1 /*
2 +----------------------------------------------------------------------+
3 | Zend OPcache |
4 +----------------------------------------------------------------------+
5 | Copyright (c) The PHP Group |
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 +----------------------------------------------------------------------+
15 | Authors: Andi Gutmans <andi@php.net> |
16 | Zeev Suraski <zeev@php.net> |
17 | Stanislav Malyshev <stas@zend.com> |
18 | Dmitry Stogov <dmitry@php.net> |
19 +----------------------------------------------------------------------+
20 */
21
22 #include "zend_shared_alloc.h"
23
24 #ifdef USE_MMAP
25
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <sys/mman.h>
31
32 #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
33 # define MAP_ANONYMOUS MAP_ANON
34 #endif
35 #if defined(MAP_ALIGNED_SUPER)
36 # define MAP_HUGETLB MAP_ALIGNED_SUPER
37 #endif
38
create_segments(size_t requested_size,zend_shared_segment *** shared_segments_p,int * shared_segments_count,char ** error_in)39 static int create_segments(size_t requested_size, zend_shared_segment ***shared_segments_p, int *shared_segments_count, char **error_in)
40 {
41 zend_shared_segment *shared_segment;
42
43 *shared_segments_count = 1;
44 *shared_segments_p = (zend_shared_segment **) calloc(1, sizeof(zend_shared_segment) + sizeof(void *));
45 if (!*shared_segments_p) {
46 *error_in = "calloc";
47 return ALLOC_FAILURE;
48 }
49 shared_segment = (zend_shared_segment *)((char *)(*shared_segments_p) + sizeof(void *));
50 (*shared_segments_p)[0] = shared_segment;
51
52 #ifdef MAP_HUGETLB
53 /* Try to allocate huge pages first to reduce dTLB misses.
54 * OSes has to be configured properly
55 * on Linux
56 * (e.g. https://wiki.debian.org/Hugepages#Enabling_HugeTlbPage)
57 * You may verify huge page usage with the following command:
58 * `grep "Huge" /proc/meminfo`
59 * on FreeBSD
60 * sysctl vm.pmap.pg_ps_enabled entry
61 * (boot time config only, but enabled by default on most arches).
62 */
63 shared_segment->p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS|MAP_HUGETLB, -1, 0);
64 if (shared_segment->p != MAP_FAILED) {
65 shared_segment->pos = 0;
66 shared_segment->size = requested_size;
67
68 return ALLOC_SUCCESS;
69 }
70 #endif
71
72 shared_segment->p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
73 if (shared_segment->p == MAP_FAILED) {
74 *error_in = "mmap";
75 return ALLOC_FAILURE;
76 }
77
78 shared_segment->pos = 0;
79 shared_segment->size = requested_size;
80
81 return ALLOC_SUCCESS;
82 }
83
detach_segment(zend_shared_segment * shared_segment)84 static int detach_segment(zend_shared_segment *shared_segment)
85 {
86 munmap(shared_segment->p, shared_segment->size);
87 return 0;
88 }
89
segment_type_size(void)90 static size_t segment_type_size(void)
91 {
92 return sizeof(zend_shared_segment);
93 }
94
95 zend_shared_memory_handlers zend_alloc_mmap_handlers = {
96 create_segments,
97 detach_segment,
98 segment_type_size
99 };
100
101 #endif /* USE_MMAP */
102
