On Fri, 2012-10-19 at 18:31 +0200, Stephane Eranian wrote:
> On Fri, Oct 19, 2012 at 6:27 PM, Peter Zijlstra <pet...@infradead.org> wrote:
> > On Fri, 2012-10-19 at 16:52 +0200, Stephane Eranian wrote:
> >> +static int intel_pebs_aliases_snb(struct perf_event *event)
> >> +{
> >> + u64 cfg = event->hw.config;
> >> + /*
> >> + * for INST_RETIRED.PREC_DIST to work correctly with PEBS, it must
> >> + * be measured alone on SNB (exclusive PMU access) as per Intel
> >> SDM.
> >> + */
> >> + if ((cfg & INTEL_ARCH_EVENT_MASK) == 0x01c0 &&
> >> !event->attr.exclusive) {
> >> + pr_info("perf: INST_RETIRED.PREC_DIST only works in
> >> exclusive mode\n");
> >> + return -EINVAL;
> >
> > 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 ;-)
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