Re: about page migration on UMA

Jared Hulbert
2007-11-09T19:31:05Z

On 10/18/07, Christoph Lameter <clameter@sgi.com> wrote:
> On Wed, 17 Oct 2007, Jacky(GuangXiang Lee) wrote:
>
> > seems page migration is used mostly for NUMA platform to improve
> > performance.
> > But in a UMA architecture, Is it possible to use page migration to move
> > pages ?
>
> Yes. Just one up with a usage for it. The page migration mechanism itself
> is not NUMA dependent.

For extreme low power systems it would be possible to shut down banks
in SDRAM chips that were not full thereby saving power. That would
require some defraging and migration to empty them prior to powering
down those banks.