[RFC] Proposal of marker implementation

[Frank Ch. Eigler]

Hi -

> I discussed this idea and your question in Hitachi, and I
> decide to shelve it, because realizing this idea is not easy
> on the other arch, and there are no proofs of big advantages.
> 
> I just minded the overhead of current approach [...]

I understand.  Thank you for thinking of these other methods.
In time, we may include several of the ideas in the code.

- FChE