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Define MADV_FREE on our own when needed.

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On x86 Linux, we define our own MADV_FREE if madvise(2) is available, but no
MADV_FREE is detected.  This allows the feature to be built in and enabled with
runtime detection.
This commit is contained in:
Qi Wang 2017-10-05 16:28:55 -07:00 • committed by Qi Wang
parent fc83de0384
commit 31ab38be5f
4 changed files with 23 additions and 1 deletions
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9
configure.ac
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@ -1824,6 +1824,15 @@ if test "x${je_cv_madvise}" = "xyes" ; then
], [je_cv_madv_free])
if test "x${je_cv_madv_free}" = "xyes" ; then
AC_DEFINE([JEMALLOC_PURGE_MADVISE_FREE], [ ])
elif test "x${je_cv_madvise}" = "xyes" ; then
case "${host_cpu}" in i686|x86_64)
case "${host}" in *-*-linux*)
AC_DEFINE([JEMALLOC_PURGE_MADVISE_FREE], [ ])
AC_DEFINE([JEMALLOC_DEFINE_MADVISE_FREE], [ ])
;;
esac
;;
esac
fi
dnl Check for madvise(..., MADV_DONTNEED).