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	1	/*
	2	* Copyright (c) 2006 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	@header kern_memorystatus.h
	30	This header defines a kernel event subclass for the OSMemoryNotification API
	31	*/
	32
	33	#ifndef SYS_KERN_MEMORYSTATUS_H
	34	#define SYS_KERN_MEMORYSTATUS_H
	35
	36	#ifndef MACH_KERNEL_PRIVATE
	37
	38	#include <stdint.h>
	39	#include <sys/time.h>
	40	#include <sys/proc.h>
	41
	42	/*
	43	* Define Memory Status event subclass.
	44	* Subclass of KEV_SYSTEM_CLASS
	45	*/
	46
	47	/*!
	48	@defined KEV_MEMORYSTATUS_SUBCLASS
	49	@discussion The kernel event subclass for memory status events.
	50	*/
	51	#define KEV_MEMORYSTATUS_SUBCLASS 3
	52
	53	enum {
	54	kMemoryStatusLevelNote = 1,
	55	kMemoryStatusSnapshotNote = 2,
	56	kMemoryStatusHibernationNote = 3
	57	};
	58
	59	enum {
	60	kMemoryStatusLevelAny = -1,
	61	kMemoryStatusLevelNormal = 0,
	62	kMemoryStatusLevelWarning = 1,
	63	kMemoryStatusLevelUrgent = 2,
	64	kMemoryStatusLevelCritical = 3
	65	};
	66
	67	typedef struct jetsam_priority_entry {
	68	pid_t pid;
	69	uint32_t flags;
	70	int32_t hiwat_pages;
	71	int32_t hiwat_reserved1;
	72	int32_t hiwat_reserved2;
	73	int32_t hiwat_reserved3;
	74	} jetsam_priority_entry_t;
	75
	76	/*
	77	** maximum killable processes to keep track of
	78	*/
	79	#define kMaxPriorityEntries 64
	80
	81	typedef struct jetsam_snapshot_entry {
	82	pid_t pid;
	83	char name[MAXCOMLEN+1];
	84	uint32_t pages;
	85	uint32_t flags;
	86	uint8_t uuid[16];
	87	} jetsam_snapshot_entry_t;
	88
	89	/*
	90	** how many processes to snapshot
	91	*/
	92	#define kMaxSnapshotEntries 128
	93
	94	typedef struct jetsam_kernel_stats {
	95	uint32_t free_pages;
	96	uint32_t active_pages;
	97	uint32_t inactive_pages;
	98	uint32_t purgeable_pages;
	99	uint32_t wired_pages;
	100	} jetsam_kernel_stats_t;
	101
	102	/*
	103	** This is a variable-length struct.
	104	** Allocate a buffer of the size returned by the sysctl, cast to a jetsam_snapshot_t *
	105	*/
	106
	107	typedef struct jetsam_snapshot {
	108	jetsam_kernel_stats_t stats;
	109	size_t entry_count;
	110	jetsam_snapshot_entry_t entries[1];
	111	} jetsam_snapshot_t;
	112
	113	typedef struct jetsam_hibernation_entry {
	114	uint32_t pid;
	115	uint32_t flags;
	116	uint32_t pages;
	117	} jetsam_hibernation_entry_t;
	118
	119	#endif /* !MACH_KERNEL_PRIVATE */
	120
	121	enum {
	122	kJetsamFlagsFrontmost = (1 << 0),
	123	kJetsamFlagsKilled = (1 << 1),
	124	kJetsamFlagsKilledHiwat = (1 << 2),
	125	kJetsamFlagsHibernated = (1 << 3),
	126	kJetsamFlagsKilledVnodes = (1 << 4),
	127	kJetsamFlagsKilledSwap = (1 << 5),
	128	kJetsamFlagsThawed = (1 << 6),
	129	kJetsamFlagsKilledVM = (1 << 7),
	130	kJetsamFlagsSuspForDiagnosis = (1 << 8)
	131	};
	132
	133	#ifdef KERNEL
	134	extern void kern_memorystatus_init(void) __attribute__((section("__TEXT, initcode")));
	135	extern int jetsam_kill_top_proc(boolean_t any, uint32_t reason);
	136
	137	extern int kern_memorystatus_wakeup;
	138	extern int kern_memorystatus_level;
	139	extern unsigned int kern_memorystatus_delta;
	140
	141	#ifdef CONFIG_FREEZE
	142	extern void kern_hibernation_init(void) __attribute__((section("__TEXT, initcode")));
	143	extern int kern_hibernation_wakeup;
	144
	145	void kern_hibernation_on_pid_suspend(int pid);
	146	void kern_hibernation_on_pid_resume(int pid, task_t task);
	147	void kern_hibernation_on_pid_hibernate(int pid);
	148	#endif
	149
	150	#if CONFIG_EMBEDDED
	151	#define VM_CHECK_MEMORYSTATUS do { vm_check_memorystatus(); } while(0)
	152	#else /CONFIG_EMBEDDED/
	153	#define VM_CHECK_MEMORYSTATUS do {} while(0)
	154	#endif
	155
	156	#endif /* KERNEL */
	157	#endif /* SYS_KERN_MEMORYSTATUS_H */