linux-kernel - Re: [PATCH 7/9] ftrace, perf: Add support to use function tracepoint in perf

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Message-ID: <1322511189.17003.22.camel@frodo>
Date:	Mon, 28 Nov 2011 15:13:09 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, fweisbec@...il.com, mingo@...hat.com,
	paulus@...ba.org, acme@...stprotocols.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] ftrace, perf: Add support to use function
 tracepoint in perf

On Mon, 2011-11-28 at 21:03 +0100, Peter Zijlstra wrote:
> On Mon, 2011-11-28 at 14:58 -0500, Steven Rostedt wrote:
> > >   perf stat -e ftrace:function ls
> > 
> > Question. This is a root only command, correct? Otherwise, we are
> > allowing any user to create a large performance impact to the system. 
> 
> Typically not, although I haven't looked at Jiri's implementation of the
> function tracepoint.
> 

I would not allow function tracing for non root users. It's just way too
invasive to let such a thing happen.

-- Steve



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