oom.h revision a63d83f427fbce97a6cea0db2e64b0eb8435cd10 
1#ifndef __INCLUDE_LINUX_OOM_H
2#define __INCLUDE_LINUX_OOM_H
3
4/*
5 * /proc/<pid>/oom_adj set to -17 protects from the oom-killer
6 */
7#define OOM_DISABLE (-17)
8/* inclusive */
9#define OOM_ADJUST_MIN (-16)
10#define OOM_ADJUST_MAX 15
11
12/*
13 * /proc/<pid>/oom_score_adj set to OOM_SCORE_ADJ_MIN disables oom killing for
14 * pid.
15 */
16#define OOM_SCORE_ADJ_MIN	(-1000)
17#define OOM_SCORE_ADJ_MAX	1000
18
19#ifdef __KERNEL__
20
21#include <linux/sched.h>
22#include <linux/types.h>
23#include <linux/nodemask.h>
24
25struct zonelist;
26struct notifier_block;
27struct mem_cgroup;
28struct task_struct;
29
30/*
31 * Types of limitations to the nodes from which allocations may occur
32 */
33enum oom_constraint {
34	CONSTRAINT_NONE,
35	CONSTRAINT_CPUSET,
36	CONSTRAINT_MEMORY_POLICY,
37	CONSTRAINT_MEMCG,
38};
39
40extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
41			const nodemask_t *nodemask, unsigned long totalpages);
42extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
43extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
44
45extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
46		int order, nodemask_t *mask);
47extern int register_oom_notifier(struct notifier_block *nb);
48extern int unregister_oom_notifier(struct notifier_block *nb);
49
50extern bool oom_killer_disabled;
51
52static inline void oom_killer_disable(void)
53{
54	oom_killer_disabled = true;
55}
56
57static inline void oom_killer_enable(void)
58{
59	oom_killer_disabled = false;
60}
61
62/* The badness from the OOM killer */
63extern unsigned long badness(struct task_struct *p, struct mem_cgroup *mem,
64		      const nodemask_t *nodemask, unsigned long uptime);
65
66/* sysctls */
67extern int sysctl_oom_dump_tasks;
68extern int sysctl_oom_kill_allocating_task;
69extern int sysctl_panic_on_oom;
70#endif /* __KERNEL__*/
71#endif /* _INCLUDE_LINUX_OOM_H */
72