On Mon, 10 Jul 2023 18:55:16 +0800, chengming.zhou@xxxxxxxxx wrote:
> The iocost rely on rq start_time_ns and alloc_time_ns to tell saturation
> state of the block device. Most of the time request is allocated after
> rq_qos_throttle() and its alloc_time_ns or start_time_ns won't be affected.
>
> But for plug batched allocation introduced by the commit 47c122e35d7e
> ("block: pre-allocate requests if plug is started and is a batch"), we can
> rq_qos_throttle() after the allocation of the request. This is what the
> blk_mq_get_cached_request() does.
>
> [...]
Applied, thanks!
[1/1] blk-mq: fix start_time_ns and alloc_time_ns for pre-allocated rq
commit: 5c17f45e91f5035c1b317e93b3dfb01088ac2902
Best regards,
--
Jens Axboe
