PERF_RECORD_MISC_SWITCH_OUT_PREEMPT
PERF_RECORD_MISC_SWITCH_OUT_PREEMPT;
if (sample->misc & PERF_RECORD_MISC_SWITCH_OUT_PREEMPT)
(event->header.misc & PERF_RECORD_MISC_SWITCH_OUT_PREEMPT);
!(event->header.misc & PERF_RECORD_MISC_SWITCH_OUT_PREEMPT) ?
bool out_preempt = out && (event->header.misc & PERF_RECORD_MISC_SWITCH_OUT_PREEMPT);