ceph/src/osd/TierAgentState.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 /*
   3  * Ceph - scalable distributed file system
   4  *
   5  * Copyright (C) 2013 Sage Weil <sage@inktank.com>
   6  *
   7  * This is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License version 2.1, as published by the Free Software
  10  * Foundation.  See file COPYING.
  11  *
  12  */
  13
  14 #ifndef CEPH_OSD_TIERAGENT_H
  15 #define CEPH_OSD_TIERAGENT_H
  16
  17 struct TierAgentState {
  18   /// current position iterating across pool
  19   hobject_t position;
  20   /// Count of agent_work since "start" position of object hash space
  21   int started;
  22   hobject_t start;
  23   bool delaying;
  24
  25   /// histogram of ages we've encountered
  26   pow2_hist_t temp_hist;
  27   int hist_age;
  28
  29   /// past HitSet(s) (not current)
  30   map<time_t,HitSetRef> hit_set_map;
  31
  32   /// a few recent things we've seen that are clean
  33   list<hobject_t> recent_clean;
  34
  35   enum flush_mode_t {
  36     FLUSH_MODE_IDLE,   // nothing to flush
  37     FLUSH_MODE_LOW, // flush dirty objects with a low speed
  38     FLUSH_MODE_HIGH, //flush dirty objects with a high speed
  39   } flush_mode;     ///< current flush behavior
  40   static const char *get_flush_mode_name(flush_mode_t m) {
  41     switch (m) {
  42     case FLUSH_MODE_IDLE: return "idle";
  43     case FLUSH_MODE_LOW: return "low";
  44     case FLUSH_MODE_HIGH: return "high";
  45     default: ceph_abort_msg("bad flush mode");
  46     }
  47   }
  48   const char *get_flush_mode_name() const {
  49     return get_flush_mode_name(flush_mode);
  50   }
  51
  52   enum evict_mode_t {
  53     EVICT_MODE_IDLE,      // no need to evict anything
  54     EVICT_MODE_SOME,      // evict some things as we are near the target
  55     EVICT_MODE_FULL,      // evict anything
  56   } evict_mode;     ///< current evict behavior
  57   static const char *get_evict_mode_name(evict_mode_t m) {
  58     switch (m) {
  59     case EVICT_MODE_IDLE: return "idle";
  60     case EVICT_MODE_SOME: return "some";
  61     case EVICT_MODE_FULL: return "full";
  62     default: ceph_abort_msg("bad evict mode");
  63     }
  64   }
  65   const char *get_evict_mode_name() const {
  66     return get_evict_mode_name(evict_mode);
  67   }
  68
  69   /// approximate ratio of objects (assuming they are uniformly
  70   /// distributed) that i should aim to evict.
  71   unsigned evict_effort;
  72
  73   TierAgentState()
  74     : started(0),
  75       delaying(false),
  76       hist_age(0),
  77       flush_mode(FLUSH_MODE_IDLE),
  78       evict_mode(EVICT_MODE_IDLE),
  79       evict_effort(0)
  80   {}
  81
  82   /// false if we have any work to do
  83   bool is_idle() const {
  84     return
  85       delaying ||
  86       (flush_mode == FLUSH_MODE_IDLE &&
  87       evict_mode == EVICT_MODE_IDLE);
  88   }
  89
  90   /// add archived HitSet
  91   void add_hit_set(time_t start, HitSetRef hs) {
  92     hit_set_map.insert(make_pair(start, hs));
  93   }
  94
  95   /// remove old/trimmed HitSet
  96   void remove_oldest_hit_set() {
  97     if (!hit_set_map.empty())
  98       hit_set_map.erase(hit_set_map.begin());
  99   }
 100
 101   /// discard all open hit sets
 102   void discard_hit_sets() {
 103     hit_set_map.clear();
 104   }
 105
 106   void dump(Formatter *f) const {
 107     f->dump_string("flush_mode", get_flush_mode_name());
 108     f->dump_string("evict_mode", get_evict_mode_name());
 109     f->dump_unsigned("evict_effort", evict_effort);
 110     f->dump_stream("position") << position;
 111     f->open_object_section("temp_hist");
 112     temp_hist.dump(f);
 113     f->close_section();
 114   }
 115 };
 116
 117 #endif