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Date: Wed, 13 Aug 2008 21:56:55 +0300
From: Avi Kivity <avi@qumranet.com>
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To: Andi Kleen <andi@firstfloor.org>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       Steven Rostedt <rostedt@goodmis.org>,
       Jeremy Fitzhardinge <jeremy@goop.org>,
       LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       David Miller <davem@davemloft.net>, Roland McGrath <roland@redhat.com>,
       Ulrich Drepper <drepper@redhat.com>,
       Rusty Russell <rusty@rustcorp.com.au>,
       Gregory Haskins <ghaskins@novell.com>,
       Arnaldo Carvalho de Melo <acme@redhat.com>,
       "Luis Claudio R. Goncalves" <lclaudio@uudg.org>,
       Clark Williams <williams@redhat.com>
Subject: Re: Efficient x86 and x86_64 NOP microbenchmarks
References: <alpine.DEB.1.10.0808081750590.16691@gandalf.stny.rr.com> <87tzdv2g05.fsf@basil.nowhere.org> <alpine.DEB.1.10.0808082030500.1396@gandalf.stny.rr.com> <489CE90D.1040902@goop.org> <alpine.LFD.1.10.0808081750060.3462@nehalem.linux-foundation.org> <alpine.DEB.1.10.0808082113090.3707@gandalf.stny.rr.com> <20080813175213.GA8679@Krystal> <alpine.LFD.1.10.0808131119290.3462@nehalem.linux-foundation.org> <20080813184142.GM1366@one.firstfloor.org> <48A32BCF.40300@qumranet.com> <20080813185110.GP1366@one.firstfloor.org>
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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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