Mercurial > hg > truffle
annotate src/share/vm/services/memTracker.cpp @ 21947:9f70fc90169d
Truffle: remove expensive assertion
| author | Andreas Woess <andreas.woess@oracle.com> |
|---|---|
| date | Wed, 17 Jun 2015 04:09:30 +0200 |
| parents | 417e3b8d04c5 |
| children |
| rev | line source |
|---|---|
| 6197 | 1 /* |
| 20360 | 2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved. |
| 6197 | 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. | |
| 22 * | |
| 23 */ | |
| 24 #include "precompiled.hpp" | |
| 25 | |
| 20360 | 26 #include "runtime/mutex.hpp" |
| 27 #include "services/memBaseline.hpp" | |
| 6197 | 28 #include "services/memReporter.hpp" |
| 20360 | 29 #include "services/mallocTracker.inline.hpp" |
| 6197 | 30 #include "services/memTracker.hpp" |
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31 #include "utilities/defaultStream.hpp" |
| 6197 | 32 |
| 20360 | 33 #ifdef SOLARIS |
| 34 volatile bool NMT_stack_walkable = false; | |
| 35 #else | |
| 36 volatile bool NMT_stack_walkable = true; | |
| 37 #endif | |
| 6197 | 38 |
| 20360 | 39 volatile NMT_TrackingLevel MemTracker::_tracking_level = NMT_unknown; |
| 40 NMT_TrackingLevel MemTracker::_cmdline_tracking_level = NMT_unknown; | |
| 41 | |
| 42 MemBaseline MemTracker::_baseline; | |
| 43 Mutex* MemTracker::_query_lock = NULL; | |
| 44 bool MemTracker::_is_nmt_env_valid = true; | |
| 6197 | 45 |
| 46 | |
| 20360 | 47 NMT_TrackingLevel MemTracker::init_tracking_level() { |
| 48 NMT_TrackingLevel level = NMT_off; | |
| 49 char buf[64]; | |
| 50 char nmt_option[64]; | |
| 51 jio_snprintf(buf, sizeof(buf), "NMT_LEVEL_%d", os::current_process_id()); | |
| 52 if (os::getenv(buf, nmt_option, sizeof(nmt_option))) { | |
| 53 if (strcmp(nmt_option, "summary") == 0) { | |
| 54 level = NMT_summary; | |
| 55 } else if (strcmp(nmt_option, "detail") == 0) { | |
| 11129 | 56 #if PLATFORM_NATIVE_STACK_WALKING_SUPPORTED |
| 20360 | 57 level = NMT_detail; |
| 11129 | 58 #else |
| 20360 | 59 level = NMT_summary; |
| 60 #endif // PLATFORM_NATIVE_STACK_WALKING_SUPPORTED | |
| 61 } else if (strcmp(nmt_option, "off") != 0) { | |
| 62 // The option value is invalid | |
| 63 _is_nmt_env_valid = false; | |
| 6197 | 64 } |
| 65 | |
| 20360 | 66 // Remove the environment variable to avoid leaking to child processes |
| 67 os::unsetenv(buf); | |
| 68 } | |
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69 |
| 20364 | 70 // Construct NativeCallStack::EMPTY_STACK. It may get constructed twice, |
| 71 // but it is benign, the results are the same. | |
| 72 ::new ((void*)&NativeCallStack::EMPTY_STACK) NativeCallStack(0, false); | |
| 73 | |
| 20360 | 74 if (!MallocTracker::initialize(level) || |
| 75 !VirtualMemoryTracker::initialize(level)) { | |
| 76 level = NMT_off; | |
| 6197 | 77 } |
| 20360 | 78 return level; |
| 6197 | 79 } |
| 80 | |
| 20360 | 81 void MemTracker::init() { |
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82 NMT_TrackingLevel level = tracking_level(); |
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83 if (level >= NMT_summary) { |
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84 if (!VirtualMemoryTracker::late_initialize(level)) { |
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85 shutdown(); |
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86 return; |
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87 } |
| 20360 | 88 _query_lock = new (std::nothrow) Mutex(Monitor::max_nonleaf, "NMT_queryLock"); |
| 89 // Already OOM. It is unlikely, but still have to handle it. | |
| 90 if (_query_lock == NULL) { | |
| 91 shutdown(); | |
| 6197 | 92 } |
| 93 } | |
| 94 } | |
| 95 | |
| 20360 | 96 bool MemTracker::check_launcher_nmt_support(const char* value) { |
| 97 if (strcmp(value, "=detail") == 0) { | |
| 98 #if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED | |
| 99 jio_fprintf(defaultStream::error_stream(), | |
| 100 "NMT detail is not supported on this platform. Using NMT summary instead.\n"); | |
| 101 if (MemTracker::tracking_level() != NMT_summary) { | |
| 102 return false; | |
| 103 } | |
| 104 #else | |
| 105 if (MemTracker::tracking_level() != NMT_detail) { | |
| 106 return false; | |
| 107 } | |
| 108 #endif | |
| 109 } else if (strcmp(value, "=summary") == 0) { | |
| 110 if (MemTracker::tracking_level() != NMT_summary) { | |
| 111 return false; | |
| 112 } | |
| 113 } else if (strcmp(value, "=off") == 0) { | |
| 114 if (MemTracker::tracking_level() != NMT_off) { | |
| 115 return false; | |
| 116 } | |
| 117 } else { | |
| 118 _is_nmt_env_valid = false; | |
| 119 } | |
| 120 | |
| 121 return true; | |
| 122 } | |
| 123 | |
| 124 bool MemTracker::verify_nmt_option() { | |
| 125 return _is_nmt_env_valid; | |
| 126 } | |
| 127 | |
| 128 void* MemTracker::malloc_base(void* memblock) { | |
| 129 return MallocTracker::get_base(memblock); | |
| 130 } | |
| 131 | |
| 132 void Tracker::record(address addr, size_t size) { | |
| 133 if (MemTracker::tracking_level() < NMT_summary) return; | |
| 134 switch(_type) { | |
| 135 case uncommit: | |
| 136 VirtualMemoryTracker::remove_uncommitted_region(addr, size); | |
| 137 break; | |
| 138 case release: | |
| 139 VirtualMemoryTracker::remove_released_region(addr, size); | |
| 140 break; | |
| 141 default: | |
| 142 ShouldNotReachHere(); | |
| 6197 | 143 } |
| 144 } | |
| 145 | |
| 20360 | 146 |
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147 // Shutdown can only be issued via JCmd, and NMT JCmd is serialized by lock |
| 20360 | 148 void MemTracker::shutdown() { |
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149 // We can only shutdown NMT to minimal tracking level if it is ever on. |
| 20360 | 150 if (tracking_level () > NMT_minimal) { |
| 151 transition_to(NMT_minimal); | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 bool MemTracker::transition_to(NMT_TrackingLevel level) { | |
| 156 NMT_TrackingLevel current_level = tracking_level(); | |
| 6197 | 157 |
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158 assert(level != NMT_off || current_level == NMT_off, "Cannot transition NMT to off"); |
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159 |
| 20360 | 160 if (current_level == level) { |
| 161 return true; | |
| 162 } else if (current_level > level) { | |
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163 // Downgrade tracking level, we want to lower the tracking level first |
| 20360 | 164 _tracking_level = level; |
| 165 // Make _tracking_level visible immediately. | |
| 166 OrderAccess::fence(); | |
| 167 VirtualMemoryTracker::transition(current_level, level); | |
| 168 MallocTracker::transition(current_level, level); | |
| 6197 | 169 } else { |
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170 // Upgrading tracking level is not supported and has never been supported. |
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171 // Allocating and deallocating malloc tracking structures is not thread safe and |
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172 // leads to inconsistencies unless a lot coarser locks are added. |
| 6197 | 173 } |
| 20360 | 174 return true; |
| 6197 | 175 } |
| 176 | |
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177 void MemTracker::report(bool summary_only, outputStream* output) { |
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178 assert(output != NULL, "No output stream"); |
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179 MemBaseline baseline; |
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180 if (baseline.baseline(summary_only)) { |
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181 if (summary_only) { |
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182 MemSummaryReporter rpt(baseline, output); |
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183 rpt.report(); |
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184 } else { |
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185 MemDetailReporter rpt(baseline, output); |
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186 rpt.report(); |
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187 } |
| 6197 | 188 } |
| 189 } | |
| 190 | |
| 20360 | 191 // This is a walker to gather malloc site hashtable statistics, |
| 192 // the result is used for tuning. | |
| 193 class StatisticsWalker : public MallocSiteWalker { | |
| 194 private: | |
| 195 enum Threshold { | |
| 196 // aggregates statistics over this threshold into one | |
| 197 // line item. | |
| 198 report_threshold = 20 | |
| 199 }; | |
| 6197 | 200 |
| 20360 | 201 private: |
| 202 // Number of allocation sites that have all memory freed | |
| 203 int _empty_entries; | |
| 204 // Total number of allocation sites, include empty sites | |
| 205 int _total_entries; | |
| 206 // Number of captured call stack distribution | |
| 207 int _stack_depth_distribution[NMT_TrackingStackDepth]; | |
| 208 // Hash distribution | |
| 209 int _hash_distribution[report_threshold]; | |
| 210 // Number of hash buckets that have entries over the threshold | |
| 211 int _bucket_over_threshold; | |
| 6197 | 212 |
| 20360 | 213 // The hash bucket that walker is currently walking |
| 214 int _current_hash_bucket; | |
| 215 // The length of current hash bucket | |
| 216 int _current_bucket_length; | |
| 217 // Number of hash buckets that are not empty | |
| 218 int _used_buckets; | |
| 219 // Longest hash bucket length | |
| 220 int _longest_bucket_length; | |
| 6197 | 221 |
| 20360 | 222 public: |
| 223 StatisticsWalker() : _empty_entries(0), _total_entries(0) { | |
| 224 int index = 0; | |
| 225 for (index = 0; index < NMT_TrackingStackDepth; index ++) { | |
| 226 _stack_depth_distribution[index] = 0; | |
| 6197 | 227 } |
| 20360 | 228 for (index = 0; index < report_threshold; index ++) { |
| 229 _hash_distribution[index] = 0; | |
| 230 } | |
| 231 _bucket_over_threshold = 0; | |
| 232 _longest_bucket_length = 0; | |
| 233 _current_hash_bucket = -1; | |
| 234 _current_bucket_length = 0; | |
| 235 _used_buckets = 0; | |
| 6197 | 236 } |
| 237 | |
| 20360 | 238 virtual bool at(const MallocSite* e) { |
| 239 if (e->size() == 0) _empty_entries ++; | |
| 240 _total_entries ++; | |
| 241 | |
| 242 // stack depth distrubution | |
| 243 int frames = e->call_stack()->frames(); | |
| 244 _stack_depth_distribution[frames - 1] ++; | |
| 245 | |
| 246 // hash distribution | |
| 247 int hash_bucket = e->hash() % MallocSiteTable::hash_buckets(); | |
| 248 if (_current_hash_bucket == -1) { | |
| 249 _current_hash_bucket = hash_bucket; | |
| 250 _current_bucket_length = 1; | |
| 251 } else if (_current_hash_bucket == hash_bucket) { | |
| 252 _current_bucket_length ++; | |
| 253 } else { | |
| 254 record_bucket_length(_current_bucket_length); | |
| 255 _current_hash_bucket = hash_bucket; | |
| 256 _current_bucket_length = 1; | |
| 257 } | |
| 258 return true; | |
| 6197 | 259 } |
| 260 | |
| 20360 | 261 // walk completed |
| 262 void completed() { | |
| 263 record_bucket_length(_current_bucket_length); | |
| 264 } | |
| 6197 | 265 |
| 20360 | 266 void report_statistics(outputStream* out) { |
| 267 int index; | |
| 268 out->print_cr("Malloc allocation site table:"); | |
| 269 out->print_cr("\tTotal entries: %d", _total_entries); | |
| 270 out->print_cr("\tEmpty entries: %d (%2.2f%%)", _empty_entries, ((float)_empty_entries * 100) / _total_entries); | |
| 271 out->print_cr(" "); | |
| 272 out->print_cr("Hash distribution:"); | |
| 273 if (_used_buckets < MallocSiteTable::hash_buckets()) { | |
| 274 out->print_cr("empty bucket: %d", (MallocSiteTable::hash_buckets() - _used_buckets)); | |
| 275 } | |
| 276 for (index = 0; index < report_threshold; index ++) { | |
| 277 if (_hash_distribution[index] != 0) { | |
| 278 if (index == 0) { | |
| 279 out->print_cr(" %d entry: %d", 1, _hash_distribution[0]); | |
| 280 } else if (index < 9) { // single digit | |
| 281 out->print_cr(" %d entries: %d", (index + 1), _hash_distribution[index]); | |
| 282 } else { | |
| 283 out->print_cr(" %d entries: %d", (index + 1), _hash_distribution[index]); | |
| 284 } | |
| 6197 | 285 } |
| 286 } | |
| 20360 | 287 if (_bucket_over_threshold > 0) { |
| 288 out->print_cr(" >%d entries: %d", report_threshold, _bucket_over_threshold); | |
| 289 } | |
| 290 out->print_cr("most entries: %d", _longest_bucket_length); | |
| 291 out->print_cr(" "); | |
| 292 out->print_cr("Call stack depth distribution:"); | |
| 293 for (index = 0; index < NMT_TrackingStackDepth; index ++) { | |
| 294 if (_stack_depth_distribution[index] > 0) { | |
| 295 out->print_cr("\t%d: %d", index + 1, _stack_depth_distribution[index]); | |
| 6197 | 296 } |
| 297 } | |
| 298 } | |
| 299 | |
| 20360 | 300 private: |
| 301 void record_bucket_length(int length) { | |
| 302 _used_buckets ++; | |
| 303 if (length <= report_threshold) { | |
| 304 _hash_distribution[length - 1] ++; | |
| 305 } else { | |
| 306 _bucket_over_threshold ++; | |
| 6231 | 307 } |
| 20360 | 308 _longest_bucket_length = MAX2(_longest_bucket_length, length); |
| 6197 | 309 } |
| 20360 | 310 }; |
| 6197 | 311 |
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312 |
| 20360 | 313 void MemTracker::tuning_statistics(outputStream* out) { |
| 314 // NMT statistics | |
| 315 StatisticsWalker walker; | |
| 316 MallocSiteTable::walk_malloc_site(&walker); | |
| 317 walker.completed(); | |
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318 |
| 20360 | 319 out->print_cr("Native Memory Tracking Statistics:"); |
| 320 out->print_cr("Malloc allocation site table size: %d", MallocSiteTable::hash_buckets()); | |
| 321 out->print_cr(" Tracking stack depth: %d", NMT_TrackingStackDepth); | |
| 322 NOT_PRODUCT(out->print_cr("Peak concurrent access: %d", MallocSiteTable::access_peak_count());) | |
| 323 out->print_cr(" "); | |
| 324 walker.report_statistics(out); | |
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325 } |
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326 |