提交 5de0073f 编写于 作者: T Tejun Heo 提交者: Jens Axboe

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

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: NTejun Heo <tj@kernel.org>
Cc: Josef Bacik <jbacik@fb.com>
Fixes: d7067512 ("block: introduce blk-iolatency io controller")
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: NJens Axboe <axboe@kernel.dk>
上级 f1f8f292
......@@ -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;
}
......
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