On (02/08/07 17:14), Mel Gorman didst pronounce:
> On (02/08/07 09:44), KAMEZAWA Hiroyuki didst pronounce:
> > On Wed, 01 Aug 2007 15:02:51 -0400
> > Lee Schermerhorn <[email protected]> wrote:
> > > [But, maybe reordering the zonelists is not such a good idea
> > > when ZONE_MOVABLE is populated?]
> > >
> >
> > It's case-by-case I think. In zone order with ZONE_MOVABLE case,
> > user's page cache will not use ZONE_NORMAL until ZONE_MOVABLE in all node
> > is exhausted. This is an expected behavior, I think.
> >
>
> This is expected behaviour. I see no reason for lower zones to be used
> for allocations that use memory from a higher zone with free memory.
>
Bah. I should have thought of this better.
If you are using ZONE_MOVABLE and the zonelist is in zone order, one would
use memory from remote nodes when suitable local memory was available. I don't
have a quick answer on how this should be handled. The answer may be
something like;
o When ordering zonelists by nodes, order them so that the movable zone
is paired with the next highest zones in a zonelist before moving to the
next node
> > I think the real problem is the scheme for "How to set zone movable size to
> > appropriate value for the system". This needs more study and documentation.
> > (but maybe depends on system configuration to some extent.)
> >
>
> It depends on the system configuration and the workload requirements.
> Right now, there isn't exact information available on what size the zone
> should be. It'll need to be studied over a period of time.
>
> --
> Mel Gorman
> Part-time Phd Student Linux Technology Center
> University of Limerick IBM Dublin Software Lab
>
> --
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--
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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