linux-kernel - Re: [PATCH] blk-throttle: Fix incorrect display of io.max

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Date: Thu, 30 May 2024 06:41:34 -1000
From: Tejun Heo <tj@...nel.org>
To: Waiman Long <longman@...hat.com>
Cc: Jens Axboe <axboe@...nel.dk>, Josef Bacik <josef@...icpanda.com>,
	cgroups@...r.kernel.org, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dan Schatzberg <schatzberg.dan@...il.com>,
	Ming Lei <ming.lei@...hat.com>, Justin Forbes <jforbes@...hat.com>
Subject: Re: [PATCH] blk-throttle: Fix incorrect display of io.max

On Thu, May 30, 2024 at 09:45:47AM -0400, Waiman Long wrote:
> Commit bf20ab538c81 ("blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW")
> attempts to revert the code change introduced by commit cd5ab1b0fcb4
> ("blk-throttle: add .low interface").  However, it leaves behind the
> bps_conf[] and iops_conf[] fields in the throtl_grp structure which
> aren't set anywhere in the new blk-throttle.c code but are still being
> used by tg_prfill_limit() to display the limits in io.max. Now io.max
> always displays the following values if a block queue is used:
> 
> 	<m>:<n> rbps=0 wbps=0 riops=0 wiops=0
> 
> Fix this problem by removing bps_conf[] and iops_conf[] and use bps[]
> and iops[] instead to complete the revert.
> 
> Fixes: bf20ab538c81 ("blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW")
> Reported-by: Justin Forbes <jforbes@...hat.com>
> Closes: https://github.com/containers/podman/issues/22701#issuecomment-2120627789
> Signed-off-by: Waiman Long <longman@...hat.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun