linux-kernel - Re: x86 patches was Re: -mm merge plans for 2.6.24

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Message-ID: <29495f1d0710020940o1278aca5h14d5daf89eb554f3@mail.gmail.com>
Date:	Tue, 2 Oct 2007 09:40:23 -0700
From:	"Nish Aravamudan" <nish.aravamudan@...il.com>
To:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Andi Kleen" <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	mpm@...enic.com, "Huang, Ying" <ying.huang@...el.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Christoph Lameter" <clameter@....com>, apw@...dowen.org,
	"Lee.Schermerhorn@...com" <Lee.Schermerhorn@...com>
Subject: Re: x86 patches was Re: -mm merge plans for 2.6.24

On 10/2/07, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> On Tue, 2 Oct 2007 00:18:09 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> > >
> > > > How come?  Memoryless node can and do occur in real-world machines.  Kernel
> > > > should support that?
> > >
> > > But a node is just defined by its memory?
> >
> > Don't think so.  A node is a lump of circuitry which can have zero or more
> > CPUs, IO and memory.
> >
> > It may initially have been conceived as a memory-only concept in the Linux
> > kernel, but that doesn't fully map onto reality (does it?)
> >
> > There was a real-world need for this, I think from the Fujitsu guys.  That
> > should be spelled out in the changelog but isn't.
>
> Yes, Fujitsu and HP guys really need this memory-less-node support.

Anton's post (http://marc.info/?l=linux-mm&m=118133042025995&w=2) (and
my subsequent reposts) may have helped prompt this full series, which
then was picked up and shown to be useful to other folks. NUMA systems
with memoryless nodes exist in the wild and Linux did not do the right
thing there. Admittedly, Anton's case is hugetlb-specific, but the fix
I've been proposing (and hope to repost soon) depends on Christoph's
patches, especially the THISNODE fix.

Thanks,
Nish
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