On 05/20/10 13:10, Avi Kivity wrote: > On 05/20/2010 02:05 PM, Stefan Hajnoczi wrote: >> Jes, you're right, something like "perf stat -e kvm:* --start" and >> "perf stat --stop" would be more usable for system-wide monitoring. I >> wonder if it is possible to support this or whether the perf process >> needs to periodically accumulate the counters (i.e. babysit the kernel >> infrastructure)? >> > > perf needs to be running to pull data out of the kernel (and since > profiling is tied to an fd life cycle). > > What's wrong with starting perf after the warm-up period and stopping it > before it's done? It's pretty hard to script. I have scripts that do 'read_stats() ; run_test() ; read_stats() ; calc_average()' Autotest would like to do this kinda stuff too. Jes -- 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
