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