1 /*
   2  * Copyright (c) 2007, 2014, 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/shared/adaptiveSizePolicy.hpp"
  27 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp"
  28 #include "gc_implementation/parNew/parNewGeneration.hpp"
  29 #include "gc_implementation/shared/gcPolicyCounters.hpp"
  30 #include "gc_implementation/shared/vmGCOperations.hpp"
  31 #include "memory/cardTableRS.hpp"
  32 #include "memory/collectorPolicy.hpp"
  33 #include "memory/gcLocker.inline.hpp"
  34 #include "memory/genCollectedHeap.hpp"
  35 #include "memory/generationSpec.hpp"
  36 #include "memory/space.hpp"
  37 #include "memory/universe.hpp"
  38 #include "runtime/arguments.hpp"
  39 #include "runtime/globals_extension.hpp"
  40 #include "runtime/handles.inline.hpp"
  41 #include "runtime/java.hpp"
  42 #include "runtime/thread.inline.hpp"
  43 #include "runtime/vmThread.hpp"
  44 
  45 //
  46 // ConcurrentMarkSweepPolicy methods
  47 //
  48 
  49 void ConcurrentMarkSweepPolicy::initialize_alignments() {
  50   _space_alignment = _gen_alignment = (uintx)Generation::GenGrain;
  51   _heap_alignment = compute_heap_alignment();
  52 }
  53 
  54 void ConcurrentMarkSweepPolicy::initialize_generations() {
  55   _generations = NEW_C_HEAP_ARRAY3(GenerationSpecPtr, number_of_generations(), mtGC,
  56     CURRENT_PC, AllocFailStrategy::RETURN_NULL);
  57   if (_generations == NULL)
  58     vm_exit_during_initialization("Unable to allocate gen spec");
  59 
  60   Generation::Name yg_name =
  61     UseParNewGC ? Generation::ParNew : Generation::DefNew;
  62   _generations[0] = new GenerationSpec(yg_name, _initial_young_size,
  63                                        _max_young_size);
  64   _generations[1] = new GenerationSpec(Generation::ConcurrentMarkSweep,
  65                                        _initial_old_size, _max_old_size);
  66 
  67   if (_generations[0] == NULL || _generations[1] == NULL) {
  68     vm_exit_during_initialization("Unable to allocate gen spec");
  69   }
  70 }
  71 
  72 void ConcurrentMarkSweepPolicy::initialize_size_policy(size_t init_eden_size,
  73                                                size_t init_promo_size,
  74                                                size_t init_survivor_size) {
  75   double max_gc_pause_sec = ((double) MaxGCPauseMillis)/1000.0;
  76   _size_policy = new AdaptiveSizePolicy(init_eden_size,
  77                                         init_promo_size,
  78                                         init_survivor_size,
  79                                         max_gc_pause_sec,
  80                                         GCTimeRatio);
  81 }
  82 
  83 void ConcurrentMarkSweepPolicy::initialize_gc_policy_counters() {
  84   // initialize the policy counters - 2 collectors, 3 generations
  85   if (UseParNewGC) {
  86     _gc_policy_counters = new GCPolicyCounters("ParNew:CMS", 2, 3);
  87   }
  88   else {
  89     _gc_policy_counters = new GCPolicyCounters("Copy:CMS", 2, 3);
  90   }
  91 }
  92 
  93 // Returns true if the incremental mode is enabled.
  94 bool ConcurrentMarkSweepPolicy::has_soft_ended_eden()
  95 {
  96   return CMSIncrementalMode;
  97 }