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Commit b7143fe6 authored by Aleksei Zakharov's avatar Aleksei Zakharov Committed by Jens Axboe
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block: avoid setting wbt_lat_usec to current value 



There's no reason to set wbt min lat and freeze request queue
if current value is the same.

Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarAleksei Zakharov <zakharov.a.g@yandex.ru>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 0586942f

block/blk-sysfs.c

+3 −0
Original line number Diff line number Diff line
@@ -468,6 +468,9 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, 
	else if (val >= 0)

		val *= 1000ULL;



	if (wbt_get_min_lat(q) == val)

		return count;



	/*

	 * Ensure that the queue is idled, in case the latency update

	 * ends up either enabling or disabling wbt completely. We can't