linux-kernel - Re: 回复：[PATCH] perf: optimize clear page in Intel specified model with movq instruction

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Message-ID: <YWrSKeT+R2S/+udL@zn.tnic>
Date:   Sat, 16 Oct 2021 15:22:49 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     JY Ni <jiayu.ni@...ux.alibaba.com>
Cc:     Luming Yu <luming.yu@...il.com>,
        wujinhua <wujinhua@...ux.alibaba.com>, x86 <x86@...nel.org>,
        "zelin.deng" <zelin.deng@...ux.alibaba.com>,
        ak <ak@...ux.intel.com>, "luming.yu" <luming.yu@...el.com>,
        "fan.du" <fan.du@...el.com>,
        "artie.ding" <artie.ding@...ux.alibaba.com>,
        "tony.luck" <tony.luck@...el.com>, tglx <tglx@...utronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "pawan.kumar.gupta" <pawan.kumar.gupta@...ux.intel.com>,
        "fenghua.yu" <fenghua.yu@...el.com>, hpa <hpa@...or.com>,
        "ricardo.neri-calderon" <ricardo.neri-calderon@...ux.intel.com>,
        peterz <peterz@...radead.org>
Subject: Re: 回复：[PATCH] perf: optimize clear page in Intel specified model with movq instruction

On Sat, Oct 16, 2021 at 08:58:32PM +0800, JY Ni wrote:
> I rebased this patch on linux-next repo and measured the time of building a
> same kernel in original/add-movq-patch version on the same intel CPX server.

...

> delta = (*build_original_time* - *build_movq_time*) / (*build_movq_time*)
> 
> This set of data shows that movq-patch version has better performance than
> original version in most cases.

First of all, please do not top-post but put your answer under the
quoted text like everyone else.

Then, please explain how exactly you ran that measurement so that I can
try to reproduce it here too.

And just to make sure we're talking about the same thing: the patch in
question is this one:

https://lore.kernel.org/r/1631177151-53723-1-git-send-email-wujinhua@linux.alibaba.com

correct?

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette