return true
	}
	pinnerBits := span.getPinnerBits()
	// these pinnerBits might get unlinked by a concurrently running sweep, but
	// that's OK because gcBits don't get cleared until the following GC cycle
	// (nextMarkBitArenaEpoch)
	if pinnerBits == nil {
		return false
	}
	objIndex := span.objIndex(uintptr(ptr))
	pinState := pinnerBits.ofObject(objIndex)

	// scavenge for a bit.
	//
	// If the scavenger isn't already awake, wake it up. There's
	// definitely work for it to do at this point.
	scavenger.wake()

	nextMarkBitArenaEpoch()
}

func bgsweep(c chan int) {
	sweep.g = getg()

	lockInit(&sweep.lock, lockRankSweep)
	lock(&sweep.lock)
	sweep.parked = true
	c <- 1

// mark bits are repurposed as allocation bits when
// the span is swept.
func newAllocBits(nelems uintptr) *gcBits {
	return newMarkBits(nelems)
}

// nextMarkBitArenaEpoch establishes a new epoch for the arenas
// holding the mark bits. The arenas are named relative to the
// current GC cycle which is demarcated by the call to finishweep_m.
//
// All current spans have been swept.