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.4.64.0801231034110.11430@schroedinger.engr.sgi.com>
Date:	Wed, 23 Jan 2008 10:35:32 -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:

> I still think Christoph's kmem_getpages() patch is correct (to fix 
> cache_grow() oops) but I overlooked the fact that none the callers of 
> ____cache_alloc_node() deal with bootstrapping (with the exception of 
> __cache_alloc_node() that even has a comment about it).

My patch is useless. kmem_getpages called with nodeid == -1 falls back 
correctly to the available node. The problem is that the node structures 
for the page does not exist.
 
> But what I am really wondering about is, why wasn't the 
> N_NORMAL_MEMORY revert enough? I assume this used to work before so what 
> more do we need to revert for 2.6.24?

I think that is because SLUB relaxed the requirements on having regular 
memory on the boot node. Now the expectation is that SLAB can do the same.


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