Release 4.14 include/linux/oom.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __INCLUDE_LINUX_OOM_H

#define __INCLUDE_LINUX_OOM_H


#include <linux/sched/signal.h>
#include <linux/types.h>
#include <linux/nodemask.h>
#include <uapi/linux/oom.h>
#include <linux/sched/coredump.h> /* MMF_* */
#include <linux/mm.h> /* VM_FAULT* */

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;

	/* Memory cgroup in which oom is invoked, or NULL for global oom */
	
struct mem_cgroup *memcg;

	/* 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;

	/* Used by oom implementation, do not set */
	
unsigned long totalpages;
	
struct task_struct *chosen;
	
unsigned long chosen_points;
};

extern struct mutex oom_lock;



static inline void set_current_oom_origin(void)
{
	current->signal->oom_flag_origin = true;
}

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static inline void clear_current_oom_origin(void)
{
	current->signal->oom_flag_origin = false;
}

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static inline bool oom_task_origin(const struct task_struct *p)
{
	return p->signal->oom_flag_origin;
}

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static inline bool tsk_is_oom_victim(struct task_struct * tsk)
{
	return tsk->signal->oom_mm;
}

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/*
 * Checks whether a page fault on the given mm is still reliable.
 * This is no longer true if the oom reaper started to reap the
 * address space which is reflected by MMF_UNSTABLE flag set in
 * the mm. At that moment any !shared mapping would lose the content
 * and could cause a memory corruption (zero pages instead of the
 * original content).
 *
 * User should call this before establishing a page table entry for
 * a !shared mapping and under the proper page table lock.
 *
 * Return 0 when the PF is safe VM_FAULT_SIGBUS otherwise.
 */


static inline int check_stable_address_space(struct mm_struct *mm)
{
	if (unlikely(test_bit(MMF_UNSTABLE, &mm->flags)))
		return VM_FAULT_SIGBUS;
	return 0;
}

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extern unsigned long oom_badness(struct task_struct *p,
		struct mem_cgroup *memcg, const nodemask_t *nodemask,
		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_disable(signed long timeout);
extern void oom_killer_enable(void);

extern struct task_struct *find_lock_task_mm(struct task_struct *p);

/* 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 */
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Kamezawa Hiroyuki
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Alexey Dobriyan
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Johannes Weiner
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Tetsuo Handa
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Andrew Morton
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David Howells
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Ingo Molnar
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Directory: include/linux

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