linux-kernel - Re: [PATCH v6 2/8] blk-mq-sched: unify elevators checking for async requests

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Message-ID: <4171e102-855b-43a2-bef0-dc0b42868827@suse.de>
Date: Fri, 21 Nov 2025 08:09:37 +0100
From: Hannes Reinecke <hare@...e.de>
To: Yu Kuai <yukuai@...as.com>, axboe@...nel.dk, nilay@...ux.ibm.com,
 bvanassche@....org, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/8] blk-mq-sched: unify elevators checking for async
 requests

On 11/21/25 06:28, Yu Kuai wrote:
> bfq and mq-deadline consider sync writes as async requests and only
> reserve 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 <yukuai@...as.com>
> Reviewed-by: Nilay Shroff <nilay@...ux.ibm.com>
> ---
>   block/bfq-iosched.c   | 2 +-
>   block/blk-mq-sched.h  | 5 +++++
>   block/kyber-iosched.c | 2 +-
>   block/mq-deadline.c   | 2 +-
>   4 files changed, 8 insertions(+), 3 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich