linux-kernel - Re: [LKP] [fs] b6509f6a8c: will-it-scale.per_thread

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Date:   Tue, 13 Oct 2020 09:47:30 +0800
From:   Xing Zhengjun <zhengjun.xing@...ux.intel.com>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     kernel test robot <rong.a.chen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [LKP] [fs] b6509f6a8c: will-it-scale.per_thread_ops -12.6%
 regression



On 10/12/2020 4:18 PM, Mel Gorman wrote:
> On Mon, Oct 12, 2020 at 02:20:26PM +0800, Xing Zhengjun wrote:
>> Hi Mel,
>>
>>     It is a revert commit caused the regression, Do you have a plan to fix
>> it? Thanks. I re-test it in v5.9-rc8, the regression still existed.
>>
> 
> The revert caused a *performance* regression but the original
> performance gain caused a functional failure. The overall performance
> should be unchanged. I have not revisited the topic since.
>
Thanks for the explanation. We will stop tracking it.

-- 
Zhengjun Xing