2 +----------------------------------------------------------------------+
4 +----------------------------------------------------------------------+
5 | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com) |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
16 #ifndef incl_HPHP_MAPHUGE_H_
17 #define incl_HPHP_MAPHUGE_H_
19 #include <folly/portability/SysMman.h>
23 inline constexpr bool hugePagesSupported() {
25 // Kernels earlier than 3.2.28 may have bugs dealing with MADV_HUGEPAGE. The
26 // bug should've been fixed in production kernels now, so we no longer do
27 // run-time kernel version checks.
34 inline void hintHuge(void* mem
, size_t length
) {
36 if (hugePagesSupported()) {
37 madvise(mem
, length
, MADV_HUGEPAGE
);