mwilliams
5017e3c6cc
MADV_HUGEPAGE only works on anonymous, privately mapped memory. So re-map the hot part of the binary, and mark it huge. Reviewed By: @edwinsmith Differential Revision: D1061057
45 linhas
1.5 KiB
C++
45 linhas
1.5 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#include "hphp/util/maphuge.h"
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#include "hphp/util/kernel-version.h"
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#include <unistd.h>
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#include <sys/mman.h>
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namespace HPHP {
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void hintHuge(void* mem, size_t length) {
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#ifdef MADV_HUGEPAGE
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if (hugePagesSupported()) {
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madvise(mem, length, MADV_HUGEPAGE);
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}
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#endif
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}
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bool hugePagesSupported() {
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#ifdef MADV_HUGEPAGE
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static KernelVersion kv;
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// This kernel fixed a panic when using MADV_HUGEPAGE.
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static KernelVersion minKv("3.2.28-72_fbk12");
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return KernelVersion::cmp(kv, minKv);
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#else
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return false;
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#endif
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}
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}
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