--- old/src/os/bsd/vm/os_bsd.cpp	Wed Oct  9 08:25:12 2013
+++ new/src/os/bsd/vm/os_bsd.cpp	Wed Oct  9 08:25:11 2013
@@ -157,9 +157,18 @@
   return Bsd::available_memory();
 }
 
+// available here means free
 julong os::Bsd::available_memory() {
-  // XXXBSD: this is just a stopgap implementation
-  return physical_memory() >> 2;
+  uint64_t available = physical_memory() >> 2;
+#ifdef __APPLE__
+  mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
+  vm_statistics64_data_t vmstat;
+  kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, (host_info64_t)&vmstat, &count);
+  if (kerr == KERN_SUCCESS) {
+    available = vmstat.free_count * os::vm_page_size();
+  }
+#endif
+  return available;
 }
 
 julong os::physical_memory() {