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approved by: Marko rb://681 Coalescing of free buf_page_t descriptors can prove to be one severe bottleneck in performance of compression. One such workload where it hurts badly is DROP TABLE. This patch removes buf_page_t allocations from buf_buddy and uses ut_malloc instead. In order to further reduce overhead of colaescing we no longer attempt to coalesce a block if the corresponding free_list is less than 16 in size.
86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/*****************************************************************************
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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.h
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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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#ifndef buf0buddy_h
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#define buf0buddy_h
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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 "univ.i"
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#include "buf0types.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
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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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void*
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buf_buddy_alloc(
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/*============*/
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ulint size, /*!< in: compressed page size
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(between PAGE_ZIP_MIN_SIZE and UNIV_PAGE_SIZE) */
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ibool* lru) /*!< in: pointer to a variable that will be assigned
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TRUE if storage was allocated from the LRU list
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and buf_pool_mutex was temporarily released */
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__attribute__((malloc, nonnull));
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/**********************************************************************//**
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Release 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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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 size) /*!< in: block size, up to UNIV_PAGE_SIZE */
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__attribute__((nonnull));
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/** Statistics of buddy blocks of a given size. */
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struct buf_buddy_stat_struct {
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/** Number of blocks allocated from the buddy system. */
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ulint used;
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/** Number of blocks relocated by the buddy system. */
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ib_uint64_t relocated;
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/** Total duration of block relocations, in microseconds. */
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ib_uint64_t relocated_usec;
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};
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/** Statistics of buddy blocks of a given size. */
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typedef struct buf_buddy_stat_struct buf_buddy_stat_t;
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/** Statistics of the buddy system, indexed by block size.
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Protected by buf_pool_mutex. */
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extern buf_buddy_stat_t buf_buddy_stat[BUF_BUDDY_SIZES + 1];
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#ifndef UNIV_NONINL
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# include "buf0buddy.ic"
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#endif
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#endif /* buf0buddy_h */
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