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 10struct zonelist; 11struct notifier_block; 12struct mem_cgroup; 13struct task_struct; 14 15/* 16 * Types of limitations to the nodes from which allocations may occur 17 */ 18enum oom_constraint { 19 CONSTRAINT_NONE, 20 CONSTRAINT_CPUSET, 21 CONSTRAINT_MEMORY_POLICY, 22 CONSTRAINT_MEMCG, 23}; 24 25enum oom_scan_t { 26 OOM_SCAN_OK, /* scan thread and find its badness */ 27 OOM_SCAN_CONTINUE, /* do not consider thread for oom kill */ 28 OOM_SCAN_ABORT, /* abort the iteration and return */ 29 OOM_SCAN_SELECT, /* always select this thread first */ 30}; 31 32/* Thread is the potential origin of an oom condition; kill first on oom */ 33#define OOM_FLAG_ORIGIN ((__force oom_flags_t)0x1) 34 35static inline void set_current_oom_origin(void) 36{ 37 current->signal->oom_flags |= OOM_FLAG_ORIGIN; 38} 39 40static inline void clear_current_oom_origin(void) 41{ 42 current->signal->oom_flags &= ~OOM_FLAG_ORIGIN; 43} 44 45static inline bool oom_task_origin(const struct task_struct *p) 46{ 47 return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN); 48} 49 50extern void mark_tsk_oom_victim(struct task_struct *tsk); 51 52extern void unmark_oom_victim(void); 53 54extern unsigned long oom_badness(struct task_struct *p, 55 struct mem_cgroup *memcg, const nodemask_t *nodemask, 56 unsigned long totalpages); 57 58extern int oom_kills_count(void); 59extern void note_oom_kill(void); 60extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, 61 unsigned int points, unsigned long totalpages, 62 struct mem_cgroup *memcg, nodemask_t *nodemask, 63 const char *message); 64 65extern bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_flags); 66extern void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_flags); 67 68extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask, 69 int order, const nodemask_t *nodemask, 70 struct mem_cgroup *memcg); 71 72extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task, 73 unsigned long totalpages, const nodemask_t *nodemask, 74 bool force_kill); 75 76extern bool out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, 77 int order, nodemask_t *mask, bool force_kill); 78extern int register_oom_notifier(struct notifier_block *nb); 79extern int unregister_oom_notifier(struct notifier_block *nb); 80 81extern bool oom_killer_disabled; 82extern bool oom_killer_disable(void); 83extern void oom_killer_enable(void); 84 85extern struct task_struct *find_lock_task_mm(struct task_struct *p); 86 87static inline bool task_will_free_mem(struct task_struct *task) 88{ 89 /* 90 * A coredumping process may sleep for an extended period in exit_mm(), 91 * so the oom killer cannot assume that the process will promptly exit 92 * and release memory. 93 */ 94 return (task->flags & PF_EXITING) && 95 !(task->signal->flags & SIGNAL_GROUP_COREDUMP); 96} 97 98/* sysctls */ 99extern int sysctl_oom_dump_tasks; 100extern int sysctl_oom_kill_allocating_task; 101extern int sysctl_panic_on_oom; 102#endif /* _INCLUDE_LINUX_OOM_H */ 103