linux-kernel - [PATCH] use __GFP_NOWARN in page cgroup allocation

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Date:	Wed, 4 Feb 2009 17:09:44 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	heiko.carstens@...ibm.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: [PATCH] use __GFP_NOWARN in page cgroup allocation

This was recommended in
"kmalloc-return-null-instead-of-link-failure.patch added to -mm tree" thread
in the last month.
Thanks,
-Kame
=
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

page_cgroup's page allocation at init/memory hotplug uses kmalloc() and
vmalloc(). If kmalloc() failes, vmalloc() is used.

This is because vmalloc() is very limited resource on 32bit systems.
We want to use kmalloc() first.

But in this kind of call, __GFP_NOWARN should be specified.

Reported-by: Heiko Carstens <heiko.carstens@...ibm.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
Index: mmotm-2.6.29-Feb03/mm/page_cgroup.c
===================================================================
--- mmotm-2.6.29-Feb03.orig/mm/page_cgroup.c
+++ mmotm-2.6.29-Feb03/mm/page_cgroup.c
@@ -114,7 +114,8 @@ static int __init_refok init_section_pag
 		nid = page_to_nid(pfn_to_page(pfn));
 		table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
 		if (slab_is_available()) {
-			base = kmalloc_node(table_size, GFP_KERNEL, nid);
+			base = kmalloc_node(table_size,
+					GFP_KERNEL | __GFP_NOWARN, nid);
 			if (!base)
 				base = vmalloc_node(table_size, nid);
 		} else {

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