129 lines
5.0 KiB
C++
129 lines
5.0 KiB
C++
/*
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* Copyright (c) 2016, 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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#include "precompiled.hpp"
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#include "gc/g1/g1YoungGenSizer.hpp"
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#include "gc/g1/heapRegion.hpp"
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#include "logging/log.hpp"
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G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true),
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_min_desired_young_length(0), _max_desired_young_length(0) {
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if (FLAG_IS_CMDLINE(NewRatio)) {
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if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) {
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log_warning(gc, ergo)("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio");
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} else {
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_sizer_kind = SizerNewRatio;
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_adaptive_size = false;
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return;
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}
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}
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if (NewSize > MaxNewSize) {
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if (FLAG_IS_CMDLINE(MaxNewSize)) {
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log_warning(gc, ergo)("NewSize (" SIZE_FORMAT "k) is greater than the MaxNewSize (" SIZE_FORMAT "k). "
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"A new max generation size of " SIZE_FORMAT "k will be used.",
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NewSize/K, MaxNewSize/K, NewSize/K);
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}
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FLAG_SET_ERGO(size_t, MaxNewSize, NewSize);
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}
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if (FLAG_IS_CMDLINE(NewSize)) {
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_min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes),
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1U);
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if (FLAG_IS_CMDLINE(MaxNewSize)) {
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_max_desired_young_length =
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MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes),
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1U);
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_sizer_kind = SizerMaxAndNewSize;
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_adaptive_size = _min_desired_young_length != _max_desired_young_length;
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} else {
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_sizer_kind = SizerNewSizeOnly;
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}
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} else if (FLAG_IS_CMDLINE(MaxNewSize)) {
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_max_desired_young_length =
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MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes),
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1U);
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_sizer_kind = SizerMaxNewSizeOnly;
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}
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}
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uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) {
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uint default_value = (new_number_of_heap_regions * G1NewSizePercent) / 100;
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return MAX2(1U, default_value);
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}
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uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) {
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uint default_value = (new_number_of_heap_regions * G1MaxNewSizePercent) / 100;
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return MAX2(1U, default_value);
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}
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void G1YoungGenSizer::recalculate_min_max_young_length(uint number_of_heap_regions, uint* min_young_length, uint* max_young_length) {
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assert(number_of_heap_regions > 0, "Heap must be initialized");
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switch (_sizer_kind) {
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case SizerDefaults:
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*min_young_length = calculate_default_min_length(number_of_heap_regions);
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*max_young_length = calculate_default_max_length(number_of_heap_regions);
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break;
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case SizerNewSizeOnly:
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*max_young_length = calculate_default_max_length(number_of_heap_regions);
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*max_young_length = MAX2(*min_young_length, *max_young_length);
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break;
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case SizerMaxNewSizeOnly:
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*min_young_length = calculate_default_min_length(number_of_heap_regions);
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*min_young_length = MIN2(*min_young_length, *max_young_length);
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break;
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case SizerMaxAndNewSize:
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// Do nothing. Values set on the command line, don't update them at runtime.
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break;
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case SizerNewRatio:
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*min_young_length = number_of_heap_regions / (NewRatio + 1);
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*max_young_length = *min_young_length;
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break;
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default:
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ShouldNotReachHere();
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}
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assert(*min_young_length <= *max_young_length, "Invalid min/max young gen size values");
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}
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void G1YoungGenSizer::adjust_max_new_size(uint number_of_heap_regions) {
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// We need to pass the desired values because recalculation may not update these
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// values in some cases.
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uint temp = _min_desired_young_length;
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uint result = _max_desired_young_length;
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recalculate_min_max_young_length(number_of_heap_regions, &temp, &result);
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size_t max_young_size = result * HeapRegion::GrainBytes;
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if (max_young_size != MaxNewSize) {
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FLAG_SET_ERGO(size_t, MaxNewSize, max_young_size);
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}
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}
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void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) {
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recalculate_min_max_young_length(new_number_of_heap_regions, &_min_desired_young_length,
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&_max_desired_young_length);
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}
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