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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
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)
map<time_t,HitSetRef> hit_set_map;
/// a few recent things we've seen that are clean
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(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(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
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