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 * Types of limitations to the nodes from which allocations may occur
21 CONSTRAINT_MEMORY_POLICY,
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 */
32 /* Thread is the potential origin of an oom condition; kill first on oom */
33 #define OOM_FLAG_ORIGIN ((__force oom_flags_t)0x1)
35 static inline void set_current_oom_origin(void)
37 current->signal->oom_flags |= OOM_FLAG_ORIGIN;
40 static inline void clear_current_oom_origin(void)
42 current->signal->oom_flags &= ~OOM_FLAG_ORIGIN;
45 static inline bool oom_task_origin(const struct task_struct *p)
47 return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN);
50 extern unsigned long oom_badness(struct task_struct *p,
51 struct mem_cgroup *memcg, const nodemask_t *nodemask,
52 unsigned long totalpages);
53 extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
54 unsigned int points, unsigned long totalpages,
55 struct mem_cgroup *memcg, nodemask_t *nodemask,
58 extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
59 extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
61 extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
62 int order, const nodemask_t *nodemask);
64 extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
65 unsigned long totalpages, const nodemask_t *nodemask,
68 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
69 int order, nodemask_t *mask, bool force_kill);
70 extern int register_oom_notifier(struct notifier_block *nb);
71 extern int unregister_oom_notifier(struct notifier_block *nb);
73 extern bool oom_killer_disabled;
75 static inline void oom_killer_disable(void)
77 oom_killer_disabled = true;
80 static inline void oom_killer_enable(void)
82 oom_killer_disabled = false;
85 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
88 extern int sysctl_oom_dump_tasks;
89 extern int sysctl_oom_kill_allocating_task;
90 extern int sysctl_panic_on_oom;
91 #endif /* _INCLUDE_LINUX_OOM_H */