linux-kernel - Re: [PATCH][for -mm] per-zone and reclaim enhancements for memory controller take 3 [3/10] per-zone active inactive counter

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Date:	Thu, 29 Nov 2007 11:24:06 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"containers@...ts.osdl.org" <containers@...ts.osdl.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH][for -mm] per-zone and reclaim enhancements for memory
 controller take 3 [3/10] per-zone active inactive counter

On Thu, 29 Nov 2007 10:37:02 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> Maybe zonelists of NODE_DATA() is not initialized. you are right.
> I think N_HIGH_MEMORY will be suitable here...(I'll consider node-hotplug case later.)
> 
> Thank you for test!
> 
Could you try this ? 

Thanks,
-Kame
==

Don't call kmalloc() against possible but offline node.

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

 mm/memcontrol.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

Index: test-2.6.24-rc3-mm1/mm/memcontrol.c
===================================================================
--- test-2.6.24-rc3-mm1.orig/mm/memcontrol.c
+++ test-2.6.24-rc3-mm1/mm/memcontrol.c
@@ -1117,8 +1117,14 @@ static int alloc_mem_cgroup_per_zone_inf
 	struct mem_cgroup_per_node *pn;
 	struct mem_cgroup_per_zone *mz;
 	int zone;
-
-	pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node);
+	/*
+	 * This routine is called against possible nodes.
+	 * But it's BUG to call kmalloc() against offline node.
+	 */
+	if (node_state(N_ONLINE, node))
+		pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, node);
+	else
+		pn = kmalloc(sizeof(*pn), GFP_KERNEL);
 	if (!pn)
 		return 1;
 

-
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