src/hotspot/share/gc/parallel/parallelArguments.cpp

rev 57719 : imported patch 8235860-remove-serial-old-gc
rev 57720 : imported patch 8235860-kbarrett-review

*** 1,7 ****
  /*
!  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
--- 1,7 ----
  /*
!  * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
*** 42,57 ****
    return compute_heap_alignment();
  }
  
  void ParallelArguments::initialize() {
    GCArguments::initialize();
!   assert(UseParallelGC || UseParallelOldGC, "Error");
!   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
!   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
!     FLAG_SET_DEFAULT(UseParallelOldGC, true);
!   }
!   FLAG_SET_DEFAULT(UseParallelGC, true);
  
    // If no heap maximum was requested explicitly, use some reasonable fraction
    // of the physical memory, up to a maximum of 1GB.
    FLAG_SET_DEFAULT(ParallelGCThreads,
                     WorkerPolicy::parallel_worker_threads());
--- 42,52 ----
    return compute_heap_alignment();
  }
  
  void ParallelArguments::initialize() {
    GCArguments::initialize();
!   assert(UseParallelGC, "Error");
  
    // If no heap maximum was requested explicitly, use some reasonable fraction
    // of the physical memory, up to a maximum of 1GB.
    FLAG_SET_DEFAULT(ParallelGCThreads,
                     WorkerPolicy::parallel_worker_threads());
*** 83,100 ****
      if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
        FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
      }
    }
  
-   if (UseParallelOldGC) {
      // Par compact uses lower default values since they are treated as
      // minimums.  These are different defaults because of the different
      // interpretation and are not ergonomically set.
      if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
        FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
      }
-   }
  }
  
  // The alignment used for boundary between young gen and old gen
  static size_t default_gen_alignment() {
    return 64 * K * HeapWordSize;
--- 78,93 ----