Useful for testing.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_pool.c | 50 ++++++++++++++++++++++------------
1 file changed, 32 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 1d61e8fc0e81..1cdacd58753a 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -529,6 +529,28 @@ void ttm_pool_fini(struct ttm_pool *pool)
}
EXPORT_SYMBOL(ttm_pool_fini);
+/* As long as pages are available make sure to release at least one */
+static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ unsigned long num_freed = 0;
+
+ do
+ num_freed += ttm_pool_shrink();
+ while (!num_freed && atomic_long_read(&allocated_pages));
+
+ return num_freed;
+}
+
+/* Return the number of pages available or SHRINK_EMPTY if we have none */
+static unsigned long ttm_pool_shrinker_count(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ unsigned long num_pages = atomic_long_read(&allocated_pages);
+
+ return num_pages ? num_pages : SHRINK_EMPTY;
+}
+
#ifdef CONFIG_DEBUG_FS
/* Count the number of pages available in a pool_type */
static unsigned int ttm_pool_type_count(struct ttm_pool_type *pt)
@@ -633,29 +655,19 @@ int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m)
}
EXPORT_SYMBOL(ttm_pool_debugfs);
-#endif
-
-/* As long as pages are available make sure to release at least one */
-static unsigned long ttm_pool_shrinker_scan(struct shrinker *shrink,
- struct shrink_control *sc)
+/* Test the shrinker functions and dump the result */
+static int ttm_pool_debugfs_shrink_show(struct seq_file *m, void *data)
{
- unsigned long num_freed = 0;
+ struct shrink_control sc = { .gfp_mask = GFP_KERNEL };
- do
- num_freed += ttm_pool_shrink();
- while (!num_freed && atomic_long_read(&allocated_pages));
+ seq_printf(m, "%lu/%lu\n", ttm_pool_shrinker_count(&mm_shrinker, &sc),
+ ttm_pool_shrinker_scan(&mm_shrinker, &sc));
- return num_freed;
+ return 0;
}
+DEFINE_SHOW_ATTRIBUTE(ttm_pool_debugfs_shrink);
-/* Return the number of pages available or SHRINK_EMPTY if we have none */
-static unsigned long ttm_pool_shrinker_count(struct shrinker *shrink,
- struct shrink_control *sc)
-{
- unsigned long num_pages = atomic_long_read(&allocated_pages);
-
- return num_pages ? num_pages : SHRINK_EMPTY;
-}
+#endif
/**
* ttm_pool_mgr_init - Initialize globals
@@ -688,6 +700,8 @@ int ttm_pool_mgr_init(unsigned long num_pages)
#ifdef CONFIG_DEBUG_FS
debugfs_create_file("page_pool", 0444, ttm_debugfs_root, NULL,
&ttm_pool_debugfs_globals_fops);
+ debugfs_create_file("page_pool_shrink", 0400, ttm_debugfs_root, NULL,
+ &ttm_pool_debugfs_shrink_fops);
#endif
mm_shrinker.count_objects = ttm_pool_shrinker_count;
--
2.25.1
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