2 files changed, 56 insertions, 1 deletions
diff --git a/mm/Makefile b/mm/Makefile
index 30e403700..ba25726ce 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -17,7 +17,8 @@ obj-y			:= filemap.o mempool.o oom_kill.o fadvise.o \
 			   util.o mmzone.o vmstat.o backing-dev.o \
 			   mm_init.o mmu_context.o percpu.o slab_common.o \
 			   compaction.o balloon_compaction.o \
-			   interval_tree.o $(mmu-y)
+			   interval_tree.o $(mmu-y) \
+			   showmem.o
 
 obj-y += init-mm.o
 
diff --git a/mm/showmem.c b/mm/showmem.c
new file mode 100644
index 000000000..ddad34ebb
--- /dev/null
+++ b/mm/showmem.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/notifier.h>
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+
+BLOCKING_NOTIFIER_HEAD(show_mem_notifier);
+
+int show_mem_notifier_register(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&show_mem_notifier, nb);
+}
+
+int show_mem_notifier_unregister(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&show_mem_notifier, nb);
+}
+
+void show_mem_call_notifiers(void)
+{
+	blocking_notifier_call_chain(&show_mem_notifier, 0, NULL);
+}
+
+static int show_mem_notifier_get(void *dat, u64 *val)
+{
+	show_mem_call_notifiers();
+	*val = 0;
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(show_mem_notifier_debug_ops, show_mem_notifier_get,
+				NULL, "%llu\n");
+
+int show_mem_notifier_debugfs_register(void)
+{
+	debugfs_create_file("show_mem_notifier", 0664, NULL, NULL,
+				&show_mem_notifier_debug_ops);
+
+	return 0;
+}
+late_initcall(show_mem_notifier_debugfs_register);