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/*****************************************************************************
Copyright (c) 2006, 2016, Oracle and/or its affiliates. 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.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/buf0buddy.ic
Binary buddy allocator for compressed pages
Created December 2006 by Marko Makela
*******************************************************/
#include "buf0buf.h"
#include "buf0buddy.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 be released and reacquired.
@return allocated block, never NULL */
void*
buf_buddy_alloc_low(
/*================*/
buf_pool_t* buf_pool, /*!< in/out: buffer pool instance */
ulint i, /*!< in: index of buf_pool->zip_free[],
or BUF_BUDDY_SIZES */
bool* 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 */
MY_ATTRIBUTE((malloc, nonnull));
/**********************************************************************//**
Deallocate a block. */
void
buf_buddy_free_low(
/*===============*/
buf_pool_t* buf_pool, /*!< in: buffer pool instance */
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 */
MY_ATTRIBUTE((nonnull));
/**********************************************************************//**
Get the index of buf_pool->zip_free[] for a given block size.
@return index of buf_pool->zip_free[], or BUF_BUDDY_SIZES */
UNIV_INLINE
ulint
buf_buddy_get_slot(
/*===============*/
ulint size) /*!< in: block size */
{
ulint i;
ulint s;
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
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 be released and reacquired.
This function should only be used for allocating compressed page frames.
@return allocated block, never NULL */
UNIV_INLINE
byte*
buf_buddy_alloc(
/*============*/
buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
the page resides */
ulint size, /*!< in: compressed page size
(between UNIV_ZIP_SIZE_MIN and
srv_page_size) */
bool* 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 */
{
ut_ad(buf_pool_mutex_own(buf_pool));
ut_ad(ut_is_2pow(size));
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
ut_ad(size <= srv_page_size);
return((byte*) buf_buddy_alloc_low(buf_pool, buf_buddy_get_slot(size),
lru));
}
/**********************************************************************//**
Deallocate a block. */
UNIV_INLINE
void
buf_buddy_free(
/*===========*/
buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
the block resides */
void* buf, /*!< in: block to be freed, must not
be pointed to by the buffer pool */
ulint size) /*!< in: block size,
up to srv_page_size */
{
ut_ad(buf_pool_mutex_own(buf_pool));
ut_ad(ut_is_2pow(size));
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
ut_ad(size <= srv_page_size);
buf_buddy_free_low(buf_pool, buf, buf_buddy_get_slot(size));
}
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