1 #ifndef __INCLUDE_LINUX_OOM_H 2 #define __INCLUDE_LINUX_OOM_H 3 4 /* 5 * /proc/<pid>/oom_score_adj set to OOM_SCORE_ADJ_MIN disables oom killing for 6 * pid. 7 */ 8 #define OOM_SCORE_ADJ_MIN (-1000) 9 #define OOM_SCORE_ADJ_MAX 1000 10 11 #ifdef __KERNEL__ 12 13 #include <linux/sched.h> 14 #include <linux/types.h> 15 #include <linux/nodemask.h> 16 17 struct zonelist; 18 struct notifier_block; 19 struct mem_cgroup; 20 struct task_struct; 21 22 /* 23 * Types of limitations to the nodes from which allocations may occur 24 */ 25 enum oom_constraint { 26 CONSTRAINT_NONE, 27 CONSTRAINT_CPUSET, 28 CONSTRAINT_MEMORY_POLICY, 29 CONSTRAINT_MEMCG, 30 }; 31 32 enum oom_scan_t { 33 OOM_SCAN_OK, /* scan thread and find its badness */ 34 OOM_SCAN_CONTINUE, /* do not consider thread for oom kill */ 35 OOM_SCAN_ABORT, /* abort the iteration and return */ 36 OOM_SCAN_SELECT, /* always select this thread first */ 37 }; 38 39 extern void compare_swap_oom_score_adj(int old_val, int new_val); 40 extern int test_set_oom_score_adj(int new_val); 41 42 extern unsigned long oom_badness(struct task_struct *p, 43 struct mem_cgroup *memcg, const nodemask_t *nodemask, 44 unsigned long totalpages); 45 extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, 46 unsigned int points, unsigned long totalpages, 47 struct mem_cgroup *memcg, nodemask_t *nodemask, 48 const char *message); 49 50 extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags); 51 extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags); 52 53 extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask, 54 int order, const nodemask_t *nodemask); 55 56 extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task, 57 unsigned long totalpages, const nodemask_t *nodemask, 58 bool force_kill); 59 extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask, 60 int order); 61 62 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, 63 int order, nodemask_t *mask, bool force_kill); 64 extern int register_oom_notifier(struct notifier_block *nb); 65 extern int unregister_oom_notifier(struct notifier_block *nb); 66 67 extern bool oom_killer_disabled; 68 69 static inline void oom_killer_disable(void) 70 { 71 oom_killer_disabled = true; 72 } 73 74 static inline void oom_killer_enable(void) 75 { 76 oom_killer_disabled = false; 77 } 78 79 extern struct task_struct *find_lock_task_mm(struct task_struct *p); 80 81 /* sysctls */ 82 extern int sysctl_oom_dump_tasks; 83 extern int sysctl_oom_kill_allocating_task; 84 extern int sysctl_panic_on_oom; 85 #endif /* __KERNEL__*/ 86 #endif /* _INCLUDE_LINUX_OOM_H */ 87