Only in xen-unstable/tools/python: build
diff -u -r xen-unstable-orig/tools/python/xen/xm/main.py xen-unstable/tools/python/xen/xm/main.py
--- xen-unstable-orig/tools/python/xen/xm/main.py	2005-05-16 13:54:30.000000000 -0400
+++ xen-unstable/tools/python/xen/xm/main.py	2005-05-16 17:43:43.000000000 -0400
@@ -15,6 +15,7 @@
 from xen.xend.XendClient import main as xend_client_main
 from xen.xm import create, destroy, migrate, shutdown, sysrq
 from xen.xm.opts import *
+from xen.sv.util import *
 
 def unit(c):
     if not c.isalpha():
@@ -383,6 +384,9 @@
             self.brief_list(doms)
 
     def brief_list(self, doms):
+        totalused = 0
+        totalmem = 0
+        totalfree = 0
         print 'Name              Id  Mem(MB)  CPU VCPU(s)  State  Time(s)  Console'
         for dom in doms:
             info = server.xend_domain(dom)
@@ -390,6 +394,7 @@
             d['dom'] = int(sxp.child_value(info, 'id', '-1'))
             d['name'] = sxp.child_value(info, 'name', '??')
             d['mem'] = int(sxp.child_value(info, 'memory', '0'))
+            totalused = totalused + int(sxp.child_value(info, 'memory', '0'))
             d['cpu'] = int(sxp.child_value(info, 'cpu', '0'))
             d['vcpus'] = int(sxp.child_value(info, 'vcpus', '0'))
             d['state'] = sxp.child_value(info, 'state', '??')
@@ -401,9 +406,17 @@
                 d['port'] = ''
             print ("%(name)-16s %(dom)3d  %(mem)7d  %(cpu)3d  %(vcpus)5d   %(state)5s  %(cpu_time)7.1f     %(port)4s"
                    % d)
+        try: 
+            nodeInfo = sxp2hash( server.xend_node() )
+        except:
+            nodeInfo[ 'system' ] = 'Error getting node info'
+        tmem = memoryFormatter(nodeInfo['memory'])
+        fmem = memoryFormatter(nodeInfo['free_memory'])
+        umem = memoryFormatter(totalused)
+        print "Mem Usage(MB)  total "+ tmem + " used: " + umem + " free: " + fmem