linux-kernel - Re: [PATCH v3 3/5] block, bfq: don't disable wbt if CONFIG_BFQ_GROUP

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Message-ID: <Yy10vjnxAvca8Ee1@infradead.org>
Date:   Fri, 23 Sep 2022 01:56:30 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Yu Kuai <yukuai3@...wei.com>
Cc:     jack@...e.cz, paolo.valente@...aro.org, axboe@...nel.dk,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai1@...weicloud.com, yi.zhang@...wei.com
Subject: Re: [PATCH v3 3/5] block, bfq: don't disable wbt if
 CONFIG_BFQ_GROUP_IOSCHED is disabled

On Thu, Sep 22, 2022 at 07:35:56PM +0800, Yu Kuai wrote:
> wbt and bfq should work just fine if CONFIG_BFQ_GROUP_IOSCHED is disabled.

Umm, wouldn't this be something decided at runtime, that is not
if CONFIG_BFQ_GROUP_IOSCHED is enable/disable in the kernel build
if the hierarchical cgroup based scheduling is actually used for a
given device?