From: Bob Liu <lliubbo@gmail.com>
Date: Tue, 26 Oct 2010 21:22:10 +0000 (-0700)
Subject: mm: do_migrate_range: exit loop if not_managed is true
X-Git-Tag: firefly_0821_release~7613^2~3628^2~102
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=809c444977adb7313e0612e9e3af4b73ba3f5746;p=firefly-linux-kernel-4.4.55.git

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>
---

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;