linux-kernel - Re: [PATCH 1/5] ftrace: Synchronize variable setting with breakpoints

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Message-ID: <20120601004551.GA16429@infradead.org>
Date:	Thu, 31 May 2012 21:45:51 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"H. Peter Anvin" <hpa@...or.com>, Dave Jones <davej@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/5] ftrace: Synchronize variable setting with breakpoints

Em Thu, May 31, 2012 at 10:26:09PM +0200, Peter Zijlstra escreveu:
> > Hmm, this brings up another question. By default, perf does not allow
> > users to profile trace_events correct? IOW, perf does not let
> > unprivileged users call text_poke()? I just tried it and got the:
> > 
> > $ ~/bin/perf record -e sched:sched_switch sleep 1
> > Permission error - are you root?
> > Consider tweaking /proc/sys/kernel/perf_event_paranoid:
> >  -1 - Not paranoid at all
> >   0 - Disallow raw tracepoint access for unpriv
> >   1 - Disallow cpu events for unpriv
> >   2 - Disallow kernel profiling for unpriv
> 
> It would, except tools/perf does stupid, its unconditionally adding
> PERF_SAMPLE_RAW (even for non-sampling events), which is the bit that
> requires privs.

Looserland, bah, I'll check that, thanks.

- Arnaldo
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