1 #ifndef __INCLUDE_LINUX_OOM_H
2 #define __INCLUDE_LINUX_OOM_H
5 #include <linux/sched.h>
6 #include <linux/types.h>
7 #include <linux/nodemask.h>
8 #include <uapi/linux/oom.h>
11 struct notifier_block;
16 struct zonelist *zonelist;
24 * Types of limitations to the nodes from which allocations may occur
29 CONSTRAINT_MEMORY_POLICY,
34 OOM_SCAN_OK, /* scan thread and find its badness */
35 OOM_SCAN_CONTINUE, /* do not consider thread for oom kill */
36 OOM_SCAN_ABORT, /* abort the iteration and return */
37 OOM_SCAN_SELECT, /* always select this thread first */
40 /* Thread is the potential origin of an oom condition; kill first on oom */
41 #define OOM_FLAG_ORIGIN ((__force oom_flags_t)0x1)
43 extern struct mutex oom_lock;
45 static inline void set_current_oom_origin(void)
47 current->signal->oom_flags |= OOM_FLAG_ORIGIN;
50 static inline void clear_current_oom_origin(void)
52 current->signal->oom_flags &= ~OOM_FLAG_ORIGIN;
55 static inline bool oom_task_origin(const struct task_struct *p)
57 return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN);
60 extern void mark_oom_victim(struct task_struct *tsk);
62 extern unsigned long oom_badness(struct task_struct *p,
63 struct mem_cgroup *memcg, const nodemask_t *nodemask,
64 unsigned long totalpages);
66 extern int oom_kills_count(void);
67 extern void note_oom_kill(void);
68 extern void oom_kill_process(struct oom_control *oc, struct task_struct *p,
69 unsigned int points, unsigned long totalpages,
70 struct mem_cgroup *memcg, const char *message);
72 extern void check_panic_on_oom(struct oom_control *oc,
73 enum oom_constraint constraint,
74 struct mem_cgroup *memcg);
76 extern enum oom_scan_t oom_scan_process_thread(struct oom_control *oc,
77 struct task_struct *task, unsigned long totalpages);
79 extern bool out_of_memory(struct oom_control *oc);
81 extern void exit_oom_victim(void);
83 extern int register_oom_notifier(struct notifier_block *nb);
84 extern int unregister_oom_notifier(struct notifier_block *nb);
86 extern bool oom_killer_disabled;
87 extern bool oom_killer_disable(void);
88 extern void oom_killer_enable(void);
90 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
92 static inline bool task_will_free_mem(struct task_struct *task)
95 * A coredumping process may sleep for an extended period in exit_mm(),
96 * so the oom killer cannot assume that the process will promptly exit
99 return (task->flags & PF_EXITING) &&
100 !(task->signal->flags & SIGNAL_GROUP_COREDUMP);
104 extern int sysctl_oom_dump_tasks;
105 extern int sysctl_oom_kill_allocating_task;
106 extern int sysctl_panic_on_oom;
107 #endif /* _INCLUDE_LINUX_OOM_H */