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. This technically enables debugfs
shrinking for all heaps, not just the system heap although the system heap
is the only one with a shrinker right now. 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@lge.com>
Reviewed-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 6c922c7..eec878e 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1466,7 +1466,6 @@
.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 @@
int objs;
sc.gfp_mask = -1;
- sc.nr_to_scan = 0;
+ sc.nr_to_scan = val;
- if (!val)
- return 0;
+ if (!val) {
+ objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
+ sc.nr_to_scan = objs;
+ }
- objs = heap->shrinker.shrink(&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 @@
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 @@
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 @@
path, debug_name);
}
}
-#endif
+
up_write(&dev->lock);
}