Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
8ac773b4 AD |
2 | #ifndef __INCLUDE_LINUX_OOM_H |
3 | #define __INCLUDE_LINUX_OOM_H | |
4 | ||
5a3135c2 | 5 | |
3f07c014 | 6 | #include <linux/sched/signal.h> |
172acf60 | 7 | #include <linux/types.h> |
4365a567 | 8 | #include <linux/nodemask.h> |
607ca46e | 9 | #include <uapi/linux/oom.h> |
6b31d595 MH |
10 | #include <linux/sched/coredump.h> /* MMF_* */ |
11 | #include <linux/mm.h> /* VM_FAULT* */ | |
172acf60 DR |
12 | |
13 | struct zonelist; | |
14 | struct notifier_block; | |
74bcbf40 AM |
15 | struct mem_cgroup; |
16 | struct task_struct; | |
172acf60 | 17 | |
ef8444ea | 18 | enum oom_constraint { |
19 | CONSTRAINT_NONE, | |
20 | CONSTRAINT_CPUSET, | |
21 | CONSTRAINT_MEMORY_POLICY, | |
22 | CONSTRAINT_MEMCG, | |
23 | }; | |
24 | ||
8989e4c7 DR |
25 | /* |
26 | * Details of the page allocation that triggered the oom killer that are used to | |
27 | * determine what should be killed. | |
28 | */ | |
6e0fc46d | 29 | struct oom_control { |
8989e4c7 | 30 | /* Used to determine cpuset */ |
6e0fc46d | 31 | struct zonelist *zonelist; |
8989e4c7 DR |
32 | |
33 | /* Used to determine mempolicy */ | |
34 | nodemask_t *nodemask; | |
35 | ||
2a966b77 VD |
36 | /* Memory cgroup in which oom is invoked, or NULL for global oom */ |
37 | struct mem_cgroup *memcg; | |
38 | ||
8989e4c7 DR |
39 | /* Used to determine cpuset and node locality requirement */ |
40 | const gfp_t gfp_mask; | |
41 | ||
42 | /* | |
43 | * order == -1 means the oom kill is required by sysrq, otherwise only | |
44 | * for display purposes. | |
45 | */ | |
46 | const int order; | |
6e0fc46d | 47 | |
7c5f64f8 VD |
48 | /* Used by oom implementation, do not set */ |
49 | unsigned long totalpages; | |
50 | struct task_struct *chosen; | |
9066e5cf | 51 | long chosen_points; |
ef8444ea | 52 | |
53 | /* Used to print the constraint info. */ | |
54 | enum oom_constraint constraint; | |
9cbb78bb DR |
55 | }; |
56 | ||
dc56401f | 57 | extern struct mutex oom_lock; |
67197a4f | 58 | extern struct mutex oom_adj_mutex; |
dc56401f | 59 | |
e1e12d2f DR |
60 | static inline void set_current_oom_origin(void) |
61 | { | |
c96fc2d8 | 62 | current->signal->oom_flag_origin = true; |
e1e12d2f DR |
63 | } |
64 | ||
65 | static inline void clear_current_oom_origin(void) | |
66 | { | |
c96fc2d8 | 67 | current->signal->oom_flag_origin = false; |
e1e12d2f DR |
68 | } |
69 | ||
70 | static inline bool oom_task_origin(const struct task_struct *p) | |
71 | { | |
c96fc2d8 | 72 | return p->signal->oom_flag_origin; |
e1e12d2f | 73 | } |
72788c38 | 74 | |
862e3073 MH |
75 | static inline bool tsk_is_oom_victim(struct task_struct * tsk) |
76 | { | |
77 | return tsk->signal->oom_mm; | |
78 | } | |
79 | ||
4837fe37 MH |
80 | /* |
81 | * Use this helper if tsk->mm != mm and the victim mm needs a special | |
82 | * handling. This is guaranteed to stay true after once set. | |
83 | */ | |
84 | static inline bool mm_is_oom_victim(struct mm_struct *mm) | |
85 | { | |
86 | return test_bit(MMF_OOM_VICTIM, &mm->flags); | |
87 | } | |
88 | ||
6b31d595 MH |
89 | /* |
90 | * Checks whether a page fault on the given mm is still reliable. | |
91 | * This is no longer true if the oom reaper started to reap the | |
92 | * address space which is reflected by MMF_UNSTABLE flag set in | |
93 | * the mm. At that moment any !shared mapping would lose the content | |
94 | * and could cause a memory corruption (zero pages instead of the | |
95 | * original content). | |
96 | * | |
97 | * User should call this before establishing a page table entry for | |
98 | * a !shared mapping and under the proper page table lock. | |
99 | * | |
100 | * Return 0 when the PF is safe VM_FAULT_SIGBUS otherwise. | |
101 | */ | |
2b740303 | 102 | static inline vm_fault_t check_stable_address_space(struct mm_struct *mm) |
6b31d595 MH |
103 | { |
104 | if (unlikely(test_bit(MMF_UNSTABLE, &mm->flags))) | |
105 | return VM_FAULT_SIGBUS; | |
106 | return 0; | |
107 | } | |
108 | ||
93065ac7 | 109 | bool __oom_reap_task_mm(struct mm_struct *mm); |
27ae357f | 110 | |
9066e5cf | 111 | long oom_badness(struct task_struct *p, |
a7f638f9 | 112 | unsigned long totalpages); |
5695be14 | 113 | |
6e0fc46d | 114 | extern bool out_of_memory(struct oom_control *oc); |
16e95196 | 115 | |
38531201 | 116 | extern void exit_oom_victim(void); |
16e95196 | 117 | |
5a3135c2 DR |
118 | extern int register_oom_notifier(struct notifier_block *nb); |
119 | extern int unregister_oom_notifier(struct notifier_block *nb); | |
120 | ||
7d2e7a22 | 121 | extern bool oom_killer_disable(signed long timeout); |
c32b3cbe | 122 | extern void oom_killer_enable(void); |
8e4228e1 | 123 | |
158e0a2d KH |
124 | extern struct task_struct *find_lock_task_mm(struct task_struct *p); |
125 | ||
8e4228e1 DR |
126 | /* sysctls */ |
127 | extern int sysctl_oom_dump_tasks; | |
128 | extern int sysctl_oom_kill_allocating_task; | |
129 | extern int sysctl_panic_on_oom; | |
5a3135c2 | 130 | #endif /* _INCLUDE_LINUX_OOM_H */ |