LXR linux/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
  10struct zonelist;
  11struct notifier_block;
  12struct mem_cgroup;
  13struct 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 */
  19struct 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
  39/*
  40 * Types of limitations to the nodes from which allocations may occur
  41 */
  42enum oom_constraint {
  43        CONSTRAINT_NONE,
  44        CONSTRAINT_CPUSET,
  45        CONSTRAINT_MEMORY_POLICY,
  46        CONSTRAINT_MEMCG,
  47};
  48
  49enum oom_scan_t {
  50        OOM_SCAN_OK,            /* scan thread and find its badness */
  51        OOM_SCAN_CONTINUE,      /* do not consider thread for oom kill */
  52        OOM_SCAN_ABORT,         /* abort the iteration and return */
  53        OOM_SCAN_SELECT,        /* always select this thread first */
  54};
  55
  56extern struct mutex oom_lock;
  57
  58static inline void set_current_oom_origin(void)
  59{
  60        current->signal->oom_flag_origin = true;
  61}
  62
  63static inline void clear_current_oom_origin(void)
  64{
  65        current->signal->oom_flag_origin = false;
  66}
  67
  68static inline bool oom_task_origin(const struct task_struct *p)
  69{
  70        return p->signal->oom_flag_origin;
  71}
  72
  73extern void mark_oom_victim(struct task_struct *tsk);
  74
  75#ifdef CONFIG_MMU
  76extern void wake_oom_reaper(struct task_struct *tsk);
  77#else
  78static inline void wake_oom_reaper(struct task_struct *tsk)
  79{
  80}
  81#endif
  82
  83extern unsigned long oom_badness(struct task_struct *p,
  84                struct mem_cgroup *memcg, const nodemask_t *nodemask,
  85                unsigned long totalpages);
  86
  87extern void oom_kill_process(struct oom_control *oc, struct task_struct *p,
  88                             unsigned int points, unsigned long totalpages,
  89                             const char *message);
  90
  91extern void check_panic_on_oom(struct oom_control *oc,
  92                               enum oom_constraint constraint);
  93
  94extern enum oom_scan_t oom_scan_process_thread(struct oom_control *oc,
  95                                               struct task_struct *task);
  96
  97extern bool out_of_memory(struct oom_control *oc);
  98
  99extern void exit_oom_victim(struct task_struct *tsk);
 100
 101extern int register_oom_notifier(struct notifier_block *nb);
 102extern int unregister_oom_notifier(struct notifier_block *nb);
 103
 104extern bool oom_killer_disabled;
 105extern bool oom_killer_disable(void);
 106extern void oom_killer_enable(void);
 107
 108extern struct task_struct *find_lock_task_mm(struct task_struct *p);
 109
 110bool task_will_free_mem(struct task_struct *task);
 111
 112/* sysctls */
 113extern int sysctl_oom_dump_tasks;
 114extern int sysctl_oom_kill_allocating_task;
 115extern int sysctl_panic_on_oom;
 116#endif /* _INCLUDE_LINUX_OOM_H */
 117