Re: [PATCH V3 0/5] loop: improve loop aio perf by IOCB_NOWAIT

Jens Axboe
2025-03-22T17:40:08Z

On Sat, 22 Mar 2025 09:26:09 +0800, Ming Lei wrote:
> 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.
>
> In my test VM, loop disk perf becomes very close to perf of the backing block
> device(nvme/mq virtio-scsi).
>
> And Mikulas verified that this way can improve 12jobs sequential rw io by
> ~5X, and basically solve the reported problem together with loop MQ change.
>
> [...]

Applied, thanks!

[1/5] loop: simplify do_req_filebacked()
commit: 04dcb8a909b5b68464ec5ccb123e9614f3ac333d
[2/5] loop: cleanup lo_rw_aio()
commit: 832c9fec8e2314170c5451023565b94f05477aa7
[3/5] loop: move command blkcg/memcg initialization into loop_queue_work
commit: a23d34a31758000b2b158288226bf24f96d8864d
[4/5] loop: try to handle loop aio command via NOWAIT IO first
commit: dfc77a934a3acdb13dadf237b7417c6a31b19da8
[5/5] loop: add hint for handling aio via IOCB_NOWAIT
commit: 4c3f4bad7a6e9022489a9f8392f7147ed3ce74b1

Best regards,
--
Jens Axboe