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blkcg: remove blkio_group->path[]

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blkio_group->path[] stores the path of the associated cgroup and is
used only for debug messages.  Just format the path from blkg->cgroup
when printing debug messages.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2012-04-16 13:57:23 -07:00 committed by Jens Axboe
parent c94bed8999
commit 54e7ed12ba
4 changed files with 36 additions and 14 deletions
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1
block/blk-cgroup.c
View File

@ -114,7 +114,6 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
INIT_LIST_HEAD(&blkg->q_node);
blkg->blkcg = blkcg;
blkg->refcnt = 1;
cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path));
for (i = 0; i < BLKCG_MAX_POLS; i++) {
struct blkio_policy_type *pol = blkio_policy[i];

21
block/blk-cgroup.h
View File

@ -77,8 +77,6 @@ struct blkio_group {
struct list_head q_node;
struct hlist_node blkcg_node;
struct blkio_cgroup *blkcg;
/* Store cgroup path */
char path[128];
/* reference count */
int refcnt;
@ -167,9 +165,24 @@ static inline struct blkio_group *pdata_to_blkg(void *pdata)
return NULL;
}
static inline char *blkg_path(struct blkio_group *blkg)
/**
* blkg_path - format cgroup path of blkg
* @blkg: blkg of interest
* @buf: target buffer
* @buflen: target buffer length
*
* Format the path of the cgroup of @blkg into @buf.
*/
static inline int blkg_path(struct blkio_group *blkg, char *buf, int buflen)
{
return blkg->path;
int ret;
rcu_read_lock();
ret = cgroup_path(blkg->blkcg->css.cgroup, buf, buflen);
rcu_read_unlock();
if (ret)
strncpy(buf, "<unavailable>", buflen);
return ret;
}
/**

9
block/blk-throttle.c
View File

@ -155,9 +155,12 @@ static inline int throtl_tg_##name(const struct throtl_grp *tg) \
THROTL_TG_FNS(on_rr);
#define throtl_log_tg(td, tg, fmt, args...) \
blk_add_trace_msg((td)->queue, "throtl %s " fmt, \
blkg_path(tg_to_blkg(tg)), ##args); \
#define throtl_log_tg(td, tg, fmt, args...) do { \
char __pbuf[128]; \
\
blkg_path(tg_to_blkg(tg), __pbuf, sizeof(__pbuf)); \
blk_add_trace_msg((td)->queue, "throtl %s " fmt, __pbuf, ##args); \
} while (0)
#define throtl_log(td, fmt, args...) \
blk_add_trace_msg((td)->queue, "throtl " fmt, ##args)

19
block/cfq-iosched.c
View File

@ -573,14 +573,21 @@ static inline void cfqg_put(struct cfq_group *cfqg)
return blkg_put(cfqg_to_blkg(cfqg));
}
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) do { \
char __pbuf[128]; \
\
blkg_path(cfqg_to_blkg((cfqq)->cfqg), __pbuf, sizeof(__pbuf)); \
blk_add_trace_msg((cfqd)->queue, "cfq%d%c %s " fmt, (cfqq)->pid, \
cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
blkg_path(cfqg_to_blkg((cfqq)->cfqg)), ##args)
cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
__pbuf, ##args); \
} while (0)
#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "%s " fmt, \
blkg_path(cfqg_to_blkg((cfqg))), ##args) \
#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do { \
char __pbuf[128]; \
\
blkg_path(cfqg_to_blkg(cfqg), __pbuf, sizeof(__pbuf)); \
blk_add_trace_msg((cfqd)->queue, "%s " fmt, __pbuf, ##args); \
} while (0)
static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg,
struct cfq_group *curr_cfqg, int rw)