Jason Evans 7de92767c2 Fix mlockall()/madvise() interaction.
mlockall(2) can cause purging via madvise(2) to fail.  Fix purging code
to check whether madvise() succeeded, and base zeroed page metadata on
the result.

Reported by Olivier Lecomte.
2012-10-08 18:04:49 -07:00
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