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 * Types of limitations to the nodes from which allocations may occur 17 */ 18 enum oom_constraint { 19 CONSTRAINT_NONE, 20 CONSTRAINT_CPUSET, 21 CONSTRAINT_MEMORY_POLICY, 22 CONSTRAINT_MEMCG, 23 }; 24 25 enum 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 35 static inline void set_current_oom_origin(void) 36 { 37 current->signal->oom_flags |= OOM_FLAG_ORIGIN; 38 } 39 40 static inline void clear_current_oom_origin(void) 41 { 42 current->signal->oom_flags &= ~OOM_FLAG_ORIGIN; 43 } 44 45 static inline bool oom_task_origin(const struct task_struct *p) 46 { 47 return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN); 48 } 49 50 extern unsigned long oom_badness(struct task_struct *p, 51 struct mem_cgroup *memcg, const nodemask_t *nodemask, 52 unsigned long totalpages); 53 54 extern int oom_kills_count(void); 55 extern void note_oom_kill(void); 56 extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, 57 unsigned int points, unsigned long totalpages, 58 struct mem_cgroup *memcg, nodemask_t *nodemask, 59 const char *message); 60 61 extern bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_flags); 62 extern void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_flags); 63 64 extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask, 65 int order, const nodemask_t *nodemask); 66 67 extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task, 68 unsigned long totalpages, const nodemask_t *nodemask, 69 bool force_kill); 70 71 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, 72 int order, nodemask_t *mask, bool force_kill); 73 extern int register_oom_notifier(struct notifier_block *nb); 74 extern int unregister_oom_notifier(struct notifier_block *nb); 75 76 extern bool oom_killer_disabled; 77 78 static inline void oom_killer_disable(void) 79 { 80 oom_killer_disabled = true; 81 } 82 83 static inline void oom_killer_enable(void) 84 { 85 oom_killer_disabled = false; 86 } 87 88 extern struct task_struct *find_lock_task_mm(struct task_struct *p); 89 90 static inline bool task_will_free_mem(struct task_struct *task) 91 { 92 /* 93 * A coredumping process may sleep for an extended period in exit_mm(), 94 * so the oom killer cannot assume that the process will promptly exit 95 * and release memory. 96 */ 97 return (task->flags & PF_EXITING) && 98 !(task->signal->flags & SIGNAL_GROUP_COREDUMP); 99 } 100 101 /* sysctls */ 102 extern int sysctl_oom_dump_tasks; 103 extern int sysctl_oom_kill_allocating_task; 104 extern int sysctl_panic_on_oom; 105 #endif /* _INCLUDE_LINUX_OOM_H */ 106