From b7143fe67bfc3b83a9e11371da659e1e70a1bbf3 Mon Sep 17 00:00:00 2001 From: Aleksei Zakharov Date: Mon, 11 Feb 2019 13:10:34 +0300 Subject: 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: Johannes Thumshirn Signed-off-by: Aleksei Zakharov Signed-off-by: Jens Axboe --- block/blk-sysfs.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'block') diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 94e1b052abbc..59685918167e 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -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 -- cgit v1.2.3-59-g8ed1b