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
28 struct zonelist;
29 struct notifier_block;
30 struct mem_cgroup;
31 struct task_struct;
32
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,
40 CONSTRAINT_MEMCG,
41 };
42
43 extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
44 const nodemask_t *nodemask, unsigned long totalpages);
45 extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
46 extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
47
48 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
49 int order, nodemask_t *mask);
50 extern int register_oom_notifier(struct notifier_block *nb);
51 extern int unregister_oom_notifier(struct notifier_block *nb);
52
53 extern bool oom_killer_disabled;
54
oom_killer_disable(void)55 static inline void oom_killer_disable(void)
56 {
57 oom_killer_disabled = true;
58 }
59
oom_killer_enable(void)60 static inline void oom_killer_enable(void)
61 {
62 oom_killer_disabled = false;
63 }
64
65 /* The badness from the OOM killer */
66 extern unsigned long badness(struct task_struct *p, struct mem_cgroup *mem,
67 const nodemask_t *nodemask, unsigned long uptime);
68
69 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
70
71 /* sysctls */
72 extern int sysctl_oom_dump_tasks;
73 extern int sysctl_oom_kill_allocating_task;
74 extern int sysctl_panic_on_oom;
75 #endif /* __KERNEL__*/
76 #endif /* _INCLUDE_LINUX_OOM_H */
77