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 * Details of the page allocation that triggered the oom killer that are used to
17 * determine what should be killed.
20 /* Used to determine cpuset */
21 struct zonelist
*zonelist
;
23 /* Used to determine mempolicy */
26 /* Used to determine cpuset and node locality requirement */
30 * order == -1 means the oom kill is required by sysrq, otherwise only
31 * for display purposes.
37 * Types of limitations to the nodes from which allocations may occur
42 CONSTRAINT_MEMORY_POLICY
,
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 */
53 extern struct mutex oom_lock
;
55 static inline void set_current_oom_origin(void)
57 current
->signal
->oom_flag_origin
= true;
60 static inline void clear_current_oom_origin(void)
62 current
->signal
->oom_flag_origin
= false;
65 static inline bool oom_task_origin(const struct task_struct
*p
)
67 return p
->signal
->oom_flag_origin
;
70 extern void mark_oom_victim(struct task_struct
*tsk
);
73 extern void try_oom_reaper(struct task_struct
*tsk
);
75 static inline void try_oom_reaper(struct task_struct
*tsk
)
80 extern unsigned long oom_badness(struct task_struct
*p
,
81 struct mem_cgroup
*memcg
, const nodemask_t
*nodemask
,
82 unsigned long totalpages
);
84 extern 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
);
88 extern void check_panic_on_oom(struct oom_control
*oc
,
89 enum oom_constraint constraint
,
90 struct mem_cgroup
*memcg
);
92 extern enum oom_scan_t
oom_scan_process_thread(struct oom_control
*oc
,
93 struct task_struct
*task
, unsigned long totalpages
);
95 extern bool out_of_memory(struct oom_control
*oc
);
97 extern void exit_oom_victim(struct task_struct
*tsk
);
99 extern int register_oom_notifier(struct notifier_block
*nb
);
100 extern int unregister_oom_notifier(struct notifier_block
*nb
);
102 extern bool oom_killer_disabled
;
103 extern bool oom_killer_disable(void);
104 extern void oom_killer_enable(void);
106 extern struct task_struct
*find_lock_task_mm(struct task_struct
*p
);
108 static inline bool task_will_free_mem(struct task_struct
*task
)
110 struct signal_struct
*sig
= task
->signal
;
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.
117 if (sig
->flags
& SIGNAL_GROUP_COREDUMP
)
120 if (!(task
->flags
& PF_EXITING
))
123 /* Make sure that the whole thread group is going down */
124 if (!thread_group_empty(task
) && !(sig
->flags
& SIGNAL_GROUP_EXIT
))
131 extern int sysctl_oom_dump_tasks
;
132 extern int sysctl_oom_kill_allocating_task
;
133 extern int sysctl_panic_on_oom
;
134 #endif /* _INCLUDE_LINUX_OOM_H */