linux-kernel - Re: [memcg BUG ?] failed to boot on IA64 with CONFIG

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Message-Id: <20081205122024.3fcc1d0e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 5 Dec 2008 12:20:24 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [memcg BUG ?] failed to boot on IA64 with CONFIG_DISCONTIGMEM=y

On Fri, 05 Dec 2008 11:09:29 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> Kernel version: 2.6.28-rc7
> Arch: IA64
> Memory model: DISCONTIGMEM
> 
> ELILO boot: Uncompressing Linux... done
> Loading file initrd-2.6.28-rc7-lizf.img...done
> (frozen)
> 
> 
> Booted successfully with cgroup_disable=memory, here is the dmesg:
> 

thx, will dig into...Maybe you're the first person using DISCONTIGMEM with
empty_node after page_cgroup-alloc-at-boot.

How about this ?
-Kame
==

From: kamezawa.hiroyu@...fujitsu.com

page_cgroup should ignore empty-nodes.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

---
 mm/page_cgroup.c |    3 +++
 1 file changed, 3 insertions(+)

Index: mmotm-2.6.28-Dec03/mm/page_cgroup.c
===================================================================
--- mmotm-2.6.28-Dec03.orig/mm/page_cgroup.c
+++ mmotm-2.6.28-Dec03/mm/page_cgroup.c
@@ -51,6 +51,9 @@ static int __init alloc_node_page_cgroup
 	start_pfn = NODE_DATA(nid)->node_start_pfn;
 	nr_pages = NODE_DATA(nid)->node_spanned_pages;
 
+	if (!nr_pages)
+		return;
+
 	table_size = sizeof(struct page_cgroup) * nr_pages;
 
 	base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),

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