/***************************************************************************** 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 */ __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 */ __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 */ { ut_ad(buf_pool_mutex_own()); return(buf_buddy_alloc_low(buf_buddy_get_slot(size), lru)); } /************************************************************************** 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 */ { ut_ad(buf_pool_mutex_own()); buf_buddy_free_low(buf, buf_buddy_get_slot(size)); } #ifdef UNIV_MATERIALIZE # undef UNIV_INLINE # define UNIV_INLINE UNIV_INLINE_ORIGINAL #endif