148 lines
6.0 KiB
C++
148 lines
6.0 KiB
C++
/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
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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/g1Arguments.hpp"
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#include "gc/g1/g1CollectedHeap.inline.hpp"
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#include "gc/g1/g1CollectorPolicy.hpp"
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#include "gc/g1/g1HeapVerifier.hpp"
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#include "gc/g1/heapRegion.hpp"
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#include "gc/shared/gcArguments.inline.hpp"
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#include "runtime/globals.hpp"
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#include "runtime/globals_extension.hpp"
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#include "runtime/vm_version.hpp"
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size_t G1Arguments::conservative_max_heap_alignment() {
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return HeapRegion::max_region_size();
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}
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void G1Arguments::initialize_verification_types() {
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if (strlen(VerifyGCType) > 0) {
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const char delimiter[] = " ,\n";
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size_t length = strlen(VerifyGCType);
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char* type_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
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strncpy(type_list, VerifyGCType, length + 1);
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char* token = strtok(type_list, delimiter);
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while (token != NULL) {
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parse_verification_type(token);
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token = strtok(NULL, delimiter);
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}
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FREE_C_HEAP_ARRAY(char, type_list);
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}
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}
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void G1Arguments::parse_verification_type(const char* type) {
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if (strcmp(type, "young-only") == 0) {
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G1HeapVerifier::enable_verification_type(G1HeapVerifier::G1VerifyYoungOnly);
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} else if (strcmp(type, "initial-mark") == 0) {
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G1HeapVerifier::enable_verification_type(G1HeapVerifier::G1VerifyInitialMark);
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} else if (strcmp(type, "mixed") == 0) {
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G1HeapVerifier::enable_verification_type(G1HeapVerifier::G1VerifyMixed);
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} else if (strcmp(type, "remark") == 0) {
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G1HeapVerifier::enable_verification_type(G1HeapVerifier::G1VerifyRemark);
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} else if (strcmp(type, "cleanup") == 0) {
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G1HeapVerifier::enable_verification_type(G1HeapVerifier::G1VerifyCleanup);
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} else if (strcmp(type, "full") == 0) {
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G1HeapVerifier::enable_verification_type(G1HeapVerifier::G1VerifyFull);
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} else {
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log_warning(gc, verify)("VerifyGCType: '%s' is unknown. Available types are: "
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"young-only, initial-mark, mixed, remark, cleanup and full", type);
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}
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}
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void G1Arguments::initialize() {
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GCArguments::initialize();
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assert(UseG1GC, "Error");
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FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
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if (ParallelGCThreads == 0) {
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assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
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vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
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}
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if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
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FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
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}
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// MarkStackSize will be set (if it hasn't been set by the user)
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// when concurrent marking is initialized.
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// Its value will be based upon the number of parallel marking threads.
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// But we do set the maximum mark stack size here.
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if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
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FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
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}
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if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
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// In G1, we want the default GC overhead goal to be higher than
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// it is for PS, or the heap might be expanded too aggressively.
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// We set it here to ~8%.
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FLAG_SET_DEFAULT(GCTimeRatio, 12);
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}
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// Below, we might need to calculate the pause time interval based on
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// the pause target. When we do so we are going to give G1 maximum
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// flexibility and allow it to do pauses when it needs to. So, we'll
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// arrange that the pause interval to be pause time target + 1 to
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// ensure that a) the pause time target is maximized with respect to
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// the pause interval and b) we maintain the invariant that pause
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// time target < pause interval. If the user does not want this
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// maximum flexibility, they will have to set the pause interval
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// explicitly.
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if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
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// The default pause time target in G1 is 200ms
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FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
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}
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// Then, if the interval parameter was not set, set it according to
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// the pause time target (this will also deal with the case when the
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// pause time target is the default value).
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if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
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FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
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}
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log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
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// By default do not let the target stack size to be more than 1/4 of the entries
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if (FLAG_IS_DEFAULT(GCDrainStackTargetSize)) {
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FLAG_SET_ERGO(uintx, GCDrainStackTargetSize, MIN2(GCDrainStackTargetSize, (uintx)TASKQUEUE_SIZE / 4));
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}
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#ifdef COMPILER2
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// Enable loop strip mining to offer better pause time guarantees
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if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) {
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FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true);
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if (FLAG_IS_DEFAULT(LoopStripMiningIter)) {
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FLAG_SET_DEFAULT(LoopStripMiningIter, 1000);
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}
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}
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#endif
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initialize_verification_types();
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}
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CollectedHeap* G1Arguments::create_heap() {
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return create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>();
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}
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