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197007ab47
Previously a bitmap of buffers was repeatedly scanned to see which buffers still contain data. This process was needlessly wasting cycles (seen as a hotspot when profiled) and worse yet, the workload increased with the number of CPU cores (=> buffers used) to handle. The new implementation instead maintains a list of buffer indices that have to be handled. This list does not contain empty buffers, so each loop iteration performs some work, instead of just spinning in search for buffers to handle.