_map, *address, *size,
+ VM_MAP_NO_FLAGS);
+ assert(kr == KERN_SUCCESS);
+ *address = 0;
+ *size = 0;
+ vm_object_lock(object);
+ return KERN_MEMORY_ERROR;
}
- if (page->no_isync == TRUE) {
+ if (page->pmapped == FALSE) {
pmap_sync_page_data_phys(page->phys_page);
}
+ page->pmapped = TRUE;
+ page->wpmapped = TRUE;
cache_attr = ((unsigned int) object->wimg_bits) & VM_WIMG_MASK;
+ //assert(pmap_verify_free(page->phys_page));
PMAP_ENTER(kernel_pmap,
*address + page_map_offset,
page,
VM_PROT_DEFAULT,
cache_attr,
- FALSE);
+ TRUE);
}
vm_paging_objects_mapped_slow++;
vm_map_offset_t end)
{
kern_return_t kr;
-#ifdef __ppc__
int i;
-#endif /* __ppc__ */
- if ((vm_paging_base_address != 0) &&
- ((start < vm_paging_base_address) ||
- (end > (vm_paging_base_address
- + (VM_PAGING_NUM_PAGES * PAGE_SIZE))))) {
+ if ((vm_paging_base_address == 0) ||
+ (start < vm_paging_base_address) ||
+ (end > (vm_paging_base_address
+ + (VM_PAGING_NUM_PAGES * PAGE_SIZE)))) {
/*
* We didn't use our pre-allocated pool of
* kernel virtual address. Deallocate the
* pre-allocated pool. Put it back in the pool
* for next time.
*/
-#ifdef __ppc__
assert(end - start == PAGE_SIZE);
i = (start - vm_paging_base_address) >> PAGE_SHIFT;
/* undo the pmap mapping */
- mapping_remove(kernel_pmap, start);
+ 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);
-#endif /* __ppc__ */
}
}
+#if CRYPTO
/*
* Encryption data.
* "iv" is the "initial vector". Ideally, we want to
vm_page_t page,
vm_map_offset_t kernel_mapping_offset)
{
- int clear_refmod = 0;
kern_return_t kr;
- boolean_t page_was_referenced;
- boolean_t page_was_modified;
vm_map_size_t kernel_mapping_size;
vm_offset_t kernel_vaddr;
union {
ASSERT_PAGE_DECRYPTED(page);
/*
- * Gather the "reference" and "modified" status of the page.
- * We'll restore these values after the encryption, so that
- * the encryption is transparent to the rest of the system
- * and doesn't impact the VM's LRU logic.
+ * 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)...
*/
- page_was_referenced =
- (page->reference || pmap_is_referenced(page->phys_page));
- page_was_modified =
- (page->dirty || pmap_is_modified(page->phys_page));
+ vm_object_paging_begin(page->object);
if (kernel_mapping_offset == 0) {
/*
page,
page->object,
page->offset,
- &kernel_mapping_size);
+ &kernel_mapping_size,
+ FALSE);
if (kr != KERN_SUCCESS) {
panic("vm_page_encrypt: "
"could not map page in kernel: 0x%x\n",
encrypt_iv.vm.paging_offset =
page->object->paging_offset + page->offset;
- vm_object_unlock(page->object);
-
/* encrypt the "initial vector" */
aes_encrypt_cbc((const unsigned char *) &encrypt_iv.aes_iv[0],
swap_crypt_null_iv,
vm_page_encrypt_counter++;
- vm_object_lock(page->object);
-
/*
* Unmap the page from the kernel's address space,
* if we had to map it ourselves. Otherwise, let
}
/*
- * Restore the "reference" and "modified" bits.
+ * 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()).
*/
- if (! page_was_referenced) {
- clear_refmod |= VM_MEM_REFERENCED;
- page->reference = FALSE;
- }
- if (! page_was_modified) {
- clear_refmod |= VM_MEM_MODIFIED;
- page->dirty = FALSE;
- }
- if (clear_refmod)
- pmap_clear_refmod(page->phys_page, clear_refmod);
+ pmap_clear_refmod(page->phys_page, VM_MEM_REFERENCED | VM_MEM_MODIFIED);
page->encrypted = TRUE;
+
+ vm_object_paging_end(page->object);
}
/*
vm_page_t page,
vm_map_offset_t kernel_mapping_offset)
{
- int clear_refmod = 0;
kern_return_t kr;
vm_map_size_t kernel_mapping_size;
vm_offset_t kernel_vaddr;
- boolean_t page_was_referenced;
union {
unsigned char aes_iv[AES_BLOCK_SIZE];
struct {
assert(page->encrypted);
/*
- * Gather the "reference" status of the page.
- * We'll restore its value after the decryption, so that
- * the decryption is transparent to the rest of the system
- * and doesn't impact the VM's LRU logic.
+ * 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)...
*/
- page_was_referenced =
- (page->reference || pmap_is_referenced(page->phys_page));
+ vm_object_paging_begin(page->object);
if (kernel_mapping_offset == 0) {
/*
page,
page->object,
page->offset,
- &kernel_mapping_size);
+ &kernel_mapping_size,
+ FALSE);
if (kr != KERN_SUCCESS) {
panic("vm_page_decrypt: "
- "could not map page in kernel: 0x%x\n");
+ "could not map page in kernel: 0x%x\n",
+ kr);
}
} else {
kernel_mapping_size = 0;
decrypt_iv.vm.paging_offset =
page->object->paging_offset + page->offset;
- vm_object_unlock(page->object);
-
/* encrypt the "initial vector" */
aes_encrypt_cbc((const unsigned char *) &decrypt_iv.aes_iv[0],
swap_crypt_null_iv,
&swap_crypt_ctx.decrypt);
vm_page_decrypt_counter++;
- vm_object_lock(page->object);
-
/*
* Unmap the page from the kernel's address space,
* if we had to map it ourselves. Otherwise, let
* and the decryption doesn't count.
*/
page->dirty = FALSE;
- clear_refmod = VM_MEM_MODIFIED;
-
- /* restore the "reference" bit */
- if (! page_was_referenced) {
- page->reference = FALSE;
- clear_refmod |= VM_MEM_REFERENCED;
+ if (page->cs_validated && !page->cs_tainted) {
+ /*
+ * CODE SIGNING:
+ * This page is no longer dirty
+ * but could have been modified,
+ * so it will need to be
+ * re-validated.
+ */
+ page->cs_validated = FALSE;
+ vm_cs_validated_resets++;
}
- pmap_clear_refmod(page->phys_page, clear_refmod);
+ pmap_clear_refmod(page->phys_page, VM_MEM_MODIFIED | VM_MEM_REFERENCED);
page->encrypted = FALSE;
* 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_data_phys(page->phys_page);
+ 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 "no_isync" being set, so that the
- * caches get syncrhonized when the page is first mapped. So we need
- * to set "no_isync" here too, despite the fact that we just
- * synchronized the caches above...
+ * that page. That code relies on "pmapped" being FALSE, so that the
+ * caches get synchronized when the page is first mapped.
*/
- page->no_isync = TRUE;
+ assert(pmap_verify_free(page->phys_page));
+ page->pmapped = FALSE;
+ page->wpmapped = FALSE;
+
+ vm_object_paging_end(page->object);
}
unsigned long upl_encrypt_upls = 0;
upl_encrypt_upls++;
upl_encrypt_pages += crypt_size / PAGE_SIZE;
- upl_lock(upl);
-
upl_object = upl->map_object;
upl_offset = upl->offset;
upl_size = upl->size;
- upl_unlock(upl);
-
vm_object_lock(upl_object);
/*
paging_offset = shadow_object->paging_offset;
vm_object_paging_begin(shadow_object);
- if (shadow_object != upl_object) {
- vm_object_unlock(shadow_object);
- }
- vm_object_unlock(upl_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;
- /*
- * Unmap the pages, so that nobody can continue accessing them while
- * they're encrypted. After that point, all accesses to these pages
- * will cause a page fault and block while the page is being encrypted
- * (busy). After the encryption completes, any access will cause a
- * page fault and the page gets decrypted at that time.
- */
- assert(crypt_offset + crypt_size <= upl_size);
- vm_object_pmap_protect(shadow_object,
- base_offset,
- (vm_object_size_t)crypt_size,
- PMAP_NULL,
- 0,
- VM_PROT_NONE);
- /* XXX FBDP could the object have changed significantly here ? */
- vm_object_lock(shadow_object);
+ assert(crypt_offset + crypt_size <= upl_size);
for (upl_offset = 0;
upl_offset < crypt_size;
base_offset,
upl_offset);
}
+ /*
+ * 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 (shadow_object == vm_pageout_scan_wants_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);
+ vm_object_lock(shadow_object);
+ }
}
vm_object_paging_end(shadow_object);
vm_object_unlock(shadow_object);
}
-vm_size_t
-upl_get_internal_pagelist_offset(void)
+#else /* CRYPTO */
+void
+upl_encrypt(
+ __unused upl_t upl,
+ __unused upl_offset_t crypt_offset,
+ __unused upl_size_t crypt_size)
{
- return sizeof(struct upl);
}
void
-upl_set_dirty(
- upl_t upl)
+vm_page_encrypt(
+ __unused vm_page_t page,
+ __unused vm_map_offset_t kernel_mapping_offset)
+{
+}
+
+void
+vm_page_decrypt(
+ __unused vm_page_t page,
+ __unused vm_map_offset_t kernel_mapping_offset)
+{
+}
+
+#endif /* CRYPTO */
+
+vm_size_t
+upl_get_internal_pagelist_offset(void)
{
- upl->flags |= UPL_CLEAR_DIRTY;
+ return sizeof(struct upl);
}
void
upl_clear_dirty(
- upl_t upl)
+ upl_t upl,
+ boolean_t value)
{
- upl->flags &= ~UPL_CLEAR_DIRTY;
+ if (value) {
+ upl->flags |= UPL_CLEAR_DIRTY;
+ } else {
+ upl->flags &= ~UPL_CLEAR_DIRTY;
+ }
}
#ifdef MACH_BSD
+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_PAGE_PRESENT(upl, index));
}
+boolean_t upl_speculative_page(upl_page_info_t *upl, int index)
+{
+ return(UPL_SPECULATIVE_PAGE(upl, index));
+}
boolean_t upl_dirty_page(upl_page_info_t *upl, int index)
{
return(UPL_DIRTY_PAGE(upl, index));
return(UPL_PHYS_PAGE(upl, index));
}
+
void
vm_countdirtypages(void)
{
} while (!queue_end(&vm_page_queue_inactive,(queue_entry_t) m));
vm_page_unlock_queues();
+ vm_page_lock_queues();
+ m = (vm_page_t) queue_first(&vm_page_queue_throttled);
+ do {
+ 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));
+ vm_page_unlock_queues();
+
vm_page_lock_queues();
m = (vm_page_t) queue_first(&vm_page_queue_zf);
do {
}
#endif /* MACH_BSD */
+ppnum_t upl_get_highest_page(
+ upl_t upl)
+{
+ return upl->highest_page;
+}
+
#ifdef UPL_DEBUG
kern_return_t upl_ubc_alias_set(upl_t upl, unsigned int alias1, unsigned int alias2)
{
projects / apple / xnu.git / blobdiff