[linux-2.6-block.git] / include / linux / oom.h

#ifndef __INCLUDE_LINUX_OOM_H
#define __INCLUDE_LINUX_OOM_H

/*
 * /proc/<pid>/oom_adj is deprecated, see
 * Documentation/feature-removal-schedule.txt.
 *
 * /proc/<pid>/oom_adj set to -17 protects from the oom-killer
 */
#define OOM_DISABLE (-17)
/* inclusive */
#define OOM_ADJUST_MIN (-16)
#define OOM_ADJUST_MAX 15

/*
 * /proc/<pid>/oom_score_adj set to OOM_SCORE_ADJ_MIN disables oom killing for
 * pid.
 */
#define OOM_SCORE_ADJ_MIN	(-1000)
#define OOM_SCORE_ADJ_MAX	1000

#ifdef __KERNEL__

#include <linux/sched.h>
#include <linux/types.h>
#include <linux/nodemask.h>

struct zonelist;
struct notifier_block;
struct mem_cgroup;
struct task_struct;

/*
 * Types of limitations to the nodes from which allocations may occur
 */
enum oom_constraint {
	CONSTRAINT_NONE,
	CONSTRAINT_CPUSET,
	CONSTRAINT_MEMORY_POLICY,
	CONSTRAINT_MEMCG,
};

extern void compare_swap_oom_score_adj(int old_val, int new_val);
extern int test_set_oom_score_adj(int new_val);

extern unsigned long oom_badness(struct task_struct *p,
		struct mem_cgroup *memcg, const nodemask_t *nodemask,
		unsigned long totalpages);
extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);

extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
		int order, nodemask_t *mask, bool force_kill);
extern int register_oom_notifier(struct notifier_block *nb);
extern int unregister_oom_notifier(struct notifier_block *nb);

extern bool oom_killer_disabled;

static inline void oom_killer_disable(void)
{
	oom_killer_disabled = true;
}

static inline void oom_killer_enable(void)
{
	oom_killer_disabled = false;
}

extern struct task_struct *find_lock_task_mm(struct task_struct *p);

/* sysctls */
extern int sysctl_oom_dump_tasks;
extern int sysctl_oom_kill_allocating_task;
extern int sysctl_panic_on_oom;
#endif /* __KERNEL__*/
#endif /* _INCLUDE_LINUX_OOM_H */
Commit	Line	Data
8ac773b4 AD	1	#ifndef __INCLUDE_LINUX_OOM_H
	2	#define __INCLUDE_LINUX_OOM_H
	3
a63d83f4	4	/*
51b1bd2a DR	5	* /proc/<pid>/oom_adj is deprecated, see
	6	* Documentation/feature-removal-schedule.txt.
	7	*
a63d83f4 DR	8	* /proc/<pid>/oom_adj set to -17 protects from the oom-killer
a63d83f4 DR	9	*/
8ac773b4 AD	10	#define OOM_DISABLE (-17)
	11	/* inclusive */
	12	#define OOM_ADJUST_MIN (-16)
	13	#define OOM_ADJUST_MAX 15
	14
a63d83f4 DR	15	/*
	16	* /proc/<pid>/oom_score_adj set to OOM_SCORE_ADJ_MIN disables oom killing for
	17	* pid.
	18	*/
	19	#define OOM_SCORE_ADJ_MIN (-1000)
	20	#define OOM_SCORE_ADJ_MAX 1000
	21
5a3135c2 DR	22	#ifdef __KERNEL__
5a3135c2 DR	23
a63d83f4	24	#include <linux/sched.h>
172acf60	25	#include <linux/types.h>
4365a567	26	#include <linux/nodemask.h>
172acf60 DR	27
	28	struct zonelist;
	29	struct notifier_block;
74bcbf40 AM	30	struct mem_cgroup;
74bcbf40 AM	31	struct task_struct;
172acf60	32
70e24bdf DR	33	/*
	34	* Types of limitations to the nodes from which allocations may occur
	35	*/
	36	enum oom_constraint {
	37	CONSTRAINT_NONE,
	38	CONSTRAINT_CPUSET,
	39	CONSTRAINT_MEMORY_POLICY,
309ed882	40	CONSTRAINT_MEMCG,
70e24bdf DR	41	};
70e24bdf DR	42
43362a49	43	extern void compare_swap_oom_score_adj(int old_val, int new_val);
72788c38 DR	44	extern int test_set_oom_score_adj(int new_val);
72788c38 DR	45
a7f638f9 DR	46	extern unsigned long oom_badness(struct task_struct *p,
	47	struct mem_cgroup memcg, const nodemask_t nodemask,
	48	unsigned long totalpages);
ff321fea	49	extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
dd1a239f	50	extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
098d7f12	51
4365a567	52	extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
08ab9b10	53	int order, nodemask_t *mask, bool force_kill);
5a3135c2 DR	54	extern int register_oom_notifier(struct notifier_block *nb);
	55	extern int unregister_oom_notifier(struct notifier_block *nb);
	56
1a8670a2 AD	57	extern bool oom_killer_disabled;
	58
	59	static inline void oom_killer_disable(void)
	60	{
	61	oom_killer_disabled = true;
	62	}
	63
	64	static inline void oom_killer_enable(void)
	65	{
	66	oom_killer_disabled = false;
	67	}
8e4228e1	68
158e0a2d KH	69	extern struct task_struct find_lock_task_mm(struct task_struct p);
158e0a2d KH	70
8e4228e1 DR	71	/* sysctls */
	72	extern int sysctl_oom_dump_tasks;
	73	extern int sysctl_oom_kill_allocating_task;
	74	extern int sysctl_panic_on_oom;
5a3135c2 DR	75	#endif /* __KERNEL__*/
5a3135c2 DR	76	#endif /* _INCLUDE_LINUX_OOM_H */