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Re: proxy memory objects patch

From: Marcus Brinkmann
Subject: Re: proxy memory objects patch
Date: Wed, 4 Dec 2002 00:07:23 +0100
User-agent: Mutt/1.4i

On Tue, Dec 03, 2002 at 11:29:46PM +0100, Marcus Brinkmann wrote:
> > In general I don't think the kernel should do a lot of work to make the
> > interface easier for the caller, but the other way around.  So special
> > cases for the last element and so forth are questionable.  
> I think it is important to make the last element open ended, because of the
> possibility of resizing files.  If a file is grown, I think you should be
> able to map the grown area from the proxy object you already got without
> calling io_map again.  This keeps a read only proxy object for a file in
> sync with the writable object if it changes size.  But maybe I am thinking
> wrong about resizing of memory objects, I never really looked into the
> extensions you did to make it possible.

Maybe this can be done by using (vm_size_t) -1 (ie, 0xffffffff) as
length/end argument, rather than by omitting it?  This seems to me to mean
the right thing in a natural way.


`Rhubarb is no Egyptian god.' GNU      http://www.gnu.org    marcus@gnu.org
Marcus Brinkmann              The Hurd http://www.gnu.org/software/hurd/

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