linux/include/linux/oom.h
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   1#ifndef __INCLUDE_LINUX_OOM_H
   2#define __INCLUDE_LINUX_OOM_H
   3
   4/*
   5 * /proc/<pid>/oom_adj is deprecated, see
   6 * Documentation/feature-removal-schedule.txt.
   7 *
   8 * /proc/<pid>/oom_adj set to -17 protects from the oom-killer
   9 */
  10#define OOM_DISABLE (-17)
  11/* inclusive */
  12#define OOM_ADJUST_MIN (-16)
  13#define OOM_ADJUST_MAX 15
  14
  15/*
  16 * /proc/<pid>/oom_score_adj set to OOM_SCORE_ADJ_MIN disables oom killing for
  17 * pid.
  18 */
  19#define OOM_SCORE_ADJ_MIN       (-1000)
  20#define OOM_SCORE_ADJ_MAX       1000
  21
  22#ifdef __KERNEL__
  23
  24#include <linux/sched.h>
  25#include <linux/types.h>
  26#include <linux/nodemask.h>
  27
  28struct zonelist;
  29struct notifier_block;
  30struct mem_cgroup;
  31struct task_struct;
  32
  33/*
  34 * Types of limitations to the nodes from which allocations may occur
  35 */
  36enum oom_constraint {
  37        CONSTRAINT_NONE,
  38        CONSTRAINT_CPUSET,
  39        CONSTRAINT_MEMORY_POLICY,
  40        CONSTRAINT_MEMCG,
  41};
  42
  43enum oom_scan_t {
  44        OOM_SCAN_OK,            /* scan thread and find its badness */
  45        OOM_SCAN_CONTINUE,      /* do not consider thread for oom kill */
  46        OOM_SCAN_ABORT,         /* abort the iteration and return */
  47        OOM_SCAN_SELECT,        /* always select this thread first */
  48};
  49
  50extern void compare_swap_oom_score_adj(int old_val, int new_val);
  51extern int test_set_oom_score_adj(int new_val);
  52
  53extern unsigned long oom_badness(struct task_struct *p,
  54                struct mem_cgroup *memcg, const nodemask_t *nodemask,
  55                unsigned long totalpages);
  56extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
  57                             unsigned int points, unsigned long totalpages,
  58                             struct mem_cgroup *memcg, nodemask_t *nodemask,
  59                             const char *message);
  60
  61extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  62extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  63
  64extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
  65                               int order, const nodemask_t *nodemask);
  66
  67extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
  68                unsigned long totalpages, const nodemask_t *nodemask,
  69                bool force_kill);
  70extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
  71                                     int order);
  72
  73extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
  74                int order, nodemask_t *mask, bool force_kill);
  75extern int register_oom_notifier(struct notifier_block *nb);
  76extern int unregister_oom_notifier(struct notifier_block *nb);
  77
  78extern bool oom_killer_disabled;
  79
  80static inline void oom_killer_disable(void)
  81{
  82        oom_killer_disabled = true;
  83}
  84
  85static inline void oom_killer_enable(void)
  86{
  87        oom_killer_disabled = false;
  88}
  89
  90extern struct task_struct *find_lock_task_mm(struct task_struct *p);
  91
  92/* sysctls */
  93extern int sysctl_oom_dump_tasks;
  94extern int sysctl_oom_kill_allocating_task;
  95extern int sysctl_panic_on_oom;
  96#endif /* __KERNEL__*/
  97#endif /* _INCLUDE_LINUX_OOM_H */
  98
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