oom.h revision 62ce1c706f817cb9defef3ac2dfdd815149f2968 
1#ifndef __INCLUDE_LINUX_OOM_H
2#define __INCLUDE_LINUX_OOM_H
3
4/*
5 * /proc/<pid>/oom_adj is deprecated, see
6 * Documentation/feature-removal-schedule.txt.
7 *
8 * /proc/<pid>/oom_adj set to -17 protects from the oom-killer
9 */
10#define OOM_DISABLE (-17)
11/* inclusive */
12#define OOM_ADJUST_MIN (-16)
13#define OOM_ADJUST_MAX 15
14
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
22#ifdef __KERNEL__
23
24#include <linux/sched.h>
25#include <linux/types.h>
26#include <linux/nodemask.h>
27
28struct zonelist;
29struct notifier_block;
30struct mem_cgroup;
31struct task_struct;
32
33/*
34 * Types of limitations to the nodes from which allocations may occur
35 */
36enum oom_constraint {
37	CONSTRAINT_NONE,
38	CONSTRAINT_CPUSET,
39	CONSTRAINT_MEMORY_POLICY,
40	CONSTRAINT_MEMCG,
41};
42
43extern void compare_swap_oom_score_adj(int old_val, int new_val);
44extern int test_set_oom_score_adj(int new_val);
45
46extern unsigned long oom_badness(struct task_struct *p,
47		struct mem_cgroup *memcg, const nodemask_t *nodemask,
48		unsigned long totalpages);
49extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
50extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
51
52extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
53				     int order);
54extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
55		int order, nodemask_t *mask, bool force_kill);
56extern int register_oom_notifier(struct notifier_block *nb);
57extern int unregister_oom_notifier(struct notifier_block *nb);
58
59extern bool oom_killer_disabled;
60
61static inline void oom_killer_disable(void)
62{
63	oom_killer_disabled = true;
64}
65
66static inline void oom_killer_enable(void)
67{
68	oom_killer_disabled = false;
69}
70
71extern struct task_struct *find_lock_task_mm(struct task_struct *p);
72
73/* sysctls */
74extern int sysctl_oom_dump_tasks;
75extern int sysctl_oom_kill_allocating_task;
76extern int sysctl_panic_on_oom;
77#endif /* __KERNEL__*/
78#endif /* _INCLUDE_LINUX_OOM_H */
79