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diff --git a/src/ceph/src/common/MemoryModel.h b/src/ceph/src/common/MemoryModel.h
new file mode 100644
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--- /dev/null
+++ b/src/ceph/src/common/MemoryModel.h
@@ -0,0 +1,54 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+#ifndef CEPH_MEMORYMODEL_H
+#define CEPH_MEMORYMODEL_H
+
+class CephContext;
+
+class MemoryModel {
+public:
+  struct snap {
+    long peak;
+    long size;
+    long hwm;
+    long rss;
+    long data;
+    long lib;
+    
+    long heap;
+
+    snap() : peak(0), size(0), hwm(0), rss(0), data(0), lib(0),
+	     heap(0)
+    {}
+
+    long get_total() { return size; }
+    long get_rss() { return rss; }
+    long get_heap() { return heap; }
+  } last;
+
+private:
+  CephContext *cct;
+  void _sample(snap *p);
+
+public:
+  explicit MemoryModel(CephContext *cct);
+  void sample(snap *p = 0) {
+    _sample(&last);
+    if (p)
+      *p = last;
+  }
+};
+
+#endif