include/linux/oom.h

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