diff options
| author | Jerome Marchand <jmarchan@redhat.com> | 2009-04-22 14:01:49 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-04-24 08:54:21 +0200 |
| commit | 42dad7647aec49b3ad20dd0cb832b232a6ae514f (patch) | |
| tree | b70d4cb7706f2647e65426e24f078ddf14d6e139 /block/blk-sysfs.c | |
| parent | 097102c2d04974bdfcfa16a5f3062d499842139c (diff) | |
| download | lwn-42dad7647aec49b3ad20dd0cb832b232a6ae514f.tar.gz lwn-42dad7647aec49b3ad20dd0cb832b232a6ae514f.zip | |
block: simplify I/O stat accounting
This simplifies I/O stat accounting switching code and separates it
completely from I/O scheduler switch code.
Requests are accounted according to the state of their request queue
at the time of the request allocation. There is no need anymore to
flush the request queue when switching I/O accounting state.
Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-sysfs.c')
| -rw-r--r-- | block/blk-sysfs.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index cac4e9febe6a..3ff9bba3379a 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -209,14 +209,10 @@ static ssize_t queue_iostats_store(struct request_queue *q, const char *page, ssize_t ret = queue_var_store(&stats, page, count); spin_lock_irq(q->queue_lock); - elv_quiesce_start(q); - if (stats) queue_flag_set(QUEUE_FLAG_IO_STAT, q); else queue_flag_clear(QUEUE_FLAG_IO_STAT, q); - - elv_quiesce_end(q); spin_unlock_irq(q->queue_lock); return ret; |