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8ac773b4 AD |
1 | #ifndef __INCLUDE_LINUX_OOM_H |
2 | #define __INCLUDE_LINUX_OOM_H | |
3 | ||
5a3135c2 | 4 | |
3f07c014 | 5 | #include <linux/sched/signal.h> |
172acf60 | 6 | #include <linux/types.h> |
4365a567 | 7 | #include <linux/nodemask.h> |
607ca46e | 8 | #include <uapi/linux/oom.h> |
6b31d595 MH |
9 | #include <linux/sched/coredump.h> /* MMF_* */ |
10 | #include <linux/mm.h> /* VM_FAULT* */ | |
172acf60 DR |
11 | |
12 | struct zonelist; | |
13 | struct notifier_block; | |
74bcbf40 AM |
14 | struct mem_cgroup; |
15 | struct task_struct; | |
172acf60 | 16 | |
8989e4c7 DR |
17 | /* |
18 | * Details of the page allocation that triggered the oom killer that are used to | |
19 | * determine what should be killed. | |
20 | */ | |
6e0fc46d | 21 | struct oom_control { |
8989e4c7 | 22 | /* Used to determine cpuset */ |
6e0fc46d | 23 | struct zonelist *zonelist; |
8989e4c7 DR |
24 | |
25 | /* Used to determine mempolicy */ | |
26 | nodemask_t *nodemask; | |
27 | ||
2a966b77 VD |
28 | /* Memory cgroup in which oom is invoked, or NULL for global oom */ |
29 | struct mem_cgroup *memcg; | |
30 | ||
8989e4c7 DR |
31 | /* Used to determine cpuset and node locality requirement */ |
32 | const gfp_t gfp_mask; | |
33 | ||
34 | /* | |
35 | * order == -1 means the oom kill is required by sysrq, otherwise only | |
36 | * for display purposes. | |
37 | */ | |
38 | const int order; | |
6e0fc46d | 39 | |
7c5f64f8 VD |
40 | /* Used by oom implementation, do not set */ |
41 | unsigned long totalpages; | |
42 | struct task_struct *chosen; | |
43 | unsigned long chosen_points; | |
9cbb78bb DR |
44 | }; |
45 | ||
dc56401f JW |
46 | extern struct mutex oom_lock; |
47 | ||
e1e12d2f DR |
48 | static inline void set_current_oom_origin(void) |
49 | { | |
c96fc2d8 | 50 | current->signal->oom_flag_origin = true; |
e1e12d2f DR |
51 | } |
52 | ||
53 | static inline void clear_current_oom_origin(void) | |
54 | { | |
c96fc2d8 | 55 | current->signal->oom_flag_origin = false; |
e1e12d2f DR |
56 | } |
57 | ||
58 | static inline bool oom_task_origin(const struct task_struct *p) | |
59 | { | |
c96fc2d8 | 60 | return p->signal->oom_flag_origin; |
e1e12d2f | 61 | } |
72788c38 | 62 | |
862e3073 MH |
63 | static inline bool tsk_is_oom_victim(struct task_struct * tsk) |
64 | { | |
65 | return tsk->signal->oom_mm; | |
66 | } | |
67 | ||
6b31d595 MH |
68 | /* |
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 | |
74 | * original content). | |
75 | * | |
76 | * User should call this before establishing a page table entry for | |
77 | * a !shared mapping and under the proper page table lock. | |
78 | * | |
79 | * Return 0 when the PF is safe VM_FAULT_SIGBUS otherwise. | |
80 | */ | |
81 | static inline int check_stable_address_space(struct mm_struct *mm) | |
82 | { | |
83 | if (unlikely(test_bit(MMF_UNSTABLE, &mm->flags))) | |
84 | return VM_FAULT_SIGBUS; | |
85 | return 0; | |
86 | } | |
87 | ||
a7f638f9 DR |
88 | extern unsigned long oom_badness(struct task_struct *p, |
89 | struct mem_cgroup *memcg, const nodemask_t *nodemask, | |
90 | unsigned long totalpages); | |
5695be14 | 91 | |
6e0fc46d | 92 | extern bool out_of_memory(struct oom_control *oc); |
16e95196 | 93 | |
38531201 | 94 | extern void exit_oom_victim(void); |
16e95196 | 95 | |
5a3135c2 DR |
96 | extern int register_oom_notifier(struct notifier_block *nb); |
97 | extern int unregister_oom_notifier(struct notifier_block *nb); | |
98 | ||
7d2e7a22 | 99 | extern bool oom_killer_disable(signed long timeout); |
c32b3cbe | 100 | extern void oom_killer_enable(void); |
8e4228e1 | 101 | |
158e0a2d KH |
102 | extern struct task_struct *find_lock_task_mm(struct task_struct *p); |
103 | ||
8e4228e1 DR |
104 | /* sysctls */ |
105 | extern int sysctl_oom_dump_tasks; | |
106 | extern int sysctl_oom_kill_allocating_task; | |
107 | extern int sysctl_panic_on_oom; | |
5a3135c2 | 108 | #endif /* _INCLUDE_LINUX_OOM_H */ |