Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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
35extern struct mutex oom_lock;
36
37static inline void set_current_oom_origin(void)
38{
39 current->signal->oom_flags |= OOM_FLAG_ORIGIN;
40}
41
42static inline void clear_current_oom_origin(void)
43{
44 current->signal->oom_flags &= ~OOM_FLAG_ORIGIN;
45}
46
47static inline bool oom_task_origin(const struct task_struct *p)
48{
49 return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN);
50}
51
52extern void mark_oom_victim(struct task_struct *tsk);
53
54extern unsigned long oom_badness(struct task_struct *p,
55 struct mem_cgroup *memcg, const nodemask_t *nodemask,
56 unsigned long totalpages);
57
58extern int oom_kills_count(void);
59extern void note_oom_kill(void);
60extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
61 unsigned int points, unsigned long totalpages,
62 struct mem_cgroup *memcg, nodemask_t *nodemask,
63 const char *message);
64
65extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
66 int order, const nodemask_t *nodemask,
67 struct mem_cgroup *memcg);
68
69extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
70 unsigned long totalpages, const nodemask_t *nodemask,
71 bool force_kill);
72
73extern bool out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
74 int order, nodemask_t *mask, bool force_kill);
75
76extern void exit_oom_victim(void);
77
78extern int register_oom_notifier(struct notifier_block *nb);
79extern int unregister_oom_notifier(struct notifier_block *nb);
80
81extern bool oom_killer_disabled;
82extern bool oom_killer_disable(void);
83extern void oom_killer_enable(void);
84
85extern struct task_struct *find_lock_task_mm(struct task_struct *p);
86
87static inline bool task_will_free_mem(struct task_struct *task)
88{
89 /*
90 * A coredumping process may sleep for an extended period in exit_mm(),
91 * so the oom killer cannot assume that the process will promptly exit
92 * and release memory.
93 */
94 return (task->flags & PF_EXITING) &&
95 !(task->signal->flags & SIGNAL_GROUP_COREDUMP);
96}
97
98/* sysctls */
99extern int sysctl_oom_dump_tasks;
100extern int sysctl_oom_kill_allocating_task;
101extern int sysctl_panic_on_oom;
102#endif /* _INCLUDE_LINUX_OOM_H */