All of the logging for oopstorage+blocks is currently at the debug level. There wasn't a lot of discussion when they were all moved from info to debug (JDK-8210724). That isn't ideal, as there is some that can be quite voluminous.

Looking through the current set more carefully, I suggest the following changes:

Make these all trace instead of debug:

- allocate: block transitions
- release: block transitions, deferred updates
- reduce_deferred_updates: processing an update

Make these info:

- allocate: allocation failures

Leave these debug:

- allocate: new block, expand active array
- delete_empty_block: deleting a block