Import Percona XtraDB into the MariaDB source tree.

1 files changed, 147 insertions, 0 deletions

diff --git a/storage/xtradb/include/buf0buddy.ic b/storage/xtradb/include/buf0buddy.ic
new file mode 100644
index 00000000000..7d46b140449
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+++ b/storage/xtradb/include/buf0buddy.ic
@@ -0,0 +1,147 @@
+/*****************************************************************************
+
+Copyright (c) 2006, 2009, Innobase Oy. All Rights Reserved.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+
+*****************************************************************************/
+
+/******************************************************
+Binary buddy allocator for compressed pages
+
+Created December 2006 by Marko Makela
+*******************************************************/
+
+#ifdef UNIV_MATERIALIZE
+# undef UNIV_INLINE
+# define UNIV_INLINE
+#endif
+
+#include "buf0buf.h"
+#include "buf0buddy.h"
+#include "ut0ut.h"
+#include "sync0sync.h"
+
+/**************************************************************************
+Allocate a block.  The thread calling this function must hold
+buf_pool_mutex and must not hold buf_pool_zip_mutex or any block->mutex.
+The buf_pool_mutex may only be released and reacquired if lru != NULL. */
+UNIV_INTERN
+void*
+buf_buddy_alloc_low(
+/*================*/
+			/* out: allocated block,
+			possibly NULL if lru==NULL */
+	ulint	i,	/* in: index of buf_pool->zip_free[],
+			or BUF_BUDDY_SIZES */
+	ibool*	lru,	/* in: pointer to a variable that will be assigned
+			TRUE if storage was allocated from the LRU list
+			and buf_pool_mutex was temporarily released,
+			or NULL if the LRU list should not be used */
+	ibool	have_page_hash_mutex)
+	__attribute__((malloc));
+
+/**************************************************************************
+Deallocate a block. */
+UNIV_INTERN
+void
+buf_buddy_free_low(
+/*===============*/
+	void*	buf,	/* in: block to be freed, must not be
+			pointed to by the buffer pool */
+	ulint	i,	/* in: index of buf_pool->zip_free[],
+			or BUF_BUDDY_SIZES */
+	ibool	have_page_hash_mutex)
+	__attribute__((nonnull));
+
+/**************************************************************************
+Get the index of buf_pool->zip_free[] for a given block size. */
+UNIV_INLINE
+ulint
+buf_buddy_get_slot(
+/*===============*/
+			/* out: index of buf_pool->zip_free[],
+			or BUF_BUDDY_SIZES */
+	ulint	size)	/* in: block size */
+{
+	ulint	i;
+	ulint	s;
+
+	for (i = 0, s = BUF_BUDDY_LOW; s < size; i++, s <<= 1) {
+	}
+
+	ut_ad(i <= BUF_BUDDY_SIZES);
+	return(i);
+}
+
+/**************************************************************************
+Allocate a block.  The thread calling this function must hold
+buf_pool_mutex and must not hold buf_pool_zip_mutex or any
+block->mutex.  The buf_pool_mutex may only be released and reacquired
+if lru != NULL.  This function should only be used for allocating
+compressed page frames or control blocks (buf_page_t).  Allocated
+control blocks must be properly initialized immediately after
+buf_buddy_alloc() has returned the memory, before releasing
+buf_pool_mutex. */
+UNIV_INLINE
+void*
+buf_buddy_alloc(
+/*============*/
+			/* out: allocated block,
+			possibly NULL if lru == NULL */
+	ulint	size,	/* in: block size, up to UNIV_PAGE_SIZE */
+	ibool*	lru,	/* in: pointer to a variable that will be assigned
+			TRUE if storage was allocated from the LRU list
+			and buf_pool_mutex was temporarily released,
+			or NULL if the LRU list should not be used */
+	ibool	have_page_hash_mutex)
+{
+	//ut_ad(buf_pool_mutex_own());
+
+	return(buf_buddy_alloc_low(buf_buddy_get_slot(size), lru, have_page_hash_mutex));
+}
+
+/**************************************************************************
+Deallocate a block. */
+UNIV_INLINE
+void
+buf_buddy_free(
+/*===========*/
+	void*	buf,	/* in: block to be freed, must not be
+			pointed to by the buffer pool */
+	ulint	size,	/* in: block size, up to UNIV_PAGE_SIZE */
+	ibool	have_page_hash_mutex)
+{
+	//ut_ad(buf_pool_mutex_own());
+
+	if (!have_page_hash_mutex) {
+		mutex_enter(&LRU_list_mutex);
+		mutex_enter(&flush_list_mutex);
+		rw_lock_x_lock(&page_hash_latch);
+	}
+
+	mutex_enter(&zip_free_mutex);
+	buf_buddy_free_low(buf, buf_buddy_get_slot(size), TRUE);
+	mutex_exit(&zip_free_mutex);
+
+	if (!have_page_hash_mutex) {
+		mutex_exit(&LRU_list_mutex);
+		mutex_exit(&flush_list_mutex);
+		rw_lock_x_unlock(&page_hash_latch);
+	}
+}
+
+#ifdef UNIV_MATERIALIZE
+# undef UNIV_INLINE
+# define UNIV_INLINE	UNIV_INLINE_ORIGINAL
+#endif