Commit | Line | Data |
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8ac773b4 AD |
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> |
172acf60 DR |
9 | |
10 | struct zonelist; | |
11 | struct notifier_block; | |
74bcbf40 AM |
12 | struct mem_cgroup; |
13 | struct task_struct; | |
172acf60 | 14 | |
70e24bdf DR |
15 | /* |
16 | * Types of limitations to the nodes from which allocations may occur | |
17 | */ | |
18 | enum oom_constraint { | |
19 | CONSTRAINT_NONE, | |
20 | CONSTRAINT_CPUSET, | |
21 | CONSTRAINT_MEMORY_POLICY, | |
309ed882 | 22 | CONSTRAINT_MEMCG, |
70e24bdf DR |
23 | }; |
24 | ||
9cbb78bb DR |
25 | enum 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 | ||
e1e12d2f DR |
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 | ||
35 | static inline void set_current_oom_origin(void) | |
36 | { | |
37 | current->signal->oom_flags |= OOM_FLAG_ORIGIN; | |
38 | } | |
39 | ||
40 | static inline void clear_current_oom_origin(void) | |
41 | { | |
42 | current->signal->oom_flags &= ~OOM_FLAG_ORIGIN; | |
43 | } | |
44 | ||
45 | static inline bool oom_task_origin(const struct task_struct *p) | |
46 | { | |
47 | return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN); | |
48 | } | |
72788c38 | 49 | |
a7f638f9 DR |
50 | extern unsigned long oom_badness(struct task_struct *p, |
51 | struct mem_cgroup *memcg, const nodemask_t *nodemask, | |
52 | unsigned long totalpages); | |
5695be14 MH |
53 | |
54 | extern int oom_kills_count(void); | |
55 | extern void note_oom_kill(void); | |
9cbb78bb DR |
56 | extern 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 | ||
e972a070 DR |
61 | extern bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_flags); |
62 | extern void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_flags); | |
098d7f12 | 63 | |
876aafbf DR |
64 | extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask, |
65 | int order, const nodemask_t *nodemask); | |
66 | ||
9cbb78bb DR |
67 | extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task, |
68 | unsigned long totalpages, const nodemask_t *nodemask, | |
69 | bool force_kill); | |
9cbb78bb | 70 | |
4365a567 | 71 | extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, |
08ab9b10 | 72 | int order, nodemask_t *mask, bool force_kill); |
5a3135c2 DR |
73 | extern int register_oom_notifier(struct notifier_block *nb); |
74 | extern int unregister_oom_notifier(struct notifier_block *nb); | |
75 | ||
1a8670a2 AD |
76 | extern bool oom_killer_disabled; |
77 | ||
78 | static inline void oom_killer_disable(void) | |
79 | { | |
80 | oom_killer_disabled = true; | |
81 | } | |
82 | ||
83 | static inline void oom_killer_enable(void) | |
84 | { | |
85 | oom_killer_disabled = false; | |
86 | } | |
8e4228e1 | 87 | |
158e0a2d KH |
88 | extern struct task_struct *find_lock_task_mm(struct task_struct *p); |
89 | ||
d003f371 ON |
90 | static inline bool task_will_free_mem(struct task_struct *task) |
91 | { | |
92 | /* | |
93 | * A coredumping process may sleep for an extended period in exit_mm(), | |
94 | * so the oom killer cannot assume that the process will promptly exit | |
95 | * and release memory. | |
96 | */ | |
97 | return (task->flags & PF_EXITING) && | |
98 | !(task->signal->flags & SIGNAL_GROUP_COREDUMP); | |
99 | } | |
100 | ||
8e4228e1 DR |
101 | /* sysctls */ |
102 | extern int sysctl_oom_dump_tasks; | |
103 | extern int sysctl_oom_kill_allocating_task; | |
104 | extern int sysctl_panic_on_oom; | |
5a3135c2 | 105 | #endif /* _INCLUDE_LINUX_OOM_H */ |