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A prominent bottleneck in mtr_t::commit() is log_sys.mutex between log_sys.append_prepare() and log_close(). User-visible change: The minimum innodb_log_file_size will be increased from 1MiB to 4MiB so that some conditions can be trivially satisfied. log_sys.latch (log_latch): Replaces log_sys.mutex and log_sys.flush_order_mutex. Copying mtr_t::m_log to log_sys.buf is protected by a shared log_sys.latch. Writes from log_sys.buf to the file system will be protected by an exclusive log_sys.latch. log_sys.lsn_lock: Protects the allocation of log buffer in log_sys.append_prepare(). sspin_lock: A simple spin lock, for log_sys.lsn_lock. Thanks to Vladislav Vaintroub for suggesting this idea, and for reviewing these changes. mariadb-backup: Replace some use of log_sys.mutex with recv_sys.mutex. buf_pool_t::insert_into_flush_list(): Implement sorting of flush_list because ordering is otherwise no longer guaranteed. Ordering by LSN is needed for the proper operation of redo log checkpoints. log_sys.append_prepare(): Advance log_sys.lsn and log_sys.buf_free by the length, and return the old values. Also increment write_to_buf, which was previously done in log_close(). mtr_t::finish_write(): Obtain the buffer pointer from log_sys.append_prepare(). log_sys.buf_free: Make the field Atomic_relaxed, to simplify log_flush_margin(). Use only loads and stores to avoid costly read-modify-write atomic operations. buf_pool.flush_list_requests: Replaces export_vars.innodb_buffer_pool_write_requests and srv_stats.buf_pool_write_requests. Protected by buf_pool.flush_list_mutex. buf_pool_t::insert_into_flush_list(): Do not invoke page_cleaner_wakeup(). Let the caller do that after a batch of calls. recv_recover_page(): Invoke a minimal part of buf_pool.insert_into_flush_list(). ReleaseBlocks::modified: A number of pages added to buf_pool.flush_list. ReleaseBlocks::operator(): Merge buf_flush_note_modification() here. log_t::set_capacity(): Renamed from log_set_capacity().
126 lines
4.9 KiB
C
126 lines
4.9 KiB
C
/*****************************************************************************
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Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2014, 2022, 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.h
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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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#pragma once
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#include "ut0byte.h"
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#include "log0log.h"
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#include "buf0buf.h"
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/** Number of pages flushed. Protected by buf_pool.mutex. */
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extern ulint buf_flush_page_count;
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/** Number of pages flushed via LRU. Protected by buf_pool.mutex.
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Also included in buf_flush_page_count. */
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extern ulint buf_lru_flush_page_count;
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/** Number of pages freed without flushing. Protected by buf_pool.mutex. */
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extern ulint buf_lru_freed_page_count;
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/** Flag indicating if the page_cleaner is in active state. */
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extern Atomic_relaxed<bool> buf_page_cleaner_is_active;
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/** Remove all dirty pages belonging to a given tablespace when we are
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deleting the data file of that tablespace.
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The pages still remain a part of LRU and are evicted from
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the list as they age towards the tail of the LRU.
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@param id tablespace identifier */
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void buf_flush_remove_pages(uint32_t id);
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/*******************************************************************//**
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Relocates a buffer control block on the flush_list.
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Note that it is assumed that the contents of bpage has already been
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copied to dpage. */
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ATTRIBUTE_COLD
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void
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buf_flush_relocate_on_flush_list(
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/*=============================*/
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buf_page_t* bpage, /*!< in/out: control block being moved */
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buf_page_t* dpage); /*!< in/out: destination block */
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/** Complete write of a file page from buf_pool.
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@param request write request */
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void buf_page_write_complete(const IORequest &request);
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/** Assign the full crc32 checksum for non-compressed page.
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@param[in,out] page page to be updated */
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void buf_flush_assign_full_crc32_checksum(byte* page);
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/** Initialize a page for writing to the tablespace.
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@param[in] block buffer block; NULL if bypassing the buffer pool
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@param[in,out] page page frame
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@param[in,out] page_zip_ compressed page, or NULL if uncompressed
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@param[in] use_full_checksum whether tablespace uses full checksum */
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void
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buf_flush_init_for_writing(
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const buf_block_t* block,
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byte* page,
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void* page_zip_,
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bool use_full_checksum);
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/** Try to flush dirty pages that belong to a given tablespace.
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@param space tablespace
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@param n_flushed number of pages written
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@return whether the flush for some pages might not have been initiated */
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bool buf_flush_list_space(fil_space_t *space, ulint *n_flushed= nullptr)
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MY_ATTRIBUTE((warn_unused_result));
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/** Write out dirty blocks from buf_pool.LRU.
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@param max_n wished maximum mumber of blocks flushed
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@return the number of processed pages
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@retval 0 if a buf_pool.LRU batch is already running */
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ulint buf_flush_LRU(ulint max_n);
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/** Wait until a flush batch ends.
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@param lru true=buf_pool.LRU; false=buf_pool.flush_list */
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void buf_flush_wait_batch_end(bool lru);
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/** Wait until all persistent pages are flushed up to a limit.
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@param sync_lsn buf_pool.get_oldest_modification(LSN_MAX) to wait for */
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ATTRIBUTE_COLD void buf_flush_wait_flushed(lsn_t sync_lsn);
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/** Initiate more eager page flushing if the log checkpoint age is too old.
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@param lsn buf_pool.get_oldest_modification(LSN_MAX) target
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@param furious true=furious flushing, false=limit to innodb_io_capacity */
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ATTRIBUTE_COLD void buf_flush_ahead(lsn_t lsn, bool furious);
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/** Initialize page_cleaner. */
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ATTRIBUTE_COLD void buf_flush_page_cleaner_init();
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/** Wait for pending flushes to complete. */
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void buf_flush_wait_batch_end_acquiring_mutex(bool lru);
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/** Flush the buffer pool on shutdown. */
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ATTRIBUTE_COLD void buf_flush_buffer_pool();
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#ifdef UNIV_DEBUG
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/** Validate the flush list. */
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void buf_flush_validate();
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#endif /* UNIV_DEBUG */
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/** Synchronously flush dirty blocks during recv_sys_t::apply().
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NOTE: The calling thread is not allowed to hold any buffer page latches! */
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void buf_flush_sync_batch(lsn_t lsn);
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/** Synchronously flush dirty blocks.
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NOTE: The calling thread is not allowed to hold any buffer page latches! */
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void buf_flush_sync();
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