src/hotspot/share/gc/shenandoah/shenandoahTraversalMode.cpp
author rkennke
Fri, 05 Jul 2019 11:07:09 +0200
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child 58679 9c3209ff7550
permissions -rw-r--r--
8227039: Shenandoah: Aggressive heuristics for Traversal mode Reviewed-by: shade
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/*
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 * Copyright (c) 2019, Red Hat, Inc. All rights reserved.
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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/shenandoah/shenandoahTraversalMode.hpp"
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#include "gc/shenandoah/heuristics/shenandoahTraversalAggressiveHeuristics.hpp"
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#include "gc/shenandoah/heuristics/shenandoahTraversalHeuristics.hpp"
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#include "logging/log.hpp"
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#include "logging/logTag.hpp"
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void ShenandoahTraversalMode::initialize_flags() const {
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  FLAG_SET_DEFAULT(ShenandoahSATBBarrier,            false);
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  FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, true);
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  FLAG_SET_DEFAULT(ShenandoahKeepAliveBarrier,       false);
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  FLAG_SET_DEFAULT(ShenandoahAllowMixedAllocs,       false);
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  SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
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  SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
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  // Final configuration checks
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  SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
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  SHENANDOAH_CHECK_FLAG_SET(ShenandoahStoreValEnqueueBarrier);
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  SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
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  SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
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}
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ShenandoahHeuristics* ShenandoahTraversalMode::initialize_heuristics() const {
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  if (ShenandoahGCHeuristics != NULL) {
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    if (strcmp(ShenandoahGCHeuristics, "adaptive") == 0) {
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      return new ShenandoahTraversalHeuristics();
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    } else if (strcmp(ShenandoahGCHeuristics, "aggressive") == 0) {
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      return new ShenandoahTraversalAggressiveHeuristics();
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    } else {
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      vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option");
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    }
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  }
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  ShouldNotReachHere();
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  return NULL;
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}