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
  28 struct zonelist;
  29 struct notifier_block;
  30 struct mem_cgroup;
  31 struct task_struct;
  32
  33 /*
  34  * Types of limitations to the nodes from which allocations may occur
  35  */
  36 enum oom_constraint {
  37         CONSTRAINT_NONE,
  38         CONSTRAINT_CPUSET,
  39         CONSTRAINT_MEMORY_POLICY,
  40         CONSTRAINT_MEMCG,
  41 };
  42
  43 extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
  44                         const nodemask_t *nodemask, unsigned long totalpages);
  45 extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  46 extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  47
  48 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
  49                 int order, nodemask_t *mask);
  50 extern int register_oom_notifier(struct notifier_block *nb);
  51 extern int unregister_oom_notifier(struct notifier_block *nb);
  52
  53 extern bool oom_killer_disabled;
  54
  55 static inline void oom_killer_disable(void)
  56 {
  57         oom_killer_disabled = true;
  58 }
  59
  60 static inline void oom_killer_enable(void)
  61 {
  62         oom_killer_disabled = false;
  63 }
  64
  65 /* The badness from the OOM killer */
  66 extern unsigned long badness(struct task_struct *p, struct mem_cgroup *mem,
  67                       const nodemask_t *nodemask, unsigned long uptime);
  68
  69 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
  70
  71 /* sysctls */
  72 extern int sysctl_oom_dump_tasks;
  73 extern int sysctl_oom_kill_allocating_task;
  74 extern int sysctl_panic_on_oom;
  75 #endif /* __KERNEL__*/
  76 #endif /* _INCLUDE_LINUX_OOM_H */