for i := start; i >= min; i-- {
		// Skip over chunks.
		if !s.chunks[i].load().shouldScavenge(gen, force) {
			continue
		}
		// We're still scavenging this chunk.
		if i == start {
			return i, chunkPageIndex(searchAddr)
		}
		// Try to reduce searchAddr to newSearchAddr.
		newSearchAddr := chunkBase(i) + pallocChunkBytes - pageSize
		if marked {
			// Attempt to be the first one to decrease the searchAddr