1 /*
   2  * Copyright (c) 2017, 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 #include "precompiled.hpp"
  26 #include "gc/serial/defNewGeneration.inline.hpp"
  27 #include "gc/serial/serialHeap.hpp"
  28 #include "gc/serial/tenuredGeneration.inline.hpp"
  29 #include "gc/shared/genMemoryPools.hpp"
  30 #include "gc/shared/strongRootsScope.hpp"
  31 #include "memory/universe.hpp"
  32 #include "services/memoryManager.hpp"
  33 
  34 SerialHeap* SerialHeap::heap() {
  35   return named_heap<SerialHeap>(CollectedHeap::Serial);
  36 }
  37 
  38 SerialHeap::SerialHeap() :
  39     GenCollectedHeap(Generation::DefNew,
  40                      Generation::MarkSweepCompact,
  41                      "Copy:MSC"),
  42     _eden_pool(NULL),
  43     _survivor_pool(NULL),
  44     _old_pool(NULL) {
  45   _young_manager = new GCMemoryManager("Copy", "end of minor GC");
  46   _old_manager = new GCMemoryManager("MarkSweepCompact", "end of major GC");
  47 }
  48 
  49 void SerialHeap::initialize_serviceability() {
  50 
  51   DefNewGeneration* young = young_gen();
  52 
  53   // Add a memory pool for each space and young gen doesn't
  54   // support low memory detection as it is expected to get filled up.
  55   _eden_pool = new ContiguousSpacePool(young->eden(),
  56                                        "Eden Space",
  57                                        young->max_eden_size(),
  58                                        false /* support_usage_threshold */);
  59   _survivor_pool = new SurvivorContiguousSpacePool(young,
  60                                                    "Survivor Space",
  61                                                    young->max_survivor_size(),
  62                                                    false /* support_usage_threshold */);
  63   TenuredGeneration* old = old_gen();
  64   _old_pool = new GenerationPool(old, "Tenured Gen", true);
  65 
  66   _young_manager->add_pool(_eden_pool);
  67   _young_manager->add_pool(_survivor_pool);
  68   young->set_gc_manager(_young_manager);
  69 
  70   _old_manager->add_pool(_eden_pool);
  71   _old_manager->add_pool(_survivor_pool);
  72   _old_manager->add_pool(_old_pool);
  73   old->set_gc_manager(_old_manager);
  74 
  75 }
  76 
  77 GrowableArray<GCMemoryManager*> SerialHeap::memory_managers() {
  78   GrowableArray<GCMemoryManager*> memory_managers(2);
  79   memory_managers.append(_young_manager);
  80   memory_managers.append(_old_manager);
  81   return memory_managers;
  82 }
  83 
  84 GrowableArray<MemoryPool*> SerialHeap::memory_pools() {
  85   GrowableArray<MemoryPool*> memory_pools(3);
  86   memory_pools.append(_eden_pool);
  87   memory_pools.append(_survivor_pool);
  88   memory_pools.append(_old_pool);
  89   return memory_pools;
  90 }
  91 
  92 void SerialHeap::young_process_roots(StrongRootsScope* scope,
  93                                      OopIterateClosure* root_closure,
  94                                      OopIterateClosure* old_gen_closure,
  95                                      CLDClosure* cld_closure) {
  96   MarkingCodeBlobClosure mark_code_closure(root_closure, CodeBlobToOopClosure::FixRelocations);
  97 
  98   process_roots(scope, SO_ScavengeCodeCache, root_closure,
  99                 cld_closure, cld_closure, &mark_code_closure);
 100 
 101   if (_process_strong_tasks->try_claim_task(GCH_PS_younger_gens)) {
 102 
 103   }
 104 
 105   // When collection is parallel, all threads get to cooperate to do
 106   // old generation scanning.
 107   rem_set()->at_younger_refs_iterate();
 108   old_gen()->younger_refs_iterate(old_gen_closure, scope->n_threads());
 109 
 110   _process_strong_tasks->all_tasks_completed(scope->n_threads());
 111 }