tree 7ba28f07b1ffe9622f101f0c9d0d814f05f9bdcd
parent f7ca1c9bc321feffe056f5d154c287f63e324020
author Jason Evans <jasone@canonware.com> 1479407091 -0800
committer Jason Evans <jasone@canonware.com> 1479407517 -0800

Refactor madvise(2) configuration.

Add feature tests for the MADV_FREE and MADV_DONTNEED flags to
madvise(2), so that MADV_FREE is detected and used for Linux kernel
versions 4.5 and newer.  Refactor pages_purge() so that on systems which
support both flags, MADV_FREE is preferred over MADV_DONTNEED.

This resolves #387.