InnoDB1.1.8版本Master thread内部逻辑

	Change Buffer	Redo Log Buffer	Undo Log	Modified Page	Next Loop
Loop /second	if [ last_one_second_ios -lt 5% innodb_io_capacity ] then          merge 5% innodb_io_capacity change buffer; fi	Always	Always Not	if [ modified_page_pct -gt innodb_max_dirty_pages_pct ] then         flush 100% innodb_io_capacity modified page; else         innodb_adaptive_flushing modified page; fi	if [ no user activity ] then     goto [Background Loop]; fi
Loop /10 seconds	merge 5% innodb_io_capacity change buffer;	Always	purge 100% purge_batch_size undo log	if [ last_ten_second_ios -lt 100% innodb_io_capacity ] then          flush 100% innodb_io_capacity modified page; fi if [ modified_page_pct -gt 70% ] then         flush 100% innodb_io_capacity modified page; else          flush 10% innodb_io_capacity modified page; fi	goto [Loop / second]
Background Loop	merge 100% innodb_io_capacity change buffer;	Always Not	purge 100% purge_batch_size undo log	Always Not	if [ not idle ] then     goto [Loop / second]; else     goto [Flush Loop]; fi
Flush Loop	Always Not	Always Not	Always Not	while [ modified_page_pct -gt innodb_max_dirty_pages_pct ] do         flush 100% innodb_io_capacity modified page; done	goto [Suspend Loop]
Suspend Loop	Always Not	Always Not	Always Not	Always Not	if [ has new event ] then     goto [Loop / second]; fi