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 /* Used to determine cpuset and node locality requirement */
27 const gfp_t gfp_mask;
28
29 /*
30 * order == -1 means the oom kill is required by sysrq, otherwise only
31 * for display purposes.
32 */
33 const int order;
34};
35
36/*
37 * Types of limitations to the nodes from which allocations may occur
38 */
39enum oom_constraint {
40 CONSTRAINT_NONE,
41 CONSTRAINT_CPUSET,
42 CONSTRAINT_MEMORY_POLICY,
43 CONSTRAINT_MEMCG,
44};
45
46enum oom_scan_t {
47 OOM_SCAN_OK, /* scan thread and find its badness */
48 OOM_SCAN_CONTINUE, /* do not consider thread for oom kill */
49 OOM_SCAN_ABORT, /* abort the iteration and return */
50 OOM_SCAN_SELECT, /* always select this thread first */
51};
52
53/* Thread is the potential origin of an oom condition; kill first on oom */
54#define OOM_FLAG_ORIGIN ((__force oom_flags_t)0x1)
55
56extern struct mutex oom_lock;
57
58static inline void set_current_oom_origin(void)
59{
60 current->signal->oom_flags |= OOM_FLAG_ORIGIN;
61}
62
63static inline void clear_current_oom_origin(void)
64{
65 current->signal->oom_flags &= ~OOM_FLAG_ORIGIN;
66}
67
68static inline bool oom_task_origin(const struct task_struct *p)
69{
70 return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN);
71}
72
73extern void mark_oom_victim(struct task_struct *tsk);
74
75extern unsigned long oom_badness(struct task_struct *p,
76 struct mem_cgroup *memcg, const nodemask_t *nodemask,
77 unsigned long totalpages);
78
79extern void oom_kill_process(struct oom_control *oc, struct task_struct *p,
80 unsigned int points, unsigned long totalpages,
81 struct mem_cgroup *memcg, const char *message);
82
83extern void check_panic_on_oom(struct oom_control *oc,
84 enum oom_constraint constraint,
85 struct mem_cgroup *memcg);
86
87extern enum oom_scan_t oom_scan_process_thread(struct oom_control *oc,
88 struct task_struct *task, unsigned long totalpages);
89
90extern bool out_of_memory(struct oom_control *oc);
91
92extern void exit_oom_victim(struct task_struct *tsk);
93
94extern int register_oom_notifier(struct notifier_block *nb);
95extern int unregister_oom_notifier(struct notifier_block *nb);
96
97extern bool oom_killer_disabled;
98extern bool oom_killer_disable(void);
99extern void oom_killer_enable(void);
100
101extern struct task_struct *find_lock_task_mm(struct task_struct *p);
102
103static inline bool task_will_free_mem(struct task_struct *task)
104{
105 /*
106 * A coredumping process may sleep for an extended period in exit_mm(),
107 * so the oom killer cannot assume that the process will promptly exit
108 * and release memory.
109 */
110 return (task->flags & PF_EXITING) &&
111 !(task->signal->flags & SIGNAL_GROUP_COREDUMP);
112}
113
114/* sysctls */
115extern int sysctl_oom_dump_tasks;
116extern int sysctl_oom_kill_allocating_task;
117extern int sysctl_panic_on_oom;
118#endif /* _INCLUDE_LINUX_OOM_H */