[PATCH]mm:Correctly update number of rotated pages on active list.

[Pradeep Goswami (Pradeep Kumar Goswami)]

This patch corrects the number of pages which are rotated on active list.
The counter for rotated pages effects the number of pages
to be scanned on active pages list in  low memory situations.

Signed-off-by: Pradeep Goswami <pradeep.goswami@xxxxxxxxxxxxx>
Cc: Rebecca Schultz Zavin <rebecca@xxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/vmscan.c       2015-11-18 20:55:38.208838142 +0800
+++ b/mm/vmscan.c       2015-11-19 14:37:31.189838998 +0800
@@ -1806,7 +1806,6 @@ static void shrink_active_list(unsigned
 
                if (page_referenced(page, 0, sc->target_mem_cgroup,
                                    &vm_flags)) {
-                       nr_rotated += hpage_nr_pages(page);
                        /*  
                         * Identify referenced, file-backed active pages and 
                         * give them one more trip around the active list. So
@@ -1818,6 +1817,7 @@ static void shrink_active_list(unsigned
                         */  
                        if ((vm_flags & VM_EXEC) && page_is_file_cache(page)) {
                                list_add(&page->lru, &l_active);
+                               nr_rotated += hpage_nr_pages(page);
                                continue;
                        }   
                }   

Thanks,
Pradeep.--
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