linux-kernel - [PATCHv3 2/2] staging: ion: debugfs to shrink pool

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Message-Id: <1435748578-6400-3-git-send-email-gioh.kim@lge.com>
Date:	Wed,  1 Jul 2015 20:02:58 +0900
From:	Gioh Kim <gioh.kim@....com>
To:	gregkh@...uxfoundation.org, arve@...roid.com,
	riandrews@...roid.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Cc:	Gioh Kim <gioh.kim@....com>
Subject: [PATCHv3 2/2] staging: ion: debugfs to shrink pool

This patch enables debugfs file /sys/kernel/debug/ion/heaps/system_shrink
to shrink pool and get pool size. It is already implemented
but not complete. This patch completes and enables it.

Reading the file returns pool size
in page unit and writing the number of pages shrinks pool.
It flushes all pages to write zero at the file.

Signed-off-by: Gioh Kim <gioh.kim@....com>
---
 drivers/staging/android/ion/ion.c |   22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 6f48112..9327e8a 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1466,7 +1466,6 @@ static const struct file_operations debug_heap_fops = {
 	.release = single_release,
 };
 
-#ifdef DEBUG_HEAP_SHRINKER
 static int debug_shrink_set(void *data, u64 val)
 {
 	struct ion_heap *heap = data;
@@ -1474,15 +1473,14 @@ static int debug_shrink_set(void *data, u64 val)
 	int objs;
 
 	sc.gfp_mask = -1;
-	sc.nr_to_scan = 0;
-
-	if (!val)
-		return 0;
+	sc.nr_to_scan = val;
 
-	objs = heap->shrinker.shrink(&heap->shrinker, &sc);
-	sc.nr_to_scan = objs;
+	if (!val) {
+		objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
+		sc.nr_to_scan = objs;
+	}
 
-	heap->shrinker.shrink(&heap->shrinker, &sc);
+	heap->shrinker.scan_objects(&heap->shrinker, &sc);
 	return 0;
 }
 
@@ -1495,14 +1493,13 @@ static int debug_shrink_get(void *data, u64 *val)
 	sc.gfp_mask = -1;
 	sc.nr_to_scan = 0;
 
-	objs = heap->shrinker.shrink(&heap->shrinker, &sc);
+	objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
 	*val = objs;
 	return 0;
 }
 
 DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
 			debug_shrink_set, "%llu\n");
-#endif
 
 void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
 {
@@ -1540,8 +1537,7 @@ void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
 			path, heap->name);
 	}
 
-#ifdef DEBUG_HEAP_SHRINKER
-	if (heap->shrinker.shrink) {
+	if (heap->shrinker.count_objects && heap->shrinker.scan_objects) {
 		char debug_name[64];
 
 		snprintf(debug_name, 64, "%s_shrink", heap->name);
@@ -1556,7 +1552,7 @@ void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
 				path, debug_name);
 		}
 	}
-#endif
+
 	up_write(&dev->lock);
 }
 
-- 
1.7.9.5

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