loop: improve loop aio perf by IOCB

From:		Ming Lei <ming.lei-AT-redhat.com>
To:		Jens Axboe <axboe-AT-kernel.dk>, linux-block-AT-vger.kernel.org
Subject:		[PATCH 0/5] loop: improve loop aio perf by IOCB_NOWAIT
Date:		Sun, 09 Mar 2025 00:14:50 +0800
Message-ID:		<20250308161504.1639157-1-ming.lei@redhat.com>
Cc:		Ming Lei <ming.lei-AT-redhat.com>
Archive-link:		Article

Hello Jens,

This patchset improves loop aio perf by using IOCB_NOWAIT for avoiding to queue aio
command to workqueue context, meantime refactor lo_rw_aio() a bit.

The last patch adds MQ support, which improves perf a bit in case of multiple
IO jobs.

In my test VM, loop disk perf becomes very close to perf of the backing block
device(nvme/mq virtio-scsi).

Thanks,
Ming


Ming Lei (5):
  loop: remove 'rw' parameter from lo_rw_aio()
  loop: cleanup lo_rw_aio()
  loop: add helper loop_queue_work_prep
  loop: try to handle loop aio command via NOWAIT IO first
  loop: add module parameter of 'nr_hw_queues'

 drivers/block/loop.c | 225 ++++++++++++++++++++++++++++++-------------
 1 file changed, 156 insertions(+), 69 deletions(-)

-- 
2.47.0

loop: improve loop aio perf by IOCB_NOWAIT