Enabling it for each run_worker call will invoke ioctl PERF_EVENT_IOC_ENABLE in parallel to other workers running and this may skew the results. Test: perf_simple_query Signed-off-by: Benny Halevy <bhalevy@scylladb.com> Message-Id: <20210514130542.301168-1-bhalevy@scylladb.com>