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src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp@5788dbd1f2d6 (annotated)
src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp
Fri, 16 Jan 2015 10:29:12 +0100
- author
- ehelin
- date
- Fri, 16 Jan 2015 10:29:12 +0100
- changeset 7780
- 5788dbd1f2d6
- parent 7778
- c2ce24504334
- child 7994
- 04ff2f6cd0eb
- permissions
- -rw-r--r--
8066875: VirtualSpace does not use large pages
Reviewed-by: stefank, tschatzl, anoll, thartmann
| jwilhelm@6085 | 1 | /* |
| jwilhelm@6085 | 2 | * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| jwilhelm@6085 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| jwilhelm@6085 | 4 | * |
| jwilhelm@6085 | 5 | * This code is free software; you can redistribute it and/or modify it |
| jwilhelm@6085 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| jwilhelm@6085 | 7 | * published by the Free Software Foundation. |
| jwilhelm@6085 | 8 | * |
| jwilhelm@6085 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| jwilhelm@6085 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| jwilhelm@6085 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| jwilhelm@6085 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| jwilhelm@6085 | 13 | * accompanied this code). |
| jwilhelm@6085 | 14 | * |
| jwilhelm@6085 | 15 | * You should have received a copy of the GNU General Public License version |
| jwilhelm@6085 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| jwilhelm@6085 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| jwilhelm@6085 | 18 | * |
| jwilhelm@6085 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| jwilhelm@6085 | 20 | * or visit www.oracle.com if you need additional information or have any |
| jwilhelm@6085 | 21 | * questions. |
| jwilhelm@6085 | 22 | * |
| jwilhelm@6085 | 23 | */ |
| jwilhelm@6085 | 24 | |
| jwilhelm@6085 | 25 | #include "precompiled.hpp" |
| jwilhelm@6085 | 26 | #include "gc_implementation/parallelScavenge/generationSizer.hpp" |
| jwilhelm@6085 | 27 | #include "memory/collectorPolicy.hpp" |
| jwilhelm@6085 | 28 | |
| jwilhelm@6085 | 29 | void GenerationSizer::trace_gen_sizes(const char* const str) { |
| jwilhelm@6085 | 30 | if (TracePageSizes) { |
| jwilhelm@6085 | 31 | tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " " |
| jwilhelm@6085 | 32 | SIZE_FORMAT "," SIZE_FORMAT " " |
| jwilhelm@6085 | 33 | SIZE_FORMAT, |
| jwilhelm@6085 | 34 | str, |
| jwilhelm@6085 | 35 | _min_gen1_size / K, _max_gen1_size / K, |
| jwilhelm@6085 | 36 | _min_gen0_size / K, _max_gen0_size / K, |
| jwilhelm@6085 | 37 | _max_heap_byte_size / K); |
| jwilhelm@6085 | 38 | } |
| jwilhelm@6085 | 39 | } |
| jwilhelm@6085 | 40 | |
| jwilhelm@6085 | 41 | void GenerationSizer::initialize_alignments() { |
| jwilhelm@6085 | 42 | _space_alignment = _gen_alignment = default_gen_alignment(); |
| jwilhelm@6085 | 43 | _heap_alignment = compute_heap_alignment(); |
| jwilhelm@6085 | 44 | } |
| jwilhelm@6085 | 45 | |
| jwilhelm@6085 | 46 | void GenerationSizer::initialize_flags() { |
| jwilhelm@6085 | 47 | // Do basic sizing work |
| jwilhelm@6085 | 48 | TwoGenerationCollectorPolicy::initialize_flags(); |
| jwilhelm@6085 | 49 | |
| jwilhelm@6085 | 50 | assert(UseSerialGC || |
| jwilhelm@6085 | 51 | !FLAG_IS_DEFAULT(ParallelGCThreads) || |
| jwilhelm@6085 | 52 | (ParallelGCThreads > 0), |
| jwilhelm@6085 | 53 | "ParallelGCThreads should be set before flag initialization"); |
| jwilhelm@6085 | 54 | |
| jwilhelm@6085 | 55 | // The survivor ratio's are calculated "raw", unlike the |
| jwilhelm@6085 | 56 | // default gc, which adds 2 to the ratio value. We need to |
| jwilhelm@6085 | 57 | // make sure the values are valid before using them. |
| jwilhelm@6085 | 58 | if (MinSurvivorRatio < 3) { |
| jwilhelm@6085 | 59 | FLAG_SET_ERGO(uintx, MinSurvivorRatio, 3); |
| jwilhelm@6085 | 60 | } |
| jwilhelm@6085 | 61 | |
| jwilhelm@6085 | 62 | if (InitialSurvivorRatio < 3) { |
| jwilhelm@6085 | 63 | FLAG_SET_ERGO(uintx, InitialSurvivorRatio, 3); |
| jwilhelm@6085 | 64 | } |
| jwilhelm@6085 | 65 | } |
| jwilhelm@6085 | 66 | |
| jwilhelm@6085 | 67 | void GenerationSizer::initialize_size_info() { |
| jwilhelm@6085 | 68 | trace_gen_sizes("ps heap raw"); |
| ehelin@7780 | 69 | const size_t max_page_sz = os::page_size_for_region_aligned(_max_heap_byte_size, 8); |
| ehelin@7778 | 70 | const size_t min_pages = 4; // 1 for eden + 1 for each survivor + 1 for old |
| ehelin@7780 | 71 | const size_t min_page_sz = os::page_size_for_region_aligned(_min_heap_byte_size, min_pages); |
| ehelin@7778 | 72 | const size_t page_sz = MIN2(max_page_sz, min_page_sz); |
| jwilhelm@6085 | 73 | |
| jwilhelm@6085 | 74 | // Can a page size be something else than a power of two? |
| jwilhelm@6085 | 75 | assert(is_power_of_2((intptr_t)page_sz), "must be a power of 2"); |
| jwilhelm@6085 | 76 | size_t new_alignment = round_to(page_sz, _gen_alignment); |
| jwilhelm@6085 | 77 | if (new_alignment != _gen_alignment) { |
| jwilhelm@6085 | 78 | _gen_alignment = new_alignment; |
| sjohanss@6094 | 79 | _space_alignment = new_alignment; |
| jwilhelm@6085 | 80 | // Redo everything from the start |
| jwilhelm@6085 | 81 | initialize_flags(); |
| jwilhelm@6085 | 82 | } |
| jwilhelm@6085 | 83 | TwoGenerationCollectorPolicy::initialize_size_info(); |
| jwilhelm@6085 | 84 | |
| jwilhelm@6085 | 85 | trace_gen_sizes("ps heap rnd"); |
| jwilhelm@6085 | 86 | } |
