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22b62edaed
buf_page_write_complete(): Reduce the buf_pool.mutex hold time, and do not acquire buf_pool.flush_list_mutex at all. Instead, mark blocks clean by setting oldest_modification to 1. Dirty pages of temporary tables will be identified by the special value 2 instead of the previous special value 1. (By design of the ib_logfile0 format, actual LSN values smaller than 2048 are not possible.) buf_LRU_free_page(), buf_pool_t::get_oldest_modification() and many other functions will remove the garbage (clean blocks) from buf_pool.flush_list while holding buf_pool.flush_list_mutex. buf_pool_t::n_flush_LRU, buf_pool_t::n_flush_list: Replaced with non-atomic variables, protected by buf_pool.mutex, to avoid unnecessary synchronization when modifying the counts. export_vars: Remove unnecessary indirection for innodb_pages_created, innodb_pages_read, innodb_pages_written.
66 lines
2.4 KiB
Text
66 lines
2.4 KiB
Text
/*****************************************************************************
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Copyright (c) 1995, 2015, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2019, 2021, 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/buf0flu.ic
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The database buffer pool flush algorithm
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Created 11/5/1995 Heikki Tuuri
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*******************************************************/
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#include "assume_aligned.h"
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#include "buf0buf.h"
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#include "srv0srv.h"
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/********************************************************************//**
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This function should be called at a mini-transaction commit, if a page was
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modified in it. Puts the block to the list of modified blocks, if it is not
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already in it. */
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UNIV_INLINE
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void
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buf_flush_note_modification(
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/*========================*/
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buf_block_t* block, /*!< in: block which is modified */
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lsn_t start_lsn, /*!< in: start lsn of the mtr that
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modified this block */
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lsn_t end_lsn) /*!< in: end lsn of the mtr that
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modified this block */
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{
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ut_ad(!srv_read_only_mode);
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ut_ad(block->page.state() == BUF_BLOCK_FILE_PAGE);
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ut_ad(block->page.buf_fix_count());
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ut_ad(mach_read_from_8(block->frame + FIL_PAGE_LSN) <= end_lsn);
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mach_write_to_8(block->frame + FIL_PAGE_LSN, end_lsn);
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if (UNIV_LIKELY_NULL(block->page.zip.data)) {
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memcpy_aligned<8>(FIL_PAGE_LSN + block->page.zip.data,
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FIL_PAGE_LSN + block->frame, 8);
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}
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const lsn_t oldest_modification = block->page.oldest_modification();
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if (oldest_modification > 1) {
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ut_ad(oldest_modification <= start_lsn);
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} else if (fsp_is_system_temporary(block->page.id().space())) {
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block->page.set_temp_modified();
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} else {
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buf_pool.insert_into_flush_list(block, start_lsn);
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}
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srv_stats.buf_pool_write_requests.inc();
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}
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