1 /*
2 * Copyright (c) 2017, 2018, 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/z/zArguments.hpp"
27 #include "gc/z/zCollectedHeap.hpp"
28 #include "gc/z/zCollectorPolicy.hpp"
29 #include "gc/z/zWorkers.hpp"
30 #include "gc/shared/gcArguments.inline.hpp"
31 #include "runtime/globals.hpp"
32 #include "runtime/globals_extension.hpp"
33
34 size_t ZArguments::conservative_max_heap_alignment() {
35 return 0;
36 }
37
38 void ZArguments::initialize() {
39 GCArguments::initialize();
40
41 // Enable NUMA by default
42 if (FLAG_IS_DEFAULT(UseNUMA)) {
43 FLAG_SET_DEFAULT(UseNUMA, true);
44 }
45
46 // Disable biased locking by default
47 if (FLAG_IS_DEFAULT(UseBiasedLocking)) {
48 FLAG_SET_DEFAULT(UseBiasedLocking, false);
49 }
50
51 // Select number of parallel threads
52 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
53 FLAG_SET_DEFAULT(ParallelGCThreads, ZWorkers::calculate_nparallel());
54 }
55
56 if (ParallelGCThreads == 0) {
57 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ParallelGCThreads=0");
58 }
59
60 // Select number of concurrent threads
61 if (FLAG_IS_DEFAULT(ConcGCThreads)) {
62 FLAG_SET_DEFAULT(ConcGCThreads, ZWorkers::calculate_nconcurrent());
63 }
64
65 if (ConcGCThreads == 0) {
66 vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ConcGCThreads=0");
67 }
68
69 #ifdef COMPILER2
70 // Enable loop strip mining by default
71 if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) {
72 FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true);
73 if (FLAG_IS_DEFAULT(LoopStripMiningIter)) {
74 FLAG_SET_DEFAULT(LoopStripMiningIter, 1000);
75 }
76 }
77 #endif
78
79 // To avoid asserts in set_active_workers()
80 FLAG_SET_DEFAULT(UseDynamicNumberOfGCThreads, true);
81
82 // CompressedOops/UseCompressedClassPointers not supported
83 FLAG_SET_DEFAULT(UseCompressedOops, false);
84 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
85
86 // Verification before startup and after exit not (yet) supported
87 FLAG_SET_DEFAULT(VerifyDuringStartup, false);
88 FLAG_SET_DEFAULT(VerifyBeforeExit, false);
89
90 // Verification before heap iteration not (yet) supported, for the
91 // same reason we need fixup_partial_loads
92 FLAG_SET_DEFAULT(VerifyBeforeIteration, false);
93
94 // Verification of stacks not (yet) supported, for the same reason
95 // we need fixup_partial_loads
96 DEBUG_ONLY(FLAG_SET_DEFAULT(VerifyStack, false));
97 }
98
99 CollectedHeap* ZArguments::create_heap() {
100 return create_heap_with_policy<ZCollectedHeap, ZCollectorPolicy>();
101 }