Date: Fri, 11 Jul 2014 23:58:37 +0200
From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>, Greg KH <gregkh@linuxfoundation.org>,
        Jiang Liu <jiang.liu@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>, David Rientjes <rientjes@google.com>,
        Mike Galbraith <umgwanakikbuti@gmail.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Tony Luck <tony.luck@intel.com>, linux-mm@kvack.org,
        linux-hotplug@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC Patch V1 00/30] Enable memoryless node on x86 platforms
Message-ID: <20140711215837.GU18735@two.firstfloor.org>
References: <1405064267-11678-1-git-send-email-jiang.liu@linux.intel.com>
 <20140711082956.GC20603@laptop.programming.kicks-ass.net>
 <20140711153314.GA6155@kroah.com>
 <8761j3ve8s.fsf@tassilo.jf.intel.com>
 <20140711205106.GB20603@laptop.programming.kicks-ass.net>
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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@linuxfoundation.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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