linux-kernel - Re: [PATCH 1/7] perf: Enable function tracing for perf core

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Message-ID: <20120908130646.GA2122@somewhere.redhat.com>
Date:	Sat, 8 Sep 2012 15:06:50 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/7] perf: Enable function tracing for perf core

On Sat, Sep 08, 2012 at 07:55:16AM -0400, Steven Rostedt wrote:
> According to Steven R. there is no reason left to not support
> function tracing for the perf core. This makes it easier to debug
> perf.
> 
> Don't remove -pg for the x86 and generic perf core.

Actually, perf can use function tracing. A good reason for disabling
function tracing in perf is to avoid the overhead of recursive function
tracing, even though we are protected against tracing re-entrancy, this
still result in some overhead.
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