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MDEV-24949: Enabling idle flushing (possible regression from MDEV-23855)
- Currently page cleaner thread will stop flushing if dirty_pct < innodb_max_dirty_pages_pct_lwm. - If the server is not performing any activity then said resources/time could be used to flush the pending dirty pages and keep buffer pool clean for the next burst of the cycle. This flushing is called idle flushing. - flushing logic underwent a complete revamp in 10.5.7/8 and as part of the revamp idle flushing logic got removed. - New proposed logic of idle flushing is based on updated logic of the page cleaner that will enable idle flushing if - buf page cleaner is idle - there are dirty pages (< innodb_max_dirty_pages_pct_lwm) - server is not performing any activity Logic will kickstart the idle flushing bounded by innodb_io_capacity. (Thanks to Marko Makela for reviewing the patch and idea right from the its inception).
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