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diff --git a/src/ceph/src/common/mutex_debug.cc b/src/ceph/src/common/mutex_debug.cc
new file mode 100644
index 0000000..49cc82b
--- /dev/null
+++ b/src/ceph/src/common/mutex_debug.cc
@@ -0,0 +1,91 @@
+// -*- 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.
+ *
+ */
+
+#include "common/mutex_debug.h"
+#include "common/perf_counters.h"
+#include "common/ceph_context.h"
+#include "common/config.h"
+
+namespace ceph {
+namespace mutex_debug_detail {
+enum {
+  l_mutex_first = 999082,
+  l_mutex_wait,
+  l_mutex_last
+};
+
+mutex_debugging_base::mutex_debugging_base(const std::string &n, bool bt,
+					   CephContext *cct) :
+  id(-1), backtrace(bt), nlock(0), locked_by(thread::id()),
+  cct(cct), logger(0) {
+  if (n.empty()) {
+    uuid_d uu;
+    uu.generate_random();
+    name = string("Unnamed-Mutex-") + uu.to_string();
+  } else {
+    name = n;
+  }
+  if (cct) {
+    PerfCountersBuilder b(cct, string("mutex-") + name,
+			  l_mutex_first, l_mutex_last);
+    b.add_time_avg(l_mutex_wait, "wait",
+		   "Average time of mutex in locked state");
+    logger = b.create_perf_counters();
+    cct->get_perfcounters_collection()->add(logger);
+    logger->set(l_mutex_wait, 0);
+  }
+  if (g_lockdep)
+    _register();
+}
+
+mutex_debugging_base::~mutex_debugging_base() {
+  assert(nlock == 0);
+  if (cct && logger) {
+    cct->get_perfcounters_collection()->remove(logger);
+    delete logger;
+  }
+  if (g_lockdep) {
+    lockdep_unregister(id);
+  }
+}
+
+void mutex_debugging_base::_register() {
+  id = lockdep_register(name.c_str());
+}
+void mutex_debugging_base::_will_lock() { // about to lock
+  id = lockdep_will_lock(name.c_str(), id, backtrace);
+}
+void mutex_debugging_base::_locked() {    // just locked
+  id = lockdep_locked(name.c_str(), id, backtrace);
+}
+void mutex_debugging_base::_will_unlock() {  // about to unlock
+  id = lockdep_will_unlock(name.c_str(), id);
+}
+
+ceph::mono_time mutex_debugging_base::before_lock_blocks() {
+  if (logger && cct && cct->_conf->mutex_perf_counter)
+    return ceph::mono_clock::now();
+  return ceph::mono_time::min();
+}
+
+void mutex_debugging_base::after_lock_blocks(ceph::mono_time start,
+					     bool no_lockdep) {
+  if (logger && cct && cct->_conf->mutex_perf_counter)
+    logger->tinc(l_mutex_wait,
+		 ceph::mono_clock::now() - start);
+  if (!no_lockdep && g_lockdep)
+    _locked();
+}
+} // namespace mutex_debug_detail
+} // namespace ceph