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Alexey Dobriyan8ac773b2006-10-19 23:28:32 -07001#ifndef __INCLUDE_LINUX_OOM_H
2#define __INCLUDE_LINUX_OOM_H
3
David Rientjes5a3135c22007-10-16 23:25:53 -07004
David Rientjesa63d83f2010-08-09 17:19:46 -07005#include <linux/sched.h>
David Rientjes172acf62007-10-16 23:25:59 -07006#include <linux/types.h>
KAMEZAWA Hiroyuki4365a562009-12-15 16:45:33 -08007#include <linux/nodemask.h>
David Howells607ca462012-10-13 10:46:48 +01008#include <uapi/linux/oom.h>
David Rientjes172acf62007-10-16 23:25:59 -07009
10struct zonelist;
11struct notifier_block;
Andrew Morton74bcbf42010-08-09 17:19:43 -070012struct mem_cgroup;
13struct task_struct;
David Rientjes172acf62007-10-16 23:25:59 -070014
David Rientjes8989e4c2015-09-08 15:00:44 -070015/*
16 * Details of the page allocation that triggered the oom killer that are used to
17 * determine what should be killed.
18 */
David Rientjes6e0fc462015-09-08 15:00:36 -070019struct oom_control {
David Rientjes8989e4c2015-09-08 15:00:44 -070020 /* Used to determine cpuset */
David Rientjes6e0fc462015-09-08 15:00:36 -070021 struct zonelist *zonelist;
David Rientjes8989e4c2015-09-08 15:00:44 -070022
23 /* Used to determine mempolicy */
24 nodemask_t *nodemask;
25
Vladimir Davydov2a966b72016-07-26 15:22:33 -070026 /* Memory cgroup in which oom is invoked, or NULL for global oom */
27 struct mem_cgroup *memcg;
28
David Rientjes8989e4c2015-09-08 15:00:44 -070029 /* Used to determine cpuset and node locality requirement */
30 const gfp_t gfp_mask;
31
32 /*
33 * order == -1 means the oom kill is required by sysrq, otherwise only
34 * for display purposes.
35 */
36 const int order;
David Rientjes6e0fc462015-09-08 15:00:36 -070037
Vladimir Davydov7c5f64f2016-10-07 16:57:23 -070038 /* Used by oom implementation, do not set */
39 unsigned long totalpages;
40 struct task_struct *chosen;
41 unsigned long chosen_points;
David Rientjes9cbb78b2012-07-31 16:43:44 -070042};
43
Johannes Weinerdc564012015-06-24 16:57:19 -070044extern struct mutex oom_lock;
45
David Rientjese1e12d22012-12-11 16:02:56 -080046static inline void set_current_oom_origin(void)
47{
Tetsuo Handac96fc2d2016-05-23 16:23:57 -070048 current->signal->oom_flag_origin = true;
David Rientjese1e12d22012-12-11 16:02:56 -080049}
50
51static inline void clear_current_oom_origin(void)
52{
Tetsuo Handac96fc2d2016-05-23 16:23:57 -070053 current->signal->oom_flag_origin = false;
David Rientjese1e12d22012-12-11 16:02:56 -080054}
55
56static inline bool oom_task_origin(const struct task_struct *p)
57{
Tetsuo Handac96fc2d2016-05-23 16:23:57 -070058 return p->signal->oom_flag_origin;
David Rientjese1e12d22012-12-11 16:02:56 -080059}
David Rientjes72788c32011-05-24 17:11:40 -070060
Michal Hocko862e3072016-10-07 16:58:57 -070061static inline bool tsk_is_oom_victim(struct task_struct * tsk)
62{
63 return tsk->signal->oom_mm;
64}
65
David Rientjesa7f638f2012-05-29 15:06:47 -070066extern unsigned long oom_badness(struct task_struct *p,
67 struct mem_cgroup *memcg, const nodemask_t *nodemask,
68 unsigned long totalpages);
Michal Hocko5695be12014-10-20 18:12:32 +020069
David Rientjes6e0fc462015-09-08 15:00:36 -070070extern bool out_of_memory(struct oom_control *oc);
Johannes Weiner16e95192015-06-24 16:57:07 -070071
Tetsuo Handa38531202016-10-07 16:59:03 -070072extern void exit_oom_victim(void);
Johannes Weiner16e95192015-06-24 16:57:07 -070073
David Rientjes5a3135c22007-10-16 23:25:53 -070074extern int register_oom_notifier(struct notifier_block *nb);
75extern int unregister_oom_notifier(struct notifier_block *nb);
76
Michal Hocko7d2e7a22016-10-07 16:59:00 -070077extern bool oom_killer_disable(signed long timeout);
Michal Hockoc32b3cb2015-02-11 15:26:24 -080078extern void oom_killer_enable(void);
David Rientjes8e4228e2010-08-09 17:18:56 -070079
KAMEZAWA Hiroyuki158e0a22010-08-10 18:03:00 -070080extern struct task_struct *find_lock_task_mm(struct task_struct *p);
81
David Rientjes8e4228e2010-08-09 17:18:56 -070082/* sysctls */
83extern int sysctl_oom_dump_tasks;
84extern int sysctl_oom_kill_allocating_task;
85extern int sysctl_panic_on_oom;
David Rientjes5a3135c22007-10-16 23:25:53 -070086#endif /* _INCLUDE_LINUX_OOM_H */