linux-kernel - Re: [PATCH v7 9/9] blk-throttle: clean up flag 'THROTL_TG

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Message-ID: <Yvv6kk/RD5LT+3dk@slm.duckdns.org>
Date:   Tue, 16 Aug 2022 10:14:10 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     mkoutny@...e.com, axboe@...nel.dk, ming.lei@...hat.com,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yukuai3@...wei.com,
        yi.zhang@...wei.com
Subject: Re: [PATCH v7 9/9] blk-throttle: clean up flag 'THROTL_TG_PENDING'

On Tue, Aug 02, 2022 at 10:04:15PM +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> All related operations are inside 'queue_lock', there is no need to use
> the flag, we only need to make sure throtl_enqueue_tg() is called when
> the first bio is throttled, and throtl_dequeue_tg() is called when the
> last throttled bio is dispatched. There are no functional changes in
> this patch.

I don't know whether this is better or not. It's minutely less lines of code
but also makes the code a bit more fragile. I'm ambivalent. At any rate,
please move these trivial patches to the head of the series or post them
separately.

Thanks.

-- 
tejun