Subject: Re: [2.6.24-rc8-mm1][regression?] numactl --interleave=all doesn't
	works on memoryless node.
From: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Andi Kleen <andi@firstfloor.org>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
       Christoph Lameter <clameter@sgi.com>, Paul Jackson <pj@sgi.com>,
       David Rientjes <rientjes@google.com>
In-Reply-To: <20080205143149.GA4207@csn.ul.ie>
References: <20080202165054.F491.KOSAKI.MOTOHIRO@jp.fujitsu.com>
	 <20080202090914.GA27723@one.firstfloor.org>
	 <20080202180536.F494.KOSAKI.MOTOHIRO@jp.fujitsu.com>
	 <1202149243.5028.61.camel@localhost>  <20080205143149.GA4207@csn.ul.ie>
Content-Type: text/plain
Organization: HP/OSLO
Date: Tue, 05 Feb 2008 10:23:37 -0500
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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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