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

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Message-ID: <a44417ad-ad5c-aab6-d656-badd4cfad60e@oracle.com>
Date:   Mon, 12 Oct 2020 20:01:12 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Xing Zhengjun <zhengjun.xing@...ux.intel.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 10/12/20 6:59 PM, Xing Zhengjun wrote:
> 
> 
> 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?
> 

My apologies.  I missed that you were not cc'ed on this thred:
https://lore.kernel.org/linux-mm/20200706202615.32111-1-mike.kravetz@oracle.com/

As mentioned, there will likely be another revision to the way locking is
handled.  The new scheme will try to consider performance as is done in
the above link.  I suggest you wait for next revision.  If you do not mind,
I will cc you when the new code is posted.
-- 
Mike Kravetz