include/linux/oom.h

   1 #ifndef __INCLUDE_LINUX_OOM_H
   2 #define __INCLUDE_LINUX_OOM_H
   3
   4 /* /proc/<pid>/oom_adj set to -17 protects from the oom-killer */
   5 #define OOM_DISABLE (-17)
   6 /* inclusive */
   7 #define OOM_ADJUST_MIN (-16)
   8 #define OOM_ADJUST_MAX 15
   9
  10 #ifdef __KERNEL__
  11
  12 #include <linux/types.h>
  13 #include <linux/nodemask.h>
  14
  15 struct zonelist;
  16 struct notifier_block;
  17
  18 /*
  19  * Types of limitations to the nodes from which allocations may occur
  20  */
  21 enum oom_constraint {
  22         CONSTRAINT_NONE,
  23         CONSTRAINT_CPUSET,
  24         CONSTRAINT_MEMORY_POLICY,
  25         CONSTRAINT_MEMCG,
  26 };
  27
  28 extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  29 extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  30
  31 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
  32                 int order, nodemask_t *mask);
  33 extern int register_oom_notifier(struct notifier_block *nb);
  34 extern int unregister_oom_notifier(struct notifier_block *nb);
  35
  36 extern bool oom_killer_disabled;
  37
  38 static inline void oom_killer_disable(void)
  39 {
  40         oom_killer_disabled = true;
  41 }
  42
  43 static inline void oom_killer_enable(void)
  44 {
  45         oom_killer_disabled = false;
  46 }
  47
  48 /* sysctls */
  49 extern int sysctl_oom_dump_tasks;
  50 extern int sysctl_oom_kill_allocating_task;
  51 extern int sysctl_panic_on_oom;
  52 #endif /* __KERNEL__*/
  53 #endif /* _INCLUDE_LINUX_OOM_H */