+++ /dev/null
-/*
- +----------------------------------------------------------------------+
- | PHP Version 6 |
- +----------------------------------------------------------------------+
- | Copyright (c) 2006-2009 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: Georg Richter <georg@mysql.com> |
- | Andrey Hristov <andrey@mysql.com> |
- | Ulf Wendel <uwendel@mysql.com> |
- +----------------------------------------------------------------------+
-
-*/
-
-/* $Id$ */
-#include "php.h"
-#include "mysqlnd.h"
-#include "mysqlnd_priv.h"
-#include "mysqlnd_palloc.h"
-
-
-#define MYSQLND_SILENT
-#define MYSQLND_DONT_DUMP_STATS
-
-#define MYSQLND_ZVALS_MAX_CACHE 5000
-
-
-#if A0
-/* Caching zval allocator */
-zval * mysqlnd_alloc_get_zval(MYSQLND_ZVAL_CACHE * const cache);
-void mysqlnd_alloc_zval_ptr_dtor(zval **zv, MYSQLND_ZVAL_CACHE * const cache);
-MYSQLND_ZVAL_CACHE* mysqlnd_alloc_init_cache();
-MYSQLND_ZVAL_CACHE* mysqlnd_alloc_get_cache_reference(MYSQLND_ZVAL_CACHE *cache);
-void mysqlnd_alloc_free_cache_reference(MYSQLND_ZVAL_CACHE **cache);
-#endif
-
-
-/*
- The cache line is a big contiguous array of zval pointers.
- Because the CPU cache will cache starting from an address, and not
- before it, then we have to organize our structure according to this.
- Thus, if 'last_added' is valid pointer (not NULL) then last_added is
- increased. When zval is cached, if there is room, last_added is decreased
- and then the zval pointer will be assigned to it. This means that some
- positions may become hot points and stay in the cache.
- Imagine we have 5 pointers in a line
- 1. last_added = list_item->ptr_line + cache->max_items;
- 2. get_zval -> *last_added = NULL. Use MAKE_STD_ZVAL
- 3. get_zval -> *last_added = NULL. Use MAKE_STD_ZVAL
- 4. get_zval -> *last_added = NULL. Use MAKE_STD_ZVAL
- 0x0
- 0x0
- 0x0
- 0x0
- 0x0
- ---
- empty_position, always 0x0 <-- last_added
-
- 5. free_zval -> if (free_items++ != max_items) {// we can add more
- *(--last_added) = zval_ptr;
- }
- (memory addresses increase downwards)
- 0x0
- 0x0
- 0x0
- 0x0
- 0xA <-- last_added
- ---
- 0x0
-
- 6. free_zval -> if (free_items++ != max_items) {// we can add more
- *(--last_added) = zval_ptr;
- }
- 0x0
- 0x0
- 0x0
- 0xB <-- last_added
- 0xA
- ---
- 0x0
-
- 7. free_zval -> if (free_items++ != max_items) {// we can add more
- *(--last_added) = zval_ptr;
- }
- 0x0
- 0x0
- 0xC <-- last_added
- 0xB
- 0xA
- ---
- 0x0
-
- 8. get_zval -> *last_added != NULL. -> p = *last_added; *last_added++ = NULL;
- 0x0
- 0x0
- 0x0
- 0xB <-- last_added
- 0xA
- ---
- 0x0
-
- 9. get_zval -> *last_added != NULL. -> p = *last_added; *last_added++ = NULL;
- 0x0
- 0x0
- 0x0
- 0x0
- 0xA <-- last_added
- ---
- 0x0
-
-10. get_zval -> *last_added != NULL. -> p = *last_added; *last_added++ = NULL;
- 0x0
- 0x0
- 0x0
- 0x0
- 0x0
- ---
- 0x0 <-- last_added
-
-*/
-
-
-zval * mysqlnd_alloc_get_zval(MYSQLND_ZVAL_CACHE * const cache)
-{
- zval *ret = NULL;
-
-#ifndef MYSQLND_SILENT
- php_printf("[mysqlnd_alloc_get_zval %p] *last_added=%p free_items=%d ", cache, cache? cache->free_list->last_added:NULL, cache->free_items);
-#endif
-
- if (cache) {
- if ((ret = *cache->free_list->last_added)) {
- *cache->free_list->last_added++ = NULL;
-
- --cache->free_items;
- ++cache->get_hits;
- } else {
- ++cache->get_misses;
- }
- }
- if (!ret) {
- ALLOC_ZVAL(ret);
- }
- INIT_PZVAL(ret);
-
-#ifndef MYSQLND_SILENT
- php_printf("ret=%p\n", ret);
-#endif
- return ret;
-}
-
-static
-void mysqlnd_alloc_cache_prealloc(MYSQLND_ZVAL_CACHE * const cache, unsigned int count)
-{
- zval *data;
- cache->free_items = count;
- while (count--) {
- MAKE_STD_ZVAL(data);
- ZVAL_NULL(data);
-#ifndef MYSQLND_SILENT
- php_printf("[mysqlnd_alloc_prealloc %p] items=%d data=%p\n", cache, cache->free_items, data);
-#endif
-
- *(--cache->free_list->last_added) = data;
- }
-}
-
-void mysqlnd_alloc_zval_ptr_dtor(zval **zv, MYSQLND_ZVAL_CACHE * const cache)
-{
- if (!cache || Z_REFCOUNT_PP(zv) > 1 || cache->max_items == cache->free_items) {
-#ifndef MYSQLND_SILENT
- php_printf("[mysqlnd_alloc_zval_ptr_dtor %p]1 last_added-1=%p *zv=%p\n", cache->free_list->last_added, *zv);
-#endif
- /* We can't cache zval's with refcount > 1 */
- zval_ptr_dtor(zv);
- if (cache) {
- if (cache->max_items == cache->free_items) {
- ++cache->put_full_misses;
- } else {
- ++cache->put_refcount_misses;
- }
- }
- } else {
- /* refcount is 1 and there is place. Go, cache it! */
- ++cache->free_items;
- zval_dtor(*zv);
- ZVAL_NULL(*zv);
- *(--cache->free_list->last_added) = *zv;
- ++cache->put_hits;
- }
-#ifndef MYSQLND_SILENT
- php_printf("[mysqlnd_alloc_zval_ptr_dtor %p] free_items=%d\n", cache, cache->free_items);
-#endif
-}
-
-
-MYSQLND_ZVAL_CACHE* mysqlnd_alloc_init_cache(void)
-{
- MYSQLND_ZVAL_CACHE *ret = ecalloc(1, sizeof(MYSQLND_ZVAL_CACHE));
-
-#ifndef MYSQLND_SILENT
- php_printf("[mysqlnd_alloc_init_cache %p]\n", ret);
-#endif
-
- ret->max_items = MYSQLND_ZVALS_MAX_CACHE;
- ret->free_items = 0;
- ret->references = 1;
-
- /* Let's have always one, so we don't need to do a check in get_zval */
- ret->free_list = ecalloc(1, sizeof(struct st_mysqlnd_zval_list));
-
- /* One more for empty position of last_added */
- ret->free_list->ptr_line = ecalloc(ret->max_items + 1, sizeof(zval *));
- ret->free_list->last_added = ret->free_list->ptr_line + ret->max_items;
-
- mysqlnd_alloc_cache_prealloc(ret, (ret->max_items / 100) * 100);
-
- return ret;
-}
-
-
-MYSQLND_ZVAL_CACHE* mysqlnd_alloc_get_cache_reference(MYSQLND_ZVAL_CACHE *cache)
-{
- if (cache) {
- cache->references++;
- }
- return cache;
-}
-
-
-static
-void mysqlnd_alloc_free_cache(MYSQLND_ZVAL_CACHE *cache)
-{
-#ifndef MYSQLND_SILENT
- uint i = 0;
- php_printf("[mysqlnd_alloc_free_cache %p]\n", cache);
-#endif
-
- while (*cache->free_list->last_added) {
-#ifndef MYSQLND_SILENT
- php_printf("\t[free_item %d %p]\n", i++, *cache->free_list->last_added);
-#endif
- zval_ptr_dtor(cache->free_list->last_added);
- cache->free_list->last_added++;
- }
-#ifndef MYSQLND_DONT_DUMP_STATS
- php_printf("CACHE STATS:\n\tGET\n\t\tHITS:%lu\n\t\tMISSES=%lu\n\t\tHIT RATIO=%1.3f\n\t"
- "PUT\n\t\tHITS:%lu\n\t\tFULL_MISS=%lu\n\t\tREFC_MISS=%lu\n\t\tHIT RATIO=%1.3f\n\n",
- cache->get_hits, cache->get_misses, (1.0*cache->get_hits/(cache->get_hits + cache->get_misses)),
- cache->put_hits, cache->put_full_misses, cache->put_refcount_misses,
- (1.0 * cache->put_hits / (cache->put_hits + cache->put_full_misses + cache->put_refcount_misses)));
-#endif
- efree(cache->free_list->ptr_line);
- efree(cache->free_list);
- efree(cache);
-}
-
-
-
-void mysqlnd_alloc_free_cache_reference(MYSQLND_ZVAL_CACHE **cache)
-{
-#ifndef MYSQLND_SILENT
- php_printf("[mysqlnd_alloc_free_cache_reference %p] refs=%d\n", *cache, (*cache)->references);
-#endif
- if (*cache && --(*cache)->references == 0) {
- mysqlnd_alloc_free_cache(*cache);
- }
- *cache = NULL;
-}
-
-/*
- * Local variables:
- * tab-width: 4
- * c-basic-offset: 4
- * End:
- * vim600: noet sw=4 ts=4 fdm=marker
- * vim<600: noet sw=4 ts=4
- */
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