author | phh |
Sat, 30 Nov 2019 14:33:05 -0800 | |
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/* |
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* Copyright (c) 2003, 2015, 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/parallel/asPSOldGen.hpp" |
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#include "gc/parallel/parallelScavengeHeap.hpp" |
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#include "gc/parallel/psAdaptiveSizePolicy.hpp" |
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#include "gc/parallel/psMarkSweepDecorator.hpp" |
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#include "gc/shared/cardTableBarrierSet.hpp" |
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#include "gc/shared/genArguments.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/java.hpp" |
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#include "utilities/align.hpp" |
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// Whereas PSOldGen takes the maximum size of the generation |
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// (which doesn't change in the case of PSOldGen) as a parameter, |
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// ASPSOldGen takes the upper limit on the size of |
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// the generation as a parameter. In ASPSOldGen the |
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// maximum size of the generation can change as the boundary |
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// moves. The "maximum size of the generation" is still a valid |
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// concept since the generation can grow and shrink within that |
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// maximum. There are lots of useful checks that use that |
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// maximum. In PSOldGen the method max_gen_size() returns |
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// _max_gen_size (as set by the PSOldGen constructor). This |
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// is how it always worked. In ASPSOldGen max_gen_size() |
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// returned the size of the reserved space for the generation. |
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// That can change as the boundary moves. Below the limit of |
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// the size of the generation is passed to the PSOldGen constructor |
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// for "_max_gen_size" (have to pass something) but it is not used later. |
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// |
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ASPSOldGen::ASPSOldGen(size_t initial_size, |
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size_t min_size, |
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size_t size_limit, |
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const char* gen_name, |
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int level) : |
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PSOldGen(initial_size, min_size, size_limit, gen_name, level), |
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_gen_size_limit(size_limit) |
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{} |
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ASPSOldGen::ASPSOldGen(PSVirtualSpace* vs, |
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size_t initial_size, |
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size_t min_size, |
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size_t size_limit, |
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const char* gen_name, |
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int level) : |
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PSOldGen(initial_size, min_size, size_limit, gen_name, level), |
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_gen_size_limit(size_limit) |
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{ |
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_virtual_space = vs; |
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} |
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void ASPSOldGen::initialize_work(const char* perf_data_name, int level) { |
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PSOldGen::initialize_work(perf_data_name, level); |
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// The old gen can grow to gen_size_limit(). _reserve reflects only |
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// the current maximum that can be committed. |
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assert(_reserved.byte_size() <= gen_size_limit(), "Consistency check"); |
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initialize_performance_counters(perf_data_name, level); |
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} |
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void ASPSOldGen::reset_after_change() { |
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_reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), |
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(HeapWord*)virtual_space()->high_boundary()); |
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post_resize(); |
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} |
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size_t ASPSOldGen::available_for_expansion() { |
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assert(virtual_space()->is_aligned(gen_size_limit()), "not aligned"); |
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assert(gen_size_limit() >= virtual_space()->committed_size(), "bad gen size"); |
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size_t result = gen_size_limit() - virtual_space()->committed_size(); |
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size_t result_aligned = align_down(result, GenAlignment); |
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return result_aligned; |
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} |
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size_t ASPSOldGen::available_for_contraction() { |
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size_t uncommitted_bytes = virtual_space()->uncommitted_size(); |
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if (uncommitted_bytes != 0) { |
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return uncommitted_bytes; |
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} |
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ParallelScavengeHeap* heap = ParallelScavengeHeap::heap(); |
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PSAdaptiveSizePolicy* policy = heap->size_policy(); |
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const size_t working_size = |
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used_in_bytes() + (size_t) policy->avg_promoted()->padded_average(); |
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const size_t working_aligned = align_up(working_size, GenAlignment); |
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const size_t working_or_min = MAX2(working_aligned, min_gen_size()); |
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if (working_or_min > reserved().byte_size()) { |
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// If the used or minimum gen size (aligned up) is greater |
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// than the total reserved size, then the space available |
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// for contraction should (after proper alignment) be 0 |
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return 0; |
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} |
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const size_t max_contraction = |
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reserved().byte_size() - working_or_min; |
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// Use the "increment" fraction instead of the "decrement" fraction |
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// to allow the other gen to expand more aggressively. The |
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// "decrement" fraction is conservative because its intent is to |
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// only reduce the footprint. |
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size_t result = policy->promo_increment_aligned_down(max_contraction); |
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// Also adjust for inter-generational alignment |
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size_t result_aligned = align_down(result, GenAlignment); |
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Log(gc, ergo) log; |
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if (log.is_trace()) { |
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size_t working_promoted = (size_t) policy->avg_promoted()->padded_average(); |
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size_t promo_increment = policy->promo_increment(max_contraction); |
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log.trace("ASPSOldGen::available_for_contraction: " SIZE_FORMAT " K / " SIZE_FORMAT_HEX, result_aligned/K, result_aligned); |
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log.trace(" reserved().byte_size() " SIZE_FORMAT " K / " SIZE_FORMAT_HEX, reserved().byte_size()/K, reserved().byte_size()); |
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log.trace(" padded promoted " SIZE_FORMAT " K / " SIZE_FORMAT_HEX, working_promoted/K, working_promoted); |
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log.trace(" used " SIZE_FORMAT " K / " SIZE_FORMAT_HEX, used_in_bytes()/K, used_in_bytes()); |
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log.trace(" min_gen_size() " SIZE_FORMAT " K / " SIZE_FORMAT_HEX, min_gen_size()/K, min_gen_size()); |
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log.trace(" max_contraction " SIZE_FORMAT " K / " SIZE_FORMAT_HEX, max_contraction/K, max_contraction); |
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log.trace(" without alignment " SIZE_FORMAT " K / " SIZE_FORMAT_HEX, promo_increment/K, promo_increment); |
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log.trace(" alignment " SIZE_FORMAT_HEX, GenAlignment); |
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} |
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assert(result_aligned <= max_contraction, "arithmetic is wrong"); |
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return result_aligned; |
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} |