| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc/g1/g1CollectedHeap.inline.hpp" |
| #include "gc/g1/g1IHOPControl.hpp" |
| #include "gc/g1/g1Predictions.hpp" |
| #include "gc/shared/gcTrace.hpp" |
| #include "logging/log.hpp" |
| |
| G1IHOPControl::G1IHOPControl(double initial_ihop_percent) : |
| _initial_ihop_percent(initial_ihop_percent), |
| _target_occupancy(0), |
| _last_allocated_bytes(0), |
| _last_allocation_time_s(0.0) |
| { |
| assert(_initial_ihop_percent >= 0.0 && _initial_ihop_percent <= 100.0, "Initial IHOP value must be between 0 and 100 but is %.3f", initial_ihop_percent); |
| } |
| |
| void G1IHOPControl::update_target_occupancy(size_t new_target_occupancy) { |
| log_debug(gc, ihop)("Target occupancy update: old: " SIZE_FORMAT "B, new: " SIZE_FORMAT "B", |
| _target_occupancy, new_target_occupancy); |
| _target_occupancy = new_target_occupancy; |
| } |
| |
| void G1IHOPControl::update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size) { |
| assert(allocation_time_s >= 0.0, "Allocation time must be positive but is %.3f", allocation_time_s); |
| |
| _last_allocation_time_s = allocation_time_s; |
| _last_allocated_bytes = allocated_bytes; |
| } |
| |
| void G1IHOPControl::print() { |
| assert(_target_occupancy > 0, "Target occupancy still not updated yet."); |
| size_t cur_conc_mark_start_threshold = get_conc_mark_start_threshold(); |
| log_debug(gc, ihop)("Basic information (value update), threshold: " SIZE_FORMAT "B (%1.2f), target occupancy: " SIZE_FORMAT "B, current occupancy: " SIZE_FORMAT "B, " |
| "recent allocation size: " SIZE_FORMAT "B, recent allocation duration: %1.2fms, recent old gen allocation rate: %1.2fB/s, recent marking phase length: %1.2fms", |
| cur_conc_mark_start_threshold, |
| cur_conc_mark_start_threshold * 100.0 / _target_occupancy, |
| _target_occupancy, |
| G1CollectedHeap::heap()->used(), |
| _last_allocated_bytes, |
| _last_allocation_time_s * 1000.0, |
| _last_allocation_time_s > 0.0 ? _last_allocated_bytes / _last_allocation_time_s : 0.0, |
| last_marking_length_s() * 1000.0); |
| } |
| |
| void G1IHOPControl::send_trace_event(G1NewTracer* tracer) { |
| assert(_target_occupancy > 0, "Target occupancy still not updated yet."); |
| tracer->report_basic_ihop_statistics(get_conc_mark_start_threshold(), |
| _target_occupancy, |
| G1CollectedHeap::heap()->used(), |
| _last_allocated_bytes, |
| _last_allocation_time_s, |
| last_marking_length_s()); |
| } |
| |
| G1StaticIHOPControl::G1StaticIHOPControl(double ihop_percent) : |
| G1IHOPControl(ihop_percent), |
| _last_marking_length_s(0.0) { |
| } |
| |
| G1AdaptiveIHOPControl::G1AdaptiveIHOPControl(double ihop_percent, |
| G1Predictions const* predictor, |
| size_t heap_reserve_percent, |
| size_t heap_waste_percent) : |
| G1IHOPControl(ihop_percent), |
| _predictor(predictor), |
| _marking_times_s(10, 0.95), |
| _allocation_rate_s(10, 0.95), |
| _last_unrestrained_young_size(0), |
| _heap_reserve_percent(heap_reserve_percent), |
| _heap_waste_percent(heap_waste_percent) |
| { |
| } |
| |
| size_t G1AdaptiveIHOPControl::actual_target_threshold() const { |
| guarantee(_target_occupancy > 0, "Target occupancy still not updated yet."); |
| // The actual target threshold takes the heap reserve and the expected waste in |
| // free space into account. |
| // _heap_reserve is that part of the total heap capacity that is reserved for |
| // eventual promotion failure. |
| // _heap_waste is the amount of space will never be reclaimed in any |
| // heap, so can not be used for allocation during marking and must always be |
| // considered. |
| |
| double safe_total_heap_percentage = MIN2((double)(_heap_reserve_percent + _heap_waste_percent), 100.0); |
| |
| return (size_t)MIN2( |
| G1CollectedHeap::heap()->max_capacity() * (100.0 - safe_total_heap_percentage) / 100.0, |
| _target_occupancy * (100.0 - _heap_waste_percent) / 100.0 |
| ); |
| } |
| |
| bool G1AdaptiveIHOPControl::have_enough_data_for_prediction() const { |
| return ((size_t)_marking_times_s.num() >= G1AdaptiveIHOPNumInitialSamples) && |
| ((size_t)_allocation_rate_s.num() >= G1AdaptiveIHOPNumInitialSamples); |
| } |
| |
| size_t G1AdaptiveIHOPControl::get_conc_mark_start_threshold() { |
| if (have_enough_data_for_prediction()) { |
| double pred_marking_time = _predictor->get_new_prediction(&_marking_times_s); |
| double pred_promotion_rate = _predictor->get_new_prediction(&_allocation_rate_s); |
| size_t pred_promotion_size = (size_t)(pred_marking_time * pred_promotion_rate); |
| |
| size_t predicted_needed_bytes_during_marking = |
| pred_promotion_size + |
| // In reality we would need the maximum size of the young gen during |
| // marking. This is a conservative estimate. |
| _last_unrestrained_young_size; |
| |
| size_t internal_threshold = actual_target_threshold(); |
| size_t predicted_initiating_threshold = predicted_needed_bytes_during_marking < internal_threshold ? |
| internal_threshold - predicted_needed_bytes_during_marking : |
| 0; |
| return predicted_initiating_threshold; |
| } else { |
| // Use the initial value. |
| return (size_t)(_initial_ihop_percent * _target_occupancy / 100.0); |
| } |
| } |
| |
| void G1AdaptiveIHOPControl::update_allocation_info(double allocation_time_s, |
| size_t allocated_bytes, |
| size_t additional_buffer_size) { |
| G1IHOPControl::update_allocation_info(allocation_time_s, allocated_bytes, additional_buffer_size); |
| |
| double allocation_rate = (double) allocated_bytes / allocation_time_s; |
| _allocation_rate_s.add(allocation_rate); |
| |
| _last_unrestrained_young_size = additional_buffer_size; |
| } |
| |
| void G1AdaptiveIHOPControl::update_marking_length(double marking_length_s) { |
| assert(marking_length_s >= 0.0, "Marking length must be larger than zero but is %.3f", marking_length_s); |
| _marking_times_s.add(marking_length_s); |
| } |
| |
| void G1AdaptiveIHOPControl::print() { |
| G1IHOPControl::print(); |
| size_t actual_target = actual_target_threshold(); |
| log_debug(gc, ihop)("Adaptive IHOP information (value update), threshold: " SIZE_FORMAT "B (%1.2f), internal target occupancy: " SIZE_FORMAT "B, " |
| "occupancy: " SIZE_FORMAT "B, additional buffer size: " SIZE_FORMAT "B, predicted old gen allocation rate: %1.2fB/s, " |
| "predicted marking phase length: %1.2fms, prediction active: %s", |
| get_conc_mark_start_threshold(), |
| percent_of(get_conc_mark_start_threshold(), actual_target), |
| actual_target, |
| G1CollectedHeap::heap()->used(), |
| _last_unrestrained_young_size, |
| _predictor->get_new_prediction(&_allocation_rate_s), |
| _predictor->get_new_prediction(&_marking_times_s) * 1000.0, |
| have_enough_data_for_prediction() ? "true" : "false"); |
| } |
| |
| void G1AdaptiveIHOPControl::send_trace_event(G1NewTracer* tracer) { |
| G1IHOPControl::send_trace_event(tracer); |
| tracer->report_adaptive_ihop_statistics(get_conc_mark_start_threshold(), |
| actual_target_threshold(), |
| G1CollectedHeap::heap()->used(), |
| _last_unrestrained_young_size, |
| _predictor->get_new_prediction(&_allocation_rate_s), |
| _predictor->get_new_prediction(&_marking_times_s), |
| have_enough_data_for_prediction()); |
| } |