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block: simplify I/O stat accounting

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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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jerome Marchand 2009-04-22 14:01:49 +02:00 • committed by Jens Axboe
commit 42dad7647a
5 changed files with 12 additions and 13 deletions
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4
block/blk-sysfs.c
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@ -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;