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Date: Tue, 21 Apr 2009 11:51:07 -0400
From: Mathieu Desnoyers <compudj@krystal.dyndns.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
       Steven Rostedt <rostedt@goodmis.org>, linux-kernel@vger.kernel.org,
       Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>,
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       Lai Jiangshan <laijs@cn.fujitsu.com>, Zhaolei <zhaolei@cn.fujitsu.com>,
       Li Zefan <lizf@cn.fujitsu.com>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Masami Hiramatsu <mhiramat@redhat.com>,
       "Frank Ch. Eigler" <fche@elastic.org>, Tom Zanussi <tzanussi@gmail.com>,
       Jiaying Zhang <jiayingz@google.com>, Michael Rubin <mrubin@google.com>,
       Martin Bligh <mbligh@google.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Neil Horman <nhorman@tuxdriver.com>,
       Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>,
       Pekka@firstfloor.org
Subject: Re: [PATCH 2/8] tracing: create automated trace defines
Message-ID: <20090421155106.GE3792@Krystal>
References: <20090414172337.280621613@goodmis.org> <20090414172640.796858018@goodmis.org> <49E51FC1.8090306@goop.org> <20090415014548.GA7984@Krystal> <49E6065B.7080409@goop.org> <20090416023456.GC22378@Krystal> <49E69E76.9030608@goop.org> <20090416234410.GA20513@Krystal> <87zlebpzmk.fsf@basil.nowhere.org>
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* Andi Kleen (andi@firstfloor.org) wrote:
> Mathieu Desnoyers <compudj@krystal.dyndns.org> writes:
> 
> > Given how slow function calls are, at least on x86,
> 
> That was with frame pointers right? Frame pointers tend to make
> function calls slow.
> 

Looking at my .config, CONFIG_FRAME_POINTER is disabled here. So we
should probably expect an even worse performance impact if we enable
them.

Mathieu


> -Andi
> -- 
> ak@linux.intel.com -- Speaking for myself only.
> 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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