linux-kernel - Re: [PATCH v2 00/15] x86, alternatives: Instruction padding and more robust JMPs

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Date:	Mon, 02 Mar 2015 23:51:17 +0900
From:	Hitoshi Mitake <mitake.hitoshi@...il.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	X86 ML <x86@...nel.org>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH v2 00/15] x86, alternatives: Instruction padding and more robust JMPs


Hi Borislav,

At Thu, 26 Feb 2015 19:13:38 +0100,
Borislav Petkov wrote:
> 
> Hi all,
> 
> So this alternatives patchset breaks perf bench mem, here are a couple
> of patches ontop, you guys tell me whether it makes sense. I wanted to
> make it run all memset/memcpy routines so here are a couple of patches
> which do this:
> 
> ./perf bench mem memset -l 20MB -r all
> # Running 'mem/memset' benchmark:
> Routine default (Default memset() provided by glibc)
> # Copying 20MB Bytes ...
> 
>        1.136000 GB/Sec
>        6.026304 GB/Sec (with prefault)
> Routine x86-64-unrolled (unrolled memset() in arch/x86/lib/memset_64.S)
> # Copying 20MB Bytes ...
> 
>        5.333493 GB/Sec
>        5.633473 GB/Sec (with prefault)
> Routine x86-64-stosq (movsq-based memset() in arch/x86/lib/memset_64.S)
> # Copying 20MB Bytes ...
> 
>        5.828484 GB/Sec
>        5.851183 GB/Sec (with prefault)
> Routine x86-64-stosb (movsb-based memset() in arch/x86/lib/memset_64.S)
> # Copying 20MB Bytes ...
> 
>        5.553384 GB/Sec
>        5.956465 GB/Sec (with prefault)
> 
> This way you can see all results by executing one command only with "-r
> all".
> 
> Patches coming as a reply to this message.

I'm not sure I'm a suitable person for reviewing your patch, but I
tested this patchset for perf bench with your latest (v2) patchset for
x86 alternatives. It looks good to me.
Reviewed-by: Hitoshi Mitake <mitake.hitoshi@....ntt.co.jp>

Thanks,
Hitoshi
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