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 void compare_swap_oom_score_adj(int old_val, int new_val);
44 extern int test_set_oom_score_adj(int new_val);
45
46 extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
47 const nodemask_t *nodemask, unsigned long totalpages);
48 extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
49 extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
50
51 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
52 int order, nodemask_t *mask, bool force_kill);
53 extern int register_oom_notifier(struct notifier_block *nb);
54 extern int unregister_oom_notifier(struct notifier_block *nb);
55
56 extern bool oom_killer_disabled;
57
oom_killer_disable(void)58 static inline void oom_killer_disable(void)
59 {
60 oom_killer_disabled = true;
61 }
62
oom_killer_enable(void)63 static inline void oom_killer_enable(void)
64 {
65 oom_killer_disabled = false;
66 }
67
68 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
69
70 /* sysctls */
71 extern int sysctl_oom_dump_tasks;
72 extern int sysctl_oom_kill_allocating_task;
73 extern int sysctl_panic_on_oom;
74 #endif /* __KERNEL__*/
75 #endif /* _INCLUDE_LINUX_OOM_H */
76