linux-kernel - Re: [PATCH 1/2] perf bench: port memcpy

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Date:	Sat, 30 Oct 2010 21:21:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	linux-kernel@...r.kernel.org, h.mitake@...il.com,
	"Ma Ling:" <ling.ma@...el.com>, Zhao Yakui <yakui.zhao@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 1/2] perf bench: port memcpy_64.S to perf bench


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Sat, 2010-10-30 at 01:01 +0900, Hitoshi Mitake wrote:
> > This patch ports arch/x86/lib/memcpy_64.S to "perf bench mem".
> > When PERF_BENCH is defined at preprocessor level,
> > memcpy_64.S is preprocessed to includable form from the sources
> > under tools/perf for benchmarking programs.
> > 
> > Signed-off-by: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
> > Cc: Ma Ling: <ling.ma@...el.com>
> > Cc: Zhao Yakui <yakui.zhao@...el.com>
> > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> > Cc: Paul Mackerras <paulus@...ba.org>
> > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: H. Peter Anvin <hpa@...or.com>
> > ---
> >  arch/x86/lib/memcpy_64.S |   30 ++++++++++++++++++++++++++++++
> >  1 files changed, 30 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/x86/lib/memcpy_64.S b/arch/x86/lib/memcpy_64.S
> > index 75ef61e..72c6dfe 100644
> > --- a/arch/x86/lib/memcpy_64.S
> > +++ b/arch/x86/lib/memcpy_64.S
> > @@ -1,10 +1,23 @@
> >  /* Copyright 2002 Andi Kleen */
> >  
> > +/*
> > + * perf bench adoption by Hitoshi Mitake
> > + * PERF_BENCH means that this file is included from
> > + * the source files under tools/perf/ for benchmark programs.
> > + *
> > + * You don't have to care about PERF_BENCH when
> > + * you are working on the kernel.
> > + */
> > +
> > +#ifndef PERF_BENCH
> 
> I don't like littering the actual kernel code with tools/perf/
> ifdeffery..


Yeah - could we somehow accept that file into a perf build as-is?

Thanks,

	Ingo
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