linux-kernel - Re: [2.6.24-rc8-mm1][regression?] numactl --interleave=all doesn't works on memoryless node.

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Message-ID: <20080205143149.GA4207@csn.ul.ie>
Date:	Tue, 5 Feb 2008 14:31:50 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Paul Jackson <pj@....com>, David Rientjes <rientjes@...gle.com>
Subject: Re: [2.6.24-rc8-mm1][regression?] numactl --interleave=all doesn't works on memoryless node.

On (04/02/08 13:20), Lee Schermerhorn didst pronounce:
> > > When the kernel behaviour changes and breaks user space then the kernel
> > > is usually wrong. Cc'ed Lee S. who maintains the kernel code now.
> 
> The memoryless nodes patch series changed a lot of things, so just
> reverting this one area [mpol_check_policy()] probably won't restore the
> prior behavior.  A fully populated node mask is not necessarily a proper
> subset of node_online_map().  And contextualize_policy() also requires
> the mask to be a subset of mems_allowed which also defaults to nodes
> with memory.
> 
> I don't know how Mel Gorman's "two zonelist" series, which is still
> awaiting a window into the -mm tree, affects this behavior.  Those
> patches will certainly be affected by whatever we decide here.
> 

I doubt they'd make a difference to this particular problem.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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