linux-kernel - Re: [patch v2 2/7] blk-mq-sched: unify elevators checking for async requests

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Message-ID: <c8a08b5d-a221-4696-8bff-4fa80340a575@linux.ibm.com>
Date: Thu, 9 Oct 2025 16:45:19 +0530
From: Nilay Shroff <nilay@...ux.ibm.com>
To: Yu Kuai <yukuai1@...weicloud.com>, axboe@...nel.dk, bvanassche@....org,
        ming.lei@...hat.com, jmoyer@...hat.com
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com,
        johnny.chenyi@...wei.com
Subject: Re: [patch v2 2/7] blk-mq-sched: unify elevators checking for async
 requests



On 10/9/25 1:16 PM, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> bfq and mq-deadline consider sync writes as async requests and only
> resver tags for sync reads by async_depth, however, kyber doesn't
> consider sync writes as async requests for now.
> 
> Consider the case there are lots of dirty pages, and user use fsync to
> flush dirty pages. In this case sched_tags can be exhausted by sync writes
> and sync reads can stuck waiting for tag. Hence let kyber follow what
> mq-deadline and bfq did, and unify async requests checking for all
> elevators.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

Looks good to me:
Reviewed-by: Nilay Shroff <nilay@...ux.ibm.com>