[RFC v9 PATCH 21/21] memory-hotplug: auto offline page_cgroup when onlining memory block failed

wency at cn.fujitsu.com wency at cn.fujitsu.com
Wed Sep 5 19:25:55 EST 2012


From: Wen Congyang <wency at cn.fujitsu.com>

When a memory block is onlined, we will try allocate memory on that node
to store page_cgroup. If onlining the memory block failed, we don't
offline the page cgroup, and we have no chance to offline this page cgroup
unless the memory block is onlined successfully again. It will cause
that we can't hot-remove the memory device on that node, because some
memory is used to store page cgroup. If onlining the memory block
is failed, there is no need to stort page cgroup for this memory. So
auto offline page_cgroup when onlining memory block failed.

CC: David Rientjes <rientjes at google.com>
CC: Jiang Liu <liuj97 at gmail.com>
CC: Len Brown <len.brown at intel.com>
CC: Benjamin Herrenschmidt <benh at kernel.crashing.org>
CC: Paul Mackerras <paulus at samba.org>
CC: Christoph Lameter <cl at linux.com>
Cc: Minchan Kim <minchan.kim at gmail.com>
CC: Andrew Morton <akpm at linux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motohiro at jp.fujitsu.com>
CC: Yasuaki Ishimatsu <isimatu.yasuaki at jp.fujitsu.com>
Signed-off-by: Wen Congyang <wency at cn.fujitsu.com>
---
 mm/page_cgroup.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 5ddad0c..44db00e 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -251,6 +251,9 @@ static int __meminit page_cgroup_callback(struct notifier_block *self,
 				mn->nr_pages, mn->status_change_nid);
 		break;
 	case MEM_CANCEL_ONLINE:
+		offline_page_cgroup(mn->start_pfn,
+				mn->nr_pages, mn->status_change_nid);
+		break;
 	case MEM_GOING_OFFLINE:
 		break;
 	case MEM_ONLINE:
-- 
1.7.1



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