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blk-iolatency: clear use_delay when io.latency is set to zero

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If use_delay was non-zero when the latency target of a cgroup was set
to zero, it will stay stuck until io.latency is enabled on the cgroup
again.  This keeps readahead disabled for the cgroup impacting
performance negatively.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Josef Bacik <jbacik@fb.com>
Fixes: d706751215 ("block: introduce blk-iolatency io controller")
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2019-06-13 15:30:37 -07:00 committed by Jens Axboe
parent f1f8f292cd
commit 5de0073fcd
1 changed files with 3 additions and 1 deletions
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4
block/blk-iolatency.c
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@ -778,8 +778,10 @@ static int iolatency_set_min_lat_nsec(struct blkcg_gq *blkg, u64 val)
if (!oldval && val)
return 1;
if (oldval && !val)
if (oldval && !val) {
blkcg_clear_delay(blkg);
return -1;
}
return 0;
}