ementation, in this
case the one in Xerox PCR.
<LI>
(<TT>DEFAULT_VDB</tt>) By treating all pages as dirty.  This is the default if 
none of the other techniques is known to be usable, and
<TT>GC_malloc_stubborn</tt> is not used.  Practical only for testing, or if
the vast majority of objects use <TT>GC_malloc_stubborn</tt>.
</ol>

<H2>Black-listing</h2>

The collector implements <I>black-listing</i> of pages, as described
in
<A HREF="http://www.acm.org/pubs/citations/proceedings/pldi/155090/p197-boehm/">
Bo