1 /* 2 * Copyright (c) 2001, 2008, 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 // There is a nice batch of tested generation sizing code in 26 // TwoGenerationCollectorPolicy. Lets reuse it! 27 28 class GenerationSizer : public TwoGenerationCollectorPolicy { 29 public: 30 GenerationSizer() { 31 // Partial init only! 32 initialize_flags(); 33 initialize_size_info(); 34 } 35 36 void initialize_flags() { 37 // Do basic sizing work 38 this->TwoGenerationCollectorPolicy::initialize_flags(); 39 40 // If the user hasn't explicitly set the number of worker 41 // threads, set the count. 42 assert(UseSerialGC || 43 !FLAG_IS_DEFAULT(ParallelGCThreads) || 44 (ParallelGCThreads > 0), 45 "ParallelGCThreads should be set before flag initialization"); 46 47 // The survivor ratio's are calculated "raw", unlike the 48 // default gc, which adds 2 to the ratio value. We need to 49 // make sure the values are valid before using them. 50 if (MinSurvivorRatio < 3) { 51 MinSurvivorRatio = 3; 52 } 53 54 if (InitialSurvivorRatio < 3) { 55 InitialSurvivorRatio = 3; 56 } 57 } 58 59 size_t min_young_gen_size() { return _min_gen0_size; } 60 size_t young_gen_size() { return _initial_gen0_size; } 61 size_t max_young_gen_size() { return _max_gen0_size; } 62 63 size_t min_old_gen_size() { return _min_gen1_size; } 64 size_t old_gen_size() { return _initial_gen1_size; } 65 size_t max_old_gen_size() { return _max_gen1_size; } 66 67 size_t perm_gen_size() { return PermSize; } 68 size_t max_perm_gen_size() { return MaxPermSize; } 69 };