2009-12-04 01:59:42 +08:00
|
|
|
#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>
|
|
|
|
|
2010-03-11 07:22:11 +08:00
|
|
|
#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
|
2009-12-04 04:06:43 +08:00
|
|
|
|
2010-04-09 14:31:19 +08:00
|
|
|
enum stat_type {
|
|
|
|
/* Total time spent (in ns) between request dispatch to the driver and
|
|
|
|
* request completion for IOs doen by this cgroup. This may not be
|
|
|
|
* accurate when NCQ is turned on. */
|
|
|
|
BLKIO_STAT_SERVICE_TIME = 0,
|
|
|
|
/* Total bytes transferred */
|
|
|
|
BLKIO_STAT_SERVICE_BYTES,
|
|
|
|
/* Total IOs serviced, post merge */
|
|
|
|
BLKIO_STAT_SERVICED,
|
|
|
|
/* Total time spent waiting in scheduler queue in ns */
|
|
|
|
BLKIO_STAT_WAIT_TIME,
|
|
|
|
/* All the single valued stats go below this */
|
|
|
|
BLKIO_STAT_TIME,
|
|
|
|
BLKIO_STAT_SECTORS,
|
|
|
|
#ifdef CONFIG_DEBUG_BLK_CGROUP
|
|
|
|
BLKIO_STAT_DEQUEUE
|
|
|
|
#endif
|
|
|
|
};
|
|
|
|
|
|
|
|
enum stat_sub_type {
|
|
|
|
BLKIO_STAT_READ = 0,
|
|
|
|
BLKIO_STAT_WRITE,
|
|
|
|
BLKIO_STAT_SYNC,
|
|
|
|
BLKIO_STAT_ASYNC,
|
|
|
|
BLKIO_STAT_TOTAL
|
2010-04-02 06:01:24 +08:00
|
|
|
};
|
|
|
|
|
2009-12-04 01:59:42 +08:00
|
|
|
struct blkio_cgroup {
|
|
|
|
struct cgroup_subsys_state css;
|
|
|
|
unsigned int weight;
|
|
|
|
spinlock_t lock;
|
|
|
|
struct hlist_head blkg_list;
|
|
|
|
};
|
|
|
|
|
2010-04-02 06:01:24 +08:00
|
|
|
struct blkio_group_stats {
|
|
|
|
/* total disk time and nr sectors dispatched by this group */
|
|
|
|
uint64_t time;
|
|
|
|
uint64_t sectors;
|
2010-04-09 14:31:19 +08:00
|
|
|
uint64_t stat_arr[BLKIO_STAT_WAIT_TIME + 1][BLKIO_STAT_TOTAL];
|
2010-04-02 06:01:24 +08:00
|
|
|
#ifdef CONFIG_DEBUG_BLK_CGROUP
|
|
|
|
/* How many times this group has been removed from service tree */
|
|
|
|
unsigned long dequeue;
|
|
|
|
#endif
|
|
|
|
};
|
|
|
|
|
2009-12-04 01:59:42 +08:00
|
|
|
struct blkio_group {
|
|
|
|
/* An rcu protected unique identifier for the group */
|
|
|
|
void *key;
|
|
|
|
struct hlist_node blkcg_node;
|
2009-12-04 01:59:47 +08:00
|
|
|
unsigned short blkcg_id;
|
2009-12-04 01:59:48 +08:00
|
|
|
#ifdef CONFIG_DEBUG_BLK_CGROUP
|
|
|
|
/* Store cgroup path */
|
|
|
|
char path[128];
|
|
|
|
#endif
|
2009-12-04 01:59:49 +08:00
|
|
|
/* The device MKDEV(major, minor), this group has been created for */
|
2010-04-09 14:31:19 +08:00
|
|
|
dev_t dev;
|
2009-12-04 01:59:49 +08:00
|
|
|
|
2010-04-02 06:01:24 +08:00
|
|
|
/* Need to serialize the stats in the case of reset/update */
|
|
|
|
spinlock_t stats_lock;
|
|
|
|
struct blkio_group_stats stats;
|
2009-12-04 01:59:42 +08:00
|
|
|
};
|
|
|
|
|
2009-12-04 23:36:42 +08:00
|
|
|
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 *);
|
|
|
|
|
2009-12-04 04:06:43 +08:00
|
|
|
#else
|
|
|
|
|
|
|
|
struct blkio_group {
|
|
|
|
};
|
|
|
|
|
2009-12-04 23:36:42 +08:00
|
|
|
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) { }
|
|
|
|
|
2009-12-04 04:06:43 +08:00
|
|
|
#endif
|
|
|
|
|
2009-12-04 01:59:42 +08:00
|
|
|
#define BLKIO_WEIGHT_MIN 100
|
|
|
|
#define BLKIO_WEIGHT_MAX 1000
|
|
|
|
#define BLKIO_WEIGHT_DEFAULT 500
|
|
|
|
|
2009-12-04 01:59:48 +08:00
|
|
|
#ifdef CONFIG_DEBUG_BLK_CGROUP
|
|
|
|
static inline char *blkg_path(struct blkio_group *blkg)
|
|
|
|
{
|
|
|
|
return blkg->path;
|
|
|
|
}
|
2010-04-02 06:01:41 +08:00
|
|
|
void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
|
2009-12-04 01:59:49 +08:00
|
|
|
unsigned long dequeue);
|
2009-12-04 01:59:48 +08:00
|
|
|
#else
|
|
|
|
static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
|
2010-04-02 06:01:41 +08:00
|
|
|
static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
|
|
|
|
unsigned long dequeue) {}
|
2009-12-04 01:59:48 +08:00
|
|
|
#endif
|
|
|
|
|
2010-03-11 07:22:11 +08:00
|
|
|
#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
|
2009-12-04 01:59:42 +08:00
|
|
|
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,
|
2009-12-04 01:59:49 +08:00
|
|
|
struct blkio_group *blkg, void *key, dev_t dev);
|
2009-12-04 01:59:42 +08:00
|
|
|
extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
|
|
|
|
extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
|
|
|
|
void *key);
|
2010-04-09 14:31:19 +08:00
|
|
|
void blkio_group_init(struct blkio_group *blkg);
|
2010-04-02 06:01:24 +08:00
|
|
|
void blkiocg_update_timeslice_used(struct blkio_group *blkg,
|
|
|
|
unsigned long time);
|
2010-04-09 14:31:19 +08:00
|
|
|
void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
|
|
|
|
bool direction, bool sync);
|
|
|
|
void blkiocg_update_completion_stats(struct blkio_group *blkg,
|
|
|
|
uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
|
2009-12-04 01:59:42 +08:00
|
|
|
#else
|
2009-12-04 04:06:43 +08:00
|
|
|
struct cgroup;
|
2009-12-04 01:59:42 +08:00
|
|
|
static inline struct blkio_cgroup *
|
|
|
|
cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
|
|
|
|
|
2010-04-09 14:31:19 +08:00
|
|
|
static inline void blkio_group_init(struct blkio_group *blkg) {}
|
2009-12-04 01:59:42 +08:00
|
|
|
static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
|
2010-04-09 14:31:19 +08:00
|
|
|
struct blkio_group *blkg, void *key, dev_t dev) {}
|
2009-12-04 01:59:42 +08:00
|
|
|
|
|
|
|
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; }
|
2010-04-02 06:01:24 +08:00
|
|
|
static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
|
2010-04-02 06:01:04 +08:00
|
|
|
unsigned long time) {}
|
2010-04-09 14:31:19 +08:00
|
|
|
static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
|
|
|
|
uint64_t bytes, bool direction, bool sync) {}
|
|
|
|
static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
|
|
|
|
uint64_t start_time, uint64_t io_start_time, bool direction,
|
|
|
|
bool sync) {}
|
2009-12-04 01:59:42 +08:00
|
|
|
#endif
|
|
|
|
#endif /* _BLK_CGROUP_H */
|