Subject: Re: CVS commit: syssrc
To: Chris G. Demetriou <firstname.lastname@example.org>
From: Jason R Thorpe <email@example.com>
Date: 09/21/2000 14:15:13
On Thu, Sep 21, 2000 at 11:58:28AM -0700, Chris G. Demetriou wrote:
> this is kind-of a bummer. on the mips, for instance, it means that
> you can't just #define PMAP_PAGEIDLEZERO to use pmap_zero_page(),
> which is good for some systems on which uncached accesses are Bad but
> on which is really is pretty much OK to zero pages anyway.
On such a MIPS machine, you can just not define PMAP_PAGEIDLEZERO; take a
look at the code in uvm_page.c.
> I suppose you can do a more complicated #define, but it's still a bit
> of a PITA, and kinda makes me think that this was a
> less-than-completely-thought out change, and could have used
> additional (any?) discussion...
Well, it was made after a discussion w/ chuq silvers who idenfied the
need to bail out early of slow page zeroing.
-- Jason R. Thorpe <firstname.lastname@example.org>