Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
43enum oom_scan_t {
44 OOM_SCAN_OK, /* scan thread and find its badness */
45 OOM_SCAN_CONTINUE, /* do not consider thread for oom kill */
46 OOM_SCAN_ABORT, /* abort the iteration and return */
47 OOM_SCAN_SELECT, /* always select this thread first */
48};
49
50extern void compare_swap_oom_score_adj(int old_val, int new_val);
51extern int test_set_oom_score_adj(int new_val);
52
53extern unsigned long oom_badness(struct task_struct *p,
54 struct mem_cgroup *memcg, const nodemask_t *nodemask,
55 unsigned long totalpages);
56extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
57 unsigned int points, unsigned long totalpages,
58 struct mem_cgroup *memcg, nodemask_t *nodemask,
59 const char *message);
60
61extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
62extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
63
64extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
65 int order, const nodemask_t *nodemask);
66
67extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
68 unsigned long totalpages, const nodemask_t *nodemask,
69 bool force_kill);
70extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
71 int order);
72
73extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
74 int order, nodemask_t *mask, bool force_kill);
75extern int register_oom_notifier(struct notifier_block *nb);
76extern int unregister_oom_notifier(struct notifier_block *nb);
77
78extern bool oom_killer_disabled;
79
80static inline void oom_killer_disable(void)
81{
82 oom_killer_disabled = true;
83}
84
85static inline void oom_killer_enable(void)
86{
87 oom_killer_disabled = false;
88}
89
90extern struct task_struct *find_lock_task_mm(struct task_struct *p);
91
92/* sysctls */
93extern int sysctl_oom_dump_tasks;
94extern int sysctl_oom_kill_allocating_task;
95extern int sysctl_panic_on_oom;
96#endif /* __KERNEL__*/
97#endif /* _INCLUDE_LINUX_OOM_H */