linux-kernel - Re: [PATCH 2/2] perf: SNB exclusive PMU access for INST_RETIRED:PREC

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Date:	Fri, 19 Oct 2012 10:20:18 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 2/2] perf: SNB exclusive PMU access for
 INST_RETIRED:PREC_DIST

> > > This isn't limited to admin, right? So the above turns into a DoS on the
> > > console.
> > >
> > Ok, so how about a WARN_ON_ONCE() instead?
> 
> That should be fine I guess ;-)

imho there is need for a generic mechanism to return an error string
to the user program without such hacks.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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