1 /*
   2  * Copyright (c) 2007, 2013, 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 #include "precompiled.hpp"
  26 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp"
  27 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp"
  28 #include "gc_implementation/concurrentMarkSweep/cmsGCAdaptivePolicyCounters.hpp"
  29 #include "gc_implementation/parNew/parNewGeneration.hpp"
  30 #include "gc_implementation/shared/gcPolicyCounters.hpp"
  31 #include "gc_implementation/shared/vmGCOperations.hpp"
  32 #include "memory/cardTableRS.hpp"
  33 #include "memory/collectorPolicy.hpp"
  34 #include "memory/gcLocker.inline.hpp"
  35 #include "memory/genCollectedHeap.hpp"
  36 #include "memory/generationSpec.hpp"
  37 #include "memory/space.hpp"
  38 #include "memory/universe.hpp"
  39 #include "runtime/arguments.hpp"
  40 #include "runtime/globals_extension.hpp"
  41 #include "runtime/handles.inline.hpp"
  42 #include "runtime/java.hpp"
  43 #include "runtime/thread.inline.hpp"
  44 #include "runtime/vmThread.hpp"
  45 
  46 //
  47 // ConcurrentMarkSweepPolicy methods
  48 //
  49 
  50 void ConcurrentMarkSweepPolicy::initialize_alignments() {
  51   _space_alignment = _gen_alignment = (uintx)Generation::GenGrain;
  52   _heap_alignment = compute_heap_alignment();
  53 }
  54 
  55 void ConcurrentMarkSweepPolicy::initialize_generations() {
  56   _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC, 0, AllocFailStrategy::RETURN_NULL);
  57   if (_generations == NULL)
  58     vm_exit_during_initialization("Unable to allocate gen spec");
  59 
  60   if (UseParNewGC) {
  61     if (UseAdaptiveSizePolicy) {
  62       _generations[0] = new GenerationSpec(Generation::ASParNew,
  63                                            _initial_young_size, _max_young_size);
  64     } else {
  65       _generations[0] = new GenerationSpec(Generation::ParNew,
  66                                            _initial_young_size, _max_young_size);
  67     }
  68   } else {
  69     _generations[0] = new GenerationSpec(Generation::DefNew,
  70                                          _initial_young_size, _max_young_size);
  71   }
  72   if (UseAdaptiveSizePolicy) {
  73     _generations[1] = new GenerationSpec(Generation::ASConcurrentMarkSweep,
  74                                          _initial_old_size, _max_old_size);
  75   } else {
  76     _generations[1] = new GenerationSpec(Generation::ConcurrentMarkSweep,
  77                                          _initial_old_size, _max_old_size);
  78   }
  79 
  80   if (_generations[0] == NULL || _generations[1] == NULL) {
  81     vm_exit_during_initialization("Unable to allocate gen spec");
  82   }
  83 }
  84 
  85 void ConcurrentMarkSweepPolicy::initialize_size_policy(size_t init_eden_size,
  86                                                size_t init_promo_size,
  87                                                size_t init_survivor_size) {
  88   double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0;
  89   double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0;
  90   _size_policy = new CMSAdaptiveSizePolicy(init_eden_size,
  91                                            init_promo_size,
  92                                            init_survivor_size,
  93                                            max_gc_minor_pause_sec,
  94                                            max_gc_pause_sec,
  95                                            GCTimeRatio);
  96 }
  97 
  98 void ConcurrentMarkSweepPolicy::initialize_gc_policy_counters() {
  99   // initialize the policy counters - 2 collectors, 3 generations
 100   if (UseParNewGC) {
 101     _gc_policy_counters = new GCPolicyCounters("ParNew:CMS", 2, 3);
 102   }
 103   else {
 104     _gc_policy_counters = new GCPolicyCounters("Copy:CMS", 2, 3);
 105   }
 106 }
 107 
 108 // Returns true if the incremental mode is enabled.
 109 bool ConcurrentMarkSweepPolicy::has_soft_ended_eden()
 110 {
 111   return CMSIncrementalMode;
 112 }
 113 
 114 
 115 //
 116 // ASConcurrentMarkSweepPolicy methods
 117 //
 118 
 119 void ASConcurrentMarkSweepPolicy::initialize_gc_policy_counters() {
 120 
 121   assert(size_policy() != NULL, "A size policy is required");
 122   // initialize the policy counters - 2 collectors, 3 generations
 123   if (UseParNewGC) {
 124     _gc_policy_counters = new CMSGCAdaptivePolicyCounters("ParNew:CMS", 2, 3,
 125       size_policy());
 126   }
 127   else {
 128     _gc_policy_counters = new CMSGCAdaptivePolicyCounters("Copy:CMS", 2, 3,
 129       size_policy());
 130   }
 131 }