mm: do_migrate_range: exit loop if not_managed is true

If not_managed is true all pages will be putback to lru, so break the loop
earlier to skip other pages isolate.

Signed-off-by: Bob Liu <lliubbo@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index bb63b36c4413..e4af144ee409 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -696,15 +696,17 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
                                             page_is_file_cache(page));
 
                 } else {
-                        /* Becasue we don't have big zone->lock. we should
-                           check this again here. */
-                        if (page_count(page))
-                                not_managed++;
 #ifdef CONFIG_DEBUG_VM
                         printk(KERN_ALERT "removing pfn %lx from LRU failed\n",
                                pfn);
                         dump_page(page);
 #endif
+                        /* Becasue we don't have big zone->lock. we should
+                           check this again here. */
+                        if (page_count(page)) {
+                                not_managed++;
+                                break;
+                        }
                 }
         }
         ret = -EBUSY;