linux-kernel - Re: [PATCH v7 8/9] blk-throttle: cleanup tg_update

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Message-ID: <Yvv5as5BVuqjw6PX@slm.duckdns.org>
Date:   Tue, 16 Aug 2022 10:09:14 -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 8/9] blk-throttle: cleanup tg_update_disptime()

On Tue, Aug 02, 2022 at 10:04:14PM +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> tg_update_disptime() only need to adjust postion for 'tg' in
> 'parent_sq', there is no need to call throtl_enqueue/dequeue_tg().
> 
> Save a little overhead in tg_update_disptime() and prepare to cleanup
> flag 'THROTL_TG_PENDING', there are no functional changes.

Does this actually help anything? Given that the heavy part of the operation
remains the same, this might not be much of an optimization. Is there even a
microbench that can show the difference?

Thanks.

-- 
tejun