Re: UVM aobj: Large VM objects.

[Pavel Cahyna <pcah8322%artax.karlin.mff.cuni.cz@localhost>]

On Mon, Mar 06, 2006 at 05:56:22PM +0900, YAMAMOTO Takashi wrote:
> > On Mon, Mar 06, 2006 at 05:32:48PM +0900, YAMAMOTO Takashi wrote:
> > > (although i doubt kernel_object really need to cover the entire region,)
> > > making aobj 64-bit offset clean is a good idea.
> > > 
> > > however, i don't think long is appropriate here.
> > > please introduce a 64-bit "page offset" type.
> > > "typedef voff_t pgoff_t" should be fine.
> > 
> > Won't this make 32-bit ports slower?
> 
> which part of code are you talking about?

The original proposal was to make the u_pages member long. Are you
proposing to make it a 64-bit type, or did I misunderstand something? And
aren't 64-bit operations on 32-bit cpus slow?

Pavel Cahyna