oom.h revision e1e12d2f3104be886073ac6c5c4678f30b1b9e51 
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 * 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,
22	CONSTRAINT_MEMCG,
23};
24
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
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}
49
50extern unsigned long oom_badness(struct task_struct *p,
51		struct mem_cgroup *memcg, const nodemask_t *nodemask,
52		unsigned long totalpages);
53extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
54			     unsigned int points, unsigned long totalpages,
55			     struct mem_cgroup *memcg, nodemask_t *nodemask,
56			     const char *message);
57
58extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
59extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
60
61extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
62			       int order, const nodemask_t *nodemask);
63
64extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
65		unsigned long totalpages, const nodemask_t *nodemask,
66		bool force_kill);
67
68extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
69		int order, nodemask_t *mask, bool force_kill);
70extern int register_oom_notifier(struct notifier_block *nb);
71extern int unregister_oom_notifier(struct notifier_block *nb);
72
73extern bool oom_killer_disabled;
74
75static inline void oom_killer_disable(void)
76{
77	oom_killer_disabled = true;
78}
79
80static inline void oom_killer_enable(void)
81{
82	oom_killer_disabled = false;
83}
84
85extern struct task_struct *find_lock_task_mm(struct task_struct *p);
86
87/* sysctls */
88extern int sysctl_oom_dump_tasks;
89extern int sysctl_oom_kill_allocating_task;
90extern int sysctl_panic_on_oom;
91#endif /* _INCLUDE_LINUX_OOM_H */
92