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comparison src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp @ 13060:8f07aa079343

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8016309: assert(eden_size > 0 && survivor_size > 0) failed: just checking 7057939: jmap shows MaxNewSize=4GB when Java is using parallel collector Summary: Major cleanup of the collectorpolicy classes Reviewed-by: tschatzl, jcoomes
author jwilhelm
date Fri, 01 Nov 2013 17:09:38 +0100
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children ee527493b36d
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13059:46d7652b223c 13060:8f07aa079343
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 // Redo everything from the start
79 initialize_flags();
80 }
81 TwoGenerationCollectorPolicy::initialize_size_info();
82
83 trace_gen_sizes("ps heap rnd");
84 }