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oom.h
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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 
10 struct zonelist;
11 struct notifier_block;
12 struct mem_cgroup;
13 struct task_struct;
14 
15 /*
16  * Types of limitations to the nodes from which allocations may occur
17  */
23 };
24 
25 enum 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 extern void compare_swap_oom_score_adj(int old_val, int new_val);
33 extern int test_set_oom_score_adj(int new_val);
34 
35 extern unsigned long oom_badness(struct task_struct *p,
36  struct mem_cgroup *memcg, const nodemask_t *nodemask,
37  unsigned long totalpages);
38 extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
39  unsigned int points, unsigned long totalpages,
40  struct mem_cgroup *memcg, nodemask_t *nodemask,
41  const char *message);
42 
43 extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
44 extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
45 
46 extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
47  int order, const nodemask_t *nodemask);
48 
50  unsigned long totalpages, const nodemask_t *nodemask,
51  bool force_kill);
52 extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
53  int order);
54 
55 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
56  int order, nodemask_t *mask, bool force_kill);
57 extern int register_oom_notifier(struct notifier_block *nb);
58 extern int unregister_oom_notifier(struct notifier_block *nb);
59 
60 extern bool oom_killer_disabled;
61 
62 static inline void oom_killer_disable(void)
63 {
64  oom_killer_disabled = true;
65 }
66 
67 static inline void oom_killer_enable(void)
68 {
69  oom_killer_disabled = false;
70 }
71 
72 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
73 
74 /* sysctls */
75 extern int sysctl_oom_dump_tasks;
77 extern int sysctl_panic_on_oom;
78 #endif /* _INCLUDE_LINUX_OOM_H */