var runtime.freemark

5 uses

	runtime (current package)
		heapdump.go#L483: var freemark [pageSize / 8]bool
		heapdump.go#L496: 		if n > uintptr(len(freemark)) {
		heapdump.go#L502: 				freemark[freeIndex] = true
		heapdump.go#L507: 			if freemark[j] {
		heapdump.go#L508: 				freemark[j] = false