Merge branch 'linux-linaro-lsk' into linux-linaro-lsk-android

[firefly-linux-kernel-4.4.55.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index fa6a85378ee41400985aca748cd76b59c0f87594..5d41059e1e924b4bcb31c73083c59d0a114e09b0 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -43,6 +43,7 @@
 #include <linux/sysctl.h>
 #include <linux/oom.h>
 #include <linux/prefetch.h>
+#include <linux/debugfs.h>
 
 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -154,6 +155,39 @@ static unsigned long get_lru_size(struct lruvec *lruvec, enum lru_list lru)
        return zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru);
 }
 
+struct dentry *debug_file;
+
+static int debug_shrinker_show(struct seq_file *s, void *unused)
+{
+       struct shrinker *shrinker;
+       struct shrink_control sc;
+
+       sc.gfp_mask = -1;
+       sc.nr_to_scan = 0;
+
+       down_read(&shrinker_rwsem);
+       list_for_each_entry(shrinker, &shrinker_list, list) {
+               int num_objs;
+
+               num_objs = shrinker->shrink(shrinker, &sc);
+               seq_printf(s, "%pf %d\n", shrinker->shrink, num_objs);
+       }
+       up_read(&shrinker_rwsem);
+       return 0;
+}
+
+static int debug_shrinker_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, debug_shrinker_show, inode->i_private);
+}
+
+static const struct file_operations debug_shrinker_fops = {
+        .open = debug_shrinker_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
 /*
  * Add a shrinker callback to be called from the vm
  */
@@ -166,6 +200,15 @@ void register_shrinker(struct shrinker *shrinker)
 }
 EXPORT_SYMBOL(register_shrinker);
 
+static int __init add_shrinker_debug(void)
+{
+       debugfs_create_file("shrinker", 0644, NULL, NULL,
+                           &debug_shrinker_fops);
+       return 0;
+}
+
+late_initcall(add_shrinker_debug);
+
 /*
  * Remove one
  */