linux-kernel - Re: [PATCH v8 1/4] blk-throttle: fix that io throttle can only work for single bio

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Date:   Thu, 25 Aug 2022 08:15:47 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     axboe@...nel.dk, ming.lei@...hat.com, mkoutny@...e.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, yi.zhang@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH v8 1/4] blk-throttle: fix that io throttle can only work
 for single bio

On Wed, Aug 24, 2022 at 09:15:32AM +0800, Yu Kuai wrote:
> This patch actually set two flags when bio is throttled and
> dispatched, and only iops flag is cleared after the original bio is
> split. If only one flag can be used, the way that I come up with is
> that let iops limit become default, which means bio is always counted
> for iops limit each time blk_throtl_bio() is called. I'm not quite
> sure yet if iops limit can be counted excessively this way in some
> special scenario...

I don't think we have a path where we clone and re-submit other than
splitting. What do you think about renaming the flag to BIO_BPS_THROTTLED
and just assuming that IOPS is always applied?

Thanks.

-- 
tejun