On Mon, Jun 25, 2018 at 07:31:44PM +0800, Ming Lei wrote: > Hi, > > The 1st two patches cleanes up blk_mq_get_driver_tag() and > blk_mq_mark_tag_wait(). > > The 3rd patch fixes one race between adding hctx->dispatch_wait to > wq and removing it from wq. > > The 4th patch avoids to iterate on all queues which share same tags > after completing one request, so that we can kill the synchronize_rcu() > in patch of queue cleanup, then long delay can be avoided during SCSI LUN > probe. Meantime IO performance can be improved. > > The 5th patch avoids to synchronizing rcu in blk_cleanup_queue() when > queue isn't initialized, so long delay can be avoided during SCSI LUN > probe too. > > Ming Lei (5): > blk-mq: cleanup blk_mq_get_driver_tag() > blk-mq: don't pass **hctx to blk_mq_mark_tag_wait() > blk-mq: introduce new lock for protecting hctx->dispatch_wait > blk-mq: remove synchronize_rcu() from blk_mq_del_queue_tag_set() > blk-mq: avoid to synchronize rcu inside blk_cleanup_queue() > > block/blk-core.c | 8 +++-- > block/blk-mq-sched.c | 85 +++----------------------------------------------- > block/blk-mq.c | 68 +++++++++++++++++++--------------------- > block/blk-mq.h | 3 +- > include/linux/blk-mq.h | 1 + > include/linux/blkdev.h | 2 -- > 6 files changed, 45 insertions(+), 122 deletions(-) > > Cc: Omar Sandoval <osandov@xxxxxx> > Cc: Andrew Jones <drjones@xxxxxxxxxx> > Cc: Bart Van Assche <bart.vanassche@xxxxxxx> > Cc: linux-scsi@xxxxxxxxxxxxxxx > Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx> > Cc: Christoph Hellwig <hch@xxxxxx> > > I gave the series a test run and it worked for me. So Tested-by: Andrew Jones <drjones@xxxxxxxxxx> Thanks, drew
