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

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Date:   Fri, 26 Aug 2022 09:07:27 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Tejun Heo <tj@...nel.org>, 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

Hi, Tejun

在 2022/08/26 2:15, Tejun Heo 写道:
> 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?

Yes, I didn't found such path myself, this way sounds good. I'll send a
new version soon.

Thanks,
Kuai
> 
> Thanks.
>