Swap delay accounting, include lock_page() delays

The delay incurred in lock_page() should also be accounted in swap delay
accounting

Reported-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 7b0403bfc97f..4bf0b6d0eb2a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2084,9 +2084,9 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 count_vm_event(PGMAJFAULT);
         }
 
-        delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
         mark_page_accessed(page);
         lock_page(page);
+        delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
 
         /*
          * Back out if somebody else already faulted in this pte.