linux-kernel - Re: [LKP] Re: [hugetlbfs] c0d0381ade: vm-scalability.throughput -33.4% regression

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Message-ID: <4c95b307-90b5-798f-34c1-000ea5331ebb@linux.intel.com>
Date:   Tue, 13 Oct 2020 09:59:08 +0800
From:   Xing Zhengjun <zhengjun.xing@...ux.intel.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>,
        kernel test robot <rong.a.chen@...el.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A.Shutemov" <kirill.shutemov@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Prakash Sangappa <prakash.sangappa@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [LKP] Re: [hugetlbfs] c0d0381ade: vm-scalability.throughput
 -33.4% regression



On 10/13/2020 1:40 AM, Mike Kravetz wrote:
> On 10/11/20 10:29 PM, Xing Zhengjun wrote:
>> Hi Mike,
>>
>>     I re-test it in v5.9-rc8, the regression still existed. It is almost the same as 34ae204f1851. Do you have time to look at it? Thanks.
>>
> 
> Thank you for testing.
> 
> Just curious, did you apply the series in this thread or just test v5.9-rc8?
> If just testing v5.9-rc8, no changes to this code were added after 34ae204f1851,
> so results being the same are expected.
> 

I just test v5.9-rc8. Where can I find the series patches you mentioned 
here? Or just wait for the next mainline release?


> There are some functional issues with this new hugetlb locking model that
> are currently being worked.  It is likely to result in significantly different
> code.  The performance issues discovered here will be taken into account with
> the new code.  However, as previously mentioned additional synchronization
> is required for functional correctness.  As a result, there will be some
> regression in this code.
> 

-- 
Zhengjun Xing