From: Xishi Qiu <qiuxishi@huawei.com>
Date: Mon, 8 Oct 2012 23:31:51 +0000 (-0700)
Subject: memory-hotplug: build zonelists when offlining pages
X-Git-Tag: v3.7-rc1~74^2~69
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=1e8537baacd59e96bbe5f8d3d32feafd11f509fe;p=~emulex%2Finfiniband.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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6a5b90d0cfd..b35016156c1 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);