Linux kernel mirror (for testing)
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linux
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
10struct zonelist;
11struct notifier_block;
12struct mem_cgroup;
13struct task_struct;
14
15/*
16 * Details of the page allocation that triggered the oom killer that are used to
17 * determine what should be killed.
18 */
19struct oom_control {
20 /* Used to determine cpuset */
21 struct zonelist *zonelist;
22
23 /* Used to determine mempolicy */
24 nodemask_t *nodemask;
25
26 /* Memory cgroup in which oom is invoked, or NULL for global oom */
27 struct mem_cgroup *memcg;
28
29 /* 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;
37};
38
39/*
40 * Types of limitations to the nodes from which allocations may occur
41 */
42enum oom_constraint {
43 CONSTRAINT_NONE,
44 CONSTRAINT_CPUSET,
45 CONSTRAINT_MEMORY_POLICY,
46 CONSTRAINT_MEMCG,
47};
48
49enum oom_scan_t {
50 OOM_SCAN_OK, /* scan thread and find its badness */
51 OOM_SCAN_CONTINUE, /* do not consider thread for oom kill */
52 OOM_SCAN_ABORT, /* abort the iteration and return */
53 OOM_SCAN_SELECT, /* always select this thread first */
54};
55
56extern struct mutex oom_lock;
57
58static inline void set_current_oom_origin(void)
59{
60 current->signal->oom_flag_origin = true;
61}
62
63static inline void clear_current_oom_origin(void)
64{
65 current->signal->oom_flag_origin = false;
66}
67
68static inline bool oom_task_origin(const struct task_struct *p)
69{
70 return p->signal->oom_flag_origin;
71}
72
73extern void mark_oom_victim(struct task_struct *tsk);
74
75#ifdef CONFIG_MMU
76extern void wake_oom_reaper(struct task_struct *tsk);
77#else
78static inline void wake_oom_reaper(struct task_struct *tsk)
79{
80}
81#endif
82
83extern unsigned long oom_badness(struct task_struct *p,
84 struct mem_cgroup *memcg, const nodemask_t *nodemask,
85 unsigned long totalpages);
86
87extern void oom_kill_process(struct oom_control *oc, struct task_struct *p,
88 unsigned int points, unsigned long totalpages,
89 const char *message);
90
91extern void check_panic_on_oom(struct oom_control *oc,
92 enum oom_constraint constraint);
93
94extern enum oom_scan_t oom_scan_process_thread(struct oom_control *oc,
95 struct task_struct *task);
96
97extern bool out_of_memory(struct oom_control *oc);
98
99extern void exit_oom_victim(struct task_struct *tsk);
100
101extern int register_oom_notifier(struct notifier_block *nb);
102extern int unregister_oom_notifier(struct notifier_block *nb);
103
104extern bool oom_killer_disabled;
105extern bool oom_killer_disable(void);
106extern void oom_killer_enable(void);
107
108extern struct task_struct *find_lock_task_mm(struct task_struct *p);
109
110bool task_will_free_mem(struct task_struct *task);
111
112/* sysctls */
113extern int sysctl_oom_dump_tasks;
114extern int sysctl_oom_kill_allocating_task;
115extern int sysctl_panic_on_oom;
116#endif /* _INCLUDE_LINUX_OOM_H */