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