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diff --git a/src/osd/TierAgentState.h b/src/osd/TierAgentState.h
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+++ b/src/osd/TierAgentState.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013 Sage Weil <sage@inktank.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.
+ *
+ */
+
+#ifndef CEPH_OSD_TIERAGENT_H
+#define CEPH_OSD_TIERAGENT_H
+
+#include <ctime>
+#include <list>
+#include <map>
+#include <utility>
+
+#include "common/Formatter.h"
+#include "common/histogram.h"
+#include "common/hobject.h"
+
+#include "osd/HitSet.h"
+
+struct TierAgentState {
+  /// current position iterating across pool
+  hobject_t position;
+  /// Count of agent_work since "start" position of object hash space
+  int started;
+  hobject_t start;
+  bool delaying;
+
+  /// histogram of ages we've encountered
+  pow2_hist_t temp_hist;
+  int hist_age;
+
+  /// past HitSet(s) (not current)
+  std::map<time_t,HitSetRef> hit_set_map;
+
+  /// a few recent things we've seen that are clean
+  std::list<hobject_t> recent_clean;
+
+  enum flush_mode_t {
+    FLUSH_MODE_IDLE,   // nothing to flush
+    FLUSH_MODE_LOW, // flush dirty objects with a low speed
+    FLUSH_MODE_HIGH, //flush dirty objects with a high speed
+  } flush_mode;     ///< current flush behavior
+  static const char *get_flush_mode_name(flush_mode_t m) {
+    switch (m) {
+    case FLUSH_MODE_IDLE: return "idle";
+    case FLUSH_MODE_LOW: return "low";
+    case FLUSH_MODE_HIGH: return "high";
+    default: ceph_abort_msg("bad flush mode");
+    }
+  }
+  const char *get_flush_mode_name() const {
+    return get_flush_mode_name(flush_mode);
+  }
+
+  enum evict_mode_t {
+    EVICT_MODE_IDLE,      // no need to evict anything
+    EVICT_MODE_SOME,      // evict some things as we are near the target
+    EVICT_MODE_FULL,      // evict anything
+  } evict_mode;     ///< current evict behavior
+  static const char *get_evict_mode_name(evict_mode_t m) {
+    switch (m) {
+    case EVICT_MODE_IDLE: return "idle";
+    case EVICT_MODE_SOME: return "some";
+    case EVICT_MODE_FULL: return "full";
+    default: ceph_abort_msg("bad evict mode");
+    }
+  }
+  const char *get_evict_mode_name() const {
+    return get_evict_mode_name(evict_mode);
+  }
+
+  /// approximate ratio of objects (assuming they are uniformly
+  /// distributed) that i should aim to evict.
+  unsigned evict_effort;
+
+  TierAgentState()
+    : started(0),
+      delaying(false),
+      hist_age(0),
+      flush_mode(FLUSH_MODE_IDLE),
+      evict_mode(EVICT_MODE_IDLE),
+      evict_effort(0)
+  {}
+
+  /// false if we have any work to do
+  bool is_idle() const {
+    return
+      delaying ||
+      (flush_mode == FLUSH_MODE_IDLE &&
+      evict_mode == EVICT_MODE_IDLE);
+  }
+
+  /// add archived HitSet
+  void add_hit_set(time_t start, HitSetRef hs) {
+    hit_set_map.insert(std::make_pair(start, hs));
+  }
+
+  /// remove old/trimmed HitSet
+  void remove_oldest_hit_set() {
+    if (!hit_set_map.empty())
+      hit_set_map.erase(hit_set_map.begin());
+  }
+
+  /// discard all open hit sets
+  void discard_hit_sets() {
+    hit_set_map.clear();
+  }
+
+  void dump(ceph::Formatter *f) const {
+    f->dump_string("flush_mode", get_flush_mode_name());
+    f->dump_string("evict_mode", get_evict_mode_name());
+    f->dump_unsigned("evict_effort", evict_effort);
+    f->dump_stream("position") << position;
+    f->open_object_section("temp_hist");
+    temp_hist.dump(f);
+    f->close_section();
+  }
+};
+
+#endif