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

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Message-ID: <1594027500.30360.32.camel@mtkswgap22>
Date:   Mon, 6 Jul 2020 17:25:00 +0800
From:   Chinwen Chang <chinwen.chang@...iatek.com>
To:     Haiyan Song <haiyanx.song@...el.com>
CC:     Laurent Dufour <ldufour@...ux.ibm.com>,
        <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>,
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        Tim Chen <tim.c.chen@...ux.intel.com>,
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Subject: Re: [PATCH v12 00/31] Speculative page faults

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


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

Thanks.
Chinwen Chang