[mirror_ubuntu-artful-kernel.git] / block / blk-cgroup.h

#ifndef _BLK_CGROUP_H
#define _BLK_CGROUP_H
/*
 * Common Block IO controller cgroup interface
 *
 * Based on ideas and code from CFQ, CFS and BFQ:
 * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
 *
 * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
 *		      Paolo Valente <paolo.valente@unimore.it>
 *
 * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
 * 	              Nauman Rafique <nauman@google.com>
 */

#include <linux/cgroup.h>

#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)

#ifndef CONFIG_BLK_CGROUP
/* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */
extern struct cgroup_subsys blkio_subsys;
#define blkio_subsys_id blkio_subsys.subsys_id
#endif

enum io_type {
	IO_READ = 0,
	IO_WRITE,
	IO_SYNC,
	IO_ASYNC,
	IO_TYPE_MAX
};

struct blkio_cgroup {
	struct cgroup_subsys_state css;
	unsigned int weight;
	spinlock_t lock;
	struct hlist_head blkg_list;
};

struct blkio_group_stats {
	/* total disk time and nr sectors dispatched by this group */
	uint64_t time;
	uint64_t sectors;
	/* Total disk time used by IOs in ns */
	uint64_t io_service_time[IO_TYPE_MAX];
	uint64_t io_service_bytes[IO_TYPE_MAX]; /* Total bytes transferred */
	/* Total IOs serviced, post merge */
	uint64_t io_serviced[IO_TYPE_MAX];
	/* Total time spent waiting in scheduler queue in ns */
	uint64_t io_wait_time[IO_TYPE_MAX];
#ifdef CONFIG_DEBUG_BLK_CGROUP
	/* How many times this group has been removed from service tree */
	unsigned long dequeue;
#endif
};

struct blkio_group {
	/* An rcu protected unique identifier for the group */
	void *key;
	struct hlist_node blkcg_node;
	unsigned short blkcg_id;
#ifdef CONFIG_DEBUG_BLK_CGROUP
	/* Store cgroup path */
	char path[128];
#endif
	/* The device MKDEV(major, minor), this group has been created for */
	dev_t   dev;

	/* Need to serialize the stats in the case of reset/update */
	spinlock_t stats_lock;
	struct blkio_group_stats stats;
};

typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);
typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
						unsigned int weight);

struct blkio_policy_ops {
	blkio_unlink_group_fn *blkio_unlink_group_fn;
	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
};

struct blkio_policy_type {
	struct list_head list;
	struct blkio_policy_ops ops;
};

/* Blkio controller policy registration */
extern void blkio_policy_register(struct blkio_policy_type *);
extern void blkio_policy_unregister(struct blkio_policy_type *);

#else

struct blkio_group {
};

struct blkio_policy_type {
};

static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }

#endif

#define BLKIO_WEIGHT_MIN	100
#define BLKIO_WEIGHT_MAX	1000
#define BLKIO_WEIGHT_DEFAULT	500

#ifdef CONFIG_DEBUG_BLK_CGROUP
static inline char *blkg_path(struct blkio_group *blkg)
{
	return blkg->path;
}
void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
				unsigned long dequeue);
#else
static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
						unsigned long dequeue) {}
#endif

#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
extern struct blkio_cgroup blkio_root_cgroup;
extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
			struct blkio_group *blkg, void *key, dev_t dev);
extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
						void *key);
void blkiocg_update_timeslice_used(struct blkio_group *blkg,
					unsigned long time);
void blkiocg_update_request_dispatch_stats(struct blkio_group *blkg,
						struct request *rq);
void blkiocg_update_request_completion_stats(struct blkio_group *blkg,
						struct request *rq);
#else
struct cgroup;
static inline struct blkio_cgroup *
cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }

static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
			struct blkio_group *blkg, void *key, dev_t dev)
{
}

static inline int
blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }

static inline struct blkio_group *
blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; }
static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
						unsigned long time) {}
static inline void blkiocg_update_request_dispatch_stats(
		struct blkio_group *blkg, struct request *rq) {}
static inline void blkiocg_update_request_completion_stats(
		struct blkio_group *blkg, struct request *rq) {}
#endif
#endif /* _BLK_CGROUP_H */
Commit	Line	Data
31e4c28d VG	1	#ifndef _BLK_CGROUP_H
	2	#define _BLK_CGROUP_H
	3	/*
	4	* Common Block IO controller cgroup interface
	5	*
	6	* Based on ideas and code from CFQ, CFS and BFQ:
	7	* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
	8	*
	9	* Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
	10	* Paolo Valente <paolo.valente@unimore.it>
	11	*
	12	* Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
	13	* Nauman Rafique <nauman@google.com>
	14	*/
	15
	16	#include <linux/cgroup.h>
	17
67523c48 BB	18	#if defined(CONFIG_BLK_CGROUP) \|\| defined(CONFIG_BLK_CGROUP_MODULE)
	19
	20	#ifndef CONFIG_BLK_CGROUP
	21	/* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */
	22	extern struct cgroup_subsys blkio_subsys;
	23	#define blkio_subsys_id blkio_subsys.subsys_id
	24	#endif
2f5ea477	25
303a3acb DS	26	enum io_type {
	27	IO_READ = 0,
	28	IO_WRITE,
	29	IO_SYNC,
	30	IO_ASYNC,
	31	IO_TYPE_MAX
	32	};
	33
31e4c28d VG	34	struct blkio_cgroup {
	35	struct cgroup_subsys_state css;
	36	unsigned int weight;
	37	spinlock_t lock;
	38	struct hlist_head blkg_list;
	39	};
	40
303a3acb DS	41	struct blkio_group_stats {
	42	/* total disk time and nr sectors dispatched by this group */
	43	uint64_t time;
	44	uint64_t sectors;
	45	/* Total disk time used by IOs in ns */
	46	uint64_t io_service_time[IO_TYPE_MAX];
	47	uint64_t io_service_bytes[IO_TYPE_MAX]; /* Total bytes transferred */
	48	/* Total IOs serviced, post merge */
	49	uint64_t io_serviced[IO_TYPE_MAX];
	50	/* Total time spent waiting in scheduler queue in ns */
	51	uint64_t io_wait_time[IO_TYPE_MAX];
	52	#ifdef CONFIG_DEBUG_BLK_CGROUP
	53	/* How many times this group has been removed from service tree */
	54	unsigned long dequeue;
	55	#endif
	56	};
	57
31e4c28d VG	58	struct blkio_group {
	59	/* An rcu protected unique identifier for the group */
	60	void *key;
	61	struct hlist_node blkcg_node;
b1c35769	62	unsigned short blkcg_id;
2868ef7b VG	63	#ifdef CONFIG_DEBUG_BLK_CGROUP
	64	/* Store cgroup path */
	65	char path[128];
	66	#endif
22084190 VG	67	/* The device MKDEV(major, minor), this group has been created for */
	68	dev_t dev;
	69
303a3acb DS	70	/* Need to serialize the stats in the case of reset/update */
	71	spinlock_t stats_lock;
	72	struct blkio_group_stats stats;
31e4c28d VG	73	};
31e4c28d VG	74
3e252066 VG	75	typedef void (blkio_unlink_group_fn) (void key, struct blkio_group blkg);
	76	typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
	77	unsigned int weight);
	78
	79	struct blkio_policy_ops {
	80	blkio_unlink_group_fn *blkio_unlink_group_fn;
	81	blkio_update_group_weight_fn *blkio_update_group_weight_fn;
	82	};
	83
	84	struct blkio_policy_type {
	85	struct list_head list;
	86	struct blkio_policy_ops ops;
	87	};
	88
	89	/* Blkio controller policy registration */
	90	extern void blkio_policy_register(struct blkio_policy_type *);
	91	extern void blkio_policy_unregister(struct blkio_policy_type *);
	92
2f5ea477 JA	93	#else
	94
	95	struct blkio_group {
	96	};
	97
3e252066 VG	98	struct blkio_policy_type {
	99	};
	100
	101	static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
	102	static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
	103
2f5ea477 JA	104	#endif
2f5ea477 JA	105
31e4c28d VG	106	#define BLKIO_WEIGHT_MIN 100
	107	#define BLKIO_WEIGHT_MAX 1000
	108	#define BLKIO_WEIGHT_DEFAULT 500
	109
2868ef7b VG	110	#ifdef CONFIG_DEBUG_BLK_CGROUP
	111	static inline char blkg_path(struct blkio_group blkg)
	112	{
	113	return blkg->path;
	114	}
9195291e	115	void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
22084190	116	unsigned long dequeue);
2868ef7b VG	117	#else
2868ef7b VG	118	static inline char blkg_path(struct blkio_group blkg) { return NULL; }
9195291e DS	119	static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
9195291e DS	120	unsigned long dequeue) {}
2868ef7b VG	121	#endif
2868ef7b VG	122
67523c48	123	#if defined(CONFIG_BLK_CGROUP) \|\| defined(CONFIG_BLK_CGROUP_MODULE)
31e4c28d VG	124	extern struct blkio_cgroup blkio_root_cgroup;
	125	extern struct blkio_cgroup cgroup_to_blkio_cgroup(struct cgroup cgroup);
	126	extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
22084190	127	struct blkio_group blkg, void key, dev_t dev);
31e4c28d VG	128	extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
	129	extern struct blkio_group blkiocg_lookup_group(struct blkio_cgroup blkcg,
	130	void *key);
303a3acb DS	131	void blkiocg_update_timeslice_used(struct blkio_group *blkg,
303a3acb DS	132	unsigned long time);
9195291e DS	133	void blkiocg_update_request_dispatch_stats(struct blkio_group *blkg,
	134	struct request *rq);
	135	void blkiocg_update_request_completion_stats(struct blkio_group *blkg,
	136	struct request *rq);
31e4c28d	137	#else
2f5ea477	138	struct cgroup;
31e4c28d VG	139	static inline struct blkio_cgroup *
	140	cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
	141
	142	static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
22084190	143	struct blkio_group blkg, void key, dev_t dev)
31e4c28d VG	144	{
	145	}
	146
	147	static inline int
	148	blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
	149
	150	static inline struct blkio_group *
	151	blkiocg_lookup_group(struct blkio_cgroup blkcg, void key) { return NULL; }
303a3acb	152	static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
9a0785b0	153	unsigned long time) {}
9195291e DS	154	static inline void blkiocg_update_request_dispatch_stats(
	155	struct blkio_group blkg, struct request rq) {}
	156	static inline void blkiocg_update_request_completion_stats(
	157	struct blkio_group blkg, struct request rq) {}
31e4c28d VG	158	#endif
31e4c28d VG	159	#endif /* _BLK_CGROUP_H */