1 /*
   2  * Copyright (c) 1997, 2020, Oracle and/or its affiliates. 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 #ifndef SHARE_GC_PARALLEL_PARALLEL_GLOBALS_HPP
  26 #define SHARE_GC_PARALLEL_PARALLEL_GLOBALS_HPP
  27 
  28 #include "utilities/macros.hpp"
  29 #if INCLUDE_PARALLELGC
  30 #include "runtime/flags/jvmFlag.hpp"
  31 PRODUCT_FLAG(uintx,    HeapMaximumCompactionInterval, 20, JVMFlag::RANGE,
  32                        "How often should we maximally compact the heap (not allowing "
  33                        "any dead space)");
  34    FLAG_RANGE(         HeapMaximumCompactionInterval, 0, max_uintx);
  35 
  36 PRODUCT_FLAG(uintx,    HeapFirstMaximumCompactionCount, 3, JVMFlag::RANGE,
  37                        "The collection count for the first maximum compaction");
  38    FLAG_RANGE(         HeapFirstMaximumCompactionCount, 0, max_uintx);
  39 
  40 PRODUCT_FLAG(bool,     UseMaximumCompactionOnSystemGC, true, JVMFlag::DEFAULT,
  41                        "Use maximum compaction in the Parallel Old garbage collector "
  42                        "for a system GC");
  43 
  44 PRODUCT_FLAG(size_t,   ParallelOldDeadWoodLimiterMean, 50, JVMFlag::RANGE,
  45                        "The mean used by the parallel compact dead wood "
  46                        "limiter (a number between 0-100)");
  47    FLAG_RANGE(         ParallelOldDeadWoodLimiterMean, 0, 100);
  48 
  49 PRODUCT_FLAG(size_t,   ParallelOldDeadWoodLimiterStdDev, 80, JVMFlag::RANGE,
  50                        "The standard deviation used by the parallel compact dead wood "
  51                        "limiter (a number between 0-100)");
  52    FLAG_RANGE(         ParallelOldDeadWoodLimiterStdDev, 0, 100);
  53 
  54 DEVELOP_FLAG(uintx,    GCWorkerDelayMillis, 0, JVMFlag::DEFAULT,
  55                        "Delay in scheduling GC workers (in milliseconds)");
  56 
  57 PRODUCT_FLAG(bool,     PSChunkLargeArrays, true, JVMFlag::DEFAULT,
  58                        "Process large arrays in chunks");
  59 #endif // INCLUDE_PARALLELGC
  60 
  61 #endif // SHARE_GC_PARALLEL_PARALLEL_GLOBALS_HPP