include/linux/oom.h

   1 #ifndef __INCLUDE_LINUX_OOM_H
   2 #define __INCLUDE_LINUX_OOM_H
   3
   4
   5 #include <linux/sched/signal.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  * Details of the page allocation that triggered the oom killer that are used to
  17  * determine what should be killed.
  18  */
  19 struct oom_control {
  20         /* Used to determine cpuset */
  21         struct zonelist *zonelist;
  22
  23         /* Used to determine mempolicy */
  24         nodemask_t *nodemask;
  25
  26         /* Memory cgroup in which oom is invoked, or NULL for global oom */
  27         struct mem_cgroup *memcg;
  28
  29         /* Used to determine cpuset and node locality requirement */
  30         const gfp_t gfp_mask;
  31
  32         /*
  33          * order == -1 means the oom kill is required by sysrq, otherwise only
  34          * for display purposes.
  35          */
  36         const int order;
  37
  38         /* Used by oom implementation, do not set */
  39         unsigned long totalpages;
  40         struct task_struct *chosen;
  41         unsigned long chosen_points;
  42 };
  43
  44 extern struct mutex oom_lock;
  45
  46 static inline void set_current_oom_origin(void)
  47 {
  48         current->signal->oom_flag_origin = true;
  49 }
  50
  51 static inline void clear_current_oom_origin(void)
  52 {
  53         current->signal->oom_flag_origin = false;
  54 }
  55
  56 static inline bool oom_task_origin(const struct task_struct *p)
  57 {
  58         return p->signal->oom_flag_origin;
  59 }
  60
  61 static inline bool tsk_is_oom_victim(struct task_struct * tsk)
  62 {
  63         return tsk->signal->oom_mm;
  64 }
  65
  66 extern unsigned long oom_badness(struct task_struct *p,
  67                 struct mem_cgroup *memcg, const nodemask_t *nodemask,
  68                 unsigned long totalpages);
  69
  70 extern bool out_of_memory(struct oom_control *oc);
  71
  72 extern void exit_oom_victim(void);
  73
  74 extern int register_oom_notifier(struct notifier_block *nb);
  75 extern int unregister_oom_notifier(struct notifier_block *nb);
  76
  77 extern bool oom_killer_disable(signed long timeout);
  78 extern void oom_killer_enable(void);
  79
  80 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
  81
  82 /* sysctls */
  83 extern int sysctl_oom_dump_tasks;
  84 extern int sysctl_oom_kill_allocating_task;
  85 extern int sysctl_panic_on_oom;
  86 #endif /* _INCLUDE_LINUX_OOM_H */