[Project] Start reworking of the mempool structure

- Hide implementation details
- Pre-allocate one chain on start
- Organize destructors as a list of structures
- Use posix_memalign instead of malloc
- Adjust allocation layout

1 files changed, 81 insertions, 0 deletions

diff --git a/src/libutil/mem_pool_internal.h b/src/libutil/mem_pool_internal.h
new file mode 100644
index 000000000..9341fce08
--- /dev/null
+++ b/src/libutil/mem_pool_internal.h
@@ -0,0 +1,81 @@
+/*-
+ * Copyright 2019 Vsevolod Stakhov
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RSPAMD_MEM_POOL_INTERNAL_H
+#define RSPAMD_MEM_POOL_INTERNAL_H
+
+/*
+ * Internal memory pool stuff
+ */
+
+#define align_ptr(p, a)                                                   \
+    (guint8 *) (((uintptr_t) (p) + ((uintptr_t) a - 1)) & ~((uintptr_t) a - 1))
+
+enum rspamd_mempool_chain_type {
+	RSPAMD_MEMPOOL_NORMAL = 0,
+	RSPAMD_MEMPOOL_SHARED,
+	RSPAMD_MEMPOOL_MAX
+};
+#define ENTRY_LEN 128
+#define ENTRY_NELTS 64
+
+struct entry_elt {
+	guint32 fragmentation;
+	guint32 leftover;
+};
+
+struct rspamd_mempool_entry_point {
+	gchar src[ENTRY_LEN];
+	guint32 cur_suggestion;
+	guint32 cur_elts;
+	struct entry_elt elts[ENTRY_NELTS];
+};
+
+/**
+ * Destructors list item structure
+ */
+struct _pool_destructors {
+	rspamd_mempool_destruct_t func;         /**< pointer to destructor					*/
+	void *data;                             /**< data to free							*/
+	const gchar *function;                  /**< function from which this destructor was added */
+	const gchar *loc;                       /**< line number                            */
+	struct _pool_destructors *next;
+};
+
+struct rspamd_mempool_specific {
+	struct _pool_chain *pools[RSPAMD_MEMPOOL_MAX];
+	struct _pool_destructors *dtors_head, *dtors_tail;
+	GPtrArray *trash_stack;
+	GHashTable *variables;                  /**< private memory pool variables			*/
+	gsize elt_len;                            /**< size of an element						*/
+	gsize used_memory;
+	gsize wasted_memory;
+	struct rspamd_mempool_entry_point *entry;
+};
+
+/**
+ * Pool page structure
+ */
+struct _pool_chain {
+	guint8 *begin;                  /**< begin of pool chain block              */
+	guint8 *pos;                    /**< current start of free space in block   */
+	gsize slice_size;                      /**< length of block                        */
+	rspamd_mempool_mutex_t *lock;
+	struct _pool_chain *next;
+};
+
+
+#endif