1 #ifndef __INCLUDE_LINUX_OOM_H
2 #define __INCLUDE_LINUX_OOM_H
5 #include <linux/sched/signal.h>
6 #include <linux/types.h>
7 #include <linux/nodemask.h>
8 #include <uapi/linux/oom.h>
9 #include <linux/sched/coredump.h> /* MMF_* */
10 #include <linux/mm.h> /* VM_FAULT* */
13 struct notifier_block;
18 * Details of the page allocation that triggered the oom killer that are used to
19 * determine what should be killed.
22 /* Used to determine cpuset */
23 struct zonelist *zonelist;
25 /* Used to determine mempolicy */
28 /* Memory cgroup in which oom is invoked, or NULL for global oom */
29 struct mem_cgroup *memcg;
31 /* Used to determine cpuset and node locality requirement */
35 * order == -1 means the oom kill is required by sysrq, otherwise only
36 * for display purposes.
40 /* Used by oom implementation, do not set */
41 unsigned long totalpages;
42 struct task_struct *chosen;
43 unsigned long chosen_points;
46 extern struct mutex oom_lock;
48 static inline void set_current_oom_origin(void)
50 current->signal->oom_flag_origin = true;
53 static inline void clear_current_oom_origin(void)
55 current->signal->oom_flag_origin = false;
58 static inline bool oom_task_origin(const struct task_struct *p)
60 return p->signal->oom_flag_origin;
63 static inline bool tsk_is_oom_victim(struct task_struct * tsk)
65 return tsk->signal->oom_mm;
69 * Checks whether a page fault on the given mm is still reliable.
70 * This is no longer true if the oom reaper started to reap the
71 * address space which is reflected by MMF_UNSTABLE flag set in
72 * the mm. At that moment any !shared mapping would lose the content
73 * and could cause a memory corruption (zero pages instead of the
76 * User should call this before establishing a page table entry for
77 * a !shared mapping and under the proper page table lock.
79 * Return 0 when the PF is safe VM_FAULT_SIGBUS otherwise.
81 static inline int check_stable_address_space(struct mm_struct *mm)
83 if (unlikely(test_bit(MMF_UNSTABLE, &mm->flags)))
84 return VM_FAULT_SIGBUS;
88 extern unsigned long oom_badness(struct task_struct *p,
89 struct mem_cgroup *memcg, const nodemask_t *nodemask,
90 unsigned long totalpages);
92 extern bool out_of_memory(struct oom_control *oc);
94 extern void exit_oom_victim(void);
96 extern int register_oom_notifier(struct notifier_block *nb);
97 extern int unregister_oom_notifier(struct notifier_block *nb);
99 extern bool oom_killer_disable(signed long timeout);
100 extern void oom_killer_enable(void);
102 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
105 extern int sysctl_oom_dump_tasks;
106 extern int sysctl_oom_kill_allocating_task;
107 extern int sysctl_panic_on_oom;
108 #endif /* _INCLUDE_LINUX_OOM_H */