On Mon, Jun 13, 2011 at 12:06:08PM +0900, KAMEZAWA Hiroyuki wrote: > added some clean ups. > == > >From 45b8881201f73015c4e0352eb7e434f6e9c53fdd Mon Sep 17 00:00:00 2001 > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > Date: Mon, 13 Jun 2011 10:09:17 +0900 > Subject: [PATCH 2/5] [BUGFIX] memcg: fix init_page_cgroup nid with sparsemem > > > commit 21a3c96 makes page_cgroup allocation as NUMA aware. But that caused > a problem https://bugzilla.kernel.org/show_bug.cgi?id=36192. > > The problem was getting a NID from invalid struct pages, which was not > initialized because it was out-of-node, out of [node_start_pfn, node_end_pfn) > > Now, with sparsemem, page_cgroup_init scans pfn from 0 to max_pfn. > But this may scan a pfn which is not on any node and can access > memmap which is not initialized. > > This makes page_cgroup_init() for SPARSEMEM node aware and remove > a code to get nid from page->flags. (Then, we'll use valid NID > always.) > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Acked-by: Johannes Weiner <jweiner@xxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>