mirror of
https://github.com/ceph/ceph
synced 2025-01-17 00:12:31 +00:00
d5a6a251ae
Signed-off-by: Sage Weil <sage@inktank.com> Signed-off-by: Greg Farnum <greg@inktank.com>
83 lines
1.8 KiB
C++
83 lines
1.8 KiB
C++
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
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// vim: ts=8 sw=2 smarttab
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/*
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* Ceph - scalable distributed file system
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*
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* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
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*
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* This is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software
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* Foundation. See file COPYING.
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*
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*/
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#include "DecayCounter.h"
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#include "Formatter.h"
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void DecayCounter::encode(bufferlist& bl) const
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{
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ENCODE_START(4, 4, bl);
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::encode(val, bl);
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::encode(delta, bl);
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::encode(vel, bl);
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ENCODE_FINISH(bl);
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}
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void DecayCounter::decode(const utime_t &t, bufferlist::iterator &p)
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{
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DECODE_START_LEGACY_COMPAT_LEN(4, 4, 4, p);
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if (struct_v < 2) {
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double half_life;
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::decode(half_life, p);
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}
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if (struct_v < 3) {
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double k;
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::decode(k, p);
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}
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::decode(val, p);
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::decode(delta, p);
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::decode(vel, p);
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DECODE_FINISH(p);
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}
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void DecayCounter::dump(Formatter *f) const
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{
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f->dump_float("value", val);
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f->dump_float("delta", delta);
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f->dump_float("velocity", vel);
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}
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void DecayCounter::generate_test_instances(list<DecayCounter*>& ls)
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{
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utime_t fake_time;
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DecayCounter *counter = new DecayCounter(fake_time);
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counter->val = 3.0;
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counter->delta = 2.0;
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counter->vel = 1.0;
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ls.push_back(counter);
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counter = new DecayCounter(fake_time);
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ls.push_back(counter);
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}
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void DecayCounter::decay(utime_t now, const DecayRate &rate)
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{
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utime_t el = now;
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el -= last_decay;
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if (el.sec() >= 1) {
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// calculate new value
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double newval = (val+delta) * exp((double)el * rate.k);
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if (newval < .01)
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newval = 0.0;
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// calculate velocity approx
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vel += (newval - val) * (double)el;
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vel *= exp((double)el * rate.k);
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val = newval;
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delta = 0;
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last_decay = now;
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}
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}
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