memcg: fix lru rotation in isolate_pages
[linux-2.6.git] / mm / memcontrol.c
index 6ceb6f2..e2fa20d 100644 (file)
@@ -649,6 +649,7 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
        int zid = zone_idx(z);
        struct mem_cgroup_per_zone *mz;
        int lru = LRU_FILE * !!file + !!active;
+       int ret;
 
        BUG_ON(!mem_cont);
        mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
@@ -666,9 +667,19 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
                        continue;
 
                scan++;
-               if (__isolate_lru_page(page, mode, file) == 0) {
+               ret = __isolate_lru_page(page, mode, file);
+               switch (ret) {
+               case 0:
                        list_move(&page->lru, dst);
+                       mem_cgroup_del_lru(page);
                        nr_taken++;
+                       break;
+               case -EBUSY:
+                       /* we don't affect global LRU but rotate in our LRU */
+                       mem_cgroup_rotate_lru_list(page, page_lru(page));
+                       break;
+               default:
+                       break;
                }
        }