linux-kernel - Re: [PATCH RESEND v6 2/8] blk-throttle: prevent overflow while calculating wait time

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Date:   Thu, 28 Jul 2022 18:23:41 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Tejun Heo <tj@...nel.org>, 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, yi.zhang@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH RESEND v6 2/8] blk-throttle: prevent overflow while
 calculating wait time

在 2022/07/28 2:28, Tejun Heo 写道:
> On Fri, Jul 01, 2022 at 05:34:35PM +0800, Yu Kuai wrote:
>> From: Yu Kuai <yukuai3@...wei.com>
>>
>> In tg_with_in_bps_limit(), 'bps_limit * jiffy_elapsed_rnd' might
>> overflow. FIx the problem by calling mul_u64_u64_div_u64() instead.
>>
>> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> 
> Acked-by: Tejun Heo <tj@...nel.org>
> 
> BTW, have you observed this happening or is it from just reviewing the code?

It's just from code review.

Thanks.
> 
> Thanks.
>