1/*
2 * Copyright (c) 2017, 2018, Red Hat, Inc. 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/epsilon/epsilonArguments.hpp"
27#include "gc/epsilon/epsilonHeap.hpp"
28#include "gc/shared/gcArguments.hpp"
29#include "runtime/globals.hpp"
30#include "runtime/globals_extension.hpp"
31#include "runtime/vm_version.hpp"
32#include "utilities/macros.hpp"
33
34size_t EpsilonArguments::conservative_max_heap_alignment() {
35 return UseLargePages ? os::large_page_size() : os::vm_page_size();
36}
37
38void EpsilonArguments::initialize() {
39 GCArguments::initialize();
40
41 assert(UseEpsilonGC, "Sanity");
42
43 // Forcefully exit when OOME is detected. Nothing we can do at that point.
44 if (FLAG_IS_DEFAULT(ExitOnOutOfMemoryError)) {
45 FLAG_SET_DEFAULT(ExitOnOutOfMemoryError, true);
46 }
47
48 if (EpsilonMaxTLABSize < MinTLABSize) {
49 warning("EpsilonMaxTLABSize < MinTLABSize, adjusting it to " SIZE_FORMAT, MinTLABSize);
50 EpsilonMaxTLABSize = MinTLABSize;
51 }
52
53 if (!EpsilonElasticTLAB && EpsilonElasticTLABDecay) {
54 warning("Disabling EpsilonElasticTLABDecay because EpsilonElasticTLAB is disabled");
55 FLAG_SET_DEFAULT(EpsilonElasticTLABDecay, false);
56 }
57
58#ifdef COMPILER2
59 // Enable loop strip mining: there are still non-GC safepoints, no need to make it worse
60 if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) {
61 FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true);
62 if (FLAG_IS_DEFAULT(LoopStripMiningIter)) {
63 FLAG_SET_DEFAULT(LoopStripMiningIter, 1000);
64 }
65 }
66#endif
67}
68
69void EpsilonArguments::initialize_alignments() {
70 size_t page_size = UseLargePages ? os::large_page_size() : os::vm_page_size();
71 size_t align = MAX2((size_t)os::vm_allocation_granularity(), page_size);
72 SpaceAlignment = align;
73 HeapAlignment = align;
74}
75
76CollectedHeap* EpsilonArguments::create_heap() {
77 return new EpsilonHeap();
78}
79