Wed, 27 Apr 2016 01:25:04 +0800
Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17
1 /*
2 * Copyright (c) 2002, 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 */
25 #ifndef SHARE_VM_GC_INTERFACE_GCCAUSE_HPP
26 #define SHARE_VM_GC_INTERFACE_GCCAUSE_HPP
28 #include "memory/allocation.hpp"
30 //
31 // This class exposes implementation details of the various
32 // collector(s), and we need to be very careful with it. If
33 // use of this class grows, we should split it into public
34 // and implemenation-private "causes".
35 //
37 class GCCause : public AllStatic {
38 public:
39 enum Cause {
40 /* public */
41 _java_lang_system_gc,
42 _full_gc_alot,
43 _scavenge_alot,
44 _allocation_profiler,
45 _jvmti_force_gc,
46 _gc_locker,
47 _heap_inspection,
48 _heap_dump,
50 /* implementation independent, but reserved for GC use */
51 _no_gc,
52 _no_cause_specified,
53 _allocation_failure,
55 /* implementation specific */
57 _tenured_generation_full,
58 _metadata_GC_threshold,
60 _cms_generation_full,
61 _cms_initial_mark,
62 _cms_final_remark,
63 _cms_concurrent_mark,
65 _old_generation_expanded_on_last_scavenge,
66 _old_generation_too_full_to_scavenge,
67 _adaptive_size_policy,
69 _g1_inc_collection_pause,
70 _g1_humongous_allocation,
72 _last_ditch_collection,
73 _last_gc_cause
74 };
76 inline static bool is_user_requested_gc(GCCause::Cause cause) {
77 return (cause == GCCause::_java_lang_system_gc ||
78 cause == GCCause::_jvmti_force_gc);
79 }
81 inline static bool is_serviceability_requested_gc(GCCause::Cause
82 cause) {
83 return (cause == GCCause::_jvmti_force_gc ||
84 cause == GCCause::_heap_inspection ||
85 cause == GCCause::_heap_dump);
86 }
88 // Return a string describing the GCCause.
89 static const char* to_string(GCCause::Cause cause);
90 };
92 // Helper class for doing logging that includes the GC Cause
93 // as a string.
94 class GCCauseString : StackObj {
95 private:
96 static const int _length = 128;
97 char _buffer[_length];
98 int _position;
100 public:
101 GCCauseString(const char* prefix, GCCause::Cause cause) {
102 if (PrintGCCause) {
103 _position = jio_snprintf(_buffer, _length, "%s (%s) ", prefix, GCCause::to_string(cause));
104 } else {
105 _position = jio_snprintf(_buffer, _length, "%s ", prefix);
106 }
107 assert(_position >= 0 && _position <= _length,
108 err_msg("Need to increase the buffer size in GCCauseString? %d", _position));
109 }
111 GCCauseString& append(const char* str) {
112 int res = jio_snprintf(_buffer + _position, _length - _position, "%s", str);
113 _position += res;
114 assert(res >= 0 && _position <= _length,
115 err_msg("Need to increase the buffer size in GCCauseString? %d", res));
116 return *this;
117 }
119 operator const char*() {
120 return _buffer;
121 }
122 };
124 #endif // SHARE_VM_GC_INTERFACE_GCCAUSE_HPP