On Tue, 16 Feb 1999 16:09:54 -0500 (EST) 
 "Charles M. Hannum" <root@ihack.net> wrote:

 > One thing to note is that, since PT_WRITE_[ID] is actually done in the
 > debugger process now (rather than switching to the inferior process,
 > as in the old mechanism), the constraints are a little different.  It
 > occurs to me now that this behavior could cause a significant slowdown
 > on platforms using a VAC; mapping the page into the kernel will cause
 > an alias and therefore disable caching, but I don't think unmapping it
 > will will reenable caching in all of the pmaps.

It does in the MIPS and hp300 pmaps, at least.

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>