On Fri, Oct 19, 2012 at 5:49 PM, Andi Kleen <[email protected]> wrote: >> + /* >> + * 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; >> + } > > > Strictly you have to check for precise too, right? > Yes, the restriction is enforced only when PEBS is active and this is what I do based on where pebs_aliases() is called.
> -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
