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>

1 files changed, 6 insertions, 1 deletions

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);