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

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Message-ID: <20080415202805.GA26880@elte.hu>
Date:	Tue, 15 Apr 2008 22:28:05 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
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,
	apw@...dowen.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9


* Ingo Molnar <mingo@...e.hu> wrote:

> - we have a special loop for highmem pages in arch/x86/mm/init_32.c,
>   set_highmem_pages_init(). This just goes through the PFNs one by one 
>   and does an explicit __free_page() on all RAM pages that are in the 
>   mem_map[] and which are non-reserved.
> 
> and that's it roughly.

btw., highmem shouldnt matter because it does not influence how we 
allocate our key data structures.

i confirmed that by turning set_highmem_pages_init() into a NOP - the 
kernel still crashed with just lowmem memory being around.

	Ingo
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