Re: [PATCH 0/18] Basic scheduler support for automatic NUMAbalancing V5

From: Mel Gorman
Date: Thu Aug 01 2013 - 11:52:01 EST

On Wed, Jul 31, 2013 at 06:39:03PM +0200, Peter Zijlstra wrote:
> On Wed, Jul 31, 2013 at 05:11:41PM +0100, Mel Gorman wrote:
> > RSS was another option it felt as arbitrary as a plain delay.
> Right, it would avoid 'small' programs getting scanning done with the
> rationale that their cost isn't that large since they don't have much
> memory to begin with.

Yeah, but it's not necessarily true. Whatever value we pick there can be
an openmp process that fits in there.

> The same can be said for tasks that don't run much -- irrespective of
> how much absolute runtime they've gathered.
> Is there any other group of tasks that we do not want to scan?

strcmp(p->comm, ....)

> Maybe if we can list all the various exclusions we can get to a proper
> quantifier that way.
> So far we've got:
> - doesn't run long
> - doesn't run much
> - doesn't have much memory

- does not have sysV shm sections

> > Should I revert 5bca23035391928c4c7301835accca3551b96cc2 with an
> > explanation that it potentially is completely useless in the purely
> > multi-process shared case?
> Yeah I suppose so..

Will do.

Mel Gorman
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