282 lines
11 KiB
C++
282 lines
11 KiB
C++
/*
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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/adjoiningGenerations.hpp"
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#include "gc/parallel/adjoiningVirtualSpaces.hpp"
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#include "gc/parallel/generationSizer.hpp"
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#include "gc/parallel/parallelScavengeHeap.hpp"
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#include "logging/log.hpp"
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#include "logging/logStream.hpp"
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#include "memory/resourceArea.hpp"
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#include "utilities/align.hpp"
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#include "utilities/ostream.hpp"
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// If boundary moving is being used, create the young gen and old
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// gen with ASPSYoungGen and ASPSOldGen, respectively. Revert to
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// the old behavior otherwise (with PSYoungGen and PSOldGen).
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AdjoiningGenerations::AdjoiningGenerations(ReservedSpace old_young_rs,
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GenerationSizer* policy,
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size_t alignment) :
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_virtual_spaces(old_young_rs, policy->min_old_size(),
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policy->min_young_size(), alignment) {
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size_t init_low_byte_size = policy->initial_old_size();
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size_t min_low_byte_size = policy->min_old_size();
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size_t max_low_byte_size = policy->max_old_size();
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size_t init_high_byte_size = policy->initial_young_size();
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size_t min_high_byte_size = policy->min_young_size();
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size_t max_high_byte_size = policy->max_young_size();
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assert(min_low_byte_size <= init_low_byte_size &&
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init_low_byte_size <= max_low_byte_size, "Parameter check");
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assert(min_high_byte_size <= init_high_byte_size &&
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init_high_byte_size <= max_high_byte_size, "Parameter check");
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// Create the generations differently based on the option to
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// move the boundary.
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if (UseAdaptiveGCBoundary) {
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// Initialize the adjoining virtual spaces. Then pass the
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// a virtual to each generation for initialization of the
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// generation.
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// Does the actual creation of the virtual spaces
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_virtual_spaces.initialize(max_low_byte_size,
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init_low_byte_size,
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init_high_byte_size);
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// Place the young gen at the high end. Passes in the virtual space.
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_young_gen = new ASPSYoungGen(_virtual_spaces.high(),
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_virtual_spaces.high()->committed_size(),
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min_high_byte_size,
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_virtual_spaces.high_byte_size_limit());
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// Place the old gen at the low end. Passes in the virtual space.
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_old_gen = new ASPSOldGen(_virtual_spaces.low(),
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_virtual_spaces.low()->committed_size(),
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min_low_byte_size,
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_virtual_spaces.low_byte_size_limit(),
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"old", 1);
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young_gen()->initialize_work();
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assert(young_gen()->reserved().byte_size() <= young_gen()->gen_size_limit(),
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"Consistency check");
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assert(old_young_rs.size() >= young_gen()->gen_size_limit(),
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"Consistency check");
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old_gen()->initialize_work("old", 1);
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assert(old_gen()->reserved().byte_size() <= old_gen()->gen_size_limit(),
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"Consistency check");
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assert(old_young_rs.size() >= old_gen()->gen_size_limit(),
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"Consistency check");
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} else {
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// Layout the reserved space for the generations.
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ReservedSpace old_rs =
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virtual_spaces()->reserved_space().first_part(max_low_byte_size);
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ReservedSpace heap_rs =
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virtual_spaces()->reserved_space().last_part(max_low_byte_size);
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ReservedSpace young_rs = heap_rs.first_part(max_high_byte_size);
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assert(young_rs.size() == heap_rs.size(), "Didn't reserve all of the heap");
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// Create the generations. Virtual spaces are not passed in.
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_young_gen = new PSYoungGen(init_high_byte_size,
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min_high_byte_size,
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max_high_byte_size);
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_old_gen = new PSOldGen(init_low_byte_size,
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min_low_byte_size,
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max_low_byte_size,
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"old", 1);
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// The virtual spaces are created by the initialization of the gens.
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_young_gen->initialize(young_rs, alignment);
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assert(young_gen()->gen_size_limit() == young_rs.size(),
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"Consistency check");
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_old_gen->initialize(old_rs, alignment, "old", 1);
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assert(old_gen()->gen_size_limit() == old_rs.size(), "Consistency check");
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}
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}
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size_t AdjoiningGenerations::reserved_byte_size() {
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return virtual_spaces()->reserved_space().size();
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}
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void log_before_expansion(bool old, size_t expand_in_bytes, size_t change_in_bytes, size_t max_size) {
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Log(heap, ergo) log;
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if (!log.is_debug()) {
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return;
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}
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log.debug("Before expansion of %s gen with boundary move", old ? "old" : "young");
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log.debug(" Requested change: " SIZE_FORMAT_HEX " Attempted change: " SIZE_FORMAT_HEX,
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expand_in_bytes, change_in_bytes);
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ResourceMark rm;
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LogStream ls(log.debug());
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ParallelScavengeHeap::heap()->print_on(&ls);
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log.debug(" PS%sGen max size: " SIZE_FORMAT "K", old ? "Old" : "Young", max_size/K);
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}
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void log_after_expansion(bool old, size_t max_size) {
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Log(heap, ergo) log;
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if (!log.is_debug()) {
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return;
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}
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log.debug("After expansion of %s gen with boundary move", old ? "old" : "young");
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ResourceMark rm;
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LogStream ls(log.debug());
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ParallelScavengeHeap::heap()->print_on(&ls);
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log.debug(" PS%sGen max size: " SIZE_FORMAT "K", old ? "Old" : "Young", max_size/K);
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}
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// Make checks on the current sizes of the generations and
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// the constraints on the sizes of the generations. Push
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// up the boundary within the constraints. A partial
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// push can occur.
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void AdjoiningGenerations::request_old_gen_expansion(size_t expand_in_bytes) {
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assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
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assert_lock_strong(ExpandHeap_lock);
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assert_locked_or_safepoint(Heap_lock);
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// These sizes limit the amount the boundaries can move. Effectively,
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// the generation says how much it is willing to yield to the other
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// generation.
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const size_t young_gen_available = young_gen()->available_for_contraction();
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const size_t old_gen_available = old_gen()->available_for_expansion();
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const size_t alignment = virtual_spaces()->alignment();
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size_t change_in_bytes = MIN3(young_gen_available,
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old_gen_available,
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align_up(expand_in_bytes, alignment));
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if (change_in_bytes == 0) {
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return;
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}
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log_before_expansion(true, expand_in_bytes, change_in_bytes, old_gen()->max_gen_size());
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// Move the boundary between the generations up (smaller young gen).
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if (virtual_spaces()->adjust_boundary_up(change_in_bytes)) {
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young_gen()->reset_after_change();
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old_gen()->reset_after_change();
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}
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// The total reserved for the generations should match the sum
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// of the two even if the boundary is moving.
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assert(reserved_byte_size() ==
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old_gen()->max_gen_size() + young_gen()->max_size(),
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"Space is missing");
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young_gen()->space_invariants();
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old_gen()->space_invariants();
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log_after_expansion(true, old_gen()->max_gen_size());
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}
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// See comments on request_old_gen_expansion()
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bool AdjoiningGenerations::request_young_gen_expansion(size_t expand_in_bytes) {
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assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
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// If eden is not empty, the boundary can be moved but no advantage
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// can be made of the move since eden cannot be moved.
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if (!young_gen()->eden_space()->is_empty()) {
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return false;
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}
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bool result = false;
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const size_t young_gen_available = young_gen()->available_for_expansion();
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const size_t old_gen_available = old_gen()->available_for_contraction();
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const size_t alignment = virtual_spaces()->alignment();
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size_t change_in_bytes = MIN3(young_gen_available,
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old_gen_available,
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align_up(expand_in_bytes, alignment));
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if (change_in_bytes == 0) {
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return false;
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}
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log_before_expansion(false, expand_in_bytes, change_in_bytes, young_gen()->max_size());
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// Move the boundary between the generations down (smaller old gen).
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MutexLocker x(ExpandHeap_lock);
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if (virtual_spaces()->adjust_boundary_down(change_in_bytes)) {
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young_gen()->reset_after_change();
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old_gen()->reset_after_change();
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result = true;
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}
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// The total reserved for the generations should match the sum
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// of the two even if the boundary is moving.
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assert(reserved_byte_size() ==
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old_gen()->max_gen_size() + young_gen()->max_size(),
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"Space is missing");
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young_gen()->space_invariants();
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old_gen()->space_invariants();
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log_after_expansion(false, young_gen()->max_size());
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return result;
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}
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// Additional space is needed in the old generation. Try to move the boundary
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// up to meet the need. Moves boundary up only
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void AdjoiningGenerations::adjust_boundary_for_old_gen_needs(
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size_t desired_free_space) {
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assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
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// Stress testing.
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if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 1) {
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MutexLocker x(ExpandHeap_lock);
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request_old_gen_expansion(virtual_spaces()->alignment() * 3 / 2);
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}
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// Expand only if the entire generation is already committed.
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if (old_gen()->virtual_space()->uncommitted_size() == 0) {
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if (old_gen()->free_in_bytes() < desired_free_space) {
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MutexLocker x(ExpandHeap_lock);
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request_old_gen_expansion(desired_free_space);
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}
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}
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}
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// See comment on adjust_boundary_for_old_gen_needss().
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// Adjust boundary down only.
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void AdjoiningGenerations::adjust_boundary_for_young_gen_needs(size_t eden_size,
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size_t survivor_size) {
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assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
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// Stress testing.
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if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 0) {
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request_young_gen_expansion(virtual_spaces()->alignment() * 3 / 2);
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eden_size = young_gen()->eden_space()->capacity_in_bytes();
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}
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// Expand only if the entire generation is already committed.
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if (young_gen()->virtual_space()->uncommitted_size() == 0) {
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size_t desired_size = eden_size + 2 * survivor_size;
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const size_t committed = young_gen()->virtual_space()->committed_size();
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if (desired_size > committed) {
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request_young_gen_expansion(desired_size - committed);
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}
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}
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}
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