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src/share/vm/gc_implementation/g1/g1ErgoVerbose.hpp@a9647476d1a4
src/share/vm/gc_implementation/g1/g1ErgoVerbose.hpp
Wed, 15 Feb 2012 13:06:53 -0500
- author
- tonyp
- date
- Wed, 15 Feb 2012 13:06:53 -0500
- changeset 3539
- a9647476d1a4
- parent 3337
- 41406797186b
- child 3713
- 720b6a76dd9d
- permissions
- -rw-r--r--
7132029: G1: mixed GC phase lasts for longer than it should
Summary: Revamp of the mechanism that chooses old regions for inclusion in the CSet. It simplifies the code and introduces min and max bounds on the number of old regions added to the CSet at each mixed GC to avoid pathological cases. It also ensures that when we do a mixed GC we'll always find old regions to add to the CSet (i.e., it eliminates the case where a mixed GC will collect no old regions which can happen today).
Reviewed-by: johnc, brutisso
1 /*
2 * Copyright (c) 2011, 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.
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP
28 #include "memory/allocation.hpp"
29 #include "utilities/debug.hpp"
31 // The log of G1's heuristic decisions comprises of a series of
32 // records which have a similar format in order to maintain
33 // consistency across records and ultimately easier parsing of the
34 // output, if we ever choose to do that. Each record consists of:
35 // * A time stamp to be able to easily correlate each record with
36 // other events.
37 // * A unique string to allow us to easily identify such records.
38 // * The name of the heuristic the record corresponds to.
39 // * An action string which describes the action that G1 did or is
40 // about to do.
41 // * An optional reason string which describes the reason for the
42 // action.
43 // * An optional number of name/value pairs which contributed to the
44 // decision to take the action described in the record.
45 //
46 // Each record is associated with a "tag" which is the combination of
47 // the heuristic the record corresponds to, as well as the min level
48 // of verboseness at which the record should be printed. The tag is
49 // checked against the current settings to determine whether the record
50 // should be printed or not.
52 // The available verboseness levels.
53 typedef enum {
54 // Determine which part of the tag is occupied by the level.
55 ErgoLevelShift = 8,
56 ErgoLevelMask = ~((1 << ErgoLevelShift) - 1),
58 // ErgoLow is 0 so that we don't have to explicitly or a heuristic
59 // id with ErgoLow to keep its use simpler.
60 ErgoLow = 0,
61 ErgoHigh = 1 << ErgoLevelShift
62 } ErgoLevel;
64 // The available heuristics.
65 typedef enum {
66 // Determines which part of the tag is occupied by the heuristic id.
67 ErgoHeuristicMask = ~ErgoLevelMask,
69 ErgoHeapSizing = 0,
70 ErgoCSetConstruction,
71 ErgoConcCycles,
72 ErgoMixedGCs,
74 ErgoHeuristicNum
75 } ErgoHeuristic;
77 class G1ErgoVerbose : AllStatic {
78 private:
79 // Determines the minimum verboseness level at which records will be
80 // printed.
81 static ErgoLevel _level;
82 // Determines which heuristics are currently enabled.
83 static bool _enabled[ErgoHeuristicNum];
85 static ErgoLevel extract_level(int tag) {
86 return (ErgoLevel) (tag & ErgoLevelMask);
87 }
89 static ErgoHeuristic extract_heuristic(int tag) {
90 return (ErgoHeuristic) (tag & ErgoHeuristicMask);
91 }
93 public:
94 // Needs to be explicitly called at GC initialization.
95 static void initialize();
97 static void set_level(ErgoLevel level);
98 static void set_enabled(ErgoHeuristic h, bool enabled);
99 // It is applied to all heuristics.
100 static void set_enabled(bool enabled);
102 static bool enabled(int tag) {
103 ErgoLevel level = extract_level(tag);
104 ErgoHeuristic n = extract_heuristic(tag);
105 return level <= _level && _enabled[n];
106 }
108 // Extract the heuristic id from the tag and return a string with
109 // its name.
110 static const char* to_string(int tag);
111 };
113 // The macros below generate the format string for values of different
114 // types and/or metrics.
116 // The reason for the action is optional and is handled specially: the
117 // reason string is concatenated here so it's not necessary to pass it
118 // as a parameter.
119 #define ergo_format_reason(_reason_) ", reason: " _reason_
121 // Single parameter format strings
122 #define ergo_format_str(_name_) ", " _name_ ": %s"
123 #define ergo_format_region(_name_) ", " _name_ ": "SIZE_FORMAT" regions"
124 #define ergo_format_byte(_name_) ", " _name_ ": "SIZE_FORMAT" bytes"
125 #define ergo_format_double(_name_) ", " _name_ ": %1.2f"
126 #define ergo_format_perc(_name_) ", " _name_ ": %1.2f %%"
127 #define ergo_format_ms(_name_) ", " _name_ ": %1.2f ms"
129 // Double parameter format strings
130 #define ergo_format_byte_perc(_name_) \
131 ", " _name_ ": "SIZE_FORMAT" bytes (%1.2f %%)"
133 // Generates the format string
134 #define ergo_format(_extra_format_) \
135 " %1.3f: [G1Ergonomics (%s) %s" _extra_format_ "]"
137 // Conditionally, prints an ergonomic decision record. _extra_format_
138 // is the format string for the optional items we'd like to print
139 // (i.e., the decision's reason and any associated values). This
140 // string should be built up using the ergo_*_format macros (see
141 // above) to ensure consistency.
142 //
143 // Since we cannot rely on the compiler supporting variable argument
144 // macros, this macro accepts a fixed number of arguments and passes
145 // them to the print method. For convenience, we have wrapper macros
146 // below which take a specific number of arguments and set the rest to
147 // a default value.
148 #define ergo_verbose_common(_tag_, _action_, _extra_format_, \
149 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_) \
150 do { \
151 if (G1ErgoVerbose::enabled((_tag_))) { \
152 gclog_or_tty->print_cr(ergo_format(_extra_format_), \
153 os::elapsedTime(), \
154 G1ErgoVerbose::to_string((_tag_)), \
155 (_action_), \
156 (_arg0_), (_arg1_), (_arg2_), \
157 (_arg3_), (_arg4_), (_arg5_)); \
158 } \
159 } while (0)
162 #define ergo_verbose(_tag_, _action_) \
163 ergo_verbose_common(_tag_, _action_, "", 0, 0, 0, 0, 0, 0)
165 #define ergo_verbose0(_tag_, _action_, _extra_format_) \
166 ergo_verbose_common(_tag_, _action_, _extra_format_, 0, 0, 0, 0, 0, 0)
168 #define ergo_verbose1(_tag_, _action_, _extra_format_, \
169 _arg0_) \
170 ergo_verbose_common(_tag_, _action_, _extra_format_, \
171 _arg0_, 0, 0, 0, 0, 0)
173 #define ergo_verbose2(_tag_, _action_, _extra_format_, \
174 _arg0_, _arg1_) \
175 ergo_verbose_common(_tag_, _action_, _extra_format_, \
176 _arg0_, _arg1_, 0, 0, 0, 0)
178 #define ergo_verbose3(_tag_, _action_, _extra_format_, \
179 _arg0_, _arg1_, _arg2_) \
180 ergo_verbose_common(_tag_, _action_, _extra_format_, \
181 _arg0_, _arg1_, _arg2_, 0, 0, 0)
183 #define ergo_verbose4(_tag_, _action_, _extra_format_, \
184 _arg0_, _arg1_, _arg2_, _arg3_) \
185 ergo_verbose_common(_tag_, _action_, _extra_format_, \
186 _arg0_, _arg1_, _arg2_, _arg3_, 0, 0)
188 #define ergo_verbose5(_tag_, _action_, _extra_format_, \
189 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_) \
190 ergo_verbose_common(_tag_, _action_, _extra_format_, \
191 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, 0)
193 #define ergo_verbose6(_tag_, _action_, _extra_format_, \
194 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_) \
195 ergo_verbose_common(_tag_, _action_, _extra_format_, \
196 _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_)
198 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP
