mirror of
https://github.com/php/php-src.git
synced 2024-09-21 18:07:23 +00:00
130 lines
4.5 KiB
C
130 lines
4.5 KiB
C
/*
|
|
+----------------------------------------------------------------------+
|
|
| Zend OPcache |
|
|
+----------------------------------------------------------------------+
|
|
| Copyright (c) The PHP Group |
|
|
+----------------------------------------------------------------------+
|
|
| This source file is subject to version 3.01 of the PHP license, |
|
|
| that is bundled with this package in the file LICENSE, and is |
|
|
| available through the world-wide-web at the following url: |
|
|
| http://www.php.net/license/3_01.txt |
|
|
| If you did not receive a copy of the PHP license and are unable to |
|
|
| obtain it through the world-wide-web, please send a note to |
|
|
| license@php.net so we can mail you a copy immediately. |
|
|
+----------------------------------------------------------------------+
|
|
| Authors: Andi Gutmans <andi@php.net> |
|
|
| Zeev Suraski <zeev@php.net> |
|
|
| Stanislav Malyshev <stas@zend.com> |
|
|
| Dmitry Stogov <dmitry@php.net> |
|
|
+----------------------------------------------------------------------+
|
|
*/
|
|
|
|
#include "zend_shared_alloc.h"
|
|
|
|
#ifdef USE_MMAP
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/mman.h>
|
|
|
|
#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
|
|
# define MAP_ANONYMOUS MAP_ANON
|
|
#endif
|
|
#if defined(MAP_ALIGNED_SUPER)
|
|
# define MAP_HUGETLB MAP_ALIGNED_SUPER
|
|
#endif
|
|
|
|
static int create_segments(size_t requested_size, zend_shared_segment ***shared_segments_p, int *shared_segments_count, char **error_in)
|
|
{
|
|
zend_shared_segment *shared_segment;
|
|
void *p;
|
|
#ifdef MAP_HUGETLB
|
|
size_t huge_page_size = 2 * 1024 * 1024;
|
|
|
|
/* Try to allocate huge pages first to reduce dTLB misses.
|
|
* OSes has to be configured properly
|
|
* on Linux
|
|
* (e.g. https://wiki.debian.org/Hugepages#Enabling_HugeTlbPage)
|
|
* You may verify huge page usage with the following command:
|
|
* `grep "Huge" /proc/meminfo`
|
|
* on FreeBSD
|
|
* sysctl vm.pmap.pg_ps_enabled entry
|
|
* (boot time config only, but enabled by default on most arches).
|
|
*/
|
|
if (requested_size >= huge_page_size && requested_size % huge_page_size == 0) {
|
|
# if defined(__x86_64__) && defined(MAP_32BIT)
|
|
/* to got HUGE PAGES in low 32-bit address we have to reserve address
|
|
space and then remap it using MAP_HUGETLB */
|
|
|
|
p = mmap(NULL, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS|MAP_32BIT, -1, 0);
|
|
if (p != MAP_FAILED) {
|
|
munmap(p, requested_size);
|
|
p = (void*)(ZEND_MM_ALIGNED_SIZE_EX((ptrdiff_t)p, huge_page_size));
|
|
p = mmap(p, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS|MAP_32BIT|MAP_HUGETLB|MAP_FIXED, -1, 0);
|
|
if (p != MAP_FAILED) {
|
|
goto success;
|
|
} else {
|
|
p = mmap(NULL, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS|MAP_32BIT, -1, 0);
|
|
if (p != MAP_FAILED) {
|
|
goto success;
|
|
}
|
|
}
|
|
}
|
|
# endif
|
|
p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS|MAP_HUGETLB, -1, 0);
|
|
if (p != MAP_FAILED) {
|
|
goto success;
|
|
}
|
|
}
|
|
#elif defined(PREFER_MAP_32BIT) && defined(__x86_64__) && defined(MAP_32BIT)
|
|
p = mmap(NULL, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS|MAP_32BIT, -1, 0);
|
|
if (p != MAP_FAILED) {
|
|
goto success;
|
|
}
|
|
#endif
|
|
|
|
p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
|
|
if (p == MAP_FAILED) {
|
|
*error_in = "mmap";
|
|
return ALLOC_FAILURE;
|
|
}
|
|
|
|
success:
|
|
*shared_segments_count = 1;
|
|
*shared_segments_p = (zend_shared_segment **) calloc(1, sizeof(zend_shared_segment) + sizeof(void *));
|
|
if (!*shared_segments_p) {
|
|
munmap(p, requested_size);
|
|
*error_in = "calloc";
|
|
return ALLOC_FAILURE;
|
|
}
|
|
shared_segment = (zend_shared_segment *)((char *)(*shared_segments_p) + sizeof(void *));
|
|
(*shared_segments_p)[0] = shared_segment;
|
|
|
|
shared_segment->p = p;
|
|
shared_segment->pos = 0;
|
|
shared_segment->size = requested_size;
|
|
|
|
return ALLOC_SUCCESS;
|
|
}
|
|
|
|
static int detach_segment(zend_shared_segment *shared_segment)
|
|
{
|
|
munmap(shared_segment->p, shared_segment->size);
|
|
return 0;
|
|
}
|
|
|
|
static size_t segment_type_size(void)
|
|
{
|
|
return sizeof(zend_shared_segment);
|
|
}
|
|
|
|
zend_shared_memory_handlers zend_alloc_mmap_handlers = {
|
|
create_segments,
|
|
detach_segment,
|
|
segment_type_size
|
|
};
|
|
|
|
#endif /* USE_MMAP */
|