On Wed, 2011-05-11 at 11:55 -0400, Avi Kivity wrote: > - counters that have PMI (interrupt) enabled stop counting after the > interrupt is signalled. This is because we need one-shot samples > that keep counting, which perf doesn't support yet You'll have to reprogram the thing anyway, since not all hardware has the same counter width: [ 0.046996] Performance Events: AMD PMU driver. [ 0.048998] ... bit width: 48 vs [ 0.026998] Performance Events: PEBS fmt0+, Core2 events, Intel PMU driver. [ 0.026998] ... bit width: 40 simply letting the thing run will not behave in a consistent fashion. Or are you going to assume all software will properly read the cpuid leaf and not assume bit width? Also, I can't seem to locate where you fill that cpuid-leaf, kvm_pmu_cpuid_update() seems to read the entry, not write it. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
