Marko Mäkelä 76f6b6d818 MDEV-34515: Reduce context switching in purge ... Before this patch, the InnoDB purge coordinator task submitted innodb_purge_threads-1 tasks even if there was not sufficient amount of work for all of them. For example, if there are undo log records only for 1 table, only 1 task can be employed, and that task had better be the purge coordinator. srv_purge_worker_task_low(): Split from purge_worker_callback(). trx_purge_attach_undo_recs(): Remove the parameter n_purge_threads, and add the parameter n_work_items, to keep track of the amount of work. trx_purge(): Launch purge worker tasks only if necessary. The work of one thread will be executed by this purge coordinator thread. que_fork_scheduler_round_robin(): Merged to trx_purge(). Thanks to Vladislav Vaintroub for supplying a prototype of this. Reviewed by: Debarun Banerjee		2024-08-26 12:23:17 +03:00
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que0que.cc	MDEV-34515: Reduce context switching in purge	2024-08-26 12:23:17 +03:00