linux-kernel - Re: [PATCH] tracing/function-graph-tracer: don't profile branches on graph tracer

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Message-ID: <20090322170333.GA6936@elte.hu>
Date:	Sun, 22 Mar 2009 18:03:33 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing/function-graph-tracer: don't profile branches
	on graph tracer


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> Impact: fix slow tracing
> 
> The core kernel tracing is protected against soft branch 
> profiling, but not the x86 ftrace arch part. Let's fix it.

right now we should simply disable the branch profiler if any 
function tracing variant is enabled.

We should probably mark it CONFIG_BROKEN until it's properly 
per-cpu-ized.

	Ingo
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