include/linux/oom.h

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