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| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2017-04-07 11:16:54 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-04-07 12:27:10 -0600 |
| commit | 6077c2d706097c00d8f2fed57d3f3c45cd228ee8 (patch) | |
| tree | 5acae1a06b2b108a20a84697422159321843c2ba | |
| parent | 36e3cf273977da34a760d513e1bef8431a9abaa0 (diff) | |
| download | linux-6077c2d706097c00d8f2fed57d3f3c45cd228ee8.tar.gz | |
dm rq: Avoid that request processing stalls sporadically
While running the srp-test software I noticed that request
processing stalls sporadically at the beginning of a test, namely
when mkfs is run against a dm-mpath device. Every time when that
happened the following command was sufficient to resume request
processing:
echo run >/sys/kernel/debug/block/dm-0/state
This patch avoids that such request processing stalls occur. The
test I ran is as follows:
while srp-test/run_tests -d -r 30 -t 02-mq; do :; done
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: dm-devel@redhat.com
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | drivers/md/dm-rq.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index 28955b94d2b26..0b081d170087d 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -755,6 +755,7 @@ static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, /* Undo dm_start_request() before requeuing */ rq_end_stats(md, rq); rq_completed(md, rq_data_dir(rq), false); + blk_mq_delay_run_hw_queue(hctx, 100/*ms*/); return BLK_MQ_RQ_QUEUE_BUSY; } |