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
53extern struct mutex oom_lock;
54
55static inline void set_current_oom_origin(void)
56{
57 current->signal->oom_flag_origin = true;
58}
59
60static inline void clear_current_oom_origin(void)
61{
62 current->signal->oom_flag_origin = false;
63}
64
65static inline bool oom_task_origin(const struct task_struct *p)
66{
67 return p->signal->oom_flag_origin;
68}
69
70extern void mark_oom_victim(struct task_struct *tsk);
71
72#ifdef CONFIG_MMU
73extern void try_oom_reaper(struct task_struct *tsk);
74#else
75static inline void try_oom_reaper(struct task_struct *tsk)
76{
77}
78#endif
79
80extern unsigned long oom_badness(struct task_struct *p,
81 struct mem_cgroup *memcg, const nodemask_t *nodemask,
82 unsigned long totalpages);
83
84extern void oom_kill_process(struct oom_control *oc, struct task_struct *p,
85 unsigned int points, unsigned long totalpages,
86 struct mem_cgroup *memcg, const char *message);
87
88extern void check_panic_on_oom(struct oom_control *oc,
89 enum oom_constraint constraint,
90 struct mem_cgroup *memcg);
91
92extern enum oom_scan_t oom_scan_process_thread(struct oom_control *oc,
93 struct task_struct *task, unsigned long totalpages);
94
95extern bool out_of_memory(struct oom_control *oc);
96
97extern void exit_oom_victim(struct task_struct *tsk);
98
99extern int register_oom_notifier(struct notifier_block *nb);
100extern int unregister_oom_notifier(struct notifier_block *nb);
101
102extern bool oom_killer_disabled;
103extern bool oom_killer_disable(void);
104extern void oom_killer_enable(void);
105
106extern struct task_struct *find_lock_task_mm(struct task_struct *p);
107
108static inline bool task_will_free_mem(struct task_struct *task)
109{
110 struct signal_struct *sig = task->signal;
111
112 /*
113 * A coredumping process may sleep for an extended period in exit_mm(),
114 * so the oom killer cannot assume that the process will promptly exit
115 * and release memory.
116 */
117 if (sig->flags & SIGNAL_GROUP_COREDUMP)
118 return false;
119
120 if (!(task->flags & PF_EXITING))
121 return false;
122
123 /* Make sure that the whole thread group is going down */
124 if (!thread_group_empty(task) && !(sig->flags & SIGNAL_GROUP_EXIT))
125 return false;
126
127 return true;
128}
129
130/* sysctls */
131extern int sysctl_oom_dump_tasks;
132extern int sysctl_oom_kill_allocating_task;
133extern int sysctl_panic_on_oom;
134#endif /* _INCLUDE_LINUX_OOM_H */