osfmk/vm/vm_compressor_pager.h

   1 /*
   2  * Copyright (c) 2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifdef  XNU_KERNEL_PRIVATE
  30
  31 #ifndef _VM_VM_COMPRESSOR_PAGER_H_
  32 #define _VM_VM_COMPRESSOR_PAGER_H_
  33
  34 #include <mach/mach_types.h>
  35 #include <kern/kern_types.h>
  36 #include <vm/vm_external.h>
  37
  38 extern kern_return_t vm_compressor_pager_put(
  39         memory_object_t                 mem_obj,
  40         memory_object_offset_t          offset,
  41         ppnum_t                         ppnum,
  42         void                            **current_chead,
  43         char                            *scratch_buf,
  44         int                             *compressed_count_delta_p);
  45 extern kern_return_t vm_compressor_pager_get(
  46         memory_object_t         mem_obj,
  47         memory_object_offset_t  offset,
  48         ppnum_t                 ppnum,
  49         int                     *my_fault_type,
  50         int                     flags,
  51         int                     *compressed_count_delta_p);
  52
  53 #define C_DONT_BLOCK            0x01
  54 #define C_KEEP                  0x02
  55
  56 extern unsigned int vm_compressor_pager_state_clr(
  57         memory_object_t         mem_obj,
  58         memory_object_offset_t  offset);
  59 extern vm_external_state_t vm_compressor_pager_state_get(
  60         memory_object_t         mem_obj,
  61         memory_object_offset_t  offset);
  62
  63 #define VM_COMPRESSOR_PAGER_STATE_GET(object, offset)                   \
  64         (((COMPRESSED_PAGER_IS_ACTIVE ||                                \
  65            DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) &&               \
  66           (object)->internal &&                                         \
  67           (object)->pager != NULL &&                                    \
  68           !(object)->terminating &&                                     \
  69           (object)->alive)                                              \
  70          ? vm_compressor_pager_state_get((object)->pager,               \
  71                                          (offset) + (object)->paging_offset) \
  72          : VM_EXTERNAL_STATE_UNKNOWN)
  73
  74 #define VM_COMPRESSOR_PAGER_STATE_CLR(object, offset)                   \
  75         MACRO_BEGIN                                                     \
  76         if ((COMPRESSED_PAGER_IS_ACTIVE ||                              \
  77              DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) &&             \
  78             (object)->internal &&                                       \
  79             (object)->pager != NULL &&                                  \
  80             !(object)->terminating &&                                   \
  81             (object)->alive) {                                          \
  82                 int _num_pages_cleared;                                 \
  83                 _num_pages_cleared =                                    \
  84                         vm_compressor_pager_state_clr(                  \
  85                                 (object)->pager,                        \
  86                                 (offset) + (object)->paging_offset);    \
  87                 if (_num_pages_cleared) {                               \
  88                         vm_compressor_pager_count((object)->pager,      \
  89                                                   -_num_pages_cleared,  \
  90                                                   FALSE, /* shared */   \
  91                                                   (object));            \
  92                 }                                                       \
  93                 if (_num_pages_cleared &&                               \
  94                     (object)->purgable != VM_PURGABLE_DENY &&           \
  95                     (object)->vo_purgeable_owner != NULL) {             \
  96                         /* less compressed purgeable pages */           \
  97                         assert(_num_pages_cleared == 1);                \
  98                         vm_purgeable_compressed_update(                 \
  99                                 (object),                               \
 100                                 -_num_pages_cleared);                   \
 101                 }                                                       \
 102         }                                                               \
 103         MACRO_END
 104
 105 extern void vm_compressor_pager_transfer(
 106         memory_object_t         dst_mem_obj,
 107         memory_object_offset_t  dst_offset,
 108         memory_object_t         src_mem_obj,
 109         memory_object_offset_t  src_offset);
 110 extern memory_object_offset_t vm_compressor_pager_next_compressed(
 111         memory_object_t         mem_obj,
 112         memory_object_offset_t  offset);
 113
 114 extern void vm_compressor_init(void);
 115 extern int vm_compressor_put(ppnum_t pn, int *slot, void **current_chead, char *scratch_buf);
 116 extern int vm_compressor_get(ppnum_t pn, int *slot, int flags);
 117 extern int vm_compressor_free(int *slot, int flags);
 118 extern unsigned int vm_compressor_pager_reap_pages(memory_object_t mem_obj, int flags);
 119 extern unsigned int vm_compressor_pager_get_slots_occupied(memory_object_t mem_obj);
 120 extern unsigned int vm_compressor_pager_get_count(memory_object_t mem_obj);
 121 extern void vm_compressor_pager_count(memory_object_t mem_obj,
 122                                       int compressed_count_delta,
 123                                       boolean_t shared_lock,
 124                                       vm_object_t object);
 125 extern void vm_compressor_transfer(int *dst_slot_p, int *src_slot_p);
 126
 127 #endif  /* _VM_VM_COMPRESSOR_PAGER_H_ */
 128
 129 #endif  /* XNU_KERNEL_PRIVATE */