/* +----------------------------------------------------------------------+ | Zend OPcache | +----------------------------------------------------------------------+ | Copyright (c) 1998-2017 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 | | Zeev Suraski | | Stanislav Malyshev | | Dmitry Stogov | +----------------------------------------------------------------------+ */ #include "zend_shared_alloc.h" #ifdef USE_MMAP #include #include #include #include #include #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS) # define MAP_ANONYMOUS MAP_ANON #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; *shared_segments_count = 1; *shared_segments_p = (zend_shared_segment **) calloc(1, sizeof(zend_shared_segment) + sizeof(void *)); if (!*shared_segments_p) { *error_in = "calloc"; return ALLOC_FAILURE; } shared_segment = (zend_shared_segment *)((char *)(*shared_segments_p) + sizeof(void *)); (*shared_segments_p)[0] = shared_segment; #ifdef MAP_HUGETLB /* Try to allocate huge pages first to reduce dTLB misses. * OS has to be configured properly * (e.g. https://wiki.debian.org/Hugepages#Enabling_HugeTlbPage) * You may verify huge page usage with the following command: * `grep "Huge" /proc/meminfo` */ shared_segment->p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS|MAP_HUGETLB, -1, 0); if (shared_segment->p != MAP_FAILED) { shared_segment->pos = 0; shared_segment->size = requested_size; return ALLOC_SUCCESS; } #endif shared_segment->p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0); if (shared_segment->p == MAP_FAILED) { *error_in = "mmap"; return ALLOC_FAILURE; } 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 */