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.
> + }
> +
> + return intel_pebs_aliases_ivb(event);
> }
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