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| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2017-04-08 01:50:44 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-04-24 21:06:19 +0200 |
| commit | 06eb061f48594aa369f6e852b352410298b317a8 (patch) | |
| tree | 02c868ed14c9682c49a4f469edad71d730413fd8 /drivers/md/dm-rq.c | |
| parent | dm era: save spacemap metadata root after the pre-commit (diff) | |
| download | linux-06eb061f48594aa369f6e852b352410298b317a8.tar.xz linux-06eb061f48594aa369f6e852b352410298b317a8.zip | |
dm mpath: requeue after a small delay if blk_get_request() fails
If blk_get_request() returns ENODEV then multipath_clone_and_map()
causes a request to be requeued immediately. This can cause a kworker
thread to spend 100% of the CPU time of a single core in
__blk_mq_run_hw_queue() and also can cause device removal to never
finish.
Avoid this by only requeuing after a delay if blk_get_request() fails.
Additionally, reduce the requeue delay.
Cc: stable@vger.kernel.org # 4.9+
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-rq.c')
| -rw-r--r-- | drivers/md/dm-rq.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index 28955b94d2b2..90756a56c4d3 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -280,7 +280,7 @@ static void dm_requeue_original_request(struct dm_rq_target_io *tio, bool delay_ if (!rq->q->mq_ops) dm_old_requeue_request(rq); else - dm_mq_delay_requeue_request(rq, delay_requeue ? 5000 : 0); + dm_mq_delay_requeue_request(rq, delay_requeue ? 100/*ms*/ : 0); rq_completed(md, rw, false); } |