On Wed, 2017-05-31 at 12:28 +0900, Hirokazu Honda wrote: > If I understand a bitmap correctly, it is necessary to change the log level > for each message. > I didn't mean a bitmap will take a long CPU time. > I mean the work to change so takes a long time. No, none of the messages or levels need change, only the >= test changes to & so that for instance, level 1 and level 3 messages could be emitted without also emitting level 2 messages. The patch suggested is all that would be required.