From: Xishi Qiu <qiuxishi@huawei.com>
Date: Fri, 28 Sep 2012 00:19:36 +0000 (+1000)
Subject: memory-hotplug: build zonelists when offlining pages
X-Git-Tag: next-20120928~1^2~272
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f33eaf8e85d275b293c43c10cd837aa67d6dd763;p=karo-tx-linux.git

memory-hotplug: build zonelists when offlining pages

online_pages() does build_all_zonelists() and zone_pcp_update(), I think
offline_pages() should do it too.

When the zone has no memory to allocate, remove it from other nodes'
zonelists.  zone_batchsize() depends on zone's present pages, if zone's
present pages are changed, zone's pcp should be updated.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6a5b90d0cfd7..b35016156c19 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -970,8 +970,13 @@ repeat:
 
 	init_per_zone_wmark_min();
 
-	if (!populated_zone(zone))
+	if (!populated_zone(zone)) {
 		zone_pcp_reset(zone);
+		mutex_lock(&zonelists_mutex);
+		build_all_zonelists(NULL, NULL);
+		mutex_unlock(&zonelists_mutex);
+	} else
+		zone_pcp_update(zone);
 
 	if (!node_present_pages(node)) {
 		node_clear_state(node, N_HIGH_MEMORY);