linux-kernel - Re: Efficient x86 and x86

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Message-ID: <48A34260.3070506@redhat.com>
Date:	Wed, 13 Aug 2008 16:21:52 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Roland McGrath <roland@...hat.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	Clark Williams <williams@...hat.com>
Subject: Re: Efficient x86 and x86_64 NOP microbenchmarks

Andi Kleen wrote:
> On Wed, Aug 13, 2008 at 04:00:37PM -0400, Steven Rostedt wrote:
>   
>>> Now the numbers have shown that just by not using frame pointer (
>>> -pg right now implies frame pointer) you can get more benefit 
>>> than what you lose from using non optimal nops.
>>>  
>>>       
>> No, I can easily make a patch that does not use frame pointers but still 
>>     
>
> Not without patching gcc. Try it. The patch is not very difficult and i did
> it here, but it needs a patch. 
>   

OK, I admit you are right ;-)

I got the error message:

    gcc: -pg and -fomit-frame-pointer are incompatible

-- Steve

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