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95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend OPcache |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2014 The PHP Group |
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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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| Authors: Andi Gutmans <andi@zend.com> |
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| Zeev Suraski <zeev@zend.com> |
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| Stanislav Malyshev <stas@zend.com> |
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| Dmitry Stogov <dmitry@zend.com> |
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+----------------------------------------------------------------------+
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*/
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#include "zend_shared_alloc.h"
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#ifdef USE_MMAP
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
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# define MAP_ANONYMOUS MAP_ANON
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#endif
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static int create_segments(size_t requested_size, zend_shared_segment ***shared_segments_p, int *shared_segments_count, char **error_in)
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{
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zend_shared_segment *shared_segment;
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*shared_segments_count = 1;
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*shared_segments_p = (zend_shared_segment **) calloc(1, sizeof(zend_shared_segment) + sizeof(void *));
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if (!*shared_segments_p) {
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*error_in = "calloc";
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return ALLOC_FAILURE;
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}
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shared_segment = (zend_shared_segment *)((char *)(*shared_segments_p) + sizeof(void *));
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(*shared_segments_p)[0] = shared_segment;
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#ifdef MAP_HUGETLB
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/* Try to allocate huge pages first to reduce dTLB misses.
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* OS has to be configured properly
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* (e.g. https://wiki.debian.org/Hugepages#Enabling_HugeTlbPage)
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* You may verify huge page usage with the following command:
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* `grep "Huge" /proc/meminfo`
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*/
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shared_segment->p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS|MAP_HUGETLB, -1, 0);
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if (shared_segment->p != MAP_FAILED) {
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shared_segment->pos = 0;
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shared_segment->size = requested_size;
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return ALLOC_SUCCESS;
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}
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#endif
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shared_segment->p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
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if (shared_segment->p == MAP_FAILED) {
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*error_in = "mmap";
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return ALLOC_FAILURE;
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}
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shared_segment->pos = 0;
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shared_segment->size = requested_size;
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return ALLOC_SUCCESS;
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}
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static int detach_segment(zend_shared_segment *shared_segment)
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{
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munmap(shared_segment->p, shared_segment->size);
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return 0;
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}
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static size_t segment_type_size(void)
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{
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return sizeof(zend_shared_segment);
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}
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zend_shared_memory_handlers zend_alloc_mmap_handlers = {
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create_segments,
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detach_segment,
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segment_type_size
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};
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#endif /* USE_MMAP */
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