1 /* 2 * Copyright (c) 2001, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GENERATIONSIZER_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GENERATIONSIZER_HPP 27 28 #include "memory/collectorPolicy.hpp" 29 30 // There is a nice batch of tested generation sizing code in 31 // TwoGenerationCollectorPolicy. Lets reuse it! 32 33 class GenerationSizer : public TwoGenerationCollectorPolicy { 34 public: 35 GenerationSizer() { 36 // Partial init only! 37 initialize_flags(); 38 initialize_size_info(); 39 } 40 41 void initialize_flags() { 42 // Do basic sizing work 43 this->TwoGenerationCollectorPolicy::initialize_flags(); 44 45 // If the user hasn't explicitly set the number of worker 46 // threads, set the count. 47 assert(UseSerialGC || 48 !FLAG_IS_DEFAULT(ParallelGCThreads) || 49 (ParallelGCThreads > 0), 50 "ParallelGCThreads should be set before flag initialization"); 51 52 // The survivor ratio's are calculated "raw", unlike the 53 // default gc, which adds 2 to the ratio value. We need to 54 // make sure the values are valid before using them. 55 if (MinSurvivorRatio < 3) { 56 MinSurvivorRatio = 3; 57 } 58 59 if (InitialSurvivorRatio < 3) { 60 InitialSurvivorRatio = 3; 61 } 62 } 63 64 size_t min_young_gen_size() { return _min_gen0_size; } 65 size_t young_gen_size() { return _initial_gen0_size; } 66 size_t max_young_gen_size() { return _max_gen0_size; } 67 68 size_t min_old_gen_size() { return _min_gen1_size; } 69 size_t old_gen_size() { return _initial_gen1_size; } 70 size_t max_old_gen_size() { return _max_gen1_size; } 71 }; 72 73 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GENERATIONSIZER_HPP