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2e0ca4718b
From this release, it is permitted to create shared memory blocks tagged as large for faster accesses for a size compatible with otherwise we fallback to a classic creation. Close GH-8037
137 lines
4.7 KiB
C
137 lines
4.7 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend OPcache |
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+----------------------------------------------------------------------+
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| Copyright (c) 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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| https://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@php.net> |
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| Zeev Suraski <zeev@php.net> |
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| Stanislav Malyshev <stas@zend.com> |
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| Dmitry Stogov <dmitry@php.net> |
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+----------------------------------------------------------------------+
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*/
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#include "zend_shared_alloc.h"
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#ifdef USE_SHM_OPEN
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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 <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <stdlib.h>
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typedef struct {
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zend_shared_segment common;
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int shm_fd;
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} zend_shared_segment_posix;
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static int create_segments(size_t requested_size, zend_shared_segment_posix ***shared_segments_p, int *shared_segments_count, const char **error_in)
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{
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zend_shared_segment_posix *shared_segment;
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char shared_segment_name[sizeof("/ZendAccelerator.") + 20];
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int shared_segment_flags = O_RDWR|O_CREAT|O_TRUNC;
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mode_t shared_segment_mode = 0600;
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#if defined(HAVE_SHM_CREATE_LARGEPAGE)
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/**
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* architectures have 3 entries max and we are interested
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* from the second offset minimum to be worthy creating
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* a special shared segment tagged as 'large'.
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* only then amd64/i386/arm64 and perharps risc64*
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* archs are on interest here.
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*/
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size_t i, shared_segment_sizes = 0, shared_segment_lg_index = 0;
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size_t shared_segment_sindexes[3] = {0};
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const size_t entries = sizeof(shared_segment_sindexes) / sizeof(shared_segment_sindexes[0]);
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shared_segment_sizes = getpagesizes(shared_segment_sindexes, entries);
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if (shared_segment_sizes > 0) {
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for (i = shared_segment_sizes - 1; i >= 0; i --) {
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if (shared_segment_sindexes[i] != 0 &&
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!(requested_size % shared_segment_sindexes[i])) {
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shared_segment_lg_index = i;
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break;
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}
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}
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}
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#endif
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*shared_segments_count = 1;
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*shared_segments_p = (zend_shared_segment_posix **) calloc(1, sizeof(zend_shared_segment_posix) + 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_posix *)((char *)(*shared_segments_p) + sizeof(void *));
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(*shared_segments_p)[0] = shared_segment;
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sprintf(shared_segment_name, "/ZendAccelerator.%d", getpid());
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#if defined(HAVE_SHM_CREATE_LARGEPAGE)
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if (shared_segment_lg_index > 0) {
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shared_segment->shm_fd = shm_create_largepage(shared_segment_name, shared_segment_flags, shared_segment_lg_index, SHM_LARGEPAGE_ALLOC_DEFAULT, shared_segment_mode);
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if (shared_segment->shm_fd != -1) {
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goto truncate_segment;
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}
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}
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#endif
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shared_segment->shm_fd = shm_open(shared_segment_name, shared_segment_flags, shared_segment_mode);
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if (shared_segment->shm_fd == -1) {
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*error_in = "shm_open";
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return ALLOC_FAILURE;
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}
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#if defined(HAVE_SHM_CREATE_LARGEPAGE)
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truncate_segment:
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#endif
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if (ftruncate(shared_segment->shm_fd, requested_size) != 0) {
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*error_in = "ftruncate";
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shm_unlink(shared_segment_name);
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return ALLOC_FAILURE;
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}
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shared_segment->common.p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED, shared_segment->shm_fd, 0);
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if (shared_segment->common.p == MAP_FAILED) {
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*error_in = "mmap";
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shm_unlink(shared_segment_name);
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return ALLOC_FAILURE;
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}
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shm_unlink(shared_segment_name);
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shared_segment->common.pos = 0;
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shared_segment->common.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_posix *shared_segment)
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{
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munmap(shared_segment->common.p, shared_segment->common.size);
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close(shared_segment->shm_fd);
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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_posix);
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}
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const zend_shared_memory_handlers zend_alloc_posix_handlers = {
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(create_segments_t)create_segments,
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(detach_segment_t)detach_segment,
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segment_type_size
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};
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#endif /* USE_SHM_OPEN */
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