linux-kernel - [PATCH] mm: add MM_SWAPENTS and page table when calculate tasksize in lowmem

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Date:	Tue, 16 Feb 2016 17:37:05 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<arve@...roid.com>, <riandrews@...roid.com>,
	<devel@...verdev.osuosl.org>, zhong jiang <zhongjiang@...wei.com>
CC:	LKML <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>
Subject: [PATCH] mm: add MM_SWAPENTS and page table when calculate tasksize
 in lowmem_scan()

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 <qiuxishi@...wei.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