mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 23:14:31 +08:00
67523c48aa
Modify the Block I/O cgroup subsystem to be able to be built as a module. As the CFQ disk scheduler optionally depends on blk-cgroup, config options in block/Kconfig, block/Kconfig.iosched, and block/blk-cgroup.h are enhanced to support the new module dependency. Signed-off-by: Ben Blum <bblum@andrew.cmu.edu> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
#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
|
|
|
|
struct blkio_cgroup {
|
|
struct cgroup_subsys_state css;
|
|
unsigned int weight;
|
|
spinlock_t lock;
|
|
struct hlist_head blkg_list;
|
|
};
|
|
|
|
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];
|
|
/* How many times this group has been removed from service tree */
|
|
unsigned long dequeue;
|
|
#endif
|
|
/* The device MKDEV(major, minor), this group has been created for */
|
|
dev_t dev;
|
|
|
|
/* total disk time and nr sectors dispatched by this group */
|
|
unsigned long time;
|
|
unsigned long sectors;
|
|
};
|
|
|
|
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_blkio_group_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_blkio_group_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_blkio_group_stats(struct blkio_group *blkg,
|
|
unsigned long time, unsigned long sectors);
|
|
#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_blkio_group_stats(struct blkio_group *blkg,
|
|
unsigned long time, unsigned long sectors)
|
|
{
|
|
}
|
|
#endif
|
|
#endif /* _BLK_CGROUP_H */
|