Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiUtil.hpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved. |
0 | 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 | |
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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). | |
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15 * You should have received a copy of the GNU General Public License version | |
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 /////////////////////////////////////////////////////////////// | |
26 // | |
27 // class JvmtiUtil | |
28 // | |
29 // class for miscellaneous jvmti utility static methods | |
30 // | |
31 | |
32 class JvmtiUtil : AllStatic { | |
33 | |
34 static ResourceArea* _single_threaded_resource_area; | |
35 | |
36 static const char* _error_names[]; | |
37 static const bool _event_threaded[]; | |
38 | |
39 public: | |
40 | |
41 static ResourceArea* single_threaded_resource_area(); | |
42 | |
43 static const char* error_name(int num) { return _error_names[num]; } // To Do: add range checking | |
44 | |
45 static const bool has_event_capability(jvmtiEvent event_type, const jvmtiCapabilities* capabilities_ptr); | |
46 | |
47 static const bool event_threaded(int num) { | |
48 if (num >= JVMTI_MIN_EVENT_TYPE_VAL && num <= JVMTI_MAX_EVENT_TYPE_VAL) { | |
49 return _event_threaded[num]; | |
50 } | |
51 if (num >= EXT_MIN_EVENT_TYPE_VAL && num <= EXT_MAX_EVENT_TYPE_VAL) { | |
52 return false; | |
53 } | |
54 ShouldNotReachHere(); | |
55 return false; | |
56 } | |
57 }; | |
58 | |
59 | |
60 /////////////////////////////////////////////////////////////// | |
61 // | |
62 // class SafeResourceMark | |
63 // | |
64 // ResourceMarks that work before threads exist | |
65 // | |
66 | |
67 class SafeResourceMark : public ResourceMark { | |
68 | |
69 ResourceArea* safe_resource_area() { | |
70 Thread* thread; | |
71 | |
72 if (Threads::number_of_threads() == 0) { | |
73 return JvmtiUtil::single_threaded_resource_area(); | |
74 } | |
75 thread = ThreadLocalStorage::thread(); | |
76 if (thread == NULL) { | |
77 return JvmtiUtil::single_threaded_resource_area(); | |
78 } | |
79 return thread->resource_area(); | |
80 } | |
81 | |
82 public: | |
83 | |
84 SafeResourceMark() : ResourceMark(safe_resource_area()) {} | |
85 | |
86 }; |