Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiRedefineClassesTrace.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | 6b19fe41b577 |
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| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2003, 2013, 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 | |
| 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_PRIMS_JVMTIREDEFINECLASSESTRACE_HPP |
| 26 #define SHARE_VM_PRIMS_JVMTIREDEFINECLASSESTRACE_HPP | |
| 27 | |
| 0 | 28 // RedefineClasses tracing support via the TraceRedefineClasses |
| 29 // option. A bit is assigned to each group of trace messages. | |
| 30 // Groups of messages are individually selectable. We have to use | |
| 31 // decimal values on the command line since the command option | |
| 32 // parsing logic doesn't like non-decimal numerics. The HEX values | |
| 33 // are used in the actual RC_TRACE() calls for sanity. To achieve | |
| 34 // the old cumulative behavior, pick the level after the one in | |
| 35 // which you are interested and subtract one, e.g., 33554431 will | |
| 36 // print every tracing message. | |
| 37 // | |
| 38 // 0x00000000 | 0 - default; no tracing messages | |
| 39 // 0x00000001 | 1 - name each target class before loading, after | |
| 40 // loading and after redefinition is completed | |
| 41 // 0x00000002 | 2 - print info if parsing, linking or | |
| 42 // verification throws an exception | |
| 43 // 0x00000004 | 4 - print timer info for the VM operation | |
| 44 // 0x00000008 | 8 - print subclass counter updates | |
| 45 // 0x00000010 | 16 - unused | |
| 46 // 0x00000020 | 32 - unused | |
| 47 // 0x00000040 | 64 - unused | |
| 48 // 0x00000080 | 128 - unused | |
| 49 // 0x00000100 | 256 - previous class weak reference addition | |
| 50 // 0x00000200 | 512 - previous class weak reference mgmt during | |
| 51 // class unloading checks (GC) | |
| 52 // 0x00000400 | 1024 - previous class weak reference mgmt during | |
| 53 // add previous ops (GC) | |
| 54 // 0x00000800 | 2048 - previous class breakpoint mgmt | |
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55 // 0x00001000 | 4096 - detect calls to obsolete methods |
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56 // 0x00002000 | 8192 - fail a guarantee() in addition to detection |
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57 // 0x00004000 | 16384 - detect old/obsolete methods in metadata |
| 0 | 58 // 0x00008000 | 32768 - old/new method matching/add/delete |
| 59 // 0x00010000 | 65536 - impl details: CP size info | |
| 60 // 0x00020000 | 131072 - impl details: CP merge pass info | |
| 61 // 0x00040000 | 262144 - impl details: CP index maps | |
| 62 // 0x00080000 | 524288 - impl details: modified CP index values | |
| 63 // 0x00100000 | 1048576 - impl details: vtable updates | |
| 64 // 0x00200000 | 2097152 - impl details: itable updates | |
| 65 // 0x00400000 | 4194304 - impl details: constant pool cache updates | |
| 66 // 0x00800000 | 8388608 - impl details: methodComparator info | |
| 67 // 0x01000000 | 16777216 - impl details: nmethod evolution info | |
| 68 // 0x02000000 | 33554432 - impl details: annotation updates | |
| 69 // 0x04000000 | 67108864 - impl details: StackMapTable updates | |
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70 // 0x08000000 | 134217728 - impl details: OopMapCache updates |
| 0 | 71 // 0x10000000 | 268435456 - unused |
| 72 // 0x20000000 | 536870912 - unused | |
| 73 // 0x40000000 | 1073741824 - unused | |
| 74 // 0x80000000 | 2147483648 - unused | |
| 75 | |
| 76 // Macro for checking if TraceRedefineClasses has a specific bit | |
| 77 // enabled. Returns true if the bit specified by level is set. | |
| 78 #define RC_TRACE_ENABLED(level) ((TraceRedefineClasses & level) != 0) | |
| 79 | |
| 80 // Macro for checking if TraceRedefineClasses has one or more bits | |
| 81 // set in a range of bit values. Returns true if one or more bits | |
| 82 // is set in the range from low..high inclusive. Assumes that low | |
| 83 // and high are single bit values. | |
| 84 // | |
| 85 // ((high << 1) - 1) | |
| 86 // Yields a mask that removes bits greater than the high bit value. | |
| 87 // This algorithm doesn't work with highest bit. | |
| 88 // ~(low - 1) | |
| 89 // Yields a mask that removes bits lower than the low bit value. | |
| 90 #define RC_TRACE_IN_RANGE(low, high) \ | |
| 91 (((TraceRedefineClasses & ((high << 1) - 1)) & ~(low - 1)) != 0) | |
| 92 | |
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93 // Note: The ResourceMark is to cleanup resource allocated args. |
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94 // The "do {...} while (0)" is so we can use semi-colon at end of RC_TRACE(). |
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95 #define RC_TRACE(level, args) do { \ |
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96 if (RC_TRACE_ENABLED(level)) { \ |
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97 ResourceMark rm; \ |
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98 tty->print("RedefineClasses-0x%x: ", level); \ |
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99 tty->print_cr args; \ |
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100 } \ |
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101 } while (0) |
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102 |
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103 #define RC_TRACE_NO_CR(level, args) do { \ |
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104 if (RC_TRACE_ENABLED(level)) { \ |
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105 ResourceMark rm; \ |
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106 tty->print("RedefineClasses-0x%x: ", level); \ |
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107 tty->print args; \ |
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108 } \ |
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109 } while (0) |
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110 |
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111 #define RC_TRACE_WITH_THREAD(level, thread, args) do { \ |
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112 if (RC_TRACE_ENABLED(level)) { \ |
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113 ResourceMark rm(thread); \ |
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114 tty->print("RedefineClasses-0x%x: ", level); \ |
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115 tty->print_cr args; \ |
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116 } \ |
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117 } while (0) |
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118 |
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119 #define RC_TRACE_MESG(args) do { \ |
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120 ResourceMark rm; \ |
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121 tty->print("RedefineClasses: "); \ |
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122 tty->print_cr args; \ |
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123 } while (0) |
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124 |
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125 // Timer support macros. Only do timer operations if timer tracing is enabled. |
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126 // The "do {...} while (0)" is so we can use semi-colon at end of the macro. |
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127 #define RC_TIMER_START(t) do { \ |
| 0 | 128 if (RC_TRACE_ENABLED(0x00000004)) { \ |
| 129 t.start(); \ | |
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130 } \ |
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131 } while (0) |
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132 #define RC_TIMER_STOP(t) do { \ |
| 0 | 133 if (RC_TRACE_ENABLED(0x00000004)) { \ |
| 134 t.stop(); \ | |
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135 } \ |
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136 } while (0) |
| 1972 | 137 |
| 138 #endif // SHARE_VM_PRIMS_JVMTIREDEFINECLASSESTRACE_HPP |