--- pmap.c
+++ pmap.c	2007-06-11 17:22:37.794874038 +0200
@@ -16,6 +16,7 @@
 #include <string.h>
 #include <errno.h>
 #include <getopt.h>
+#include <sys/utsname.h>
 
 #include "proc/readproc.h"
 #include "proc/version.h"
@@ -30,6 +31,7 @@ struct smap {
 	unsigned long shared_dirty;
 	unsigned long private_clean;
 	unsigned long private_dirty;
+	unsigned long referenced;
 };
 
 static unsigned long mapped;
@@ -37,7 +39,9 @@ static unsigned long shared;
 static unsigned long private;
 static unsigned long rss;
 static unsigned long dirty;
+static unsigned long referenced;
 static FILE *smaps_fp;
+static int maj, min, patch;
 
 static void usage(const char *cmd)
 {
@@ -123,6 +127,19 @@ static int get_smap_data(struct smap *sm
 	smap->private_dirty = data;
 	dirty += data;
 
+	if ((maj < 2) || ((maj == 2) && ((min < 6) || ((min == 6) && (patch < 22)))))
+		return 0;
+
+	/* get referenced */
+	if (!fgets(buff, BUFFERSIZE, smaps_fp))
+		return 1;
+
+	assigned = sscanf(buff, "Referenced: %lld", &data);
+	if (assigned != 1)
+		return 1;
+	smap->referenced = data;
+	referenced += data;
+
 	return 0;
 }
 
@@ -181,8 +198,12 @@ int main(int argc, char *argv[])
 	char path[PATH_MAX];
 	char buff[BUFFERSIZE];
 	int o, show_devices = 0, quiet = 0;
+	struct utsname uts;
 	pid_t pid;
 
+	if (uname(&uts) == 0)
+		sscanf(uts.release, "%d.%d.%d", &maj, &min, &patch);
+
 	struct option longopts[] = {
 		{ "help", 	0, NULL, 'h' },
 		{ "version", 	0, NULL, 'V' },
@@ -264,8 +285,12 @@ int main(int argc, char *argv[])
 		else 
 			printf("mapped: %luK    ", mapped);
 
-		printf("%luK writable-private, %luK readonly-private, and %luK shared\n",
-		       private, mapped - private - shared, shared);
+		if ((maj < 2) || ((maj == 2) && ((min < 6) || ((min == 6) && (patch < 22)))))
+			printf("%luK writable-private, %luK readonly-private, and %luK shared\n",
+				private, mapped - private - shared, shared, referenced);
+		else
+			printf("%luK writable-private, %luK readonly-private, %luK shared, and %luK referenced\n",
+				private, mapped - private - shared, shared, referenced);
 	}
 
 	return 0;