author | coleenp |
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/* |
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* Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_CMS_ALLOCATIONSTATS_HPP |
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#define SHARE_VM_GC_CMS_ALLOCATIONSTATS_HPP |
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#include "gc/shared/gcUtil.hpp" |
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#include "logging/log.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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#include "utilities/macros.hpp" |
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class AllocationStats { |
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// A duration threshold (in ms) used to filter |
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// possibly unreliable samples. |
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static float _threshold; |
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// We measure the demand between the end of the previous sweep and |
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// beginning of this sweep: |
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// Count(end_last_sweep) - Count(start_this_sweep) |
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// + split_births(between) - split_deaths(between) |
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// The above number divided by the time since the end of the |
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// previous sweep gives us a time rate of demand for blocks |
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// of this size. We compute a padded average of this rate as |
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// our current estimate for the time rate of demand for blocks |
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// of this size. Similarly, we keep a padded average for the time |
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// between sweeps. Our current estimate for demand for blocks of |
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// this size is then simply computed as the product of these two |
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// estimates. |
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AdaptivePaddedAverage _demand_rate_estimate; |
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ssize_t _desired; // Demand estimate computed as described above |
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ssize_t _coal_desired; // desired +/- small-percent for tuning coalescing |
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ssize_t _surplus; // count - (desired +/- small-percent), |
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// used to tune splitting in best fit |
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ssize_t _bfr_surp; // surplus at start of current sweep |
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ssize_t _prev_sweep; // count from end of previous sweep |
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ssize_t _before_sweep; // count from before current sweep |
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ssize_t _coal_births; // additional chunks from coalescing |
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ssize_t _coal_deaths; // loss from coalescing |
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ssize_t _split_births; // additional chunks from splitting |
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ssize_t _split_deaths; // loss from splitting |
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size_t _returned_bytes; // number of bytes returned to list. |
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public: |
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void initialize(bool split_birth = false); |
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AllocationStats() { |
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initialize(); |
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} |
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// The rate estimate is in blocks per second. |
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void compute_desired(size_t count, |
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float inter_sweep_current, |
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float inter_sweep_estimate, |
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float intra_sweep_estimate) { |
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// If the latest inter-sweep time is below our granularity |
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// of measurement, we may call in here with |
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// inter_sweep_current == 0. However, even for suitably small |
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// but non-zero inter-sweep durations, we may not trust the accuracy |
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// of accumulated data, since it has not been "integrated" |
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// (read "low-pass-filtered") long enough, and would be |
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// vulnerable to noisy glitches. In such cases, we |
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// ignore the current sample and use currently available |
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// historical estimates. |
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assert(prev_sweep() + split_births() + coal_births() // "Total Production Stock" |
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>= split_deaths() + coal_deaths() + (ssize_t)count, // "Current stock + depletion" |
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"Conservation Principle"); |
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if (inter_sweep_current > _threshold) { |
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ssize_t demand = prev_sweep() - (ssize_t)count + split_births() + coal_births() |
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- split_deaths() - coal_deaths(); |
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assert(demand >= 0, |
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"Demand (" SSIZE_FORMAT ") should be non-negative for " |
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PTR_FORMAT " (size=" SIZE_FORMAT ")", |
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demand, p2i(this), count); |
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// Defensive: adjust for imprecision in event counting |
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if (demand < 0) { |
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demand = 0; |
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} |
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float old_rate = _demand_rate_estimate.padded_average(); |
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float rate = ((float)demand)/inter_sweep_current; |
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_demand_rate_estimate.sample(rate); |
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float new_rate = _demand_rate_estimate.padded_average(); |
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ssize_t old_desired = _desired; |
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float delta_ise = (CMSExtrapolateSweep ? intra_sweep_estimate : 0.0); |
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_desired = (ssize_t)(new_rate * (inter_sweep_estimate + delta_ise)); |
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log_trace(gc, freelist)("demand: " SSIZE_FORMAT ", old_rate: %f, current_rate: %f, " |
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"new_rate: %f, old_desired: " SSIZE_FORMAT ", new_desired: " SSIZE_FORMAT, |
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demand, old_rate, rate, new_rate, old_desired, _desired); |
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} |
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} |
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ssize_t desired() const { return _desired; } |
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void set_desired(ssize_t v) { _desired = v; } |
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ssize_t coal_desired() const { return _coal_desired; } |
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void set_coal_desired(ssize_t v) { _coal_desired = v; } |
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ssize_t surplus() const { return _surplus; } |
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void set_surplus(ssize_t v) { _surplus = v; } |
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void increment_surplus() { _surplus++; } |
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void decrement_surplus() { _surplus--; } |
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ssize_t bfr_surp() const { return _bfr_surp; } |
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void set_bfr_surp(ssize_t v) { _bfr_surp = v; } |
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ssize_t prev_sweep() const { return _prev_sweep; } |
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void set_prev_sweep(ssize_t v) { _prev_sweep = v; } |
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ssize_t before_sweep() const { return _before_sweep; } |
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void set_before_sweep(ssize_t v) { _before_sweep = v; } |
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ssize_t coal_births() const { return _coal_births; } |
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void set_coal_births(ssize_t v) { _coal_births = v; } |
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void increment_coal_births() { _coal_births++; } |
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ssize_t coal_deaths() const { return _coal_deaths; } |
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void set_coal_deaths(ssize_t v) { _coal_deaths = v; } |
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void increment_coal_deaths() { _coal_deaths++; } |
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ssize_t split_births() const { return _split_births; } |
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void set_split_births(ssize_t v) { _split_births = v; } |
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void increment_split_births() { _split_births++; } |
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ssize_t split_deaths() const { return _split_deaths; } |
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void set_split_deaths(ssize_t v) { _split_deaths = v; } |
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void increment_split_deaths() { _split_deaths++; } |
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NOT_PRODUCT( |
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size_t returned_bytes() const { return _returned_bytes; } |
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void set_returned_bytes(size_t v) { _returned_bytes = v; } |
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) |
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}; |
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#endif // SHARE_VM_GC_CMS_ALLOCATIONSTATS_HPP |