pp := tl.mp.p.ptr()
	if pp.trace.maySweep {
		throw("double traceGCSweepStart")
	}
	pp.trace.maySweep, pp.trace.swept, pp.trace.reclaimed = true, 0, 0
}

// GCSweepSpan traces the sweep of a single span. If this is
// the first span swept since traceGCSweepStart was called, this
// will emit a GCSweepBegin event.
//
// This may be called outside a traceGCSweepStart/traceGCSweepDone

		print("mspan.sweep: state=", state, " sweepgen=", s.sweepgen, " mheap.sweepgen=", sweepgen, "\n")
		throw("mspan.sweep: bad span state")
	}

	trace := traceAcquire()
	if trace.ok() {
		trace.GCSweepSpan(s.npages * _PageSize)
		traceRelease(trace)
	}

	mheap_.pagesSwept.Add(int64(s.npages))

	spc := s.spanclass
	size := s.elemsize

	// The allocBits indicate which unmarked objects don't need to be

		n -= uintptr(len(inUse) * 8)
	}
	sweep.active.end(sl)
	trace := traceAcquire()
	if trace.ok() {
		unlock(&h.lock)
		// Account for pages scanned but not reclaimed.
		trace.GCSweepSpan((n0 - nFreed) * pageSize)
		traceRelease(trace)
		lock(&h.lock)
	}

	assertLockHeld(&h.lock) // Must be locked on return.
	return nFreed
}

String id=201
	data="runtime.traceLocker.GCMarkAssistStart"
String id=202
	data="/usr/local/google/home/mknyszek/work/go-1/src/runtime/trace2runtime.go"
String id=203
	data="runtime.traceLocker.GCSweepSpan"
String id=204
	data="runtime.(*sweepLocked).sweep"
String id=205
	data="net.(*netFD).Write"
String id=206
	data="net.(*conn).Write"
String id=207
	data="runtime.(*traceAdvancerState).start"

	data="runtime/trace.Start.func1"
String id=49
	data="/usr/local/google/home/mknyszek/work/go-1/src/runtime/trace/trace.go"
String id=50
	data="runtime.gcStart"
String id=51
	data="runtime.traceLocker.GCSweepSpan"
String id=52
	data="/usr/local/google/home/mknyszek/work/go-1/src/runtime/trace2runtime.go"
String id=53
	data="runtime.(*sweepLocked).sweep"
String id=54