1 /*
   2  * Copyright (c) 2012, 2018, 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_VM_GC_SHARED_GCCONFIGURATION_HPP
  26 #define SHARE_VM_GC_SHARED_GCCONFIGURATION_HPP
  27 
  28 #include "gc_interface/gcName.hpp"
  29 #include "memory/universe.hpp"
  30 #include "utilities/globalDefinitions.hpp"
  31 
  32 class GCConfiguration {
  33  public:
  34   GCName young_collector() const;
  35   GCName old_collector() const;
  36   uint num_parallel_gc_threads() const;
  37   uint num_concurrent_gc_threads() const;
  38   bool uses_dynamic_gc_threads() const;
  39   bool is_explicit_gc_concurrent() const;
  40   bool is_explicit_gc_disabled() const;
  41   uintx gc_time_ratio() const;
  42 
  43   bool has_pause_target_default_value() const;
  44   uintx pause_target() const;
  45 };
  46 
  47 class GCTLABConfiguration {
  48  public:
  49   bool uses_tlabs() const;
  50   size_t min_tlab_size() const;
  51   uint tlab_refill_waste_limit() const;
  52 };
  53 
  54 class GCSurvivorConfiguration {
  55  public:
  56   intx initial_tenuring_threshold() const;
  57   intx max_tenuring_threshold() const;
  58 };
  59 
  60 class GCHeapConfiguration {
  61  public:
  62   size_t max_size() const;
  63   size_t min_size() const;
  64   size_t initial_size() const;
  65   bool uses_compressed_oops() const;
  66   Universe::NARROW_OOP_MODE narrow_oop_mode() const;
  67   uint object_alignment_in_bytes() const;
  68   int heap_address_size_in_bits() const;
  69 };
  70 
  71 class GCYoungGenerationConfiguration {
  72  public:
  73   bool has_max_size_default_value() const;
  74   uintx max_size() const;
  75 
  76   uintx min_size() const;
  77   intx new_ratio() const;
  78 };
  79 
  80 #endif // SHARE_VM_GC_SHARED_GCCONFIGURATION_HPP