xnu-4570.61.1.tar.gz

[apple/xnu.git] / osfmk / vm / vm_pageout.h

diff --git a/osfmk/vm/vm_pageout.h b/osfmk/vm/vm_pageout.h
index dddf37fc2dae192dcfcb7e943f1e801abdad66bc..a397634779ae0a34ac21f1cd4b8c5bfc7d4a29c6 100644 (file)
--- a/osfmk/vm/vm_pageout.h
+++ b/osfmk/vm/vm_pageout.h
@@ -1,5 +1,5 @@
 /*
 /*

- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2009 Apple Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 


@@ -74,7 +74,117 @@
 #include <mach/memory_object_types.h>
 
 #include <kern/kern_types.h>
 #include <mach/memory_object_types.h>
 
 #include <kern/kern_types.h>

-#include <kern/lock.h>
+#include <kern/locks.h>
+
+#include <libkern/OSAtomic.h>
+
+
+#include <vm/vm_options.h>
+
+#ifdef MACH_KERNEL_PRIVATE
+#include <vm/vm_page.h>
+#endif
+
+#include <sys/kdebug.h>
+
+#define VM_PAGE_AVAILABLE_COUNT()              ((unsigned int)(vm_page_cleaned_count))
+
+/* externally manipulated counters */
+extern unsigned int vm_pageout_cleaned_reactivated, vm_pageout_cleaned_fault_reactivated, vm_pageout_cleaned_commit_reactivated;
+
+#if CONFIG_FREEZE
+extern boolean_t memorystatus_freeze_enabled;
+#endif
+
+#define VM_DYNAMIC_PAGING_ENABLED() (VM_CONFIG_COMPRESSOR_IS_ACTIVE)
+
+#if VM_PRESSURE_EVENTS
+extern boolean_t vm_pressure_events_enabled;
+#endif /* VM_PRESSURE_EVENTS */
+
+
+/*
+ * the following codes are used in the DBG_MACH_WORKINGSET subclass
+ * of the DBG_MACH class
+ */
+#define        VM_DISCONNECT_ALL_PAGE_MAPPINGS         0x00
+#define VM_DISCONNECT_TASK_PAGE_MAPPINGS       0x01
+#define VM_REAL_FAULT_ADDR_INTERNAL            0x02
+#define VM_REAL_FAULT_ADDR_PURGABLE            0x03
+#define VM_REAL_FAULT_ADDR_EXTERNAL            0x04
+#define VM_REAL_FAULT_ADDR_SHAREDCACHE         0x05
+
+
+
+extern int     vm_debug_events;
+
+#define VMF_CHECK_ZFDELAY              0x100
+#define VMF_COWDELAY                   0x101
+#define VMF_ZFDELAY                    0x102
+#define VMF_COMPRESSORDELAY            0x103
+
+#define VM_PAGEOUT_SCAN                        0x104
+#define VM_PAGEOUT_BALANCE             0x105
+#define VM_PAGEOUT_FREELIST            0x106
+#define VM_PAGEOUT_PURGEONE            0x107
+#define VM_PAGEOUT_CACHE_EVICT         0x108
+#define VM_PAGEOUT_THREAD_BLOCK                0x109
+#define VM_PAGEOUT_JETSAM              0x10A
+#define VM_INFO1                        0x10B
+#define VM_INFO2                        0x10C
+#define VM_INFO3                        0x10D
+#define VM_INFO4                        0x10E
+#define VM_INFO5                        0x10F
+#define VM_INFO6                        0x110
+#define VM_INFO7                        0x111
+
+#define VM_UPL_PAGE_WAIT               0x120
+#define VM_IOPL_PAGE_WAIT              0x121
+#define VM_PAGE_WAIT_BLOCK             0x122
+
+#if CONFIG_IOSCHED
+#define VM_PAGE_SLEEP                  0x123
+#define VM_PAGE_EXPEDITE               0x124
+#define VM_PAGE_EXPEDITE_NO_MEMORY      0x125
+#endif
+
+#define VM_PRESSURE_EVENT              0x130
+#define VM_EXECVE                      0x131
+#define VM_WAKEUP_COMPACTOR_SWAPPER    0x132
+
+#define VM_DATA_WRITE                  0x140
+
+#define VM_DEBUG_EVENT(name, event, control, arg1, arg2, arg3, arg4)   \
+       MACRO_BEGIN                                             \
+       if (vm_debug_events) {                                  \
+               KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, event)) | control, arg1, arg2, arg3, arg4, 0); \
+       }                                                       \
+       MACRO_END
+
+#define VM_DEBUG_CONSTANT_EVENT(name, event, control, arg1, arg2, arg3, arg4)  \
+       MACRO_BEGIN                                             \
+               KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, event)) | control, arg1, arg2, arg3, arg4, 0); \
+       MACRO_END
+
+extern void memoryshot(unsigned int event, unsigned int control);
+
+extern void update_vm_info(void);
+
+#if CONFIG_IOSCHED
+extern int upl_get_cached_tier(
+       upl_t                   upl);
+#endif
+
+extern ppnum_t upl_get_highest_page(
+       upl_t                   upl);
+
+extern upl_size_t upl_get_size(
+       upl_t                   upl);
+
+extern upl_t upl_associated_upl(upl_t upl);
+extern void upl_set_associated_upl(upl_t upl, upl_t associated_upl);
+
+#ifdef XNU_KERNEL_PRIVATE

 
 extern kern_return_t vm_map_create_upl(
        vm_map_t                map,
 
 extern kern_return_t vm_map_create_upl(
        vm_map_t                map,


@@ -83,73 +193,168 @@ extern kern_return_t vm_map_create_upl(
        upl_t                   *upl,
        upl_page_info_array_t   page_list,
        unsigned int            *count,
        upl_t                   *upl,
        upl_page_info_array_t   page_list,
        unsigned int            *count,

-       int                     *flags);
+       upl_control_flags_t     *flags,
+       vm_tag_t            tag);
+
+extern void iopl_valid_data(
+       upl_t                   upl_ptr,
+       vm_tag_t        tag);
+
+#endif /* XNU_KERNEL_PRIVATE */
+
+extern struct vnode * upl_lookup_vnode(upl_t upl);
+
+#ifndef        MACH_KERNEL_PRIVATE
+typedef struct vm_page *vm_page_t;
+#endif
+
+extern void                vm_page_free_list(
+                            vm_page_t  mem,
+                            boolean_t  prepare_object);
+
+extern kern_return_t      vm_page_alloc_list(
+                            int         page_count,
+                            int                        flags,
+                            vm_page_t * list);
+
+extern void               vm_page_set_offset(vm_page_t page, vm_object_offset_t offset);
+extern vm_object_offset_t vm_page_get_offset(vm_page_t page);
+extern ppnum_t            vm_page_get_phys_page(vm_page_t page);
+extern vm_page_t          vm_page_get_next(vm_page_t page);
+
+extern kern_return_t   mach_vm_pressure_level_monitor(boolean_t wait_for_pressure, unsigned int *pressure_level);
+
+#if !CONFIG_EMBEDDED
+extern kern_return_t   vm_pageout_wait(uint64_t deadline);
+#endif

 
 #ifdef MACH_KERNEL_PRIVATE
 
 #include <vm/vm_page.h>
 
 extern unsigned int    vm_pageout_scan_event_counter;
 
 #ifdef MACH_KERNEL_PRIVATE
 
 #include <vm/vm_page.h>
 
 extern unsigned int    vm_pageout_scan_event_counter;

-extern unsigned int    vm_zf_count;
+extern unsigned int    vm_page_anonymous_count;
+
+
+/*
+ * must hold the page queues lock to
+ * manipulate this structure
+ */
+struct vm_pageout_queue {
+        vm_page_queue_head_t   pgo_pending;    /* laundry pages to be processed by pager's iothread */
+        unsigned int   pgo_laundry;    /* current count of laundry pages on queue or in flight */
+        unsigned int   pgo_maxlaundry;
+       uint64_t        pgo_tid;        /* thread ID of I/O thread that services this queue */
+       uint8_t         pgo_lowpriority; /* iothread is set to use low priority I/O */
+
+        unsigned int   pgo_idle:1,     /* iothread is blocked waiting for work to do */
+                       pgo_busy:1,     /* iothread is currently processing request from pgo_pending */
+                       pgo_throttled:1,/* vm_pageout_scan thread needs a wakeup when pgo_laundry drops */
+                       pgo_draining:1,
+                       pgo_inited:1,
+                       :0;
+};
+
+#define VM_PAGE_Q_THROTTLED(q)         \
+        ((q)->pgo_laundry >= (q)->pgo_maxlaundry)
+
+extern struct  vm_pageout_queue        vm_pageout_queue_internal;
+extern struct  vm_pageout_queue        vm_pageout_queue_external;
+

 
 /*
  *     Routines exported to Mach.
  */
 extern void            vm_pageout(void);
 
 
 /*
  *     Routines exported to Mach.
  */
 extern void            vm_pageout(void);
 

-extern vm_object_t     vm_pageout_object_allocate(
-                                       vm_page_t               m,
-                                       vm_size_t               size,
-                                       vm_object_offset_t      offset);
+extern kern_return_t   vm_pageout_internal_start(void);

 
 extern void            vm_pageout_object_terminate(
                                        vm_object_t     object);
 
 
 extern void            vm_pageout_object_terminate(
                                        vm_object_t     object);
 

-extern vm_page_t       vm_pageout_setup(
-                                       vm_page_t               m,
-                                       vm_object_t             new_object,
-                                       vm_object_offset_t      new_offset);
-

 extern void            vm_pageout_cluster(
                                        vm_page_t       m);
 
 extern void            vm_pageout_initialize_page(
                                        vm_page_t       m);
 
 extern void            vm_pageout_cluster(
                                        vm_page_t       m);
 
 extern void            vm_pageout_initialize_page(
                                        vm_page_t       m);
 

-extern void            vm_pageclean_setup(
-                                       vm_page_t               m,
-                                       vm_page_t               new_m,
-                                       vm_object_t             new_object,
-                                       vm_object_offset_t      new_offset);
+/* UPL exported routines and structures */

 
 

-extern void            vm_pageclean_copy(
-                                       vm_page_t               m,
-                                       vm_page_t               new_m,
-                                       vm_object_t             new_object,
-                                       vm_object_offset_t      new_offset);
+#define upl_lock_init(object)  lck_mtx_init(&(object)->Lock, &vm_object_lck_grp, &vm_object_lck_attr)
+#define upl_lock_destroy(object)       lck_mtx_destroy(&(object)->Lock, &vm_object_lck_grp)
+#define upl_lock(object)       lck_mtx_lock(&(object)->Lock)
+#define upl_unlock(object)     lck_mtx_unlock(&(object)->Lock)
+#define upl_try_lock(object)   lck_mtx_try_lock(&(object)->Lock)

 
 

-/* UPL exported routines and structures */
+#define MAX_VECTOR_UPL_ELEMENTS        8
+
+struct _vector_upl_iostates{
+       upl_offset_t offset;
+       upl_size_t   size;
+};

 
 

-#define upl_lock_init(object)  mutex_init(&(object)->Lock, 0)
-#define upl_lock(object)       mutex_lock(&(object)->Lock)
-#define upl_unlock(object)     mutex_unlock(&(object)->Lock)
+typedef struct _vector_upl_iostates vector_upl_iostates_t;
+
+struct _vector_upl {
+       upl_size_t              size;
+       uint32_t                num_upls;
+       uint32_t                invalid_upls;
+       uint32_t                _reserved;
+       vm_map_t                submap;
+       vm_offset_t             submap_dst_addr;
+       vm_object_offset_t      offset;
+       upl_t                   upl_elems[MAX_VECTOR_UPL_ELEMENTS];     
+       upl_page_info_array_t   pagelist;       
+       vector_upl_iostates_t   upl_iostates[MAX_VECTOR_UPL_ELEMENTS]; 
+};

 
 

+typedef struct _vector_upl* vector_upl_t;

 
 /* universal page list structure */
 
 
 /* universal page list structure */
 

+#if UPL_DEBUG
+#define        UPL_DEBUG_STACK_FRAMES  16
+#define UPL_DEBUG_COMMIT_RECORDS 4
+
+struct ucd {
+       upl_offset_t    c_beg;
+       upl_offset_t    c_end;
+       int             c_aborted;
+       void *          c_retaddr[UPL_DEBUG_STACK_FRAMES];
+};
+#endif
+
+

 struct upl {
 struct upl {

-       decl_mutex_data(,       Lock)   /* Synchronization */
+       decl_lck_mtx_data(,     Lock)   /* Synchronization */

        int             ref_count;
        int             ref_count;

+       int             ext_ref_count;

        int             flags;
        int             flags;

-       vm_object_t     src_object; /* object derived from */

        vm_object_offset_t offset;
        upl_size_t      size;       /* size in bytes of the address space */
        vm_offset_t     kaddr;      /* secondary mapping in kernel */
        vm_object_t     map_object;
        vm_object_offset_t offset;
        upl_size_t      size;       /* size in bytes of the address space */
        vm_offset_t     kaddr;      /* secondary mapping in kernel */
        vm_object_t     map_object;

-#ifdef UPL_DEBUG
-       unsigned int    ubc_alias1;
-       unsigned int    ubc_alias2;
+       ppnum_t         highest_page;
+       void*           vector_upl;
+       upl_t           associated_upl;
+#if CONFIG_IOSCHED
+       int             upl_priority;
+       uint64_t        *upl_reprio_info;
+       void            *decmp_io_upl;
+#endif
+#if CONFIG_IOSCHED || UPL_DEBUG
+       thread_t        upl_creator;

        queue_chain_t   uplq;       /* List of outstanding upls on an obj */
        queue_chain_t   uplq;       /* List of outstanding upls on an obj */

+#endif
+#if    UPL_DEBUG
+       uintptr_t       ubc_alias1;
+       uintptr_t       ubc_alias2;
+               
+       uint32_t        upl_state;
+       uint32_t        upl_commit_index;
+       void    *upl_create_retaddr[UPL_DEBUG_STACK_FRAMES];
+
+       struct  ucd     upl_commit_records[UPL_DEBUG_COMMIT_RECORDS];

 #endif /* UPL_DEBUG */
 };
 
 #endif /* UPL_DEBUG */
 };
 


@@ -165,13 +370,41 @@ struct upl {
 #define UPL_LITE               0x100
 #define UPL_IO_WIRE            0x200
 #define UPL_ACCESS_BLOCKED     0x400
 #define UPL_LITE               0x100
 #define UPL_IO_WIRE            0x200
 #define UPL_ACCESS_BLOCKED     0x400

-#define UPL_ENCRYPTED          0x800
-
+#define UPL_SHADOWED           0x1000
+#define UPL_KERNEL_OBJECT      0x2000
+#define UPL_VECTOR             0x4000
+#define UPL_SET_DIRTY          0x8000
+#define UPL_HAS_BUSY           0x10000
+#define UPL_TRACKED_BY_OBJECT  0x20000
+#define UPL_EXPEDITE_SUPPORTED         0x40000
+#define UPL_DECMP_REQ          0x80000
+#define UPL_DECMP_REAL_IO      0x100000

 
 /* flags for upl_create flags parameter */
 #define UPL_CREATE_EXTERNAL    0
 #define UPL_CREATE_INTERNAL    0x1
 #define UPL_CREATE_LITE                0x2
 
 /* flags for upl_create flags parameter */
 #define UPL_CREATE_EXTERNAL    0
 #define UPL_CREATE_INTERNAL    0x1
 #define UPL_CREATE_LITE                0x2

+#define UPL_CREATE_IO_TRACKING 0x4
+#define UPL_CREATE_EXPEDITE_SUP 0x8
+
+extern upl_t vector_upl_create(vm_offset_t);
+extern void vector_upl_deallocate(upl_t);
+extern boolean_t vector_upl_is_valid(upl_t);
+extern boolean_t vector_upl_set_subupl(upl_t, upl_t, u_int32_t);
+extern void vector_upl_set_pagelist(upl_t);
+extern void vector_upl_set_submap(upl_t, vm_map_t, vm_offset_t);
+extern void vector_upl_get_submap(upl_t, vm_map_t*, vm_offset_t*);
+extern void vector_upl_set_iostate(upl_t, upl_t, upl_offset_t, upl_size_t);
+extern void vector_upl_get_iostate(upl_t, upl_t, upl_offset_t*, upl_size_t*);
+extern void vector_upl_get_iostate_byindex(upl_t, uint32_t, upl_offset_t*, upl_size_t*);
+extern upl_t vector_upl_subupl_byindex(upl_t , uint32_t);
+extern upl_t vector_upl_subupl_byoffset(upl_t , upl_offset_t*, upl_size_t*);
+
+extern void vm_object_set_pmap_cache_attr(
+               vm_object_t             object,
+               upl_page_info_array_t   user_page_list,
+               unsigned int            num_pages,
+               boolean_t               batch_pmap_op);

 
 extern kern_return_t vm_object_iopl_request(
        vm_object_t             object,
 
 extern kern_return_t vm_object_iopl_request(
        vm_object_t             object,


@@ -180,7 +413,8 @@ extern kern_return_t vm_object_iopl_request(
        upl_t                   *upl_ptr,
        upl_page_info_array_t   user_page_list,
        unsigned int            *page_list_count,
        upl_t                   *upl_ptr,
        upl_page_info_array_t   user_page_list,
        unsigned int            *page_list_count,

-       int                     cntrl_flags);
+       upl_control_flags_t     cntrl_flags,
+       vm_tag_t            tag);

 
 extern kern_return_t vm_object_super_upl_request(
        vm_object_t             object,
 
 extern kern_return_t vm_object_super_upl_request(
        vm_object_t             object,


@@ -190,7 +424,8 @@ extern kern_return_t vm_object_super_upl_request(
        upl_t                   *upl,
        upl_page_info_t         *user_page_list,
        unsigned int            *page_list_count,
        upl_t                   *upl,
        upl_page_info_t         *user_page_list,
        unsigned int            *page_list_count,

-       int                     cntrl_flags);
+       upl_control_flags_t     cntrl_flags,
+       vm_tag_t            tag);

 
 /* should be just a regular vm_map_enter() */
 extern kern_return_t vm_map_enter_upl(
 
 /* should be just a regular vm_map_enter() */
 extern kern_return_t vm_map_enter_upl(


@@ -203,48 +438,23 @@ extern kern_return_t vm_map_remove_upl(
        vm_map_t                map, 
        upl_t                   upl);
 
        vm_map_t                map, 
        upl_t                   upl);
 

-#ifdef UPL_DEBUG
-extern kern_return_t  upl_ubc_alias_set(
-       upl_t upl,
-       unsigned int alias1,
-       unsigned int alias2);
-extern int  upl_ubc_alias_get(
-       upl_t upl,
-       unsigned int * al,
-       unsigned int * al2);
-#endif /* UPL_DEBUG */
-

 /* wired  page list structure */
 /* wired  page list structure */

-typedef unsigned long *wpl_array_t;
+typedef uint32_t *wpl_array_t;

 
 

-extern void vm_page_free_list(
-       register vm_page_t      mem);
-        

 extern void vm_page_free_reserve(int pages);
 
 extern void vm_pageout_throttle_down(vm_page_t page);
 extern void vm_pageout_throttle_up(vm_page_t page);
 
 extern void vm_page_free_reserve(int pages);
 
 extern void vm_pageout_throttle_down(vm_page_t page);
 extern void vm_pageout_throttle_up(vm_page_t page);
 

-/*
- * ENCRYPTED SWAP:
- */
-extern void upl_encrypt(
-       upl_t                   upl,
-       upl_offset_t            crypt_offset,
-       upl_size_t              crypt_size);
-extern void vm_page_encrypt(
-       vm_page_t               page,
-       vm_map_offset_t         kernel_map_offset);
-extern boolean_t vm_pages_encrypted; /* are there encrypted pages ? */
-extern void vm_page_decrypt(
-       vm_page_t               page,
-       vm_map_offset_t         kernel_map_offset);

 extern kern_return_t vm_paging_map_object(
 extern kern_return_t vm_paging_map_object(

-       vm_map_offset_t         *address,

        vm_page_t               page,
        vm_object_t             object,
        vm_object_offset_t      offset,
        vm_page_t               page,
        vm_object_t             object,
        vm_object_offset_t      offset,

-       vm_map_size_t           *size);
+       vm_prot_t               protection,
+       boolean_t               can_unlock_object,
+       vm_map_size_t           *size,          /* IN/OUT */
+       vm_map_offset_t         *address,       /* OUT */
+       boolean_t               *need_unmap);   /* OUT */

 extern void vm_paging_unmap_object(
        vm_object_t             object,
        vm_map_offset_t         start,
 extern void vm_paging_unmap_object(
        vm_object_t             object,
        vm_map_offset_t         start,


@@ -256,8 +466,26 @@ decl_simple_lock_data(extern, vm_paging_lock)
  */
 extern unsigned int    vm_backing_store_low;
 
  */
 extern unsigned int    vm_backing_store_low;
 

+extern void vm_pageout_steal_laundry(
+       vm_page_t page, 
+       boolean_t queues_locked);
+       
+extern boolean_t vm_page_is_slideable(vm_page_t m);
+
+extern kern_return_t vm_page_slide(vm_page_t page, vm_map_offset_t kernel_mapping_offset);

 #endif  /* MACH_KERNEL_PRIVATE */
 
 #endif  /* MACH_KERNEL_PRIVATE */
 

+#if UPL_DEBUG
+extern kern_return_t  upl_ubc_alias_set(
+       upl_t upl,
+       uintptr_t alias1,
+       uintptr_t alias2);
+extern int  upl_ubc_alias_get(
+       upl_t upl,
+       uintptr_t * al,
+       uintptr_t * al2);
+#endif /* UPL_DEBUG */
+

 extern void vm_countdirtypages(void);
 
 extern void vm_backing_store_disable(
 extern void vm_countdirtypages(void);
 
 extern void vm_backing_store_disable(


@@ -267,6 +495,96 @@ extern kern_return_t upl_transpose(
        upl_t   upl1,
        upl_t   upl2);
 
        upl_t   upl1,
        upl_t   upl2);
 

+extern kern_return_t mach_vm_pressure_monitor(
+       boolean_t       wait_for_pressure,
+       unsigned int    nsecs_monitored,
+       unsigned int    *pages_reclaimed_p,
+       unsigned int    *pages_wanted_p);
+
+extern kern_return_t
+vm_set_buffer_cleanup_callout(
+       boolean_t       (*func)(int));
+
+struct vm_page_stats_reusable {
+       SInt32          reusable_count;
+       uint64_t        reusable;
+       uint64_t        reused;
+       uint64_t        reused_wire;
+       uint64_t        reused_remove;
+       uint64_t        all_reusable_calls;
+       uint64_t        partial_reusable_calls;
+       uint64_t        all_reuse_calls;
+       uint64_t        partial_reuse_calls;
+       uint64_t        reusable_pages_success;
+       uint64_t        reusable_pages_failure;
+       uint64_t        reusable_pages_shared;
+       uint64_t        reuse_pages_success;
+       uint64_t        reuse_pages_failure;
+       uint64_t        can_reuse_success;
+       uint64_t        can_reuse_failure;
+       uint64_t        reusable_reclaimed;
+       uint64_t        reusable_nonwritable;
+       uint64_t        reusable_shared;
+       uint64_t        free_shared;
+};
+extern struct vm_page_stats_reusable vm_page_stats_reusable;
+       
+extern int hibernate_flush_memory(void);
+extern void hibernate_reset_stats(void);
+extern void hibernate_create_paddr_map(void);
+
+extern void vm_set_restrictions(void);
+
+extern int vm_compressor_mode;
+extern int vm_compressor_thread_count;
+extern boolean_t vm_restricted_to_single_processor;
+extern kern_return_t vm_pageout_compress_page(void **, char *, vm_page_t, boolean_t);
+extern void vm_pageout_anonymous_pages(void);
+extern void vm_pageout_disconnect_all_pages(void);
+
+
+struct vm_config {
+       boolean_t       compressor_is_present;          /* compressor is initialized and can be used by the freezer, the sweep or the pager */
+       boolean_t       compressor_is_active;           /* pager can actively compress pages...  'compressor_is_present' must be set */
+       boolean_t       swap_is_present;                /* swap is initialized and can be used by the freezer, the sweep or the pager */
+       boolean_t       swap_is_active;                 /* pager can actively swap out compressed segments... 'swap_is_present' must be set */
+       boolean_t       freezer_swap_is_active;         /* freezer can swap out frozen tasks... "compressor_is_present + swap_is_present" must be set */
+};
+
+extern struct vm_config        vm_config;
+
+
+#define        VM_PAGER_NOT_CONFIGURED                         0x0     /* no compresser or swap configured */
+#define VM_PAGER_DEFAULT                               0x1     /* Use default pager... DEPRECATED */
+#define VM_PAGER_COMPRESSOR_NO_SWAP                    0x2     /* Active in-core compressor only. */
+#define VM_PAGER_COMPRESSOR_WITH_SWAP                  0x4     /* Active in-core compressor + swap backend. */
+#define VM_PAGER_FREEZER_DEFAULT                       0x8     /* Freezer backed by default pager... DEPRECATED */
+#define VM_PAGER_FREEZER_COMPRESSOR_NO_SWAP            0x10    /* Freezer backed by in-core compressor only i.e. frozen data remain in-core compressed.*/
+#define VM_PAGER_COMPRESSOR_NO_SWAP_PLUS_FREEZER_COMPRESSOR_WITH_SWAP  0x20    /* Active in-core compressor + Freezer backed by in-core compressor with swap support too.*/
+
+#define VM_PAGER_MAX_MODES                             6       /* Total number of vm compressor modes supported */
+
+
+#define        VM_CONFIG_COMPRESSOR_IS_PRESENT         (vm_config.compressor_is_present == TRUE)
+#define        VM_CONFIG_COMPRESSOR_IS_ACTIVE          (vm_config.compressor_is_active == TRUE)
+#define        VM_CONFIG_SWAP_IS_PRESENT               (vm_config.swap_is_present == TRUE)
+#define        VM_CONFIG_SWAP_IS_ACTIVE                (vm_config.swap_is_active == TRUE)
+#define        VM_CONFIG_FREEZER_SWAP_IS_ACTIVE        (vm_config.freezer_swap_is_active == TRUE)
+

 #endif /* KERNEL_PRIVATE */
 
 #endif /* KERNEL_PRIVATE */
 

+#ifdef XNU_KERNEL_PRIVATE
+#define MAX_COMPRESSOR_THREAD_COUNT      8
+
+#if DEVELOPMENT || DEBUG
+typedef struct vmct_stats_s {
+       uint64_t vmct_runtimes[MAX_COMPRESSOR_THREAD_COUNT];
+       uint64_t vmct_pages[MAX_COMPRESSOR_THREAD_COUNT];
+       uint64_t vmct_iterations[MAX_COMPRESSOR_THREAD_COUNT];
+       uint64_t vmct_cthreads_total;
+       int32_t vmct_minpages[MAX_COMPRESSOR_THREAD_COUNT];
+       int32_t vmct_maxpages[MAX_COMPRESSOR_THREAD_COUNT];
+} vmct_stats_t;
+#endif
+#endif

 #endif /* _VM_VM_PAGEOUT_H_ */
 #endif /* _VM_VM_PAGEOUT_H_ */