From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Mike Snitzer To: axboe@kernel.dk, dm-devel@redhat.com Cc: linux-block@vger.kernel.org Subject: [PATCH for-4.9 v2 0/6] [PATCH for-4.9 v2 0/3] allow delayed requeue of blk-mq requests Date: Wed, 14 Sep 2016 12:29:30 -0400 Message-Id: <1473870576-54331-1-git-send-email-snitzer@redhat.com> List-ID: I'd like to see these changes included during the 4.9 merge. The blk-mq change is a straight-forward switch from work_struct to delayed_work and the addition of the blk_mq_delay_kick_requeue_list() interface. Jens, please pick up the first patch and I'll rebase linux-dm.git ontop of your 4.9 branch. Hannes, please re-review/ack as you like. These changes offer reduced CPU utilization during DM multipath's all path down case (when 'queue_if_no_path' is enabled). Please see each patch's header for more details. v2: fixed 'msecs' variable name to be 'delay' in blk-mq, use msecs_to_jiffies() in dm-rq call to blk-mq, also made DM-mpath kick the queue if/when a path is reinstated Mike Snitzer (6): blk-mq: introduce blk_mq_delay_kick_requeue_list() dm rq: add DM_MAPIO_DELAY_REQUEUE to delay requeue of blk-mq requests dm rq: reduce arguments passed to map_request() and dm_requeue_original_request() dm rq: introduce dm_mq_kick_requeue_list() dm mpath: use dm_mq_kick_requeue_list() dm mpath: delay the requeue of blk-mq requests while all paths down block/blk-mq.c | 15 ++++++++--- drivers/md/dm-mpath.c | 29 ++++++++++++--------- drivers/md/dm-rq.c | 59 ++++++++++++++++++++++++++----------------- drivers/md/dm-rq.h | 2 ++ include/linux/blk-mq.h | 1 + include/linux/blkdev.h | 2 +- include/linux/device-mapper.h | 1 + 7 files changed, 69 insertions(+), 40 deletions(-) -- 2.7.4 (Apple Git-66)