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| author | Tejun Heo <tj@kernel.org> | 2019-06-13 15:30:37 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 09:11:10 +0200 |
| commit | c600458bb020e592ad29bf2449957e0a43f026b2 (patch) | |
| tree | 2d4248227bc83f64d7ef6e3de5e54c86ca6891a1 /block | |
| parent | 86ace02c805962af262d03421949c2fa1d7a7fff (diff) | |
| download | linux-stable-c600458bb020e592ad29bf2449957e0a43f026b2.tar.gz linux-stable-c600458bb020e592ad29bf2449957e0a43f026b2.tar.bz2 linux-stable-c600458bb020e592ad29bf2449957e0a43f026b2.zip | |
blk-iolatency: clear use_delay when io.latency is set to zero
commit 5de0073fcd50cc1f150895a7bb04d3cf8067b1d7 upstream.
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: d70675121546 ("block: introduce blk-iolatency io controller")
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-iolatency.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c index a1eb5e9ac904..d973c38ee4fd 100644 --- a/block/blk-iolatency.c +++ b/block/blk-iolatency.c @@ -759,8 +759,10 @@ 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; } |