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 #include "precompiled.hpp" 26 #include "gc_implementation/parallelScavenge/generationSizer.hpp" 27 #include "memory/collectorPolicy.hpp" 28 29 void GenerationSizer::trace_gen_sizes(const char* const str) { 30 if (TracePageSizes) { 31 tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " 32 SIZE_FORMAT "," SIZE_FORMAT " " 33 SIZE_FORMAT, 34 str, 35 _min_gen1_size / K, _max_gen1_size / K, 36 _min_gen0_size / K, _max_gen0_size / K, 37 _max_heap_byte_size / K); 38 } 39 } 40 41 void GenerationSizer::initialize_alignments() { 42 _space_alignment = _gen_alignment = default_gen_alignment(); 43 _heap_alignment = compute_heap_alignment(); 44 } 45 46 void GenerationSizer::initialize_flags() { 47 // Do basic sizing work 48 TwoGenerationCollectorPolicy::initialize_flags(); 49 50 assert(UseSerialGC || 51 !FLAG_IS_DEFAULT(ParallelGCThreads) || 52 (ParallelGCThreads > 0), 53 "ParallelGCThreads should be set before flag initialization"); 54 55 // The survivor ratio's are calculated "raw", unlike the 56 // default gc, which adds 2 to the ratio value. We need to 57 // make sure the values are valid before using them. 58 if (MinSurvivorRatio < 3) { 59 FLAG_SET_ERGO(uintx, MinSurvivorRatio, 3); 60 } 61 62 if (InitialSurvivorRatio < 3) { 63 FLAG_SET_ERGO(uintx, InitialSurvivorRatio, 3); 64 } 65 } 66 67 void GenerationSizer::initialize_size_info() { 68 trace_gen_sizes("ps heap raw"); 69 const size_t page_sz = os::page_size_for_region(_min_heap_byte_size, 70 _max_heap_byte_size, 71 8); 72 73 // Can a page size be something else than a power of two? 74 assert(is_power_of_2((intptr_t)page_sz), "must be a power of 2"); 75 size_t new_alignment = round_to(page_sz, _gen_alignment); 76 if (new_alignment != _gen_alignment) { 77 _gen_alignment = new_alignment; 78 _space_alignment = new_alignment; 79 // Redo everything from the start 80 initialize_flags(); 81 } 82 TwoGenerationCollectorPolicy::initialize_size_info(); 83 84 trace_gen_sizes("ps heap rnd"); 85 }