linux-kernel - [PATCH] staging: android: lowmemorykiller: neglect swap cached pages in other

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Message-Id: <1393438506-2940-1-git-send-email-vinayakm.list@gmail.com>
Date:	Wed, 26 Feb 2014 23:45:06 +0530
From:	vinayakm.list@...il.com
To:	gregkh@...uxfoundation.org, arve@...roid.com,
	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org,
	Vinayak Menon <vinayakm.list@...il.com>
Subject: [PATCH] staging: android: lowmemorykiller: neglect swap cached pages in other_file

From: Vinayak Menon <vinayakm.list@...il.com>

With ZRAM enabled it is observed that lowmemory killer
doesn't trigger properly. swap cached pages are
accounted in NR_FILE, and lowmemorykiller considers
this as reclaimable and adds to other_file. But these
pages can't be reclaimed unless lowmemorykiller triggers.
So subtract swap pages from other_file.

Signed-off-by: Vinayak Menon <vinayakm.list@...il.com>
---
 drivers/staging/android/lowmemorykiller.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
index 6f094b3..9e931b2 100644
--- a/drivers/staging/android/lowmemorykiller.c
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -88,7 +88,8 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
 	int array_size = ARRAY_SIZE(lowmem_adj);
 	int other_free = global_page_state(NR_FREE_PAGES) - totalreserve_pages;
 	int other_file = global_page_state(NR_FILE_PAGES) -
-						global_page_state(NR_SHMEM);
+						global_page_state(NR_SHMEM) -
+						total_swapcache_pages();
 
 	if (lowmem_adj_size < array_size)
 		array_size = lowmem_adj_size;
-- 
1.7.10.4

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