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Add some cache/memory statistics to help spot potential exhaustion and other tuning issues.
author Dan Creswell <dan.creswell@gmail.com>
date Fri, 28 Aug 2009 17:23:33 +0100
parents 3dc0c5604566
children
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Could we schedule I/O in such a fashion as to be outside of locks involved in
a deadlock situation?

Cache lock = sync() lock in ArcCache.
CBD lock is the individual mutex of a CBD.

What are the conditions for achieving this?

We must have done all cache list modifications before releasing the cache lock.
   - This ensures another thread doesn't, for example, recover a CBD with one
   id which, in fact, is being "renamed" to another id.
   - We must also do this to protect the state of the various lists which
   constitute a chunk of the cache state.  Question, is the state of a CDB's
   content part of the cache state?