linux-kernel - Re: [RFC Patch V1 00/30] Enable memoryless node on x86 platforms

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Message-ID: <20140711215837.GU18735@two.firstfloor.org>
Date:	Fri, 11 Jul 2014 23:58:37 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC Patch V1 00/30] Enable memoryless node on x86 platforms

On Fri, Jul 11, 2014 at 10:51:06PM +0200, Peter Zijlstra wrote:
> On Fri, Jul 11, 2014 at 01:20:51PM -0700, Andi Kleen wrote:
> > Greg KH <gregkh@...uxfoundation.org> writes:
> > 
> > > On Fri, Jul 11, 2014 at 10:29:56AM +0200, Peter Zijlstra wrote:
> > >> On Fri, Jul 11, 2014 at 03:37:17PM +0800, Jiang Liu wrote:
> > >> > Any comments are welcomed!
> > >> 
> > >> Why would anybody _ever_ have a memoryless node? That's ridiculous.
> > >
> > > I'm with Peter here, why would this be a situation that we should even
> > > support?  Are there machines out there shipping like this?
> > 
> > We've always had memory nodes.
> > 
> > A classic case in the old days was a two socket system where someone
> > didn't populate any DIMMs on the second socket.
> 
> That's a obvious; don't do that then case. Its silly.

True. We should recommend that anyone running Linux will email you
for approval of their configuration first.


> > There are other cases too.
> 
> Are there any sane ones

Yes.

-Andi
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