mm, oom: change type of oom_score_adj to short
[linux-3.10.git] / include / linux / oom.h
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  */
18 enum oom_constraint {
19         CONSTRAINT_NONE,
20         CONSTRAINT_CPUSET,
21         CONSTRAINT_MEMORY_POLICY,
22         CONSTRAINT_MEMCG,
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(short old_val, short new_val);
33 extern short test_set_oom_score_adj(short 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
49 extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
50                 unsigned long totalpages, const nodemask_t *nodemask,
51                 bool force_kill);
52
53 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
54                 int order, nodemask_t *mask, bool force_kill);
55 extern int register_oom_notifier(struct notifier_block *nb);
56 extern int unregister_oom_notifier(struct notifier_block *nb);
57
58 extern bool oom_killer_disabled;
59
60 static inline void oom_killer_disable(void)
61 {
62         oom_killer_disabled = true;
63 }
64
65 static inline void oom_killer_enable(void)
66 {
67         oom_killer_disabled = false;
68 }
69
70 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
71
72 /* sysctls */
73 extern int sysctl_oom_dump_tasks;
74 extern int sysctl_oom_kill_allocating_task;
75 extern int sysctl_panic_on_oom;
76 #endif /* _INCLUDE_LINUX_OOM_H */