RAM disk vs paging + buffer cache

[System Mangler]

In article <514 at opus.nbires.UUCP>, rcd at nbires.UUCP (Dick Dunn) writes:
> Instead of LRU on disk blocks and LRU on process-image pages, why not LRU
> on the whole mess.  There's a simplification lurking here--after all, the
> pages of images represent disk blocks too.  Has anyone tried fiddling with
> UNIX either to make the buffer cache size adaptive or to unify page
> management and buffer caching?

Didn't J. F. Rieser (spelling?) long ago implement a paging Unix
that used the buffer cache as a page pool?  Or was this just an
idea floating around that didn't get implemented?