linux-kernel - Re: [PATCH v12 00/31] Speculative page faults

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Date:   Mon, 6 Jul 2020 14:27:36 +0200
From:   Laurent Dufour <ldufour@...ux.ibm.com>
To:     Chinwen Chang <chinwen.chang@...iatek.com>,
        Haiyan Song <haiyanx.song@...el.com>
Cc:     akpm@...ux-foundation.org, mhocko@...nel.org, peterz@...radead.org,
        kirill@...temov.name, ak@...ux.intel.com, dave@...olabs.net,
        jack@...e.cz, Matthew Wilcox <willy@...radead.org>,
        aneesh.kumar@...ux.ibm.com, benh@...nel.crashing.org,
        mpe@...erman.id.au, paulus@...ba.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
        Will Deacon <will.deacon@....com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        sergey.senozhatsky.work@...il.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        kemi.wang@...el.com, Daniel Jordan <daniel.m.jordan@...cle.com>,
        David Rientjes <rientjes@...gle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Ganesh Mahendran <opensource.ganesh@...il.com>,
        Minchan Kim <minchan@...nel.org>,
        Punit Agrawal <punitagrawal@...il.com>,
        vinayak menon <vinayakm.list@...il.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        zhong jiang <zhongjiang@...wei.com>,
        Balbir Singh <bsingharora@...il.com>, sj38.park@...il.com,
        Michel Lespinasse <walken@...gle.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, npiggin@...il.com,
        paulmck@...ux.vnet.ibm.com, Tim Chen <tim.c.chen@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
        miles.chen@...iatek.com
Subject: Re: [PATCH v12 00/31] Speculative page faults

Le 06/07/2020 à 11:25, Chinwen Chang a écrit :
> On Thu, 2019-06-20 at 16:19 +0800, Haiyan Song wrote:
>> Hi Laurent,
>>
>> I downloaded your script and run it on Intel 2s skylake platform with spf-v12 patch
>> serials.
>>
>> Here attached the output results of this script.
>>
>> The following comparison result is statistics from the script outputs.
>>
>> a). Enable THP
>>                                              SPF_0          change       SPF_1
>> will-it-scale.page_fault2.per_thread_ops    2664190.8      -11.7%       2353637.6
>> will-it-scale.page_fault3.per_thread_ops    4480027.2      -14.7%       3819331.9
>>
>>
>> b). Disable THP
>>                                              SPF_0           change      SPF_1
>> will-it-scale.page_fault2.per_thread_ops    2653260.7       -10%        2385165.8
>> will-it-scale.page_fault3.per_thread_ops    4436330.1       -12.4%      3886734.2
>>
>>
>> Thanks,
>> Haiyan Song
>>
>>
>> On Fri, Jun 14, 2019 at 10:44:47AM +0200, Laurent Dufour wrote:
>>> Le 14/06/2019 à 10:37, Laurent Dufour a écrit :
>>>> Please find attached the script I run to get these numbers.
>>>> This would be nice if you could give it a try on your victim node and share the result.
>>>
>>> Sounds that the Intel mail fitering system doesn't like the attached shell script.
>>> Please find it there: https://gist.github.com/ldu4/a5cc1a93f293108ea387d43d5d5e7f44
>>>
>>> Thanks,
>>> Laurent.
>>>
> 
> Hi Laurent,
> 
> We merged SPF v11 and some patches from v12 into our platforms. After
> several experiments, we observed SPF has obvious improvements on the
> launch time of applications, especially for those high-TLP ones,
> 
> # launch time of applications(s):
> 
> package           version      w/ SPF      w/o SPF      improve(%)
> ------------------------------------------------------------------
> Baidu maps        10.13.3      0.887       0.98         9.49
> Taobao            8.4.0.35     1.227       1.293        5.10
> Meituan           9.12.401     1.107       1.543        28.26
> WeChat            7.0.3        2.353       2.68         12.20
> Honor of Kings    1.43.1.6     6.63        6.713        1.24

That's great news, thanks for reporting this!

> 
> By the way, we have verified our platforms with those patches and
> achieved the goal of mass production.

Another good news!
For my information, what is your targeted hardware?

Cheers,
Laurent.