[rvm-research] BlockAllocator Block Meta Data

Hello all,

         I had a question about the block meta data in the block allocator.
It seems like there is an entire word of meta data, but as far as I can
tell looking at markBlockMeta, checkBlockMeta, and clearBlockMeta
functions, only one bit is actually used.

         What I am trying to do is to keep the sweeper from collecting
certain objects (building off the Mark Sweep collector), and (in addition
to tracking the objects themselves) I think I need to "mark" their blocks
in a way that is not reset after each collection. So I'm trying to use a
bit of the block meta data to do this.

        Are the other 31 bits of block metadata up for grabs? Or are they
used in some way I haven't discovered?

           Thanks,
               Nathan Ricci
               Tufts University

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