Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef __INCLUDE_LINUX_OOM_H
2#define __INCLUDE_LINUX_OOM_H
3
4
5#include <linux/sched/signal.h>
6#include <linux/types.h>
7#include <linux/nodemask.h>
8#include <uapi/linux/oom.h>
9#include <linux/sched/coredump.h> /* MMF_* */
10#include <linux/mm.h> /* VM_FAULT* */
11
12struct zonelist;
13struct notifier_block;
14struct mem_cgroup;
15struct task_struct;
16
17/*
18 * Details of the page allocation that triggered the oom killer that are used to
19 * determine what should be killed.
20 */
21struct oom_control {
22 /* Used to determine cpuset */
23 struct zonelist *zonelist;
24
25 /* Used to determine mempolicy */
26 nodemask_t *nodemask;
27
28 /* Memory cgroup in which oom is invoked, or NULL for global oom */
29 struct mem_cgroup *memcg;
30
31 /* Used to determine cpuset and node locality requirement */
32 const gfp_t gfp_mask;
33
34 /*
35 * order == -1 means the oom kill is required by sysrq, otherwise only
36 * for display purposes.
37 */
38 const int order;
39
40 /* Used by oom implementation, do not set */
41 unsigned long totalpages;
42 struct task_struct *chosen;
43 unsigned long chosen_points;
44};
45
46extern struct mutex oom_lock;
47
48static inline void set_current_oom_origin(void)
49{
50 current->signal->oom_flag_origin = true;
51}
52
53static inline void clear_current_oom_origin(void)
54{
55 current->signal->oom_flag_origin = false;
56}
57
58static inline bool oom_task_origin(const struct task_struct *p)
59{
60 return p->signal->oom_flag_origin;
61}
62
63static inline bool tsk_is_oom_victim(struct task_struct * tsk)
64{
65 return tsk->signal->oom_mm;
66}
67
68/*
69 * Checks whether a page fault on the given mm is still reliable.
70 * This is no longer true if the oom reaper started to reap the
71 * address space which is reflected by MMF_UNSTABLE flag set in
72 * the mm. At that moment any !shared mapping would lose the content
73 * and could cause a memory corruption (zero pages instead of the
74 * original content).
75 *
76 * User should call this before establishing a page table entry for
77 * a !shared mapping and under the proper page table lock.
78 *
79 * Return 0 when the PF is safe VM_FAULT_SIGBUS otherwise.
80 */
81static inline int check_stable_address_space(struct mm_struct *mm)
82{
83 if (unlikely(test_bit(MMF_UNSTABLE, &mm->flags)))
84 return VM_FAULT_SIGBUS;
85 return 0;
86}
87
88extern unsigned long oom_badness(struct task_struct *p,
89 struct mem_cgroup *memcg, const nodemask_t *nodemask,
90 unsigned long totalpages);
91
92extern bool out_of_memory(struct oom_control *oc);
93
94extern void exit_oom_victim(void);
95
96extern int register_oom_notifier(struct notifier_block *nb);
97extern int unregister_oom_notifier(struct notifier_block *nb);
98
99extern bool oom_killer_disable(signed long timeout);
100extern void oom_killer_enable(void);
101
102extern struct task_struct *find_lock_task_mm(struct task_struct *p);
103
104/* sysctls */
105extern int sysctl_oom_dump_tasks;
106extern int sysctl_oom_kill_allocating_task;
107extern int sysctl_panic_on_oom;
108#endif /* _INCLUDE_LINUX_OOM_H */