One-shot purge of dirty blocks per region. #358
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Start of yet another attempt at #270 .
Proposed
purgeDirtyBlocks(uint blocks)purges currently-dirtiest region, wholesale, until at leastblockscount of dirty blocks have been purged, or there are none remaining to purge. The actual count of purged dirty blocks (which may exceed the requested count) is returned.Needs:
madviseon already-clean space appears to have negligible cost; hence this proposed optimization.)MADV_DONTNEEDif we go with this?