[mirror_ubuntu-artful-kernel.git] / include / linux / oom.h

#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;

	/* 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;
}

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

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

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

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 */
Commit	Line	Data
8ac773b4 AD	1	#ifndef __INCLUDE_LINUX_OOM_H
	2	#define __INCLUDE_LINUX_OOM_H
	3
5a3135c2	4
a63d83f4	5	#include <linux/sched.h>
172acf60	6	#include <linux/types.h>
4365a567	7	#include <linux/nodemask.h>
607ca46e	8	#include <uapi/linux/oom.h>
172acf60 DR	9
	10	struct zonelist;
	11	struct notifier_block;
74bcbf40 AM	12	struct mem_cgroup;
74bcbf40 AM	13	struct task_struct;
172acf60	14
8989e4c7 DR	15	/*
	16	* Details of the page allocation that triggered the oom killer that are used to
	17	* determine what should be killed.
	18	*/
6e0fc46d	19	struct oom_control {
8989e4c7	20	/* Used to determine cpuset */
6e0fc46d	21	struct zonelist *zonelist;
8989e4c7 DR	22
	23	/* Used to determine mempolicy */
	24	nodemask_t *nodemask;
	25
2a966b77 VD	26	/* Memory cgroup in which oom is invoked, or NULL for global oom */
	27	struct mem_cgroup *memcg;
	28
8989e4c7 DR	29	/* Used to determine cpuset and node locality requirement */
	30	const gfp_t gfp_mask;
	31
	32	/*
	33	* order == -1 means the oom kill is required by sysrq, otherwise only
	34	* for display purposes.
	35	*/
	36	const int order;
6e0fc46d	37
7c5f64f8 VD	38	/* Used by oom implementation, do not set */
	39	unsigned long totalpages;
	40	struct task_struct *chosen;
	41	unsigned long chosen_points;
9cbb78bb DR	42	};
9cbb78bb DR	43
dc56401f JW	44	extern struct mutex oom_lock;
dc56401f JW	45
e1e12d2f DR	46	static inline void set_current_oom_origin(void)
e1e12d2f DR	47	{
c96fc2d8	48	current->signal->oom_flag_origin = true;
e1e12d2f DR	49	}
	50
	51	static inline void clear_current_oom_origin(void)
	52	{
c96fc2d8	53	current->signal->oom_flag_origin = false;
e1e12d2f DR	54	}
	55
	56	static inline bool oom_task_origin(const struct task_struct *p)
	57	{
c96fc2d8	58	return p->signal->oom_flag_origin;
e1e12d2f	59	}
72788c38	60
862e3073 MH	61	static inline bool tsk_is_oom_victim(struct task_struct * tsk)
	62	{
	63	return tsk->signal->oom_mm;
	64	}
	65
a7f638f9 DR	66	extern unsigned long oom_badness(struct task_struct *p,
	67	struct mem_cgroup memcg, const nodemask_t nodemask,
	68	unsigned long totalpages);
5695be14	69
6e0fc46d	70	extern bool out_of_memory(struct oom_control *oc);
16e95196	71
38531201	72	extern void exit_oom_victim(void);
16e95196	73
5a3135c2 DR	74	extern int register_oom_notifier(struct notifier_block *nb);
	75	extern int unregister_oom_notifier(struct notifier_block *nb);
	76
7d2e7a22	77	extern bool oom_killer_disable(signed long timeout);
c32b3cbe	78	extern void oom_killer_enable(void);
8e4228e1	79
158e0a2d KH	80	extern struct task_struct find_lock_task_mm(struct task_struct p);
158e0a2d KH	81
8e4228e1 DR	82	/* sysctls */
	83	extern int sysctl_oom_dump_tasks;
	84	extern int sysctl_oom_kill_allocating_task;
	85	extern int sysctl_panic_on_oom;
5a3135c2	86	#endif /* _INCLUDE_LINUX_OOM_H */