// only the owner P can CAS it to a valid G.
	runnext guintptr

	// Available G's (status == Gdead)
	gFree struct {
		gList
		n int32
	}

	sudogcache []*sudog
	sudogbuf   [128]*sudog

	// Cache of mspan objects from the heap.
	mspancache struct {
		// We need an explicit length here because this field is used
		// in allocation codepaths where write barriers are not allowed,

	getg().m.p.ptr().timers.take(&pp.timers)

	// Flush p's write barrier buffer.
	if gcphase != _GCoff {
		wbBufFlush1(pp)
		pp.gcw.dispose()
	}
	for i := range pp.sudogbuf {
		pp.sudogbuf[i] = nil
	}
	pp.sudogcache = pp.sudogbuf[:0]
	pp.pinnerCache = nil
	for j := range pp.deferpoolbuf {
		pp.deferpoolbuf[j] = nil
	}
	pp.deferpool = pp.deferpoolbuf[:0]
	systemstack(func() {