linux-kernel - Re: [PATCH 0/18] Basic scheduler support for automatic NUMA balancing V5

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Date:	Thu, 1 Aug 2013 16:51:51 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/18] Basic scheduler support for automatic NUMA
 balancing V5

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
SUSE Labs
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