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1#ifndef __INCLUDE_LINUX_OOM_H
2#define __INCLUDE_LINUX_OOM_H
3
5a3135c2 4
a63d83f4 5#include <linux/sched.h>
172acf60 6#include <linux/types.h>
4365a567 7#include <linux/nodemask.h>
607ca46e 8#include <uapi/linux/oom.h>
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9
10struct zonelist;
11struct notifier_block;
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12struct mem_cgroup;
13struct task_struct;
172acf60 14
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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,
309ed882 22 CONSTRAINT_MEMCG,
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23};
24
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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
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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}
72788c38 49
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50extern void mark_tsk_oom_victim(struct task_struct *tsk);
51
52extern void unmark_oom_victim(void);
53
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54extern unsigned long oom_badness(struct task_struct *p,
55 struct mem_cgroup *memcg, const nodemask_t *nodemask,
56 unsigned long totalpages);
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57
58extern int oom_kills_count(void);
59extern void note_oom_kill(void);
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60extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
61 unsigned int points, unsigned long totalpages,
62 struct mem_cgroup *memcg, nodemask_t *nodemask,
63 const char *message);
64
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65extern bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_flags);
66extern void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_flags);
098d7f12 67
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68extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
69 int order, const nodemask_t *nodemask);
70
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71extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
72 unsigned long totalpages, const nodemask_t *nodemask,
73 bool force_kill);
9cbb78bb 74
c32b3cbe 75extern bool out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
08ab9b10 76 int order, nodemask_t *mask, bool force_kill);
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77extern int register_oom_notifier(struct notifier_block *nb);
78extern int unregister_oom_notifier(struct notifier_block *nb);
79
1a8670a2 80extern bool oom_killer_disabled;
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81extern bool oom_killer_disable(void);
82extern void oom_killer_enable(void);
8e4228e1 83
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84extern struct task_struct *find_lock_task_mm(struct task_struct *p);
85
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86static inline bool task_will_free_mem(struct task_struct *task)
87{
88 /*
89 * A coredumping process may sleep for an extended period in exit_mm(),
90 * so the oom killer cannot assume that the process will promptly exit
91 * and release memory.
92 */
93 return (task->flags & PF_EXITING) &&
94 !(task->signal->flags & SIGNAL_GROUP_COREDUMP);
95}
96
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97/* sysctls */
98extern int sysctl_oom_dump_tasks;
99extern int sysctl_oom_kill_allocating_task;
100extern int sysctl_panic_on_oom;
5a3135c2 101#endif /* _INCLUDE_LINUX_OOM_H */