linux-kernel - Re: [bug] SLUB + mm/slab.c boot crash in -rc9

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Message-ID: <Pine.LNX.4.64.0804151232080.1785@schroedinger.engr.sgi.com>
Date:	Tue, 15 Apr 2008 12:39:26 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Yinghai.Lu@....com
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9

On Tue, 15 Apr 2008, Linus Torvalds wrote:

> On Tue, 15 Apr 2008, Ingo Molnar wrote:
> > 
> > btw., now with a second full day spent on this regression, i have 
> > figured out a workaround the hard way: increasing SECTION_SIZE_BITS in 
> > include/asm-x86/sparsemem.h from 26 to 27 makes it go away.
> 
> Interesting.

Hmmmm. SECTION_SIZE_BITS == 26 means SECTIONS_SHIFT == 6. 
Increasing SECTION_SIZE_BITS to 27 reduces SECTION_SHIFT to 5. Thereby 
the number of sparsemem sections (NR_MEM_SECTIONS) is reduced to half (64 
to 32).
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