On Mon, Oct 22, 2012 at 3:53 PM, Andi Kleen <a...@linux.intel.com> wrote: > On Mon, Oct 22, 2012 at 03:20:51PM +0200, Stephane Eranian wrote: >> This patch adds the x modifier for events. It allows users to >> request exclusive PMU access (attr->exclusive): >> >> perf stat -e cycles:x ...... >> or >> perf stat -e cpu/cycles/x .... >> >> Exclusive mode is a feature of perf_events which was not yet >> supported by the perf tool. Some events may require exclusive >> PMU access (like on Intel SandyBridge). > > You probably should add it also to be readable from sysfs > Not sure I understand what you mean here.
x is not a HW property, this is a perf_event feature. It should NOT be exposed in /sys/device/cpu/format/. But maybe you're talking about a generic event exports in /sys/device/cpu/events. But why would I expose prec_dist there. And under what name? > (like I did with precise in my haswell patchkit) > > Then the SNB version of instructions-p can just force this > without the user having to do anything special. > > -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
