Re: [PATCH 2/2] Add mem_type in /syfs to show memblock migrate type

[mel@skynet.ie (Mel Gorman)]

On (26/10/07 08:52), Dave Hansen didst pronounce:
> On Fri, 2007-10-26 at 10:50 +0100, Mel Gorman wrote:
> > I think that's overkill, especially as any awkward page would give the
> > section a score of 0. 
> 
> But, if we have a choice, shouldn't we go for a section that is
> completely free instead of one that has pages that need some kind of
> reclaim first?
> 

I would think that if memory is being shrunk in the system, the monitoring
software would not particularly care. If you think that might be the case,
then rename mem_removable to mem_removable_score and have it print out 0 or
1 for the moment based on the current criteria. Tell userspace developers
that the higher the score, the more suitable it is for removing.  That will
allow the introduction of a proper scoring mechanism later if there is a
good reason for it without breaking backwards compatability.

> We also don't have to have awkward pages keep giving a 0 score, as long
> as we have _some_ way of reclaiming them.  If we can't reclaim them,
> then I think it *needs* to be 0.
> 
> -- Dave
> 
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-- 
-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab

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