[PATCH] mm: shrink_inactive_lis() nr_scan accounting fix

In shrink_inactive_list(), nr_scan is not accounted when nr_taken is 0.
But 0 pages taken does not mean 0 pages scanned.

Move the goto statement below the accounting code to fix it.

Signed-off-by: Wu Fengguang <wfg@mail.ustc.edu.cn>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 85e95f445022..486184d2b50c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1132,9 +1132,6 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
                 zone->pages_scanned += nr_scan;
                 spin_unlock_irq(&zone->lru_lock);
 
-                if (nr_taken == 0)
-                        goto done;
-
                 nr_scanned += nr_scan;
                 nr_freed = shrink_page_list(&page_list, sc);
                 nr_reclaimed += nr_freed;
@@ -1146,6 +1143,9 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
                         __mod_page_state_zone(zone, pgscan_direct, nr_scan);
                 __mod_page_state_zone(zone, pgsteal, nr_freed);
 
+                if (nr_taken == 0)
+                        goto done;
+
                 spin_lock(&zone->lru_lock);
                 /*
                  * Put back any unfreeable pages.
@@ -1166,8 +1166,9 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
                         }
                 }
         } while (nr_scanned < max_scan);
-        spin_unlock_irq(&zone->lru_lock);
+        spin_unlock(&zone->lru_lock);
 done:
+        local_irq_enable();
         pagevec_release(&pvec);
         return nr_reclaimed;
 }