linux-kernel - Re: [PATCH] Fix boot problem in situations where the boot CPU is running on a memoryless node

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Message-ID: <Pine.LNX.4.64.0801231036440.11430@schroedinger.engr.sgi.com>
Date:	Wed, 23 Jan 2008 10:51:32 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
cc:	Mel Gorman <mel@....ul.ie>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	hanth Aravamudan <nacc@...ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	lee.schermerhorn@...com, Linux MM <linux-mm@...ck.org>,
	Olaf Hering <olaf@...fle.de>
Subject: Re: [PATCH] Fix boot problem in situations where the boot CPU is
 running on a memoryless node

On Wed, 23 Jan 2008, Pekka J Enberg wrote:

> Fine. But, why are we hitting fallback_alloc() in the first place? It's 
> definitely not because of missing ->nodelists as we do:
> 
>         cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE];
> 
> before attempting to set up kmalloc caches. Now, if I understood 
> correctly, we're booting off a memoryless node so kmem_getpages() will 
> return NULL thus forcing us to fallback_alloc() which is unavailable at 
> this point.
> 
> As far as I can tell, there are two ways to fix this:
> 
>   (1) don't boot off a memoryless node (why are we doing this in the first 
>       place?)

Right. That is the solution that I would prefer.

>   (2) initialize cache_cache.nodelists with initmem_list3 equivalents
>       for *each node hat has normal memory*

Or simply do it for all. SLAB bootstrap is very complex thing though.

> 
> I am still wondering why this worked before, though.

I doubt it did ever work for SLAB.

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