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 enum 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
  50 extern void compare_swap_oom_score_adj(int old_val, int new_val);
  51 extern int test_set_oom_score_adj(int new_val);
  52
  53 extern unsigned long oom_badness(struct task_struct *p,
  54                 struct mem_cgroup *memcg, const nodemask_t *nodemask,
  55                 unsigned long totalpages);
  56 extern 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
  61 extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  62 extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  63
  64 extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
  65                                int order, const nodemask_t *nodemask);
  66
  67 extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
  68                 unsigned long totalpages, const nodemask_t *nodemask,
  69                 bool force_kill);
  70 extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
  71                                      int order);
  72
  73 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
  74                 int order, nodemask_t *mask, bool force_kill);
  75 extern int register_oom_notifier(struct notifier_block *nb);
  76 extern int unregister_oom_notifier(struct notifier_block *nb);
  77
  78 extern bool oom_killer_disabled;
  79
  80 static inline void oom_killer_disable(void)
  81 {
  82         oom_killer_disabled = true;
  83 }
  84
  85 static inline void oom_killer_enable(void)
  86 {
  87         oom_killer_disabled = false;
  88 }
  89
  90 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
  91
  92 /* sysctls */
  93 extern int sysctl_oom_dump_tasks;
  94 extern int sysctl_oom_kill_allocating_task;
  95 extern int sysctl_panic_on_oom;
  96 #endif /* __KERNEL__*/
  97 #endif /* _INCLUDE_LINUX_OOM_H */