linux/include/linux/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
  10struct zonelist;
  11struct notifier_block;
  12struct mem_cgroup;
  13struct task_struct;
  14
  15/*
  16 * Types of limitations to the nodes from which allocations may occur
  17 */
  18enum oom_constraint {
  19        CONSTRAINT_NONE,
  20        CONSTRAINT_CPUSET,
  21        CONSTRAINT_MEMORY_POLICY,
  22        CONSTRAINT_MEMCG,
  23};
  24
  25enum 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
  32extern void compare_swap_oom_score_adj(int old_val, int new_val);
  33extern int test_set_oom_score_adj(int new_val);
  34
  35extern unsigned long oom_badness(struct task_struct *p,
  36                struct mem_cgroup *memcg, const nodemask_t *nodemask,
  37                unsigned long totalpages);
  38extern 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
  43extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  44extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  45
  46extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
  47                               int order, const nodemask_t *nodemask);
  48
  49extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
  50                unsigned long totalpages, const nodemask_t *nodemask,
  51                bool force_kill);
  52extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
  53                                     int order);
  54
  55extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
  56                int order, nodemask_t *mask, bool force_kill);
  57extern int register_oom_notifier(struct notifier_block *nb);
  58extern int unregister_oom_notifier(struct notifier_block *nb);
  59
  60extern bool oom_killer_disabled;
  61
  62static inline void oom_killer_disable(void)
  63{
  64        oom_killer_disabled = true;
  65}
  66
  67static inline void oom_killer_enable(void)
  68{
  69        oom_killer_disabled = false;
  70}
  71
  72extern struct task_struct *find_lock_task_mm(struct task_struct *p);
  73
  74/* sysctls */
  75extern int sysctl_oom_dump_tasks;
  76extern int sysctl_oom_kill_allocating_task;
  77extern int sysctl_panic_on_oom;
  78#endif /* _INCLUDE_LINUX_OOM_H */
  79
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