// after a syscall, it must understand the P may have been
	// used by another M in the interim.
	_Psyscall

	// _Pgcstop means a P is halted for STW and owned by the M
	// that stopped the world. The M that stopped the world
	// continues to use its P, even in _Pgcstop. Transitioning
	// from _Prunning to _Pgcstop causes an M to release its P and
	// park.
	//
	// The P retains its run queue and startTheWorld will restart

	// serialized by the caller.
	trace.seqGC++
}

// STWStart traces a STWBegin event.
func (tl traceLocker) STWStart(reason stwReason) {
	// Although the current P may be in _Pgcstop here, we model the P as running during the STW. This deviates from the
	// runtime's state tracking, but it's more accurate and doesn't result in any loss of information.

	s.IdleTime += sched.idleTime.Load()

	// Compute userTime. We compute this indirectly as everything that's not the above.
	//
	// Since time spent in _Pgcstop is covered by gcPauseTime, and time spent in _Pidle
	// is covered by idleTime, what we're left with is time spent in _Prunning and _Psyscall,
	// the latter of which is fine because the P will either go idle or get used for something