diff options
Diffstat (limited to 'rts/m4/fp_large_address_space.m4')
| -rw-r--r-- | rts/m4/fp_large_address_space.m4 | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/rts/m4/fp_large_address_space.m4 b/rts/m4/fp_large_address_space.m4 new file mode 100644 index 0000000000..fd8a352a57 --- /dev/null +++ b/rts/m4/fp_large_address_space.m4 @@ -0,0 +1,57 @@ +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 +]) |