This patch limits pool size by page unit.
And enable a debugfs file to set limit.
Change-Id: Idaef4daa69084e8ec0844ecefc6738afeab79ccb
Signed-off-by: Gioh Kim <gioh.kim@xxxxxxx>
---
drivers/staging/android/ion/ion.c | 31 +++++++++++++++++++++++++
drivers/staging/android/ion/ion_page_pool.c | 24 +++++++++++--------
drivers/staging/android/ion/ion_system_heap.c | 2 +-
3 files changed, 46 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 290d4d2..036e29b 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1501,6 +1501,25 @@ DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
debug_shrink_set, "%llu\n");
#endif
+extern int pool_limit;
+extern const int num_orders;
+
+static int debug_limit_set(void *data, u64 val)
+{
+ /* val is kb unit, pool_limit is for page limit of individual pool */
+ pool_limit = (int)(val / PAGE_SIZE) / num_orders;
+ return 0;
+}
+
+static int debug_limit_get(void *data, u64 *val)
+{
+ *val = pool_limit * PAGE_SIZE * num_orders;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(debug_limit_fops, debug_limit_get,
+ debug_limit_set, "%llu\n");
+
void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
{
struct dentry *debug_file;
@@ -1549,6 +1568,18 @@ void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
path, debug_name);
}
+
+ snprintf(debug_name, 64, "%s_limit", heap->name);
+ debug_file = debugfs_create_file(
+ debug_name, 0644, dev->heaps_debug_root, heap,
+ &debug_limit_fops);
+ if (!debug_file) {
+ char buf[256], *path;
+
+ path = dentry_path(dev->heaps_debug_root, buf, 256);
+ pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
+ 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 165152f..15d1ac8 100644
--- a/drivers/staging/android/ion/ion_page_pool.c
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -22,6 +22,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/swap.h>
+#include <linux/kconfig.h>
#include "ion_priv.h"
static void *ion_page_pool_alloc_pages(struct ion_page_pool *pool)
@@ -41,8 +42,21 @@ static void ion_page_pool_free_pages(struct ion_page_pool *pool,
__free_pages(page, pool->order);
}
+static int ion_page_pool_total(struct ion_page_pool *pool, bool high)
+{
+ int count = pool->low_count;
+
+ if (high)
+ count += pool->high_count;
+
+ return count << pool->order;
+}
+
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)
+ return 1;
+
mutex_lock(&pool->mutex);
if (PageHighMem(page)) {
list_add_tail(&page->lru, &pool->high_items);
@@ -103,16 +117,6 @@ void ion_page_pool_free(struct ion_page_pool *pool, struct page *page)
ion_page_pool_free_pages(pool, page);
}
-static int ion_page_pool_total(struct ion_page_pool *pool, bool high)
-{
- int count = pool->low_count;
-
- if (high)
- count += pool->high_count;
-
- return count << pool->order;
-}
-
int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
int nr_to_scan)
{
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index 0ba8aaf..d6c0acd 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -30,7 +30,7 @@ static gfp_t high_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN |
__GFP_NORETRY) & ~__GFP_WAIT;
static gfp_t low_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN);
static const unsigned int orders[] = {4, 3, 2, 0};
-static const int num_orders = ARRAY_SIZE(orders);
+const int num_orders = ARRAY_SIZE(orders);
static int order_to_index(unsigned int order)
{
int i;
--
1.7.9.5
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