Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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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 * 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);
53
54extern int oom_kills_count(void);
55extern void note_oom_kill(void);
56extern 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
61extern bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_flags);
62extern void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_flags);
63
64extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
65 int order, const nodemask_t *nodemask);
66
67extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
68 unsigned long totalpages, const nodemask_t *nodemask,
69 bool force_kill);
70
71extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
72 int order, nodemask_t *mask, bool force_kill);
73extern int register_oom_notifier(struct notifier_block *nb);
74extern int unregister_oom_notifier(struct notifier_block *nb);
75
76extern bool oom_killer_disabled;
77
78static inline void oom_killer_disable(void)
79{
80 oom_killer_disabled = true;
81}
82
83static inline void oom_killer_enable(void)
84{
85 oom_killer_disabled = false;
86}
87
88extern struct task_struct *find_lock_task_mm(struct task_struct *p);
89
90static 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
101/* sysctls */
102extern int sysctl_oom_dump_tasks;
103extern int sysctl_oom_kill_allocating_task;
104extern int sysctl_panic_on_oom;
105#endif /* _INCLUDE_LINUX_OOM_H */