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

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Date:	Tue, 29 Nov 2011 11:10:25 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, 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, Nov 28, 2011 at 03:13:09PM -0500, Steven Rostedt wrote:
> 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.

I believe it's for root only, I'll double check

jirka

> 
> -- Steve
> 
> 
> 
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