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Date: Wed, 29 Oct 2014 14:36:00 +0900
From: Gioh Kim <gioh.kim@....com>
To: gregkh@...uxfoundation.org, john.stultz@...aro.org,
rebecca@...roid.com, lauraa@...eaurora.org,
dan.carpenter@...cle.com, minchan@...nel.org,
iamjoonsoo.kim@....com
Cc: devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
gunho.lee@....com, Gioh Kim <gioh.kim@....com>
Subject: [PATCHv2 3/3] staging: ion: debugfs to shrink pool
This patch enables debugfs files /sys/kernel/debug/ion/heaps/system_shrink
,which was commented out, to shrink pool or get pool size
Reading the file returns pool size and writing occurs to shrink pool.
Signed-off-by: Gioh Kim <gioh.kim@....com>
---
drivers/staging/android/ion/ion.c | 31 +++++++--------------------
drivers/staging/android/ion/ion_page_pool.c | 5 ++++-
2 files changed, 12 insertions(+), 24 deletions(-)
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 036e29b..4879076 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1463,43 +1463,29 @@ 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;
- struct shrink_control sc;
int objs;
- sc.gfp_mask = -1;
- sc.nr_to_scan = 0;
-
- if (!val)
- return 0;
-
- objs = heap->shrinker.shrink(&heap->shrinker, &sc);
- sc.nr_to_scan = objs;
+ if (val)
+ objs = val;
+ else
+ objs = heap->ops->shrink(heap, __GFP_HIGHMEM, 0);
- heap->shrinker.shrink(&heap->shrinker, &sc);
+ (void)heap->ops->shrink(heap, __GFP_HIGHMEM, objs);
return 0;
}
static int debug_shrink_get(void *data, u64 *val)
{
struct ion_heap *heap = data;
- struct shrink_control sc;
- int objs;
-
- sc.gfp_mask = -1;
- sc.nr_to_scan = 0;
-
- objs = heap->shrinker.shrink(&heap->shrinker, &sc);
- *val = objs;
+ *val = heap->ops->shrink(heap, __GFP_HIGHMEM, 0);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
debug_shrink_set, "%llu\n");
-#endif
extern int pool_limit;
extern const int num_orders;
@@ -1553,8 +1539,7 @@ 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->ops->shrink) {
char debug_name[64];
snprintf(debug_name, 64, "%s_shrink", heap->name);
@@ -1581,7 +1566,7 @@ void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
path, debug_name);
}
}
-#endif
+
up_write(&dev->lock);
}
diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
index 15d1ac8..c473c2a 100644
--- a/drivers/staging/android/ion/ion_page_pool.c
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -25,6 +25,9 @@
#include <linux/kconfig.h>
#include "ion_priv.h"
+/* limit number of pages each pool can have */
+int pool_limit;
+
static void *ion_page_pool_alloc_pages(struct ion_page_pool *pool)
{
struct page *page = alloc_pages(pool->gfp_mask, pool->order);
@@ -54,7 +57,7 @@ static int ion_page_pool_total(struct ion_page_pool *pool, bool high)
static int ion_page_pool_add(struct ion_page_pool *pool, struct page *page)
{
- if (CONFIG_ION_POOL_LIMIT && ion_page_pool_total(pool, 1) > POOL_LIMIT)
+ if (pool_limit && ion_page_pool_total(pool, 1) > pool_limit)
return 1;
mutex_lock(&pool->mutex);
--
1.7.9.5
--
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