--- pmap.c
+++ pmap.c	2008-03-28 11:35:48.682190503 +0100
@@ -12,10 +12,13 @@
  */
 
 #include <stdio.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 #include <getopt.h>
+#include <sys/utsname.h>
+#include <unistd.h>
 
 #include "proc/readproc.h"
 #include "proc/version.h"
@@ -26,18 +29,26 @@
 struct smap {
 	unsigned long size;
 	unsigned long rss;
+	unsigned long pss;
 	unsigned long shared_clean;
 	unsigned long shared_dirty;
 	unsigned long private_clean;
 	unsigned long private_dirty;
+	unsigned long referenced;
 };
 
 static unsigned long mapped;
 static unsigned long shared;
 static unsigned long private;
 static unsigned long rss;
+static unsigned long pss;
 static unsigned long dirty;
+static unsigned long referenced;
 static FILE *smaps_fp;
+static int maj, min, patch, dopss, noref;
+static long lbits;
+#define BLK	((lbits==64)?"        ":"")
+#define WDT	((lbits==64)?16:8)
 
 static void usage(const char *cmd)
 {
@@ -85,6 +96,18 @@ static int get_smap_data(struct smap *sm
 	smap->rss = data;
 	rss += data;
 
+	if (dopss) {
+		/* get pss */
+		if (!fgets(buff, BUFFERSIZE, smaps_fp))
+			return 1;
+
+		assigned = sscanf(buff, "Pss: %lld", &data);
+		if (assigned != 1)
+			return 1;
+		smap->pss = data;
+		pss += data;
+	}
+
 	/* get shared clean */
 	if (!fgets(buff, BUFFERSIZE, smaps_fp))
 		return 1;
@@ -123,6 +146,19 @@ static int get_smap_data(struct smap *sm
 	smap->private_dirty = data;
 	dirty += data;
 
+	if (noref)
+		goto out;
+
+	/* 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;
+out:
 	return 0;
 }
 
@@ -130,7 +166,7 @@ static void parse_line(pid_t pid, const 
 {
 	unsigned long long low, high, size, offset;
 	unsigned long major, minor;
-	struct smap smap = { .rss = 0 };
+	struct smap smap = { .rss = 0, .pss = 0 };
 	int assigned;
 	char read_perm, write_perm, exec_perm, access_type;
 	char obj_buff[OBJECTSIZE] = "[anon]";
@@ -159,17 +195,19 @@ static void parse_line(pid_t pid, const 
 	else if (access_type == 'p' && write_perm == 'w')
 		private += size;
 
-	printf("%08llx %6lluK ", low, size);
+	printf("%0*llx %6lluK ", WDT, low, size);
 
 	if (smaps_fp) {
 		printf("%6luK ", smap.rss);
+		if (dopss)
+			printf("%6luK ", smap.pss);
 		printf("%6luK ", smap.private_dirty + smap.shared_dirty);
 	}
 
 	printf("%c%c%c%c ", read_perm, write_perm, exec_perm, access_type);
 
 	if (show_devices)
-		printf("%08llx %02lx:%02lx  ", offset, major, minor);
+		printf("%0*llx %02lx:%02lx  ", WDT, offset, major, minor);
 
 	printf("%s\n", obj_buff);
 }
@@ -181,8 +219,25 @@ 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) {
+		fprintf(stderr, "error getting information about current kernel: %m\n");
+		exit(EXIT_FAILURE);
+	}
+	sscanf(uts.release, "%d.%d.%d", &maj, &min, &patch);
+
+	if ((maj > 2) || ((maj == 2) && ((min > 6) || ((min == 6) && (patch >= 25)))))
+		dopss++;
+	if ((maj < 2) || ((maj == 2) && ((min < 6) || ((min == 6) && (patch < 22)))))
+		noref++;
+
+	if ((lbits = sysconf(_SC_LONG_BIT)) < 0) {
+		fprintf(stderr, "error getting information about current kernel: %m\n");
+		exit(EXIT_FAILURE);
+	}
+
 	struct option longopts[] = {
 		{ "help", 	0, NULL, 'h' },
 		{ "version", 	0, NULL, 'V' },
@@ -242,10 +297,12 @@ int main(int argc, char *argv[])
 	smaps_fp = fopen(path, "r");
 
 	if (!quiet) {
-		printf("START       SIZE ");
+		printf("START%s       SIZE ", BLK);
 
 		if (smaps_fp) {
 			printf("    RSS ");
+			if (dopss)
+				printf("    PSS ");
 			printf("  DIRTY ");
 		}
 
@@ -259,13 +316,20 @@ int main(int argc, char *argv[])
 		parse_line(pid, buff, show_devices);
 
 	if (!quiet) {
-		if (smaps_fp)
-			printf("Total:   %6luK %6luK %6luK\n\n", mapped, rss, dirty);
-		else 
+		if (smaps_fp) {
+			if (dopss)
+				printf("Total:%s   %6luK %6luK %6luK %6luK\n\n", BLK, mapped, rss, pss, dirty);
+			else
+				printf("Total:%s   %6luK %6luK %6luK\n\n", BLK, mapped, rss, dirty);
+		} else 
 			printf("mapped: %luK    ", mapped);
 
-		printf("%luK writable-private, %luK readonly-private, and %luK shared\n",
-		       private, mapped - private - shared, shared);
+		if (noref)
+			printf("%luK writable-private, %luK readonly-private, and %luK shared\n",
+				private, mapped - private - shared, shared);
+		else
+			printf("%luK writable-private, %luK readonly-private, %luK shared, and %luK referenced\n",
+				private, mapped - private - shared, shared, referenced);
 	}
 
 	return 0;