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 10 struct zonelist; 11 struct notifier_block; 12 struct mem_cgroup; 13 struct 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 */ 19 struct 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 */ 42 enum oom_constraint { 43 CONSTRAINT_NONE, 44 CONSTRAINT_CPUSET, 45 CONSTRAINT_MEMORY_POLICY, 46 CONSTRAINT_MEMCG, 47 }; 48 49 enum 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 56 extern struct mutex oom_lock; 57 58 static inline void set_current_oom_origin(void) 59 { 60 current->signal->oom_flag_origin = true; 61 } 62 63 static inline void clear_current_oom_origin(void) 64 { 65 current->signal->oom_flag_origin = false; 66 } 67 68 static inline bool oom_task_origin(const struct task_struct *p) 69 { 70 return p->signal->oom_flag_origin; 71 } 72 73 extern void mark_oom_victim(struct task_struct *tsk); 74 75 #ifdef CONFIG_MMU 76 extern void wake_oom_reaper(struct task_struct *tsk); 77 #else 78 static inline void wake_oom_reaper(struct task_struct *tsk) 79 { 80 } 81 #endif 82 83 extern unsigned long oom_badness(struct task_struct *p, 84 struct mem_cgroup *memcg, const nodemask_t *nodemask, 85 unsigned long totalpages); 86 87 extern void oom_kill_process(struct oom_control *oc, struct task_struct *p, 88 unsigned int points, unsigned long totalpages, 89 const char *message); 90 91 extern void check_panic_on_oom(struct oom_control *oc, 92 enum oom_constraint constraint); 93 94 extern enum oom_scan_t oom_scan_process_thread(struct oom_control *oc, 95 struct task_struct *task); 96 97 extern bool out_of_memory(struct oom_control *oc); 98 99 extern void exit_oom_victim(struct task_struct *tsk); 100 101 extern int register_oom_notifier(struct notifier_block *nb); 102 extern int unregister_oom_notifier(struct notifier_block *nb); 103 104 extern bool oom_killer_disabled; 105 extern bool oom_killer_disable(void); 106 extern void oom_killer_enable(void); 107 108 extern struct task_struct *find_lock_task_mm(struct task_struct *p); 109 110 bool task_will_free_mem(struct task_struct *task); 111 112 /* sysctls */ 113 extern int sysctl_oom_dump_tasks; 114 extern int sysctl_oom_kill_allocating_task; 115 extern int sysctl_panic_on_oom; 116 #endif /* _INCLUDE_LINUX_OOM_H */ 117