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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>
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@ -755,6 +755,7 @@ static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
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/* Undo dm_start_request() before requeuing */
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rq_end_stats(md, rq);
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rq_completed(md, rq_data_dir(rq), false);
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blk_mq_delay_run_hw_queue(hctx, 100/*ms*/);
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return BLK_MQ_RQ_QUEUE_BUSY;
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}
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