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Diffstat (limited to 'storage/xtradb/include/buf0buddy.h')
| -rw-r--r-- | storage/xtradb/include/buf0buddy.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/storage/xtradb/include/buf0buddy.h b/storage/xtradb/include/buf0buddy.h new file mode 100644 index 00000000000..2afef7913fc --- /dev/null +++ b/storage/xtradb/include/buf0buddy.h @@ -0,0 +1,91 @@ +/***************************************************************************** + +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 +*******************************************************/ + +#ifndef buf0buddy_h +#define buf0buddy_h + +#ifdef UNIV_MATERIALIZE +# undef UNIV_INLINE +# define UNIV_INLINE +#endif + +#include "univ.i" +#include "buf0types.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. 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) + __attribute__((malloc)); + +/************************************************************************** +Release 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) + __attribute__((nonnull)); + +/** Statistics of buddy blocks of a given size. */ +struct buf_buddy_stat_struct { + /** Number of blocks allocated from the buddy system. */ + ulint used; + /** Number of blocks relocated by the buddy system. */ + ib_uint64_t relocated; + /** Total duration of block relocations, in microseconds. */ + ib_uint64_t relocated_usec; +}; + +typedef struct buf_buddy_stat_struct buf_buddy_stat_t; + +/** Statistics of the buddy system, indexed by block size. +Protected by buf_pool_mutex. */ +extern buf_buddy_stat_t buf_buddy_stat[BUF_BUDDY_SIZES + 1]; + +#ifndef UNIV_NONINL +# include "buf0buddy.ic" +#endif + +#endif /* buf0buddy_h */ |