kern_memorystatus_freeze.h   [plain text]

/*
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 * Please obtain a copy of the License at
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#ifndef SYS_MEMORYSTATUS_FREEZE_H
#define SYS_MEMORYSTATUS_FREEZE_H

#include <stdint.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/param.h>
#include <sys/kern_memorystatus.h>

typedef struct memorystatus_freeze_entry {
	int32_t pid;
	uint32_t flags;
	uint32_t pages;
} memorystatus_freeze_entry_t;

#ifdef XNU_KERNEL_PRIVATE

extern unsigned long freeze_threshold_percentage;
extern unsigned int memorystatus_frozen_count;
extern unsigned int memorystatus_frozen_processes_max;
extern unsigned int memorystatus_frozen_shared_mb;
extern unsigned int memorystatus_frozen_shared_mb_max;
extern unsigned int memorystatus_freeze_shared_mb_per_process_max; /* Max. MB allowed per process to be freezer-eligible. */
extern unsigned int memorystatus_freeze_private_shared_pages_ratio; /* Ratio of private:shared pages for a process to be freezer-eligible. */
extern unsigned int memorystatus_suspended_count;
extern unsigned int memorystatus_thaw_count;
extern unsigned int memorystatus_refreeze_eligible_count; /* # of processes currently thawed i.e. have state on disk & in-memory */

void memorystatus_freeze_init(void);
extern int  memorystatus_freeze_process_sync(proc_t p);

#ifdef CONFIG_FREEZE

#define FREEZE_PAGES_MIN   ( 8 * 1024 * 1024 / PAGE_SIZE)
#define FREEZE_PAGES_MAX   (max_task_footprint_mb == 0 ? INT_MAX : (max_task_footprint_mb << (20 - PAGE_SHIFT)))

#define FREEZE_SUSPENDED_THRESHOLD_DEFAULT 4
#define FREEZE_PROCESSES_MAX               20

#define FREEZE_DAILY_MB_MAX_DEFAULT       1024
#define FREEZE_DEGRADATION_BUDGET_THRESHOLD     25 //degraded perf. when the daily budget left falls below this threshold percentage

#define MAX_FROZEN_SHARED_MB_PERCENT 10
#define MAX_FROZEN_PROCESS_DEMOTIONS 2
#define MIN_THAW_DEMOTION_THRESHOLD  5
#define MIN_THAW_REFREEZE_THRESHOLD  3  /* min # of global thaws needed for us to consider refreezing these processes. */

typedef struct throttle_interval_t {
	uint32_t mins;
	uint32_t burst_multiple;
	uint32_t pageouts;
	uint32_t max_pageouts;
	mach_timespec_t ts;
} throttle_interval_t;

extern boolean_t memorystatus_freeze_enabled;
extern int memorystatus_freeze_wakeup;

/* Thresholds */
extern unsigned int memorystatus_freeze_threshold;
extern unsigned int memorystatus_freeze_pages_min;
extern unsigned int memorystatus_freeze_pages_max;
extern unsigned int memorystatus_freeze_suspended_threshold;
extern unsigned int memorystatus_freeze_daily_mb_max;
extern uint64_t     memorystatus_freeze_budget_pages_remaining; //remaining # of pages that can be frozen to disk
extern boolean_t memorystatus_freeze_degradation; //protected by the freezer mutex. Signals we are in a degraded freeze mode.

extern unsigned int memorystatus_max_frozen_demotions_daily;
extern unsigned int memorystatus_thaw_count_demotion_threshold;

#if DEVELOPMENT || DEBUG
#define FREEZER_CONTROL_GET_STATUS      (1)
#endif /* DEVELOPMENT || DEBUG */

extern boolean_t memorystatus_freeze_enabled;
extern int memorystatus_freeze_wakeup;
extern int memorystatus_freeze_jetsam_band; /* the jetsam band which will contain P_MEMSTAT_FROZEN processes */

boolean_t memorystatus_freeze_thread_should_run(void);
int memorystatus_set_process_is_freezable(pid_t pid, boolean_t is_freezable);
int memorystatus_get_process_is_freezable(pid_t pid, int *is_freezable);
int memorystatus_freezer_control(int32_t flags, user_addr_t buffer, size_t buffer_size, int32_t *retval);

#endif /* CONFIG_FREEZE */

#endif /* XNU_KERNEL_PRIVATE */

#endif /* SYS_MEMORYSTATUS_FREEZE_H */