On Thu, May 20, 2010 at 12:16 PM, Jes Sorensen <jes.soren...@redhat.com> wrote:
> On 05/20/10 13:10, Avi Kivity wrote:
>> 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 use the following. It ain't pretty:
#!/bin/bash
cleanup() {
trap - 2
kill -2 $sleep_pid
echo 0 >/sys/kernel/debug/tracing/events/kvm/enable
kill $cat_pid
}
perf stat -a -e 'kvm:*' sleep 1h >results/perf_stat 2>&1 &
sleep_pid=$(sleep 1 && pgrep -x -f "sleep 1h") # sleep 1 is to avoid
race with forked perf process
trap cleanup 2
echo 1 >/sys/kernel/debug/tracing/events/kvm/enable
cat /sys/kernel/debug/tracing/trace_pipe >results/trace &
cat_pid=$!
# ...do stuff here...
cleanup
Stefan
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