linux-kernel - [PATCH 2/2] lowmemorykiller: Don't count free space unless it meets the specified limit by itself

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Message-Id: <1241475889-2281-2-git-send-email-arve@android.com>
Date:	Mon,  4 May 2009 15:24:49 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	linux-kernel@...r.kernel.org
Cc:	gregkh@...e.de, rientjes@...gle.com, akpm@...ux-foundation.org,
	npiggin@...e.de, san@...roid.com,
	Arve Hjønnevåg <arve@...roid.com>
Subject: [PATCH 2/2] lowmemorykiller: Don't count free space unless it meets the specified limit by itself

This allows processes to be killed when the kernel evict cache pages in
an attempt to get more contiguous free memory.

Signed-off-by: Arve Hjønnevåg <arve@...roid.com>
---
 drivers/staging/android/lowmemorykiller.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
index b9a2e84..b2ab7fa 100644
--- a/drivers/staging/android/lowmemorykiller.c
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -58,20 +58,25 @@ static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask)
 	int min_adj = OOM_ADJUST_MAX + 1;
 	int selected_tasksize = 0;
 	int array_size = ARRAY_SIZE(lowmem_adj);
-	int other_free = global_page_state(NR_FREE_PAGES) + global_page_state(NR_FILE_PAGES);
+	int other_free = global_page_state(NR_FREE_PAGES);
+	int other_file = global_page_state(NR_FILE_PAGES);
 	if(lowmem_adj_size < array_size)
 		array_size = lowmem_adj_size;
 	if(lowmem_minfree_size < array_size)
 		array_size = lowmem_minfree_size;
 	for(i = 0; i < array_size; i++) {
-		if(other_free < lowmem_minfree[i]) {
+		if (other_free < lowmem_minfree[i] &&
+		    other_file < lowmem_minfree[i]) {
 			min_adj = lowmem_adj[i];
 			break;
 		}
 	}
 	if(nr_to_scan > 0)
-		lowmem_print(3, "lowmem_shrink %d, %x, ofree %d, ma %d\n", nr_to_scan, gfp_mask, other_free, min_adj);
-	rem = global_page_state(NR_ACTIVE) + global_page_state(NR_INACTIVE);
+		lowmem_print(3, "lowmem_shrink %d, %x, ofree %d %d, ma %d\n", nr_to_scan, gfp_mask, other_free, other_file, min_adj);
+	rem = global_page_state(NR_ACTIVE_ANON) +
+		global_page_state(NR_ACTIVE_FILE) +
+		global_page_state(NR_INACTIVE_ANON) +
+		global_page_state(NR_INACTIVE_FILE);
 	if (nr_to_scan <= 0 || min_adj == OOM_ADJUST_MAX + 1) {
 		lowmem_print(5, "lowmem_shrink %d, %x, return %d\n", nr_to_scan, gfp_mask, rem);
 		return rem;
-- 
1.6.1

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