bsd/sys/kern_memorystatus_freeze.h

   1 /*
   2  * Copyright (c) 2006-2018 Apple Computer, 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 #ifndef SYS_MEMORYSTATUS_FREEZE_H
  30 #define SYS_MEMORYSTATUS_FREEZE_H
  31
  32 #include <stdint.h>
  33 #include <sys/time.h>
  34 #include <sys/proc.h>
  35 #include <sys/param.h>
  36 #include <sys/kern_memorystatus.h>
  37
  38 typedef struct memorystatus_freeze_entry {
  39         int32_t pid;
  40         uint32_t flags;
  41         uint32_t pages;
  42 } memorystatus_freeze_entry_t;
  43
  44 #ifdef XNU_KERNEL_PRIVATE
  45
  46 extern unsigned long freeze_threshold_percentage;
  47 extern unsigned int memorystatus_frozen_count; /* # of processes that are currently frozen. */
  48 extern unsigned int memorystatus_frozen_processes_max;
  49 extern unsigned int memorystatus_frozen_shared_mb;
  50 extern unsigned int memorystatus_frozen_shared_mb_max;
  51 extern unsigned int memorystatus_freeze_shared_mb_per_process_max; /* Max. MB allowed per process to be freezer-eligible. */
  52 extern unsigned int memorystatus_freeze_private_shared_pages_ratio; /* Ratio of private:shared pages for a process to be freezer-eligible. */
  53 extern unsigned int memorystatus_suspended_count;
  54 extern unsigned int memorystatus_thaw_count; /* # of processes that have been thawed in the current interval. */
  55 extern unsigned int memorystatus_refreeze_eligible_count; /* # of processes currently thawed i.e. have state on disk & in-memory */
  56
  57 void memorystatus_freeze_init(void);
  58 extern int  memorystatus_freeze_process_sync(proc_t p);
  59
  60 #ifdef CONFIG_FREEZE
  61
  62 #define FREEZE_PAGES_MIN   ( 8 * 1024 * 1024 / PAGE_SIZE)
  63 #define FREEZE_PAGES_MAX   (max_task_footprint_mb == 0 ? INT_MAX : (max_task_footprint_mb << (20 - PAGE_SHIFT)))
  64
  65 #define FREEZE_SUSPENDED_THRESHOLD_DEFAULT 4
  66 #define FREEZE_PROCESSES_MAX               20
  67
  68 #define FREEZE_DAILY_MB_MAX_DEFAULT       1024
  69 #define FREEZE_DEGRADATION_BUDGET_THRESHOLD     25 //degraded perf. when the daily budget left falls below this threshold percentage
  70
  71 #define MAX_FROZEN_SHARED_MB_PERCENT 10
  72 #define MAX_FROZEN_PROCESS_DEMOTIONS 2
  73 #define MIN_THAW_DEMOTION_THRESHOLD  5
  74 #define MIN_THAW_REFREEZE_THRESHOLD  3  /* min # of global thaws needed for us to consider refreezing these processes. */
  75
  76 typedef struct throttle_interval_t {
  77         uint32_t mins;
  78         uint32_t burst_multiple;
  79         uint32_t pageouts;
  80         uint32_t max_pageouts;
  81         mach_timespec_t ts;
  82 } throttle_interval_t;
  83
  84 extern boolean_t memorystatus_freeze_enabled;
  85 extern int memorystatus_freeze_wakeup;
  86
  87 /* Thresholds */
  88 extern unsigned int memorystatus_freeze_threshold;
  89 extern unsigned int memorystatus_freeze_pages_min;
  90 extern unsigned int memorystatus_freeze_pages_max;
  91 extern unsigned int memorystatus_freeze_suspended_threshold;
  92 extern unsigned int memorystatus_freeze_daily_mb_max;
  93 extern uint64_t     memorystatus_freeze_budget_pages_remaining; //remaining # of pages that can be frozen to disk
  94 extern boolean_t memorystatus_freeze_degradation; //protected by the freezer mutex. Signals we are in a degraded freeze mode.
  95
  96 extern unsigned int memorystatus_max_frozen_demotions_daily;
  97 extern unsigned int memorystatus_thaw_count_demotion_threshold;
  98
  99 #if DEVELOPMENT || DEBUG
 100 #define FREEZER_CONTROL_GET_STATUS      (1)
 101 #endif /* DEVELOPMENT || DEBUG */
 102
 103 extern boolean_t memorystatus_freeze_enabled;
 104 extern int memorystatus_freeze_wakeup;
 105 extern int memorystatus_freeze_jetsam_band; /* the jetsam band which will contain P_MEMSTAT_FROZEN processes */
 106
 107 boolean_t memorystatus_freeze_thread_should_run(void);
 108 int memorystatus_set_process_is_freezable(pid_t pid, boolean_t is_freezable);
 109 int memorystatus_get_process_is_freezable(pid_t pid, int *is_freezable);
 110 int memorystatus_freezer_control(int32_t flags, user_addr_t buffer, size_t buffer_size, int32_t *retval);
 111
 112 #endif /* CONFIG_FREEZE */
 113
 114 #endif /* XNU_KERNEL_PRIVATE */
 115
 116 #endif /* SYS_MEMORYSTATUS_FREEZE_H */