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diff --git a/src/ceph/src/mgr/DaemonState.cc b/src/ceph/src/mgr/DaemonState.cc
new file mode 100644
index 0000000..a7b8f57
--- /dev/null
+++ b/src/ceph/src/mgr/DaemonState.cc
@@ -0,0 +1,173 @@
+// -*- 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 John Spray <john.spray@redhat.com>
+ *
+ * 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 "DaemonState.h"
+
+#include "MgrSession.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_mgr
+#undef dout_prefix
+#define dout_prefix *_dout << "mgr " << __func__ << " "
+
+void DaemonStateIndex::insert(DaemonStatePtr dm)
+{
+  RWLock::WLocker l(lock);
+
+  if (all.count(dm->key)) {
+    _erase(dm->key);
+  }
+
+  by_server[dm->hostname][dm->key] = dm;
+  all[dm->key] = dm;
+}
+
+void DaemonStateIndex::_erase(const DaemonKey& dmk)
+{
+  assert(lock.is_wlocked());
+
+  const auto to_erase = all.find(dmk);
+  assert(to_erase != all.end());
+  const auto dm = to_erase->second;
+  auto &server_collection = by_server[dm->hostname];
+  server_collection.erase(dm->key);
+  if (server_collection.empty()) {
+    by_server.erase(dm->hostname);
+  }
+
+  all.erase(to_erase);
+}
+
+DaemonStateCollection DaemonStateIndex::get_by_service(
+  const std::string& svc) const
+{
+  RWLock::RLocker l(lock);
+
+  DaemonStateCollection result;
+
+  for (const auto &i : all) {
+    if (i.first.first == svc) {
+      result[i.first] = i.second;
+    }
+  }
+
+  return result;
+}
+
+DaemonStateCollection DaemonStateIndex::get_by_server(
+  const std::string &hostname) const
+{
+  RWLock::RLocker l(lock);
+
+  if (by_server.count(hostname)) {
+    return by_server.at(hostname);
+  } else {
+    return {};
+  }
+}
+
+bool DaemonStateIndex::exists(const DaemonKey &key) const
+{
+  RWLock::RLocker l(lock);
+
+  return all.count(key) > 0;
+}
+
+DaemonStatePtr DaemonStateIndex::get(const DaemonKey &key)
+{
+  RWLock::RLocker l(lock);
+
+  auto iter = all.find(key);
+  if (iter != all.end()) {
+    return iter->second;
+  } else {
+    return nullptr;
+  }
+}
+
+void DaemonStateIndex::cull(const std::string& svc_name,
+			    const std::set<std::string>& names_exist)
+{
+  std::vector<string> victims;
+
+  RWLock::WLocker l(lock);
+  auto begin = all.lower_bound({svc_name, ""});
+  auto end = all.end();
+  for (auto &i = begin; i != end; ++i) {
+    const auto& daemon_key = i->first;
+    if (daemon_key.first != svc_name)
+      break;
+    if (names_exist.count(daemon_key.second) == 0) {
+      victims.push_back(daemon_key.second);
+    }
+  }
+
+  for (auto &i : victims) {
+    dout(4) << "Removing data for " << i << dendl;
+    _erase({svc_name, i});
+  }
+}
+
+void DaemonPerfCounters::update(MMgrReport *report)
+{
+  dout(20) << "loading " << report->declare_types.size() << " new types, "
+	   << report->undeclare_types.size() << " old types, had "
+	   << types.size() << " types, got "
+           << report->packed.length() << " bytes of data" << dendl;
+
+  // Retrieve session state
+  MgrSessionRef session(static_cast<MgrSession*>(
+        report->get_connection()->get_priv()));
+
+  // Load any newly declared types
+  for (const auto &t : report->declare_types) {
+    types.insert(std::make_pair(t.path, t));
+    session->declared_types.insert(t.path);
+  }
+  // Remove any old types
+  for (const auto &t : report->undeclare_types) {
+    session->declared_types.erase(t);
+  }
+
+  const auto now = ceph_clock_now();
+
+  // Parse packed data according to declared set of types
+  bufferlist::iterator p = report->packed.begin();
+  DECODE_START(1, p);
+  for (const auto &t_path : session->declared_types) {
+    const auto &t = types.at(t_path);
+    uint64_t val = 0;
+    uint64_t avgcount = 0;
+    uint64_t avgcount2 = 0;
+
+    ::decode(val, p);
+    if (t.type & PERFCOUNTER_LONGRUNAVG) {
+      ::decode(avgcount, p);
+      ::decode(avgcount2, p);
+    }
+    // TODO: interface for insertion of avgs
+    instances[t_path].push(now, val);
+  }
+  DECODE_FINISH(p);
+}
+
+uint64_t PerfCounterInstance::get_current() const
+{
+  return buffer.front().v;
+}
+
+void PerfCounterInstance::push(utime_t t, uint64_t const &v)
+{
+  buffer.push_back({t, v});
+}
+