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, can you pick up this blk-mq changes (patch 1)? 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. Mike Snitzer (3): blk-mq: introduce blk_mq_delay_kick_requeue_list() dm rq: add DM_MAPIO_DELAY_REQUEUE to delay requeue of blk-mq requests dm mpath: delay the requeue of blk-mq requests while all paths down block/blk-mq.c | 15 +++++++++++---- drivers/md/dm-mpath.c | 15 +++++++++------ drivers/md/dm-rq.c | 35 ++++++++++++++++++++--------------- include/linux/blk-mq.h | 1 + include/linux/blkdev.h | 2 +- include/linux/device-mapper.h | 1 + 6 files changed, 43 insertions(+), 26 deletions(-) -- 2.7.4 (Apple Git-66) -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
