oom.h revision 74bcbf40546bb7500f2a7ba4ff3cc056a6bd004a 
1#ifndef __INCLUDE_LINUX_OOM_H
2#define __INCLUDE_LINUX_OOM_H
3
4/* /proc/<pid>/oom_adj set to -17 protects from the oom-killer */
5#define OOM_DISABLE (-17)
6/* inclusive */
7#define OOM_ADJUST_MIN (-16)
8#define OOM_ADJUST_MAX 15
9
10#ifdef __KERNEL__
11
12#include <linux/types.h>
13#include <linux/nodemask.h>
14
15struct zonelist;
16struct notifier_block;
17struct mem_cgroup;
18struct task_struct;
19
20/*
21 * Types of limitations to the nodes from which allocations may occur
22 */
23enum oom_constraint {
24	CONSTRAINT_NONE,
25	CONSTRAINT_CPUSET,
26	CONSTRAINT_MEMORY_POLICY,
27	CONSTRAINT_MEMCG,
28};
29
30extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
31extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
32
33extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
34		int order, nodemask_t *mask);
35extern int register_oom_notifier(struct notifier_block *nb);
36extern int unregister_oom_notifier(struct notifier_block *nb);
37
38extern bool oom_killer_disabled;
39
40static inline void oom_killer_disable(void)
41{
42	oom_killer_disabled = true;
43}
44
45static inline void oom_killer_enable(void)
46{
47	oom_killer_disabled = false;
48}
49
50/* The badness from the OOM killer */
51extern unsigned long badness(struct task_struct *p, struct mem_cgroup *mem,
52		      const nodemask_t *nodemask, unsigned long uptime);
53
54/* sysctls */
55extern int sysctl_oom_dump_tasks;
56extern int sysctl_oom_kill_allocating_task;
57extern int sysctl_panic_on_oom;
58#endif /* __KERNEL__*/
59#endif /* _INCLUDE_LINUX_OOM_H */
60