Wed, 02 Dec 2015 13:58:34 +0530
8065579: WB method to start G1 concurrent mark cycle should be introduced
Summary: Add a WhiteBox callback to the VM to start a concurrent mark cycle in G1.
Reviewed-by: tschatzl, sjohanss
Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
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
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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,
49 _wb_young_gc,
50 _wb_conc_mark,
51 _update_allocation_context_stats_inc,
52 _update_allocation_context_stats_full,
54 /* implementation independent, but reserved for GC use */
55 _no_gc,
56 _no_cause_specified,
57 _allocation_failure,
59 /* implementation specific */
61 _tenured_generation_full,
62 _metadata_GC_threshold,
64 _cms_generation_full,
65 _cms_initial_mark,
66 _cms_final_remark,
67 _cms_concurrent_mark,
69 _old_generation_expanded_on_last_scavenge,
70 _old_generation_too_full_to_scavenge,
71 _adaptive_size_policy,
73 _g1_inc_collection_pause,
74 _g1_humongous_allocation,
76 _last_ditch_collection,
77 _last_gc_cause
78 };
80 inline static bool is_user_requested_gc(GCCause::Cause cause) {
81 return (cause == GCCause::_java_lang_system_gc ||
82 cause == GCCause::_jvmti_force_gc);
83 }
85 inline static bool is_serviceability_requested_gc(GCCause::Cause
86 cause) {
87 return (cause == GCCause::_jvmti_force_gc ||
88 cause == GCCause::_heap_inspection ||
89 cause == GCCause::_heap_dump);
90 }
92 // Return a string describing the GCCause.
93 static const char* to_string(GCCause::Cause cause);
94 };
96 // Helper class for doing logging that includes the GC Cause
97 // as a string.
98 class GCCauseString : StackObj {
99 private:
100 static const int _length = 128;
101 char _buffer[_length];
102 int _position;
104 public:
105 GCCauseString(const char* prefix, GCCause::Cause cause) {
106 if (PrintGCCause) {
107 _position = jio_snprintf(_buffer, _length, "%s (%s) ", prefix, GCCause::to_string(cause));
108 } else {
109 _position = jio_snprintf(_buffer, _length, "%s ", prefix);
110 }
111 assert(_position >= 0 && _position <= _length,
112 err_msg("Need to increase the buffer size in GCCauseString? %d", _position));
113 }
115 GCCauseString& append(const char* str) {
116 int res = jio_snprintf(_buffer + _position, _length - _position, "%s", str);
117 _position += res;
118 assert(res >= 0 && _position <= _length,
119 err_msg("Need to increase the buffer size in GCCauseString? %d", res));
120 return *this;
121 }
123 operator const char*() {
124 return _buffer;
125 }
126 };
128 #endif // SHARE_VM_GC_INTERFACE_GCCAUSE_HPP