Mercurial > hg > graal-jvmci-8
annotate src/share/vm/services/memTracker.cpp @ 20363:36c9011aaead
8054368: nsk/jdi/VirtualMachine/exit/exit002 crash with detail tracking on (NMT2)
Summary: Dynamic allocate _reserved_regions instead of static object to avoid racing during process exit
Reviewed-by: dholmes, coleenp
| author | zgu |
|---|---|
| date | Thu, 14 Aug 2014 09:02:51 -0400 |
| parents | 833b0f92429a |
| children | c6211b707068 |
| 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" |
|
10355
fb14e9ed1594
8011064: Some tests have failed with SIGSEGV on arm-hflt on build b82
jprovino
parents:
10148
diff
changeset
|
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 NativeCallStack emptyStack(0, false); | |
| 43 | |
| 44 MemBaseline MemTracker::_baseline; | |
| 45 Mutex* MemTracker::_query_lock = NULL; | |
| 46 bool MemTracker::_is_nmt_env_valid = true; | |
| 6197 | 47 |
| 48 | |
| 20360 | 49 NMT_TrackingLevel MemTracker::init_tracking_level() { |
| 50 NMT_TrackingLevel level = NMT_off; | |
| 51 char buf[64]; | |
| 52 char nmt_option[64]; | |
| 53 jio_snprintf(buf, sizeof(buf), "NMT_LEVEL_%d", os::current_process_id()); | |
| 54 if (os::getenv(buf, nmt_option, sizeof(nmt_option))) { | |
| 55 if (strcmp(nmt_option, "summary") == 0) { | |
| 56 level = NMT_summary; | |
| 57 } else if (strcmp(nmt_option, "detail") == 0) { | |
| 11129 | 58 #if PLATFORM_NATIVE_STACK_WALKING_SUPPORTED |
| 20360 | 59 level = NMT_detail; |
| 11129 | 60 #else |
| 20360 | 61 level = NMT_summary; |
| 62 #endif // PLATFORM_NATIVE_STACK_WALKING_SUPPORTED | |
| 63 } else if (strcmp(nmt_option, "off") != 0) { | |
| 64 // The option value is invalid | |
| 65 _is_nmt_env_valid = false; | |
| 6197 | 66 } |
| 67 | |
| 20360 | 68 // Remove the environment variable to avoid leaking to child processes |
| 69 os::unsetenv(buf); | |
| 70 } | |
|
6232
f1f45dddb0bd
7181986: NMT ON: Assertion failure when running jdi ExpiredRequestDeletionTest
zgu
parents:
6197
diff
changeset
|
71 |
| 20360 | 72 if (!MallocTracker::initialize(level) || |
| 73 !VirtualMemoryTracker::initialize(level)) { | |
| 74 level = NMT_off; | |
| 6197 | 75 } |
| 20360 | 76 return level; |
| 6197 | 77 } |
| 78 | |
| 20360 | 79 void MemTracker::init() { |
|
20363
36c9011aaead
8054368: nsk/jdi/VirtualMachine/exit/exit002 crash with detail tracking on (NMT2)
zgu
parents:
20360
diff
changeset
|
80 NMT_TrackingLevel level = tracking_level(); |
|
36c9011aaead
8054368: nsk/jdi/VirtualMachine/exit/exit002 crash with detail tracking on (NMT2)
zgu
parents:
20360
diff
changeset
|
81 if (level >= NMT_summary) { |
|
36c9011aaead
8054368: nsk/jdi/VirtualMachine/exit/exit002 crash with detail tracking on (NMT2)
zgu
parents:
20360
diff
changeset
|
82 if (!VirtualMemoryTracker::late_initialize(level)) { |
|
36c9011aaead
8054368: nsk/jdi/VirtualMachine/exit/exit002 crash with detail tracking on (NMT2)
zgu
parents:
20360
diff
changeset
|
83 shutdown(); |
|
36c9011aaead
8054368: nsk/jdi/VirtualMachine/exit/exit002 crash with detail tracking on (NMT2)
zgu
parents:
20360
diff
changeset
|
84 return; |
|
36c9011aaead
8054368: nsk/jdi/VirtualMachine/exit/exit002 crash with detail tracking on (NMT2)
zgu
parents:
20360
diff
changeset
|
85 } |
| 20360 | 86 _query_lock = new (std::nothrow) Mutex(Monitor::max_nonleaf, "NMT_queryLock"); |
| 87 // Already OOM. It is unlikely, but still have to handle it. | |
| 88 if (_query_lock == NULL) { | |
| 89 shutdown(); | |
| 6197 | 90 } |
| 91 } | |
| 92 } | |
| 93 | |
| 20360 | 94 bool MemTracker::check_launcher_nmt_support(const char* value) { |
| 95 if (strcmp(value, "=detail") == 0) { | |
| 96 #if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED | |
| 97 jio_fprintf(defaultStream::error_stream(), | |
| 98 "NMT detail is not supported on this platform. Using NMT summary instead.\n"); | |
| 99 if (MemTracker::tracking_level() != NMT_summary) { | |
| 100 return false; | |
| 101 } | |
| 102 #else | |
| 103 if (MemTracker::tracking_level() != NMT_detail) { | |
| 104 return false; | |
| 105 } | |
| 106 #endif | |
| 107 } else if (strcmp(value, "=summary") == 0) { | |
| 108 if (MemTracker::tracking_level() != NMT_summary) { | |
| 109 return false; | |
| 110 } | |
| 111 } else if (strcmp(value, "=off") == 0) { | |
| 112 if (MemTracker::tracking_level() != NMT_off) { | |
| 113 return false; | |
| 114 } | |
| 115 } else { | |
| 116 _is_nmt_env_valid = false; | |
| 117 } | |
| 118 | |
| 119 return true; | |
| 120 } | |
| 121 | |
| 122 bool MemTracker::verify_nmt_option() { | |
| 123 return _is_nmt_env_valid; | |
| 124 } | |
| 125 | |
| 126 void* MemTracker::malloc_base(void* memblock) { | |
| 127 return MallocTracker::get_base(memblock); | |
| 128 } | |
| 129 | |
| 130 void Tracker::record(address addr, size_t size) { | |
| 131 if (MemTracker::tracking_level() < NMT_summary) return; | |
| 132 switch(_type) { | |
| 133 case uncommit: | |
| 134 VirtualMemoryTracker::remove_uncommitted_region(addr, size); | |
| 135 break; | |
| 136 case release: | |
| 137 VirtualMemoryTracker::remove_released_region(addr, size); | |
| 138 break; | |
| 139 default: | |
| 140 ShouldNotReachHere(); | |
| 6197 | 141 } |
| 142 } | |
| 143 | |
| 20360 | 144 |
| 145 // Shutdown can only be issued via JCmd, and NMT JCmd is serialized | |
| 146 // by lock | |
| 147 void MemTracker::shutdown() { | |
| 148 // We can only shutdown NMT to minimal tracking level if it is | |
| 149 // ever on. | |
| 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 |
| 20360 | 158 if (current_level == level) { |
| 159 return true; | |
| 160 } else if (current_level > level) { | |
| 161 // Downgrade tracking level, we want to lower the tracking | |
| 162 // level first | |
| 163 _tracking_level = level; | |
| 164 // Make _tracking_level visible immediately. | |
| 165 OrderAccess::fence(); | |
| 166 VirtualMemoryTracker::transition(current_level, level); | |
| 167 MallocTracker::transition(current_level, level); | |
| 168 | |
| 169 if (level == NMT_minimal) _baseline.reset(); | |
| 6197 | 170 } else { |
| 20360 | 171 VirtualMemoryTracker::transition(current_level, level); |
| 172 MallocTracker::transition(current_level, level); | |
| 6197 | 173 |
| 20360 | 174 _tracking_level = level; |
| 175 // Make _tracking_level visible immediately. | |
| 176 OrderAccess::fence(); | |
| 6197 | 177 } |
| 178 | |
| 20360 | 179 return true; |
| 6197 | 180 } |
| 181 | |
| 20360 | 182 void MemTracker::final_report(outputStream* output) { |
| 183 assert(output != NULL, "No output stream"); | |
| 184 if (tracking_level() >= NMT_summary) { | |
| 185 MallocMemorySnapshot* malloc_memory_snapshot = | |
| 186 MallocMemorySummary::as_snapshot(); | |
| 187 malloc_memory_snapshot->make_adjustment(); | |
| 188 | |
| 189 VirtualMemorySnapshot* virtual_memory_snapshot = | |
| 190 VirtualMemorySummary::as_snapshot(); | |
| 191 | |
| 192 MemSummaryReporter rptr(malloc_memory_snapshot, | |
| 193 virtual_memory_snapshot, output); | |
| 194 rptr.report(); | |
| 195 // shutdown NMT, the data no longer accurate | |
| 196 shutdown(); | |
| 6197 | 197 } |
| 198 } | |
| 199 | |
| 20360 | 200 // This is a walker to gather malloc site hashtable statistics, |
| 201 // the result is used for tuning. | |
| 202 class StatisticsWalker : public MallocSiteWalker { | |
| 203 private: | |
| 204 enum Threshold { | |
| 205 // aggregates statistics over this threshold into one | |
| 206 // line item. | |
| 207 report_threshold = 20 | |
| 208 }; | |
| 6197 | 209 |
| 20360 | 210 private: |
| 211 // Number of allocation sites that have all memory freed | |
| 212 int _empty_entries; | |
| 213 // Total number of allocation sites, include empty sites | |
| 214 int _total_entries; | |
| 215 // Number of captured call stack distribution | |
| 216 int _stack_depth_distribution[NMT_TrackingStackDepth]; | |
| 217 // Hash distribution | |
| 218 int _hash_distribution[report_threshold]; | |
| 219 // Number of hash buckets that have entries over the threshold | |
| 220 int _bucket_over_threshold; | |
| 6197 | 221 |
| 20360 | 222 // The hash bucket that walker is currently walking |
| 223 int _current_hash_bucket; | |
| 224 // The length of current hash bucket | |
| 225 int _current_bucket_length; | |
| 226 // Number of hash buckets that are not empty | |
| 227 int _used_buckets; | |
| 228 // Longest hash bucket length | |
| 229 int _longest_bucket_length; | |
| 6197 | 230 |
| 20360 | 231 public: |
| 232 StatisticsWalker() : _empty_entries(0), _total_entries(0) { | |
| 233 int index = 0; | |
| 234 for (index = 0; index < NMT_TrackingStackDepth; index ++) { | |
| 235 _stack_depth_distribution[index] = 0; | |
| 6197 | 236 } |
| 20360 | 237 for (index = 0; index < report_threshold; index ++) { |
| 238 _hash_distribution[index] = 0; | |
| 239 } | |
| 240 _bucket_over_threshold = 0; | |
| 241 _longest_bucket_length = 0; | |
| 242 _current_hash_bucket = -1; | |
| 243 _current_bucket_length = 0; | |
| 244 _used_buckets = 0; | |
| 6197 | 245 } |
| 246 | |
| 20360 | 247 virtual bool at(const MallocSite* e) { |
| 248 if (e->size() == 0) _empty_entries ++; | |
| 249 _total_entries ++; | |
| 250 | |
| 251 // stack depth distrubution | |
| 252 int frames = e->call_stack()->frames(); | |
| 253 _stack_depth_distribution[frames - 1] ++; | |
| 254 | |
| 255 // hash distribution | |
| 256 int hash_bucket = e->hash() % MallocSiteTable::hash_buckets(); | |
| 257 if (_current_hash_bucket == -1) { | |
| 258 _current_hash_bucket = hash_bucket; | |
| 259 _current_bucket_length = 1; | |
| 260 } else if (_current_hash_bucket == hash_bucket) { | |
| 261 _current_bucket_length ++; | |
| 262 } else { | |
| 263 record_bucket_length(_current_bucket_length); | |
| 264 _current_hash_bucket = hash_bucket; | |
| 265 _current_bucket_length = 1; | |
| 266 } | |
| 267 return true; | |
| 6197 | 268 } |
| 269 | |
| 20360 | 270 // walk completed |
| 271 void completed() { | |
| 272 record_bucket_length(_current_bucket_length); | |
| 273 } | |
| 6197 | 274 |
| 20360 | 275 void report_statistics(outputStream* out) { |
| 276 int index; | |
| 277 out->print_cr("Malloc allocation site table:"); | |
| 278 out->print_cr("\tTotal entries: %d", _total_entries); | |
| 279 out->print_cr("\tEmpty entries: %d (%2.2f%%)", _empty_entries, ((float)_empty_entries * 100) / _total_entries); | |
| 280 out->print_cr(" "); | |
| 281 out->print_cr("Hash distribution:"); | |
| 282 if (_used_buckets < MallocSiteTable::hash_buckets()) { | |
| 283 out->print_cr("empty bucket: %d", (MallocSiteTable::hash_buckets() - _used_buckets)); | |
| 284 } | |
| 285 for (index = 0; index < report_threshold; index ++) { | |
| 286 if (_hash_distribution[index] != 0) { | |
| 287 if (index == 0) { | |
| 288 out->print_cr(" %d entry: %d", 1, _hash_distribution[0]); | |
| 289 } else if (index < 9) { // single digit | |
| 290 out->print_cr(" %d entries: %d", (index + 1), _hash_distribution[index]); | |
| 291 } else { | |
| 292 out->print_cr(" %d entries: %d", (index + 1), _hash_distribution[index]); | |
| 293 } | |
| 6197 | 294 } |
| 295 } | |
| 20360 | 296 if (_bucket_over_threshold > 0) { |
| 297 out->print_cr(" >%d entries: %d", report_threshold, _bucket_over_threshold); | |
| 298 } | |
| 299 out->print_cr("most entries: %d", _longest_bucket_length); | |
| 300 out->print_cr(" "); | |
| 301 out->print_cr("Call stack depth distribution:"); | |
| 302 for (index = 0; index < NMT_TrackingStackDepth; index ++) { | |
| 303 if (_stack_depth_distribution[index] > 0) { | |
| 304 out->print_cr("\t%d: %d", index + 1, _stack_depth_distribution[index]); | |
| 6197 | 305 } |
| 306 } | |
| 307 } | |
| 308 | |
| 20360 | 309 private: |
| 310 void record_bucket_length(int length) { | |
| 311 _used_buckets ++; | |
| 312 if (length <= report_threshold) { | |
| 313 _hash_distribution[length - 1] ++; | |
| 314 } else { | |
| 315 _bucket_over_threshold ++; | |
| 6231 | 316 } |
| 20360 | 317 _longest_bucket_length = MAX2(_longest_bucket_length, length); |
| 6197 | 318 } |
| 20360 | 319 }; |
| 6197 | 320 |
|
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
321 |
| 20360 | 322 void MemTracker::tuning_statistics(outputStream* out) { |
| 323 // NMT statistics | |
| 324 StatisticsWalker walker; | |
| 325 MallocSiteTable::walk_malloc_site(&walker); | |
| 326 walker.completed(); | |
|
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
327 |
| 20360 | 328 out->print_cr("Native Memory Tracking Statistics:"); |
| 329 out->print_cr("Malloc allocation site table size: %d", MallocSiteTable::hash_buckets()); | |
| 330 out->print_cr(" Tracking stack depth: %d", NMT_TrackingStackDepth); | |
| 331 NOT_PRODUCT(out->print_cr("Peak concurrent access: %d", MallocSiteTable::access_peak_count());) | |
| 332 out->print_cr(" "); | |
| 333 walker.report_statistics(out); | |
|
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
334 } |
|
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
zgu
parents:
10355
diff
changeset
|
335 |