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

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Date:	Tue, 05 Feb 2008 10:23:37 -0500
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	Mel Gorman <mel@....ul.ie>
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 Tue, 2008-02-05 at 14:31 +0000, Mel Gorman wrote:
> 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.

I didn't really think so, but I wanted to give you a heads up regarding
this, as I think it will affect your patches.  I'm hoping we'll see them
in -mm soon after the .25 merge window closes.  If you get there before
a fix to this issue, so much the better, IMO :-).

Lee


> 

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