Also, default to innodb_purge_batch_size=1000,
replacing the old default value of processing 300 undo log pages
in a batch. Axel Schwenke found this value to help reduce purge lag
without having a significant impact on workload throughput.
In purge, we can simply acquire a shared latch on the undo log page
(to avoid a race condition like the one that was fixed in
commit b102872ad5) and retain a buffer-fix
after releasing the latch. The buffer-fix will prevent the undo log
page from being evicted from the buffer pool. Concurrent modification
is prevented by design. Only the purge_coordinator_task
(or its accomplice purge_truncation_task) may free the undo log pages,
after any purge_worker_task have completed execution. Hence, we do not
have to worry about any overwriting or reuse of the undo log records.
trx_undo_rec_copy(): Remove. The only remaining caller would have been
trx_undo_get_undo_rec_low(), which is where the logic was merged.
purge_sys_t::m_initialized: Replaces heap.
purge_sys_t::pages: A cache of buffer-fixed pages that have been
looked up from buf_pool.page_hash.
purge_sys_t::get_page(): Return a buffer-fixed undo page, using the
pages cache.
trx_purge_t::batch_cleanup(): Renamed from clone_end_view().
Clear the pages cache and clone the end_view at the end of a batch.
purge_sys_t::n_pages_handled(): Return pages.size(). This determines
if innodb_purge_batch_size was exceeded.
purge_sys_t::rseg_get_next_history_log(): Replaces
trx_purge_rseg_get_next_history_log().
purge_sys_t::choose_next_log(): Replaces trx_purge_choose_next_log()
and trx_purge_read_undo_rec().
purge_sys_t::get_next_rec(): Replaces trx_purge_get_next_rec()
and trx_undo_get_next_rec().
purge_sys_t::fetch_next_rec(): Replaces trx_purge_fetch_next_rec()
and some use of trx_undo_get_first_rec().
trx_purge_attach_undo_recs(): Do not allow purge_sys.n_pages_handled()
exceed the innodb_purge_batch_size or ¾ of the buffer pool, whichever
is smaller.
Reviewed by: Vladislav Lesin
Tested by: Matthias Leich and Axel Schwenke
aa719b5010