linux/include/linux/oom.h
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   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 * Types of limitations to the nodes from which allocations may occur
  17 */
  18enum oom_constraint {
  19        CONSTRAINT_NONE,
  20        CONSTRAINT_CPUSET,
  21        CONSTRAINT_MEMORY_POLICY,
  22        CONSTRAINT_MEMCG,
  23};
  24
  25enum 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/* Thread is the potential origin of an oom condition; kill first on oom */
  33#define OOM_FLAG_ORIGIN         ((__force oom_flags_t)0x1)
  34
  35static inline void set_current_oom_origin(void)
  36{
  37        current->signal->oom_flags |= OOM_FLAG_ORIGIN;
  38}
  39
  40static inline void clear_current_oom_origin(void)
  41{
  42        current->signal->oom_flags &= ~OOM_FLAG_ORIGIN;
  43}
  44
  45static inline bool oom_task_origin(const struct task_struct *p)
  46{
  47        return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN);
  48}
  49
  50extern unsigned long oom_badness(struct task_struct *p,
  51                struct mem_cgroup *memcg, const nodemask_t *nodemask,
  52                unsigned long totalpages);
  53extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
  54                             unsigned int points, unsigned long totalpages,
  55                             struct mem_cgroup *memcg, nodemask_t *nodemask,
  56                             const char *message);
  57
  58extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  59extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
  60
  61extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
  62                               int order, const nodemask_t *nodemask);
  63
  64extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
  65                unsigned long totalpages, const nodemask_t *nodemask,
  66                bool force_kill);
  67
  68extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
  69                int order, nodemask_t *mask, bool force_kill);
  70extern int register_oom_notifier(struct notifier_block *nb);
  71extern int unregister_oom_notifier(struct notifier_block *nb);
  72
  73extern bool oom_killer_disabled;
  74
  75static inline void oom_killer_disable(void)
  76{
  77        oom_killer_disabled = true;
  78}
  79
  80static inline void oom_killer_enable(void)
  81{
  82        oom_killer_disabled = false;
  83}
  84
  85extern struct task_struct *find_lock_task_mm(struct task_struct *p);
  86
  87/* sysctls */
  88extern int sysctl_oom_dump_tasks;
  89extern int sysctl_oom_kill_allocating_task;
  90extern int sysctl_panic_on_oom;
  91#endif /* _INCLUDE_LINUX_OOM_H */
  92
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