rev 58558 : 8241605: Shenandoah: More aggressive reference discovery

   1 /*
   2  * Copyright (c) 2019, Red Hat, Inc. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc/shenandoah/shenandoahTraversalMode.hpp"
  27 #include "gc/shenandoah/heuristics/shenandoahTraversalAggressiveHeuristics.hpp"
  28 #include "gc/shenandoah/heuristics/shenandoahTraversalHeuristics.hpp"
  29 #include "logging/log.hpp"
  30 #include "logging/logTag.hpp"
  31 
  32 void ShenandoahTraversalMode::initialize_flags() const {
  33   FLAG_SET_DEFAULT(ShenandoahSATBBarrier,            false);
  34   FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, true);
  35   FLAG_SET_DEFAULT(ShenandoahKeepAliveBarrier,       false);
  36   FLAG_SET_DEFAULT(ShenandoahAllowMixedAllocs,       false);
  37 
  38   SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
  39   SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
  40 
  41   // Final configuration checks
  42   SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
  43   SHENANDOAH_CHECK_FLAG_SET(ShenandoahStoreValEnqueueBarrier);
  44   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
  45   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
  46 }
  47 
  48 ShenandoahHeuristics* ShenandoahTraversalMode::initialize_heuristics() const {
  49   if (ShenandoahGCHeuristics != NULL) {
  50     if (strcmp(ShenandoahGCHeuristics, "adaptive") == 0) {
  51       return new ShenandoahTraversalHeuristics();
  52     } else if (strcmp(ShenandoahGCHeuristics, "aggressive") == 0) {
  53       return new ShenandoahTraversalAggressiveHeuristics();
  54     } else {
  55       vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option");
  56     }
  57   }
  58   ShouldNotReachHere();
  59   return NULL;
  60 }
--- EOF ---