linux-kernel - Re: [git pull] m68k SLUB fix for 2.6.39

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Date:	Mon, 09 May 2011 17:24:04 -0500
From:	James Bottomley <James.Bottomley@...e.de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux.com>, linux-m68k@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [git pull] m68k SLUB fix for 2.6.39

On Wed, 2011-05-04 at 12:07 -0700, David Rientjes wrote:
> On Wed, 4 May 2011, James Bottomley wrote:
> 
> > Yes, but I also encountered it after I applied you patch, which is why I
> > still pushed the Kconfig patch.  It's possible, since there were a huge
> > number of patches flying around that the kernel base was contaminated,
> > so I'll strip down to just linus HEAD + parisc coherence patches,
> > reverting the Kconfig one and try again.
> > 
> 
> Great, and if that works out successfully this time around I think we'll 
> either need to fix each individual arch Kconfig that we know doesn't work 
> well (at least parisc because of the scheduling issue) so that it at least 
> enables CONFIG_NUMA implicitly for discontigmem unless CONFIG_BROKEN is 
> set.

OK, I confirm that the N_NORMAL_MEMORY patch on its own fixes slub for
us.  We can revert the mark slub BROKEN in DISCONTIGMEM && !NUMA patch.

> The ideal solution is probably to rely on CONFIG_NEED_MULTIPLE_NODES 
> rather than CONFIG_NUMA, which is why it was introduced in the first place 
> since it was duplicating data structures for both NUMA and discontigmem.  
> That's apparently broken somewhere in the kernel that turned your SMP box 
> into an UP.

Sure ... either that or accelerate a conversion to something like
SPARSEMEM.

James


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