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Subject[RFCv2 2/3] staging: ion: debugfs to shrink pool
Date
This patch creates debugfs files, /sys/kernel/debug/ion/heaps/system_shrink,
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@lge.com>
---
drivers/staging/android/ion/ion.c | 31 ++++++++-----------------------
1 file changed, 8 insertions(+), 23 deletions(-)

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 290d4d2..ecc1121 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

void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
{
@@ -1534,8 +1520,7 @@ 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);
@@ -1550,7 +1535,7 @@ 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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