[PATCH] mm: add MM_SWAPENTS and page table when calculate tasksize in lowmem_scan()

[Xishi Qiu]

Currently tasksize in lowmem_scan() only calculate rss, and not include swap.
But usually smart phones enable zram, so swap space actually use ram.

Signed-off-by: Xishi Qiu <qiuxi...@huawei.com>
---
 drivers/staging/android/lowmemorykiller.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/android/lowmemorykiller.c 
b/drivers/staging/android/lowmemorykiller.c
index 8b5a4a8..718ab8e 100644
--- a/drivers/staging/android/lowmemorykiller.c
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -139,7 +139,10 @@ static unsigned long lowmem_scan(struct shrinker *s, 
struct shrink_control *sc)
                        task_unlock(p);
                        continue;
                }
-               tasksize = get_mm_rss(p->mm);
+               tasksize = get_mm_rss(p->mm) +
+                          get_mm_counter(p->mm, MM_SWAPENTS) +
+                          atomic_long_read(&p->mm->nr_ptes) +
+                          mm_nr_pmds(p->mm);
                task_unlock(p);
                if (tasksize <= 0)
                        continue;
-- 
1.8.3.1