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diff --git a/src/ceph/src/dmclock/src/dmclock_util.h b/src/ceph/src/dmclock/src/dmclock_util.h
new file mode 100644
index 0000000..c46d09f
--- /dev/null
+++ b/src/ceph/src/dmclock/src/dmclock_util.h
@@ -0,0 +1,53 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+/*
+ * Copyright (C) 2017 Red Hat Inc.
+ */
+
+
+#pragma once
+
+
+#include <unistd.h>
+#include <assert.h>
+#include <sys/time.h>
+
+#include <limits>
+#include <cmath>
+#include <chrono>
+
+
+namespace crimson {
+  namespace dmclock {
+    // we're using double to represent time, but we could change it by
+    // changing the following declarations (and by making sure a min
+    // function existed)
+    using Time = double;
+    static const Time TimeZero = 0.0;
+    static const Time TimeMax = std::numeric_limits<Time>::max();
+    static const double NaN = nan("");
+
+
+    inline Time get_time() {
+#if defined(__linux__)
+      struct timespec now;
+      auto result = clock_gettime(CLOCK_REALTIME, &now);
+      (void) result; // reference result in case assert is compiled out
+      assert(0 == result);
+      return now.tv_sec + (now.tv_nsec / 1.0e9);
+#else
+      struct timeval now;
+      auto result = gettimeofday(&now, NULL);
+      (void) result; // reference result in case assert is compiled out
+      assert(0 == result);
+      return now.tv_sec + (now.tv_usec / 1.0e6);
+#endif
+    }
+
+    std::string format_time(const Time& time, uint modulo = 1000);
+
+    void debugger();
+
+  } // namespace dmclock
+} // namespace crimson