X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;ds=sidebyside;f=mm%2Fvmscan.c;h=0c56f6a812bcd9d375aa74cf4b59b7d2b6176e91;hb=c6b59a6e764bb1bfc9ea8a106c415df9984eb543;hp=2aec4241b42a9f0b02c8f4124698d6b595c96390;hpb=787b121db159641de9d0bfd11dc8c3f0ff8697d3;p=firefly-linux-kernel-4.4.55.git

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2aec4241b42a..0c56f6a812bc 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -46,6 +46,7 @@
 #include <linux/oom.h>
 #include <linux/prefetch.h>
 #include <linux/printk.h>
+#include <linux/debugfs.h>
 
 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -220,6 +221,39 @@ 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->count_objects(shrinker, &sc);
+		seq_printf(s, "%pf %d\n", shrinker->scan_objects, 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.
  */
@@ -249,6 +283,15 @@ int 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
  */