diff --git a/mm/cma.c b/mm/cma.c
index 7d745237fd01..6f81a895d44f 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -34,6 +34,7 @@
 #include <linux/io.h>
 #include <linux/kmemleak.h>
 #include <linux/delay.h>
+#include <linux/show_mem_notifier.h>
 #include <trace/events/cma.h>
 
 #include "cma.h"
@@ -96,6 +97,29 @@ static void cma_clear_bitmap(struct cma *cma, unsigned long pfn,
 	mutex_unlock(&cma->lock);
 }
 
+static int cma_showmem_notifier(struct notifier_block *nb,
+				   unsigned long action, void *data)
+{
+	int i;
+	unsigned long used;
+	struct cma *cma;
+
+	for (i = 0; i < cma_area_count; i++) {
+		cma = &cma_areas[i];
+		used = bitmap_weight(cma->bitmap,
+				     (int)cma_bitmap_maxno(cma));
+		used <<= cma->order_per_bit;
+		pr_info("cma-%d pages: => %lu used of %lu total pages\n",
+			i, used, cma->count);
+	}
+
+	return 0;
+}
+
+static struct notifier_block cma_nb = {
+	.notifier_call = cma_showmem_notifier,
+};
+
 static int __init cma_activate_area(struct cma *cma)
 {
 	int bitmap_size = BITS_TO_LONGS(cma_bitmap_maxno(cma)) * sizeof(long);
@@ -158,6 +182,8 @@ static int __init cma_init_reserved_areas(void)
 			return ret;
 	}
 
+	show_mem_notifier_register(&cma_nb);
+
 	return 0;
 }
 core_initcall(cma_init_reserved_areas);