linux-kernel - Re: Efficient x86 and x86

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Message-ID: <48A32E77.2000505@qumranet.com>
Date:	Wed, 13 Aug 2008 21:56:55 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	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:
>> How would you deal with inlines?  Using debug information?
>>     
>
> -pg already ignores inlines, so they aren't even traced today.
>
> It pretty much has to, assume an inline gets spread out by
> the global optimizer over the rest of the function, where would
> the mcount calls be inserted?
>   

Good point.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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