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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>
steinar/wifi_calib_4_9_kernel
Gioh Kim 2015-07-06 15:14:41 +09:00 committed by Greg Kroah-Hartman
parent b44d9ce3b8
commit aeb7fa7b4f
1 changed files with 9 additions and 13 deletions
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22
drivers/staging/android/ion/ion.c
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@ -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;
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 @@ 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);
}