1 #ifndef __INCLUDE_LINUX_OOM_H 2 #define __INCLUDE_LINUX_OOM_H 3 4 /* 5 * /proc/<pid>/oom_adj is deprecated, see 6 * Documentation/feature-removal-schedule.txt. 7 * 8 * /proc/<pid>/oom_adj set to -17 protects from the oom-killer 9 */ 10 #define OOM_DISABLE (-17) 11 /* inclusive */ 12 #define OOM_ADJUST_MIN (-16) 13 #define OOM_ADJUST_MAX 15 14 15 /* 16 * /proc/<pid>/oom_score_adj set to OOM_SCORE_ADJ_MIN disables oom killing for 17 * pid. 18 */ 19 #define OOM_SCORE_ADJ_MIN (-1000) 20 #define OOM_SCORE_ADJ_MAX 1000 21 22 #ifdef __KERNEL__ 23 24 #include <linux/sched.h> 25 #include <linux/types.h> 26 #include <linux/nodemask.h> 27 28 struct zonelist; 29 struct notifier_block; 30 struct mem_cgroup; 31 struct task_struct; 32 33 /* 34 * Types of limitations to the nodes from which allocations may occur 35 */ 36 enum oom_constraint { 37 CONSTRAINT_NONE, 38 CONSTRAINT_CPUSET, 39 CONSTRAINT_MEMORY_POLICY, 40 CONSTRAINT_MEMCG, 41 }; 42 43 enum oom_scan_t { 44 OOM_SCAN_OK, /* scan thread and find its badness */ 45 OOM_SCAN_CONTINUE, /* do not consider thread for oom kill */ 46 OOM_SCAN_ABORT, /* abort the iteration and return */ 47 OOM_SCAN_SELECT, /* always select this thread first */ 48 }; 49 50 extern void compare_swap_oom_score_adj(int old_val, int new_val); 51 extern int test_set_oom_score_adj(int new_val); 52 53 extern unsigned long oom_badness(struct task_struct *p, 54 struct mem_cgroup *memcg, const nodemask_t *nodemask, 55 unsigned long totalpages); 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 int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags); 62 extern void clear_zonelist_oom(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 extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask, 71 int order); 72 73 extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, 74 int order, nodemask_t *mask, bool force_kill); 75 extern int register_oom_notifier(struct notifier_block *nb); 76 extern int unregister_oom_notifier(struct notifier_block *nb); 77 78 extern bool oom_killer_disabled; 79 80 static inline void oom_killer_disable(void) 81 { 82 oom_killer_disabled = true; 83 } 84 85 static inline void oom_killer_enable(void) 86 { 87 oom_killer_disabled = false; 88 } 89 90 extern struct task_struct *find_lock_task_mm(struct task_struct *p); 91 92 /* sysctls */ 93 extern int sysctl_oom_dump_tasks; 94 extern int sysctl_oom_kill_allocating_task; 95 extern int sysctl_panic_on_oom; 96 #endif /* __KERNEL__*/ 97 #endif /* _INCLUDE_LINUX_OOM_H */ 98