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d00cb444a6
Overcommitted caches should only have commitments equal to the number of pages they actually contain, so we should decommit whenever pages are discarded. This changes the API of VMCache::Discard to return an ssize_t of the size of pages that were discarded (or a negative error on failure.) Nothing checked the return value besides things in VMCache itself, it appears; but it apparently never fails, so that's fine. Also add asserts to Commit() that the new commitment at least encompasses all pages the cache actually contains. |
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