#ifndef __INCLUDE_LINUX_OOM_H #define __INCLUDE_LINUX_OOM_H #include <linux/sched.h> #include <linux/types.h> #include <linux/nodemask.h> #include <uapi/linux/oom.h> struct zonelist; struct notifier_block; struct mem_cgroup; struct task_struct; /* * Details of the page allocation that triggered the oom killer that are used to * determine what should be killed. */ struct oom_control { /* Used to determine cpuset */ struct zonelist *zonelist; /* Used to determine mempolicy */ nodemask_t *nodemask; /* Used to determine cpuset and node locality requirement */ const gfp_t gfp_mask; /* * order == -1 means the oom kill is required by sysrq, otherwise only * for display purposes. */ const int order; }; /* * Types of limitations to the nodes from which allocations may occur */ enum oom_constraint { CONSTRAINT_NONE, CONSTRAINT_CPUSET, CONSTRAINT_MEMORY_POLICY, CONSTRAINT_MEMCG, }; enum oom_scan_t { OOM_SCAN_OK, /* scan thread and find its badness */ OOM_SCAN_CONTINUE, /* do not consider thread for oom kill */ OOM_SCAN_ABORT, /* abort the iteration and return */ OOM_SCAN_SELECT, /* always select this thread first */ }; /* Thread is the potential origin of an oom condition; kill first on oom */ #define OOM_FLAG_ORIGIN ((__force oom_flags_t)0x1) extern struct mutex oom_lock; static inline void set_current_oom_origin(void) { current->signal->oom_flags |= OOM_FLAG_ORIGIN; } static inline void clear_current_oom_origin(void) { current->signal->oom_flags &= ~OOM_FLAG_ORIGIN; } static inline bool oom_task_origin(const struct task_struct *p) { return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN); } extern void mark_oom_victim(struct task_struct *tsk); extern unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg, const nodemask_t *nodemask, unsigned long totalpages); extern int oom_kills_count(void); extern void note_oom_kill(void); extern void oom_kill_process(struct oom_control *oc, struct task_struct *p, unsigned int points, unsigned long totalpages, struct mem_cgroup *memcg, const char *message); extern void check_panic_on_oom(struct oom_control *oc, enum oom_constraint constraint, struct mem_cgroup *memcg); extern enum oom_scan_t oom_scan_process_thread(struct oom_control *oc, struct task_struct *task, unsigned long totalpages); extern bool out_of_memory(struct oom_control *oc); extern void exit_oom_victim(void); extern int register_oom_notifier(struct notifier_block *nb); extern int unregister_oom_notifier(struct notifier_block *nb); extern bool oom_killer_disabled; extern bool oom_killer_disable(void); extern void oom_killer_enable(void); extern struct task_struct *find_lock_task_mm(struct task_struct *p); static inline bool task_will_free_mem(struct task_struct *task) { /* * A coredumping process may sleep for an extended period in exit_mm(), * so the oom killer cannot assume that the process will promptly exit * and release memory. */ return (task->flags & PF_EXITING) && !(task->signal->flags & SIGNAL_GROUP_COREDUMP); } /* sysctls */ extern int sysctl_oom_dump_tasks; extern int sysctl_oom_kill_allocating_task; extern int sysctl_panic_on_oom; #endif /* _INCLUDE_LINUX_OOM_H */