Mon, 28 Jun 2010 14:13:17 -0400
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
1 /*
2 * Copyright (c) 2002, 2005, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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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).
14 *
15 * You should have received a copy of the GNU General Public License version
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23 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_gcCause.cpp.incl"
28 const char* GCCause::to_string(GCCause::Cause cause) {
29 switch (cause) {
30 case _java_lang_system_gc:
31 return "System.gc()";
33 case _full_gc_alot:
34 return "FullGCAlot";
36 case _scavenge_alot:
37 return "ScavengeAlot";
39 case _allocation_profiler:
40 return "Allocation Profiler";
42 case _jvmti_force_gc:
43 return "JvmtiEnv ForceGarbageCollection";
45 case _no_gc:
46 return "No GC";
48 case _allocation_failure:
49 return "Allocation Failure";
51 case _gc_locker:
52 return "GCLocker Initiated GC";
54 case _heap_inspection:
55 return "Heap Inspection Initiated GC";
57 case _heap_dump:
58 return "Heap Dump Initiated GC";
60 case _tenured_generation_full:
61 return "Tenured Generation Full";
63 case _permanent_generation_full:
64 return "Permanent Generation Full";
66 case _cms_generation_full:
67 return "CMS Generation Full";
69 case _cms_initial_mark:
70 return "CMS Initial Mark";
72 case _cms_final_remark:
73 return "CMS Final Remark";
75 case _old_generation_expanded_on_last_scavenge:
76 return "Old Generation Expanded On Last Scavenge";
78 case _old_generation_too_full_to_scavenge:
79 return "Old Generation Too Full To Scavenge";
81 case _g1_inc_collection_pause:
82 return "G1 Evacuation Pause";
84 case _last_ditch_collection:
85 return "Last ditch collection";
87 case _last_gc_cause:
88 return "ILLEGAL VALUE - last gc cause - ILLEGAL VALUE";
90 default:
91 return "unknown GCCause";
92 }
93 ShouldNotReachHere();
94 }
96 #ifndef PRODUCT
98 bool GCCause::is_for_full_collection(GCCause::Cause cause) {
99 bool result;
101 // There are more GCCause::Cause types than listed here.
102 // For brevity, we list only those that cause full collections.
103 switch (cause) {
104 case _allocation_failure:
105 case _tenured_generation_full:
106 case _permanent_generation_full:
107 case _cms_generation_full:
108 case _last_ditch_collection:
109 result = true;
110 break;
112 default:
113 result = false;
114 break;
115 }
116 return result;
117 }
119 #endif // PRODUCT