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For more convenient monitoring of something that could greatly affect the volume of page writes, we add the status variable Innodb_buffer_pool_pages_split that was previously only available via information_schema.innodb_metrics as "innodb_page_splits". This was suggested by Axel Schwenke. buf_flush_page_count: Replaced with buf_pool.stat.n_pages_written. We protect buf_pool.stat (except n_page_gets) with buf_pool.mutex and remove unnecessary export_vars indirection. buf_pool.flush_list_bytes: Moved from buf_pool.stat.flush_list_bytes. Protected by buf_pool.flush_list_mutex. buf_pool_t::page_cleaner_status: Replaces buf_pool_t::n_flush_LRU_, buf_pool_t::n_flush_list_, and buf_pool_t::page_cleaner_is_idle. Protected by buf_pool.flush_list_mutex. We will exclusively broadcast buf_pool.done_flush_list by the buf_flush_page_cleaner thread, and only wait for it when communicating with buf_flush_page_cleaner. There is no need to keep a count of pending writes by the buf_pool.flush_list processing. A single flag suffices for that. Waits for page write completion can be performed by simply waiting on block->page.lock, or by invoking buf_dblwr.wait_for_page_writes(). buf_LRU_block_free_non_file_page(): Broadcast buf_pool.done_free and set buf_pool.try_LRU_scan when freeing a page. This would be executed also as part of buf_page_write_complete(). buf_page_write_complete(): Do not broadcast buf_pool.done_flush_list, and do not acquire buf_pool.mutex unless buf_pool.LRU eviction is needed. Let buf_dblwr count all writes to persistent pages and broadcast a condition variable when no outstanding writes remain. buf_flush_page_cleaner(): Prioritize LRU flushing and eviction right after "furious flushing" (lsn_limit). Simplify the conditions and reduce the hold time of buf_pool.flush_list_mutex. Refuse to shut down or sleep if buf_pool.ran_out(), that is, LRU eviction is needed. buf_pool_t::page_cleaner_wakeup(): Add the optional parameter for_LRU. buf_LRU_get_free_block(): Protect buf_lru_free_blocks_error_printed with buf_pool.mutex. Invoke buf_pool.page_cleaner_wakeup(true) to to ensure that buf_flush_page_cleaner() will process the LRU flush request. buf_do_LRU_batch(), buf_flush_list(), buf_flush_list_space(): Update buf_pool.stat.n_pages_written when submitting writes (while holding buf_pool.mutex), not when completing them. buf_page_t::flush(), buf_flush_discard_page(): Require that the page U-latch be acquired upfront, and remove buf_page_t::ready_for_flush(). buf_pool_t::delete_from_flush_list(): Remove the parameter "bool clear". buf_flush_page(): Count pending page writes via buf_dblwr. buf_flush_try_neighbors(): Take the block of page_id as a parameter. If the tablespace is dropped before our page has been written out, release the page U-latch. buf_pool_invalidate(): Let the caller ensure that there are no outstanding writes. buf_flush_wait_batch_end(false), buf_flush_wait_batch_end_acquiring_mutex(false): Replaced with buf_dblwr.wait_for_page_writes(). buf_flush_wait_LRU_batch_end(): Replaces buf_flush_wait_batch_end(true). buf_flush_list(): Remove some broadcast of buf_pool.done_flush_list. buf_flush_buffer_pool(): Invoke also buf_dblwr.wait_for_page_writes(). buf_pool_t::io_pending(), buf_pool_t::n_flush_list(): Remove. Outstanding writes are reflected by buf_dblwr.pending_writes(). buf_dblwr_t::init(): New function, to initialize the mutex and the condition variables, but not the backing store. buf_dblwr_t::is_created(): Replaces buf_dblwr_t::is_initialised(). buf_dblwr_t::pending_writes(), buf_dblwr_t::writes_pending: Keeps track of writes of persistent data pages. buf_flush_LRU(): Allow calls while LRU flushing may be in progress in another thread. Tested by Matthias Leich (correctness) and Axel Schwenke (performance) |
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