On Wed, Jul 25, 2018 at 02:33:14PM -0700, Omar Sandoval wrote: > On Wed, Jul 04, 2018 at 01:29:56PM +0800, Ming Lei wrote: > > SCSI may have lots of channels, targets or LUNs, so it may > > take long time for creating and cleaning up queues. > > > > So introduce block/023 and uses null_blk to run this test > > on both blk-mq and legacy mode, then compare both and check > > the difference. > > > > Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx> > > --- > > tests/block/023 | 101 ++++++++++++++++++++++++++++++++++++++++++++++++++++ > > tests/block/023.out | 2 ++ > > 2 files changed, 103 insertions(+) > > create mode 100755 tests/block/023 > > create mode 100755 tests/block/023.out > > Hi, Ming, is this a regression test for "blk-mq: remove > synchronize_rcu() from blk_mq_del_queue_tag_set()" and "blk-mq: avoid to > synchronize rcu inside blk_cleanup_queue()"? Yeah, it is. It also shows that destroying queue may take much more time than creating queue, and seems no solution for this one now. Thanks, Ming
