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 <[email protected]> Cc: Yasuaki Ishimatsu <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
rtvt123 · Oct 9, 2012 · 1e8537b · 1e8537b
1 parent 38a7601
commit 1e8537b
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
@@ -970,8 +970,13 @@ static int __ref offline_pages(unsigned long start_pfn,
 
 	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);