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diff --git a/src/ceph/src/osd/mClockOpClassQueue.cc b/src/ceph/src/osd/mClockOpClassQueue.cc
new file mode 100644
index 0000000..848d8d6
--- /dev/null
+++ b/src/ceph/src/osd/mClockOpClassQueue.cc
@@ -0,0 +1,123 @@
+// -*- 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) 2016 Red Hat Inc.
+ *
+ * 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 <memory>
+
+#include "osd/mClockOpClassQueue.h"
+#include "common/dout.h"
+
+
+namespace dmc = crimson::dmclock;
+
+
+#define dout_context cct
+#define dout_subsys ceph_subsys_osd
+#undef dout_prefix
+#define dout_prefix *_dout
+
+
+namespace ceph {
+
+  mClockOpClassQueue::mclock_op_tags_t::mclock_op_tags_t(CephContext *cct) :
+    client_op(cct->_conf->osd_op_queue_mclock_client_op_res,
+	      cct->_conf->osd_op_queue_mclock_client_op_wgt,
+	      cct->_conf->osd_op_queue_mclock_client_op_lim),
+    osd_subop(cct->_conf->osd_op_queue_mclock_osd_subop_res,
+	      cct->_conf->osd_op_queue_mclock_osd_subop_wgt,
+	      cct->_conf->osd_op_queue_mclock_osd_subop_lim),
+    snaptrim(cct->_conf->osd_op_queue_mclock_snap_res,
+	     cct->_conf->osd_op_queue_mclock_snap_wgt,
+	     cct->_conf->osd_op_queue_mclock_snap_lim),
+    recov(cct->_conf->osd_op_queue_mclock_recov_res,
+	  cct->_conf->osd_op_queue_mclock_recov_wgt,
+	  cct->_conf->osd_op_queue_mclock_recov_lim),
+    scrub(cct->_conf->osd_op_queue_mclock_scrub_res,
+	  cct->_conf->osd_op_queue_mclock_scrub_wgt,
+	  cct->_conf->osd_op_queue_mclock_scrub_lim)
+  {
+    dout(20) <<
+      "mClockOpClassQueue settings:: " <<
+      "client_op:" << client_op <<
+      "; osd_subop:" << osd_subop <<
+      "; snaptrim:" << snaptrim <<
+      "; recov:" << recov <<
+      "; scrub:" << scrub <<
+      dendl;
+  }
+
+
+  dmc::ClientInfo
+  mClockOpClassQueue::op_class_client_info_f(const osd_op_type_t& op_type) {
+    switch(op_type) {
+    case osd_op_type_t::client_op:
+      return mclock_op_tags->client_op;
+    case osd_op_type_t::osd_subop:
+      return mclock_op_tags->osd_subop;
+    case osd_op_type_t::bg_snaptrim:
+      return mclock_op_tags->snaptrim;
+    case osd_op_type_t::bg_recovery:
+      return mclock_op_tags->recov;
+    case osd_op_type_t::bg_scrub:
+      return mclock_op_tags->scrub;
+    default:
+      assert(0);
+      return dmc::ClientInfo(-1, -1, -1);
+    }
+  }
+
+  /*
+   * class mClockOpClassQueue
+   */
+
+  std::unique_ptr<mClockOpClassQueue::mclock_op_tags_t>
+  mClockOpClassQueue::mclock_op_tags(nullptr);
+
+  mClockOpClassQueue::pg_queueable_visitor_t
+  mClockOpClassQueue::pg_queueable_visitor;
+
+  mClockOpClassQueue::mClockOpClassQueue(CephContext *cct) :
+    queue(&mClockOpClassQueue::op_class_client_info_f)
+  {
+    // manage the singleton
+    if (!mclock_op_tags) {
+      mclock_op_tags.reset(new mclock_op_tags_t(cct));
+    }
+  }
+
+  mClockOpClassQueue::osd_op_type_t
+  mClockOpClassQueue::get_osd_op_type(const Request& request) {
+    osd_op_type_t type =
+      boost::apply_visitor(pg_queueable_visitor, request.second.get_variant());
+
+    // if we got client_op back then we need to distinguish between
+    // a client op and an osd subop.
+
+    if (osd_op_type_t::client_op != type) {
+      return type;
+    } else if (MSG_OSD_SUBOP ==
+	       boost::get<OpRequestRef>(
+		 request.second.get_variant())->get_req()->get_header().type) {
+      return osd_op_type_t::osd_subop;
+    } else {
+      return osd_op_type_t::client_op;
+    }
+  }
+
+  // Formatted output of the queue
+  void mClockOpClassQueue::dump(ceph::Formatter *f) const {
+    queue.dump(f);
+  }
+
+} // namespace ceph