On Fri, Nov 18, 2022 at 08:09:52PM +0800, Jinlong Chen wrote: > elevator_switch contains the fallback logic in sq era, but it was removed > when moving to mq (commit: a1ce35fa49852db60fc6e268038530be533c5b15), > leaving the document mismatched with the behavior. As far as I can see, > restoring the old io scheduler is more reasonable than just leaving the > scheduler none, hence there is the series. What failure scenariou can you think off where switching to the intended schedule fails, but switching back to the previous one will succeed?
