Re: [RFC] 0/4 Migration Cache Overview

Christoph Lameter
2006-02-21T19:19:58Z

On Tue, 21 Feb 2006, Lee Schermerhorn wrote:

> Are the swap ptes used for migrating pages still reserving swap space on
> real swap devices? I thought this was what the migration cache was
> trying to avoid. Now each running instance of direct migration limits
> itself to MIGRATE_CHUNK_SIZE [currently] 256 pages, so if the system has
> much swap space at all, this shouldn't place too much of a load on swap
> space. But, it does require that one have SOME swap space to migrate,
> right?

Right. If the kernel configured to not include swap functionality then the
kernel will not include page migration capabilities.