LXR linux/include/linux/oom.h

   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
  43extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
  44                        const nodemask_t *nodemask, unsigned long totalpages);
  45extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  46extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  47
  48extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
  49                int order, nodemask_t *mask);
  50extern int register_oom_notifier(struct notifier_block *nb);
  51extern int unregister_oom_notifier(struct notifier_block *nb);
  52
  53extern bool oom_killer_disabled;
  54
  55static inline void oom_killer_disable(void)
  56{
  57        oom_killer_disabled = true;
  58}
  59
  60static inline void oom_killer_enable(void)
  61{
  62        oom_killer_disabled = false;
  63}
  64
  65/* The badness from the OOM killer */
  66extern unsigned long badness(struct task_struct *p, struct mem_cgroup *mem,
  67                      const nodemask_t *nodemask, unsigned long uptime);
  68
  69extern struct task_struct *find_lock_task_mm(struct task_struct *p);
  70
  71/* sysctls */
  72extern int sysctl_oom_dump_tasks;
  73extern int sysctl_oom_kill_allocating_task;
  74extern int sysctl_panic_on_oom;
  75#endif /* __KERNEL__*/
  76#endif /* _INCLUDE_LINUX_OOM_H */
  77