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gerrit-public.fairphone.software / kernel / msm-4.9 / 9a72384d86b26cb8a2b25106677e1197f606668f / . / include / linux / oom.h
blob: e8d6e10587233466c666d6be2e3fb21603a82552 [file] [log] [blame]
Alexey Dobriyan8ac773b2006-10-19 23:28:32 -0700[diff] [blame]1#ifndef __INCLUDE_LINUX_OOM_H
2#define __INCLUDE_LINUX_OOM_H
3
David Rientjes5a3135c22007-10-16 23:25:53 -0700[diff] [blame]4
David Rientjesa63d83f2010-08-09 17:19:46 -0700[diff] [blame]5#include <linux/sched.h>
David Rientjes172acf62007-10-16 23:25:59 -0700[diff] [blame]6#include <linux/types.h>
KAMEZAWA Hiroyuki4365a562009-12-15 16:45:33 -0800[diff] [blame]7#include <linux/nodemask.h>
David Howells607ca462012-10-13 10:46:48 +0100[diff] [blame]8#include <uapi/linux/oom.h>
David Rientjes172acf62007-10-16 23:25:59 -0700[diff] [blame]9
10struct zonelist;
11struct notifier_block;
Andrew Morton74bcbf42010-08-09 17:19:43 -0700[diff] [blame]12struct mem_cgroup;
13struct task_struct;
David Rientjes172acf62007-10-16 23:25:59 -0700[diff] [blame]14
David Rientjes70e24bd2007-10-16 23:25:53 -0700[diff] [blame]15/*
16 * Types of limitations to the nodes from which allocations may occur
17 */
18enum oom_constraint {
19 CONSTRAINT_NONE,
20 CONSTRAINT_CPUSET,
21 CONSTRAINT_MEMORY_POLICY,
David Rientjes309ed882010-08-09 17:18:54 -0700[diff] [blame]22 CONSTRAINT_MEMCG,
David Rientjes70e24bd2007-10-16 23:25:53 -0700[diff] [blame]23};
24
David Rientjes9cbb78b2012-07-31 16:43:44 -0700[diff] [blame]25enum oom_scan_t {
26 OOM_SCAN_OK, /* scan thread and find its badness */
27 OOM_SCAN_CONTINUE, /* do not consider thread for oom kill */
28 OOM_SCAN_ABORT, /* abort the iteration and return */
29 OOM_SCAN_SELECT, /* always select this thread first */
30};
31
David Rientjese1e12d22012-12-11 16:02:56 -0800[diff] [blame]32/* Thread is the potential origin of an oom condition; kill first on oom */
33#define OOM_FLAG_ORIGIN ((__force oom_flags_t)0x1)
34
35static inline void set_current_oom_origin(void)
36{
37 current->signal->oom_flags |= OOM_FLAG_ORIGIN;
38}
39
40static inline void clear_current_oom_origin(void)
41{
42 current->signal->oom_flags &= ~OOM_FLAG_ORIGIN;
43}
44
45static inline bool oom_task_origin(const struct task_struct *p)
46{
47 return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN);
48}
David Rientjes72788c32011-05-24 17:11:40 -0700[diff] [blame]49
David Rientjesa7f638f2012-05-29 15:06:47 -0700[diff] [blame]50extern unsigned long oom_badness(struct task_struct *p,
51 struct mem_cgroup *memcg, const nodemask_t *nodemask,
52 unsigned long totalpages);
Michal Hocko5695be12014-10-20 18:12:32 +0200[diff] [blame]53
54extern int oom_kills_count(void);
55extern void note_oom_kill(void);
David Rientjes9cbb78b2012-07-31 16:43:44 -0700[diff] [blame]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
David Rientjese972a072014-08-06 16:07:52 -0700[diff] [blame]61extern bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_flags);
62extern void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_flags);
David Rientjes098d7f12007-10-16 23:25:55 -0700[diff] [blame]63
David Rientjes876aafb2012-07-31 16:43:48 -0700[diff] [blame]64extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
65 int order, const nodemask_t *nodemask);
66
David Rientjes9cbb78b2012-07-31 16:43:44 -0700[diff] [blame]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);
David Rientjes9cbb78b2012-07-31 16:43:44 -0700[diff] [blame]70
KAMEZAWA Hiroyuki4365a562009-12-15 16:45:33 -0800[diff] [blame]71extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
David Rientjes08ab9b12012-03-21 16:34:04 -0700[diff] [blame]72 int order, nodemask_t *mask, bool force_kill);
David Rientjes5a3135c22007-10-16 23:25:53 -0700[diff] [blame]73extern int register_oom_notifier(struct notifier_block *nb);
74extern int unregister_oom_notifier(struct notifier_block *nb);
75
Alexey Dobriyan1a8670a2009-09-21 17:03:09 -0700[diff] [blame]76extern bool oom_killer_disabled;
77
78static inline void oom_killer_disable(void)
79{
80 oom_killer_disabled = true;
81}
82
83static inline void oom_killer_enable(void)
84{
85 oom_killer_disabled = false;
86}
David Rientjes8e4228e2010-08-09 17:18:56 -0700[diff] [blame]87
Qiang Huangb9921ec2013-11-12 15:07:22 -0800[diff] [blame]88static inline bool oom_gfp_allowed(gfp_t gfp_mask)
89{
90 return (gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY);
91}
92
KAMEZAWA Hiroyuki158e0a22010-08-10 18:03:00 -0700[diff] [blame]93extern struct task_struct *find_lock_task_mm(struct task_struct *p);
94
David Rientjes8e4228e2010-08-09 17:18:56 -0700[diff] [blame]95/* sysctls */
96extern int sysctl_oom_dump_tasks;
97extern int sysctl_oom_kill_allocating_task;
98extern int sysctl_panic_on_oom;
David Rientjes5a3135c22007-10-16 23:25:53 -0700[diff] [blame]99#endif /* _INCLUDE_LINUX_OOM_H */