linux-kernel - Re: [PATCH v3] mm: make expand_downwards symmetrical to expand

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Date:	Thu, 21 Apr 2011 11:37:27 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
 expand_upwards

On Thu, 2011-04-21 at 22:16 +0900, KOSAKI Motohiro wrote:
> > This should fix the remaining architectures so they can use CONFIG_SLUB, 
> > but I hope it can be tested by the individual arch maintainers like you 
> > did for parisc.
> 
> ia64 and mips have CONFIG_ARCH_POPULATES_NODE_MAP and it initialize
> N_NORMAL_MEMORY automatically if my understand is correct.
> (plz see free_area_init_nodes)
> 
> I guess alpha and m32r have no active developrs. only m68k seems to be need
> fix and we have a chance to get a review... 

Actually, it's not quite a fix yet, I'm afraid.  I've just been
investigating why my main 4 way box got slower with kernel builds:
Apparently userspace processes are now all stuck on CPU0, so we're
obviously tripping over some NUMA scheduling stuff that's missing.

James


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