Mercurial > hg > truffle
annotate src/share/vm/interpreter/bytecodeHistogram.cpp @ 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 | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "interpreter/bytecodeHistogram.hpp" | |
| 27 #include "memory/resourceArea.hpp" | |
| 28 #include "runtime/os.hpp" | |
| 29 #include "utilities/growableArray.hpp" | |
| 0 | 30 |
| 31 // ------------------------------------------------------------------------------------------------ | |
| 32 // Non-product code | |
| 33 #ifndef PRODUCT | |
| 34 | |
| 35 // Implementation of BytecodeCounter | |
| 36 | |
| 37 int BytecodeCounter::_counter_value = 0; | |
| 38 jlong BytecodeCounter::_reset_time = 0; | |
| 39 | |
| 40 | |
| 41 void BytecodeCounter::reset() { | |
| 42 _counter_value = 0; | |
| 43 _reset_time = os::elapsed_counter(); | |
| 44 } | |
| 45 | |
| 46 | |
| 47 double BytecodeCounter::elapsed_time() { | |
| 48 return (double)(os::elapsed_counter() - _reset_time) / (double)os::elapsed_frequency(); | |
| 49 } | |
| 50 | |
| 51 | |
| 52 double BytecodeCounter::frequency() { | |
| 53 return (double)counter_value() / elapsed_time(); | |
| 54 } | |
| 55 | |
| 56 | |
| 57 void BytecodeCounter::print() { | |
| 58 tty->print_cr( | |
| 59 "%d bytecodes executed in %.1fs (%.3fMHz)", | |
| 60 counter_value(), | |
| 61 elapsed_time(), | |
| 62 frequency() / 1000000.0 | |
| 63 ); | |
| 64 } | |
| 65 | |
| 66 | |
| 67 // Helper class for sorting | |
| 68 | |
| 69 class HistoEntry: public ResourceObj { | |
| 70 private: | |
| 71 int _index; | |
| 72 int _count; | |
| 73 | |
| 74 public: | |
| 75 HistoEntry(int index, int count) { _index = index; _count = count; } | |
| 76 int index() const { return _index; } | |
| 77 int count() const { return _count; } | |
| 78 | |
| 79 static int compare(HistoEntry** x, HistoEntry** y) { return (*x)->count() - (*y)->count(); } | |
| 80 }; | |
| 81 | |
| 82 | |
| 83 // Helper functions | |
| 84 | |
| 85 static GrowableArray<HistoEntry*>* sorted_array(int* array, int length) { | |
| 86 GrowableArray<HistoEntry*>* a = new GrowableArray<HistoEntry*>(length); | |
| 87 int i = length; | |
| 88 while (i-- > 0) a->append(new HistoEntry(i, array[i])); | |
| 89 a->sort(HistoEntry::compare); | |
| 90 return a; | |
| 91 } | |
| 92 | |
| 93 | |
| 94 static int total_count(GrowableArray<HistoEntry*>* profile) { | |
| 95 int sum = 0; | |
| 96 int i = profile->length(); | |
| 97 while (i-- > 0) sum += profile->at(i)->count(); | |
| 98 return sum; | |
| 99 } | |
| 100 | |
| 101 | |
| 102 static const char* name_for(int i) { | |
| 103 return Bytecodes::is_defined(i) ? Bytecodes::name(Bytecodes::cast(i)) : "xxxunusedxxx"; | |
| 104 } | |
| 105 | |
| 106 | |
| 107 // Implementation of BytecodeHistogram | |
| 108 | |
| 109 int BytecodeHistogram::_counters[Bytecodes::number_of_codes]; | |
| 110 | |
| 111 | |
| 112 void BytecodeHistogram::reset() { | |
| 113 int i = Bytecodes::number_of_codes; | |
| 114 while (i-- > 0) _counters[i] = 0; | |
| 115 } | |
| 116 | |
| 117 | |
| 118 void BytecodeHistogram::print(float cutoff) { | |
| 119 ResourceMark rm; | |
| 120 GrowableArray<HistoEntry*>* profile = sorted_array(_counters, Bytecodes::number_of_codes); | |
| 121 // print profile | |
| 122 int tot = total_count(profile); | |
| 123 int abs_sum = 0; | |
| 124 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789 | |
| 125 tty->print_cr("Histogram of %d executed bytecodes:", tot); | |
| 126 tty->cr(); | |
| 127 tty->print_cr(" absolute relative code name"); | |
| 128 tty->print_cr("----------------------------------------------------------------------"); | |
| 129 int i = profile->length(); | |
| 130 while (i-- > 0) { | |
| 131 HistoEntry* e = profile->at(i); | |
| 132 int abs = e->count(); | |
| 133 float rel = abs * 100.0F / tot; | |
| 134 if (cutoff <= rel) { | |
| 135 tty->print_cr("%10d %7.2f%% %02x %s", abs, rel, e->index(), name_for(e->index())); | |
| 136 abs_sum += abs; | |
| 137 } | |
| 138 } | |
| 139 tty->print_cr("----------------------------------------------------------------------"); | |
| 140 float rel_sum = abs_sum * 100.0F / tot; | |
| 141 tty->print_cr("%10d %7.2f%% (cutoff = %.2f%%)", abs_sum, rel_sum, cutoff); | |
| 142 tty->cr(); | |
| 143 } | |
| 144 | |
| 145 | |
| 146 // Implementation of BytecodePairHistogram | |
| 147 | |
| 148 int BytecodePairHistogram::_index; | |
| 149 int BytecodePairHistogram::_counters[BytecodePairHistogram::number_of_pairs]; | |
| 150 | |
| 151 | |
| 152 void BytecodePairHistogram::reset() { | |
| 153 _index = Bytecodes::_nop << log2_number_of_codes; | |
| 154 | |
| 155 int i = number_of_pairs; | |
| 156 while (i-- > 0) _counters[i] = 0; | |
| 157 } | |
| 158 | |
| 159 | |
| 160 void BytecodePairHistogram::print(float cutoff) { | |
| 161 ResourceMark rm; | |
| 162 GrowableArray<HistoEntry*>* profile = sorted_array(_counters, number_of_pairs); | |
| 163 // print profile | |
| 164 int tot = total_count(profile); | |
| 165 int abs_sum = 0; | |
| 166 tty->cr(); //0123456789012345678901234567890123456789012345678901234567890123456789 | |
| 167 tty->print_cr("Histogram of %d executed bytecode pairs:", tot); | |
| 168 tty->cr(); | |
| 169 tty->print_cr(" absolute relative codes 1st bytecode 2nd bytecode"); | |
| 170 tty->print_cr("----------------------------------------------------------------------"); | |
| 171 int i = profile->length(); | |
| 172 while (i-- > 0) { | |
| 173 HistoEntry* e = profile->at(i); | |
| 174 int abs = e->count(); | |
| 175 float rel = abs * 100.0F / tot; | |
| 176 if (cutoff <= rel) { | |
| 177 int c1 = e->index() % number_of_codes; | |
| 178 int c2 = e->index() / number_of_codes; | |
| 179 tty->print_cr("%10d %6.3f%% %02x %02x %-19s %s", abs, rel, c1, c2, name_for(c1), name_for(c2)); | |
| 180 abs_sum += abs; | |
| 181 } | |
| 182 } | |
| 183 tty->print_cr("----------------------------------------------------------------------"); | |
| 184 float rel_sum = abs_sum * 100.0F / tot; | |
| 185 tty->print_cr("%10d %6.3f%% (cutoff = %.3f%%)", abs_sum, rel_sum, cutoff); | |
| 186 tty->cr(); | |
| 187 } | |
| 188 | |
| 189 #endif |