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143 lines
4.5 KiB
Text
143 lines
4.5 KiB
Text
/*****************************************************************************
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Copyright (c) 2006, 2011, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/buf0buddy.ic
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Binary buddy allocator for compressed pages
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Created December 2006 by Marko Makela
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*******************************************************/
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#ifdef UNIV_MATERIALIZE
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# undef UNIV_INLINE
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# define UNIV_INLINE
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#endif
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#include "buf0buf.h"
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#include "buf0buddy.h"
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#include "ut0ut.h"
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#include "sync0sync.h"
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/**********************************************************************//**
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Allocate a block. The thread calling this function must hold
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buf_pool->mutex and must not hold buf_pool->zip_mutex or any block->mutex.
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The buf_pool_mutex may be released and reacquired.
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@return allocated block, never NULL */
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UNIV_INTERN
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void*
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buf_buddy_alloc_low(
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/*================*/
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buf_pool_t* buf_pool, /*!< in/out: buffer pool instance */
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ulint i, /*!< in: index of buf_pool->zip_free[],
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or BUF_BUDDY_SIZES */
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ibool* lru) /*!< in: pointer to a variable that
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will be assigned TRUE if storage was
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allocated from the LRU list and
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buf_pool->mutex was temporarily
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released */
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__attribute__((malloc, nonnull));
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/**********************************************************************//**
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Deallocate a block. */
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UNIV_INTERN
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void
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buf_buddy_free_low(
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/*===============*/
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buf_pool_t* buf_pool, /*!< in: buffer pool instance */
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void* buf, /*!< in: block to be freed, must not be
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pointed to by the buffer pool */
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ulint i) /*!< in: index of buf_pool->zip_free[],
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or BUF_BUDDY_SIZES */
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__attribute__((nonnull));
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/**********************************************************************//**
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Get the index of buf_pool->zip_free[] for a given block size.
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@return index of buf_pool->zip_free[], or BUF_BUDDY_SIZES */
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UNIV_INLINE
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ulint
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buf_buddy_get_slot(
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/*===============*/
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ulint size) /*!< in: block size */
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{
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ulint i;
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ulint s;
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ut_ad(size >= PAGE_ZIP_MIN_SIZE);
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for (i = 0, s = BUF_BUDDY_LOW; s < size; i++, s <<= 1) {
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}
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ut_ad(i <= BUF_BUDDY_SIZES);
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return(i);
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}
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/**********************************************************************//**
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Allocate a block. The thread calling this function must hold
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buf_pool->mutex and must not hold buf_pool->zip_mutex or any
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block->mutex. The buf_pool->mutex may be released and reacquired.
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This function should only be used for allocating compressed page frames.
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@return allocated block, never NULL */
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UNIV_INLINE
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byte*
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buf_buddy_alloc(
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/*============*/
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buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
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the page resides */
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ulint size, /*!< in: compressed page size
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(between PAGE_ZIP_MIN_SIZE and
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UNIV_PAGE_SIZE) */
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ibool* lru) /*!< in: pointer to a variable
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that will be assigned TRUE if
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storage was allocated from the
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LRU list and buf_pool->mutex was
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temporarily released */
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{
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ut_ad(buf_pool_mutex_own(buf_pool));
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ut_ad(ut_is_2pow(size));
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ut_ad(size >= PAGE_ZIP_MIN_SIZE);
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ut_ad(size <= UNIV_PAGE_SIZE);
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return((byte*) buf_buddy_alloc_low(buf_pool, buf_buddy_get_slot(size),
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lru));
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}
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/**********************************************************************//**
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Deallocate a block. */
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UNIV_INLINE
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void
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buf_buddy_free(
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/*===========*/
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buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
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the block resides */
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void* buf, /*!< in: block to be freed, must not
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be pointed to by the buffer pool */
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ulint size) /*!< in: block size,
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up to UNIV_PAGE_SIZE */
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{
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ut_ad(buf_pool_mutex_own(buf_pool));
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ut_ad(ut_is_2pow(size));
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ut_ad(size >= PAGE_ZIP_MIN_SIZE);
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ut_ad(size <= UNIV_PAGE_SIZE);
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buf_buddy_free_low(buf_pool, buf, buf_buddy_get_slot(size));
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}
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#ifdef UNIV_MATERIALIZE
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# undef UNIV_INLINE
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# define UNIV_INLINE UNIV_INLINE_ORIGINAL
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#endif
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