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(parent: 9f4c3f8) | patch
dm rq: add DM_MAPIO_DELAY_REQUEUE to delay requeue of blk-mq requests
authorMike Snitzer <snitzer@redhat.com>
Fri, 9 Sep 2016 23:24:57 +0000 (19:24 -0400)
committerMike Snitzer <snitzer@redhat.com>
Wed, 14 Sep 2016 17:56:38 +0000 (13:56 -0400)
commita8ac51e4ab97765838ae6a07d6ff7f7bfaaa0ea3
tree1bc9e863ee44b4991b9c467659503f681bb4398etree | snapshot
parent9f4c3f874a3ab8fb845dd2f04f4396ebc5c1f225commit | diff
dm rq: add DM_MAPIO_DELAY_REQUEUE to delay requeue of blk-mq requests

Otherwise blk-mq will immediately dispatch requests that are requeued
via a BLK_MQ_RQ_QUEUE_BUSY return from blk_mq_ops .queue_rq.

Delayed requeue is implemented using blk_mq_delay_kick_requeue_list()
with a delay of 5 secs.  In the context of DM multipath (all paths down)
it doesn't make any sense to requeue more quickly.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
drivers/md/dm-rq.c diff | blob | history
include/linux/device-mapper.h diff | blob | history
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