1 /*
   2  * Copyright (c) 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 #include "precompiled.hpp"
  26 #include "gc/g1/g1CollectedHeap.hpp"
  27 #include "gc/g1/g1HeterogeneousHeapPolicy.hpp"
  28 #include "gc/g1/g1Policy.hpp"
  29 #include "gc/g1/heterogeneousHeapRegionManager.hpp"
  30 
  31 G1HeterogeneousHeapPolicy::G1HeterogeneousHeapPolicy(STWGCTimer* gc_timer) :
  32   G1Policy(gc_timer), _manager(NULL) {}
  33 
  34 // We call the super class init(), after which we provision young_list_target_length() regions in dram.
  35 void G1HeterogeneousHeapPolicy::init(G1CollectedHeap* g1h, G1CollectionSet* collection_set) {
  36   G1Policy::init(g1h, collection_set);
  37   _manager = HeterogeneousHeapRegionManager::manager();
  38   _manager->adjust_dram_regions((uint)young_list_target_length(), G1CollectedHeap::heap()->workers());
  39 }
  40 
  41 // After a collection pause, young list target length is updated. So we need to make sure we have enough regions in dram for young gen.
  42 void G1HeterogeneousHeapPolicy::record_collection_pause_end(double pause_time_ms, size_t cards_scanned, size_t heap_used_bytes_before_gc) {
  43   G1Policy::record_collection_pause_end(pause_time_ms, cards_scanned, heap_used_bytes_before_gc);
  44   _manager->adjust_dram_regions((uint)young_list_target_length(), G1CollectedHeap::heap()->workers());
  45 }
  46 
  47 // After a full collection, young list target length is updated. So we need to make sure we have enough regions in dram for young gen.
  48 void G1HeterogeneousHeapPolicy::record_full_collection_end() {
  49   G1Policy::record_full_collection_end();
  50   _manager->adjust_dram_regions((uint)young_list_target_length(), G1CollectedHeap::heap()->workers());
  51 }
  52 
  53 bool G1HeterogeneousHeapPolicy::force_upgrade_to_full() {
  54   if (_manager->has_borrowed_regions()) {
  55     return true;
  56   }
  57   return false;
  58 }