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bb48d7bc81
buf_buddy_shrink(): Properly cover the case when KEY_BLOCK_SIZE corresponds to the innodb_page_size, that is, the ROW_FORMAT=COMPRESSED page frame is directly allocated from the buffer pool, not via the binary buddy allocator. buf_LRU_check_size_of_non_data_objects(): Avoid a crash when the buffer pool is being shrunk. buf_pool_t::shrink(): Abort if over 95% of the shrunk buffer pool would be occupied by the adaptive hash index or record locks.
89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/*****************************************************************************
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Copyright (c) 2006, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2018, 2020, MariaDB Corporation.
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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.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 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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#pragma once
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#include "buf0types.h"
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/**
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@param[in] block size in bytes
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@return index of buf_pool.zip_free[], or BUF_BUDDY_SIZES */
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inline ulint buf_buddy_get_slot(ulint size) noexcept
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{
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ulint i;
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ulint s;
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ut_ad(ut_is_2pow(size));
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ut_ad(size >= UNIV_ZIP_SIZE_MIN);
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ut_ad(size <= srv_page_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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/** Allocate a ROW_FORMAT=COMPRESSED block.
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@param i index of buf_pool.zip_free[] or BUF_BUDDY_SIZES
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@param lru assigned to true if buf_pool.mutex was temporarily released
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@return allocated block, never NULL */
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byte *buf_buddy_alloc_low(ulint i, bool *lru) noexcept MY_ATTRIBUTE((malloc));
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/** Allocate a ROW_FORMAT=COMPRESSED block.
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@param size compressed page size in bytes
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@param lru assigned to true if buf_pool.mutex was temporarily released
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@return allocated block, never NULL */
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inline byte *buf_buddy_alloc(ulint size, bool *lru= nullptr) noexcept
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{
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return buf_buddy_alloc_low(buf_buddy_get_slot(size), lru);
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}
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/** Deallocate a block.
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@param[in] buf block to be freed, must not be pointed to
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by the buffer pool
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@param[in] i index of buf_pool.zip_free[], or BUF_BUDDY_SIZES */
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void buf_buddy_free_low(void* buf, ulint i) noexcept;
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/** Deallocate a block.
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@param[in] buf block to be freed, must not be pointed to
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by the buffer pool
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@param[in] size block size in bytes */
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inline void buf_buddy_free(void* buf, ulint size) noexcept
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{
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buf_buddy_free_low(buf, buf_buddy_get_slot(size));
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}
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ATTRIBUTE_COLD MY_ATTRIBUTE((nonnull, warn_unused_result))
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/** Reallocate a ROW_FORMAT=COMPRESSED page frame during buf_pool_t::shrink().
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@param bpage page descriptor covering a ROW_FORMAT=COMPRESSED page
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@param block uncompressed block for storage
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@return block
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@retval nullptr if the block was consumed */
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ATTRIBUTE_COLD
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buf_block_t *buf_buddy_shrink(buf_page_t *bpage, buf_block_t *block) noexcept;
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/** Combine all pairs of free buddies.
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@param size the target innodb_buffer_pool_size */
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ATTRIBUTE_COLD void buf_buddy_condense_free(size_t size) noexcept;
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