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|
/*
+----------------------------------------------------------------------+
| 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>
#ifdef __APPLE__
#include <mach/vm_statistics.h>
#endif
#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;
int flags = PROT_READ | PROT_WRITE, fd = -1;
void *p;
#ifdef PROT_MPROTECT
flags |= PROT_MPROTECT(PROT_EXEC);
#endif
#ifdef VM_MAKE_TAG
/* allows tracking segments via tools such as vmmap */
fd = VM_MAKE_TAG(251U);
#endif
#ifdef PROT_MAX
flags |= PROT_MAX(PROT_READ | PROT_WRITE | PROT_EXEC);
#endif
#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, flags, MAP_SHARED|MAP_ANONYMOUS|MAP_32BIT, fd, 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, flags, MAP_SHARED|MAP_ANONYMOUS|MAP_32BIT|MAP_HUGETLB|MAP_FIXED, -1, 0);
if (p != MAP_FAILED) {
goto success;
} else {
p = mmap(NULL, requested_size, flags, MAP_SHARED|MAP_ANONYMOUS|MAP_32BIT, fd, 0);
if (p != MAP_FAILED) {
goto success;
}
}
}
# endif
p = mmap(0, requested_size, flags, MAP_SHARED|MAP_ANONYMOUS|MAP_HUGETLB, fd, 0);
if (p != MAP_FAILED) {
goto success;
}
}
#elif defined(PREFER_MAP_32BIT) && defined(__x86_64__) && defined(MAP_32BIT)
p = mmap(NULL, requested_size, flags, MAP_SHARED|MAP_ANONYMOUS|MAP_32BIT, fd, 0);
if (p != MAP_FAILED) {
goto success;
}
#endif
p = mmap(0, requested_size, flags, MAP_SHARED|MAP_ANONYMOUS, fd, 0);
if (p == MAP_FAILED) {
*error_in = "mmap";
return ALLOC_FAILURE;
}
success: ZEND_ATTRIBUTE_UNUSED;
*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 */
|
