| /* |
| * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc/parallel/generationSizer.hpp" |
| #include "gc/shared/collectorPolicy.hpp" |
| |
| void GenerationSizer::trace_gen_sizes(const char* const str) { |
| if (TracePageSizes) { |
| tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " |
| SIZE_FORMAT "," SIZE_FORMAT " " |
| SIZE_FORMAT, |
| str, |
| _min_old_size / K, _max_old_size / K, |
| _min_young_size / K, _max_young_size / K, |
| _max_heap_byte_size / K); |
| } |
| } |
| |
| void GenerationSizer::initialize_alignments() { |
| _space_alignment = _gen_alignment = default_gen_alignment(); |
| _heap_alignment = compute_heap_alignment(); |
| } |
| |
| void GenerationSizer::initialize_flags() { |
| // Do basic sizing work |
| GenCollectorPolicy::initialize_flags(); |
| |
| // The survivor ratio's are calculated "raw", unlike the |
| // default gc, which adds 2 to the ratio value. We need to |
| // make sure the values are valid before using them. |
| if (MinSurvivorRatio < 3) { |
| FLAG_SET_ERGO(uintx, MinSurvivorRatio, 3); |
| } |
| |
| if (InitialSurvivorRatio < 3) { |
| FLAG_SET_ERGO(uintx, InitialSurvivorRatio, 3); |
| } |
| } |
| |
| void GenerationSizer::initialize_size_info() { |
| trace_gen_sizes("ps heap raw"); |
| const size_t max_page_sz = os::page_size_for_region_aligned(_max_heap_byte_size, 8); |
| const size_t min_pages = 4; // 1 for eden + 1 for each survivor + 1 for old |
| const size_t min_page_sz = os::page_size_for_region_aligned(_min_heap_byte_size, min_pages); |
| const size_t page_sz = MIN2(max_page_sz, min_page_sz); |
| |
| // Can a page size be something else than a power of two? |
| assert(is_power_of_2((intptr_t)page_sz), "must be a power of 2"); |
| size_t new_alignment = round_to(page_sz, _gen_alignment); |
| if (new_alignment != _gen_alignment) { |
| _gen_alignment = new_alignment; |
| _space_alignment = new_alignment; |
| // Redo everything from the start |
| initialize_flags(); |
| } |
| GenCollectorPolicy::initialize_size_info(); |
| |
| trace_gen_sizes("ps heap rnd"); |
| } |