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dnl large address space support (see rts/include/rts/storage/MBlock.h)
dnl
dnl Darwin has vm_allocate/vm_protect
dnl Linux has mmap(MAP_NORESERVE)/madv(MADV_DONTNEED)
dnl FreeBSD, Solaris and maybe other have MAP_NORESERVE/MADV_FREE
dnl (They also have MADV_DONTNEED, but it means something else!)
dnl
dnl Windows has VirtualAlloc MEM_RESERVE/MEM_COMMIT, however
dnl it counts page-table space as committed memory, and so quickly
dnl runs out of paging file when we have multiple processes reserving
dnl 1TB of address space, we get the following error:
dnl VirtualAlloc MEM_RESERVE 1099512676352 bytes failed: The paging file is too small for this operation to complete.
dnl
AC_DEFUN([FP_LARGE_ADDRESS_SPACE],
[
AC_ARG_ENABLE(large-address-space,
[AS_HELP_STRING([--enable-large-address-space],
[Use a single large address space on 64 bit systems (enabled by default on 64 bit platforms)])],
EnableLargeAddressSpace=$enableval,
EnableLargeAddressSpace=yes
)
use_large_address_space=no
if test "$ac_cv_sizeof_void_p" -eq 8 ; then
if test "x$EnableLargeAddressSpace" = "xyes" ; then
if test "$ghc_host_os" = "darwin" ; then
use_large_address_space=yes
elif test "$ghc_host_os" = "openbsd" ; then
# as of OpenBSD 5.8 (2015), OpenBSD does not support mmap with MAP_NORESERVE.
# The flag MAP_NORESERVE is supported for source compatibility reasons,
# but is completely ignored by OS mmap
use_large_address_space=no
elif test "$ghc_host_os" = "mingw32" ; then
# as of Windows 8.1/Server 2012 windows does no longer allocate the page
# tabe for reserved memory eagerly. So we are now free to use LAS there too.
use_large_address_space=yes
else
AC_CHECK_DECLS([MAP_NORESERVE, MADV_FREE, MADV_DONTNEED],[],[],
[
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
])
if test "$ac_cv_have_decl_MAP_NORESERVE" = "yes" &&
test "$ac_cv_have_decl_MADV_FREE" = "yes" ||
test "$ac_cv_have_decl_MADV_DONTNEED" = "yes" ; then
use_large_address_space=yes
fi
fi
fi
fi
if test "$use_large_address_space" = "yes" ; then
AC_DEFINE([USE_LARGE_ADDRESS_SPACE], [1], [Enable single heap address space support])
fi
])
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