1 #ifndef __INCLUDE_LINUX_OOM_H 2 #define __INCLUDE_LINUX_OOM_H 3 4 5 #include <linux/sched/signal.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 /* Used by oom implementation, do not set */ 39 unsigned long totalpages; 40 struct task_struct *chosen; 41 unsigned long chosen_points; 42 }; 43 44 extern struct mutex oom_lock; 45 46 static inline void set_current_oom_origin(void) 47 { 48 current->signal->oom_flag_origin = true; 49 } 50 51 static inline void clear_current_oom_origin(void) 52 { 53 current->signal->oom_flag_origin = false; 54 } 55 56 static inline bool oom_task_origin(const struct task_struct *p) 57 { 58 return p->signal->oom_flag_origin; 59 } 60 61 static inline bool tsk_is_oom_victim(struct task_struct * tsk) 62 { 63 return tsk->signal->oom_mm; 64 } 65 66 extern unsigned long oom_badness(struct task_struct *p, 67 struct mem_cgroup *memcg, const nodemask_t *nodemask, 68 unsigned long totalpages); 69 70 extern bool out_of_memory(struct oom_control *oc); 71 72 extern void exit_oom_victim(void); 73 74 extern int register_oom_notifier(struct notifier_block *nb); 75 extern int unregister_oom_notifier(struct notifier_block *nb); 76 77 extern bool oom_killer_disable(signed long timeout); 78 extern void oom_killer_enable(void); 79 80 extern struct task_struct *find_lock_task_mm(struct task_struct *p); 81 82 /* sysctls */ 83 extern int sysctl_oom_dump_tasks; 84 extern int sysctl_oom_kill_allocating_task; 85 extern int sysctl_panic_on_oom; 86 #endif /* _INCLUDE_LINUX_OOM_H */ 87