Elliott Hughes | 2faa5f1 | 2012-01-30 14:42:07 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
jeffhao | e343b76 | 2011-12-05 16:36:44 -0800 | [diff] [blame] | 16 | |
| 17 | #include "trace.h" |
| 18 | |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 19 | #include <sys/uio.h> |
John Reck | 0624a27 | 2015-03-26 15:47:54 -0700 | [diff] [blame] | 20 | #include <unistd.h> |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 21 | |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 22 | #define ATRACE_TAG ATRACE_TAG_DALVIK |
| 23 | #include "cutils/trace.h" |
| 24 | |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 25 | #include "base/casts.h" |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 26 | #include "base/stl_util.h" |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame^] | 27 | #include "base/time_utils.h" |
Elliott Hughes | 7616005 | 2012-12-12 16:31:20 -0800 | [diff] [blame] | 28 | #include "base/unix_file/fd_file.h" |
jeffhao | e343b76 | 2011-12-05 16:36:44 -0800 | [diff] [blame] | 29 | #include "class_linker.h" |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 30 | #include "common_throws.h" |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 31 | #include "debugger.h" |
Ian Rogers | 4f6ad8a | 2013-03-18 15:27:28 -0700 | [diff] [blame] | 32 | #include "dex_file-inl.h" |
jeffhao | 725a957 | 2012-11-13 18:20:12 -0800 | [diff] [blame] | 33 | #include "instrumentation.h" |
Brian Carlstrom | ea46f95 | 2013-07-30 01:26:50 -0700 | [diff] [blame] | 34 | #include "mirror/art_method-inl.h" |
Ian Rogers | 4f6ad8a | 2013-03-18 15:27:28 -0700 | [diff] [blame] | 35 | #include "mirror/class-inl.h" |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 36 | #include "mirror/dex_cache-inl.h" |
Ian Rogers | 2dd0e2c | 2013-01-24 12:42:14 -0800 | [diff] [blame] | 37 | #include "mirror/object_array-inl.h" |
Ian Rogers | 4f6ad8a | 2013-03-18 15:27:28 -0700 | [diff] [blame] | 38 | #include "mirror/object-inl.h" |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 39 | #include "os.h" |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 40 | #include "scoped_thread_state_change.h" |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 41 | #include "ScopedLocalRef.h" |
jeffhao | e343b76 | 2011-12-05 16:36:44 -0800 | [diff] [blame] | 42 | #include "thread.h" |
Ian Rogers | 57b86d4 | 2012-03-27 16:05:41 -0700 | [diff] [blame] | 43 | #include "thread_list.h" |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame^] | 44 | #include "utils.h" |
Ian Rogers | 166db04 | 2013-07-26 12:05:57 -0700 | [diff] [blame] | 45 | #include "entrypoints/quick/quick_entrypoints.h" |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 46 | |
| 47 | namespace art { |
| 48 | |
Elliott Hughes | e119a36 | 2012-05-22 17:37:06 -0700 | [diff] [blame] | 49 | // File format: |
| 50 | // header |
| 51 | // record 0 |
| 52 | // record 1 |
| 53 | // ... |
| 54 | // |
| 55 | // Header format: |
| 56 | // u4 magic ('SLOW') |
| 57 | // u2 version |
| 58 | // u2 offset to data |
| 59 | // u8 start date/time in usec |
| 60 | // u2 record size in bytes (version >= 2 only) |
| 61 | // ... padding to 32 bytes |
| 62 | // |
| 63 | // Record format v1: |
| 64 | // u1 thread ID |
| 65 | // u4 method ID | method action |
| 66 | // u4 time delta since start, in usec |
| 67 | // |
| 68 | // Record format v2: |
| 69 | // u2 thread ID |
| 70 | // u4 method ID | method action |
| 71 | // u4 time delta since start, in usec |
| 72 | // |
| 73 | // Record format v3: |
| 74 | // u2 thread ID |
| 75 | // u4 method ID | method action |
| 76 | // u4 time delta since start, in usec |
| 77 | // u4 wall time since start, in usec (when clock == "dual" only) |
| 78 | // |
| 79 | // 32 bits of microseconds is 70 minutes. |
| 80 | // |
| 81 | // All values are stored in little-endian order. |
| 82 | |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 83 | enum TraceAction { |
Brian Carlstrom | 7934ac2 | 2013-07-26 10:54:15 -0700 | [diff] [blame] | 84 | kTraceMethodEnter = 0x00, // method entry |
| 85 | kTraceMethodExit = 0x01, // method exit |
| 86 | kTraceUnroll = 0x02, // method exited by exception unrolling |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 87 | // 0x03 currently unused |
Brian Carlstrom | 7934ac2 | 2013-07-26 10:54:15 -0700 | [diff] [blame] | 88 | kTraceMethodActionMask = 0x03, // two bits |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 89 | }; |
| 90 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 91 | static constexpr uint8_t kOpNewMethod = 1U; |
| 92 | static constexpr uint8_t kOpNewThread = 2U; |
| 93 | |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 94 | class BuildStackTraceVisitor : public StackVisitor { |
| 95 | public: |
Nicolas Geoffray | 8e5bd18 | 2015-05-06 11:34:34 +0100 | [diff] [blame] | 96 | explicit BuildStackTraceVisitor(Thread* thread) |
| 97 | : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), |
| 98 | method_trace_(Trace::AllocStackTrace()) {} |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 99 | |
Ian Rogers | ef7d42f | 2014-01-06 12:55:46 -0800 | [diff] [blame] | 100 | bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
Ian Rogers | e2f77e7 | 2013-08-13 19:19:40 -0700 | [diff] [blame] | 101 | mirror::ArtMethod* m = GetMethod(); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 102 | // Ignore runtime frames (in particular callee save). |
| 103 | if (!m->IsRuntimeMethod()) { |
| 104 | method_trace_->push_back(m); |
| 105 | } |
| 106 | return true; |
| 107 | } |
| 108 | |
| 109 | // Returns a stack trace where the topmost frame corresponds with the first element of the vector. |
Ian Rogers | e2f77e7 | 2013-08-13 19:19:40 -0700 | [diff] [blame] | 110 | std::vector<mirror::ArtMethod*>* GetStackTrace() const { |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 111 | return method_trace_; |
| 112 | } |
| 113 | |
| 114 | private: |
Ian Rogers | e2f77e7 | 2013-08-13 19:19:40 -0700 | [diff] [blame] | 115 | std::vector<mirror::ArtMethod*>* const method_trace_; |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 116 | }; |
| 117 | |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 118 | static const char kTraceTokenChar = '*'; |
| 119 | static const uint16_t kTraceHeaderLength = 32; |
| 120 | static const uint32_t kTraceMagicValue = 0x574f4c53; |
| 121 | static const uint16_t kTraceVersionSingleClock = 2; |
| 122 | static const uint16_t kTraceVersionDualClock = 3; |
Brian Carlstrom | 7934ac2 | 2013-07-26 10:54:15 -0700 | [diff] [blame] | 123 | static const uint16_t kTraceRecordSizeSingleClock = 10; // using v2 |
| 124 | static const uint16_t kTraceRecordSizeDualClock = 14; // using v3 with two timestamps |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 125 | |
Ian Rogers | e63db27 | 2014-07-15 15:36:11 -0700 | [diff] [blame] | 126 | TraceClockSource Trace::default_clock_source_ = kDefaultTraceClockSource; |
Elliott Hughes | e119a36 | 2012-05-22 17:37:06 -0700 | [diff] [blame] | 127 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 128 | Trace* volatile Trace::the_trace_ = nullptr; |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 129 | pthread_t Trace::sampling_pthread_ = 0U; |
Ian Rogers | 700a402 | 2014-05-19 16:49:03 -0700 | [diff] [blame] | 130 | std::unique_ptr<std::vector<mirror::ArtMethod*>> Trace::temp_stack_trace_; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 131 | |
Sebastien Hertz | 0462c4c | 2015-04-01 16:34:17 +0200 | [diff] [blame] | 132 | // The key identifying the tracer to update instrumentation. |
| 133 | static constexpr const char* kTracerInstrumentationKey = "Tracer"; |
| 134 | |
Brian Carlstrom | ea46f95 | 2013-07-30 01:26:50 -0700 | [diff] [blame] | 135 | static mirror::ArtMethod* DecodeTraceMethodId(uint32_t tmid) { |
| 136 | return reinterpret_cast<mirror::ArtMethod*>(tmid & ~kTraceMethodActionMask); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 137 | } |
Elliott Hughes | e119a36 | 2012-05-22 17:37:06 -0700 | [diff] [blame] | 138 | |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 139 | static TraceAction DecodeTraceAction(uint32_t tmid) { |
| 140 | return static_cast<TraceAction>(tmid & kTraceMethodActionMask); |
| 141 | } |
| 142 | |
Ian Rogers | ef7d42f | 2014-01-06 12:55:46 -0800 | [diff] [blame] | 143 | static uint32_t EncodeTraceMethodAndAction(mirror::ArtMethod* method, |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 144 | TraceAction action) { |
Ian Rogers | ef7d42f | 2014-01-06 12:55:46 -0800 | [diff] [blame] | 145 | uint32_t tmid = PointerToLowMemUInt32(method) | action; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 146 | DCHECK_EQ(method, DecodeTraceMethodId(tmid)); |
| 147 | return tmid; |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 148 | } |
| 149 | |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 150 | std::vector<mirror::ArtMethod*>* Trace::AllocStackTrace() { |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 151 | if (temp_stack_trace_.get() != nullptr) { |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 152 | return temp_stack_trace_.release(); |
| 153 | } else { |
| 154 | return new std::vector<mirror::ArtMethod*>(); |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | void Trace::FreeStackTrace(std::vector<mirror::ArtMethod*>* stack_trace) { |
| 159 | stack_trace->clear(); |
| 160 | temp_stack_trace_.reset(stack_trace); |
| 161 | } |
| 162 | |
Ian Rogers | e63db27 | 2014-07-15 15:36:11 -0700 | [diff] [blame] | 163 | void Trace::SetDefaultClockSource(TraceClockSource clock_source) { |
Elliott Hughes | 0a18df8 | 2015-01-09 15:16:16 -0800 | [diff] [blame] | 164 | #if defined(__linux__) |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 165 | default_clock_source_ = clock_source; |
| 166 | #else |
Igor Murashkin | aaebaa0 | 2015-01-26 10:55:53 -0800 | [diff] [blame] | 167 | if (clock_source != TraceClockSource::kWall) { |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 168 | LOG(WARNING) << "Ignoring tracing request to use CPU time."; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 169 | } |
| 170 | #endif |
| 171 | } |
| 172 | |
Ian Rogers | e63db27 | 2014-07-15 15:36:11 -0700 | [diff] [blame] | 173 | static uint16_t GetTraceVersion(TraceClockSource clock_source) { |
Igor Murashkin | aaebaa0 | 2015-01-26 10:55:53 -0800 | [diff] [blame] | 174 | return (clock_source == TraceClockSource::kDual) ? kTraceVersionDualClock |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 175 | : kTraceVersionSingleClock; |
| 176 | } |
| 177 | |
Ian Rogers | e63db27 | 2014-07-15 15:36:11 -0700 | [diff] [blame] | 178 | static uint16_t GetRecordSize(TraceClockSource clock_source) { |
Igor Murashkin | aaebaa0 | 2015-01-26 10:55:53 -0800 | [diff] [blame] | 179 | return (clock_source == TraceClockSource::kDual) ? kTraceRecordSizeDualClock |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 180 | : kTraceRecordSizeSingleClock; |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 181 | } |
| 182 | |
Elliott Hughes | e119a36 | 2012-05-22 17:37:06 -0700 | [diff] [blame] | 183 | bool Trace::UseThreadCpuClock() { |
Igor Murashkin | aaebaa0 | 2015-01-26 10:55:53 -0800 | [diff] [blame] | 184 | return (clock_source_ == TraceClockSource::kThreadCpu) || |
| 185 | (clock_source_ == TraceClockSource::kDual); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 186 | } |
| 187 | |
Elliott Hughes | e119a36 | 2012-05-22 17:37:06 -0700 | [diff] [blame] | 188 | bool Trace::UseWallClock() { |
Igor Murashkin | aaebaa0 | 2015-01-26 10:55:53 -0800 | [diff] [blame] | 189 | return (clock_source_ == TraceClockSource::kWall) || |
| 190 | (clock_source_ == TraceClockSource::kDual); |
Elliott Hughes | e119a36 | 2012-05-22 17:37:06 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Jeff Hao | c5d824a | 2014-07-28 18:35:38 -0700 | [diff] [blame] | 193 | void Trace::MeasureClockOverhead() { |
| 194 | if (UseThreadCpuClock()) { |
Jeff Hao | 57dac6e | 2013-08-15 16:36:24 -0700 | [diff] [blame] | 195 | Thread::Current()->GetCpuMicroTime(); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 196 | } |
Jeff Hao | c5d824a | 2014-07-28 18:35:38 -0700 | [diff] [blame] | 197 | if (UseWallClock()) { |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 198 | MicroTime(); |
| 199 | } |
| 200 | } |
| 201 | |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 202 | // Compute an average time taken to measure clocks. |
Jeff Hao | c5d824a | 2014-07-28 18:35:38 -0700 | [diff] [blame] | 203 | uint32_t Trace::GetClockOverheadNanoSeconds() { |
Jeff Hao | 57dac6e | 2013-08-15 16:36:24 -0700 | [diff] [blame] | 204 | Thread* self = Thread::Current(); |
| 205 | uint64_t start = self->GetCpuMicroTime(); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 206 | |
| 207 | for (int i = 4000; i > 0; i--) { |
Jeff Hao | c5d824a | 2014-07-28 18:35:38 -0700 | [diff] [blame] | 208 | MeasureClockOverhead(); |
| 209 | MeasureClockOverhead(); |
| 210 | MeasureClockOverhead(); |
| 211 | MeasureClockOverhead(); |
| 212 | MeasureClockOverhead(); |
| 213 | MeasureClockOverhead(); |
| 214 | MeasureClockOverhead(); |
| 215 | MeasureClockOverhead(); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 216 | } |
| 217 | |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 218 | uint64_t elapsed_us = self->GetCpuMicroTime() - start; |
| 219 | return static_cast<uint32_t>(elapsed_us / 32); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 220 | } |
| 221 | |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 222 | // TODO: put this somewhere with the big-endian equivalent used by JDWP. |
| 223 | static void Append2LE(uint8_t* buf, uint16_t val) { |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 224 | *buf++ = static_cast<uint8_t>(val); |
| 225 | *buf++ = static_cast<uint8_t>(val >> 8); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 226 | } |
| 227 | |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 228 | // TODO: put this somewhere with the big-endian equivalent used by JDWP. |
| 229 | static void Append4LE(uint8_t* buf, uint32_t val) { |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 230 | *buf++ = static_cast<uint8_t>(val); |
| 231 | *buf++ = static_cast<uint8_t>(val >> 8); |
| 232 | *buf++ = static_cast<uint8_t>(val >> 16); |
| 233 | *buf++ = static_cast<uint8_t>(val >> 24); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 234 | } |
| 235 | |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 236 | // TODO: put this somewhere with the big-endian equivalent used by JDWP. |
| 237 | static void Append8LE(uint8_t* buf, uint64_t val) { |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 238 | *buf++ = static_cast<uint8_t>(val); |
| 239 | *buf++ = static_cast<uint8_t>(val >> 8); |
| 240 | *buf++ = static_cast<uint8_t>(val >> 16); |
| 241 | *buf++ = static_cast<uint8_t>(val >> 24); |
| 242 | *buf++ = static_cast<uint8_t>(val >> 32); |
| 243 | *buf++ = static_cast<uint8_t>(val >> 40); |
| 244 | *buf++ = static_cast<uint8_t>(val >> 48); |
| 245 | *buf++ = static_cast<uint8_t>(val >> 56); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 246 | } |
| 247 | |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 248 | static void GetSample(Thread* thread, void* arg) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| 249 | BuildStackTraceVisitor build_trace_visitor(thread); |
| 250 | build_trace_visitor.WalkStack(); |
Ian Rogers | e2f77e7 | 2013-08-13 19:19:40 -0700 | [diff] [blame] | 251 | std::vector<mirror::ArtMethod*>* stack_trace = build_trace_visitor.GetStackTrace(); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 252 | Trace* the_trace = reinterpret_cast<Trace*>(arg); |
| 253 | the_trace->CompareAndUpdateStackTrace(thread, stack_trace); |
| 254 | } |
| 255 | |
Andreas Gampe | ca71458 | 2015-04-03 19:41:34 -0700 | [diff] [blame] | 256 | static void ClearThreadStackTraceAndClockBase(Thread* thread, void* arg ATTRIBUTE_UNUSED) { |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 257 | thread->SetTraceClockBase(0); |
| 258 | std::vector<mirror::ArtMethod*>* stack_trace = thread->GetStackTraceSample(); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 259 | thread->SetStackTraceSample(nullptr); |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 260 | delete stack_trace; |
| 261 | } |
| 262 | |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 263 | void Trace::CompareAndUpdateStackTrace(Thread* thread, |
Ian Rogers | e2f77e7 | 2013-08-13 19:19:40 -0700 | [diff] [blame] | 264 | std::vector<mirror::ArtMethod*>* stack_trace) { |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 265 | CHECK_EQ(pthread_self(), sampling_pthread_); |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 266 | std::vector<mirror::ArtMethod*>* old_stack_trace = thread->GetStackTraceSample(); |
| 267 | // Update the thread's stack trace sample. |
| 268 | thread->SetStackTraceSample(stack_trace); |
Jeff Hao | c1ff4b7 | 2013-08-19 11:33:10 -0700 | [diff] [blame] | 269 | // Read timer clocks to use for all events in this trace. |
| 270 | uint32_t thread_clock_diff = 0; |
| 271 | uint32_t wall_clock_diff = 0; |
| 272 | ReadClocks(thread, &thread_clock_diff, &wall_clock_diff); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 273 | if (old_stack_trace == nullptr) { |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 274 | // If there's no previous stack trace sample for this thread, log an entry event for all |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 275 | // methods in the trace. |
Ian Rogers | e2f77e7 | 2013-08-13 19:19:40 -0700 | [diff] [blame] | 276 | for (std::vector<mirror::ArtMethod*>::reverse_iterator rit = stack_trace->rbegin(); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 277 | rit != stack_trace->rend(); ++rit) { |
Jeff Hao | c1ff4b7 | 2013-08-19 11:33:10 -0700 | [diff] [blame] | 278 | LogMethodTraceEvent(thread, *rit, instrumentation::Instrumentation::kMethodEntered, |
| 279 | thread_clock_diff, wall_clock_diff); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 280 | } |
| 281 | } else { |
| 282 | // If there's a previous stack trace for this thread, diff the traces and emit entry and exit |
| 283 | // events accordingly. |
Ian Rogers | e2f77e7 | 2013-08-13 19:19:40 -0700 | [diff] [blame] | 284 | std::vector<mirror::ArtMethod*>::reverse_iterator old_rit = old_stack_trace->rbegin(); |
| 285 | std::vector<mirror::ArtMethod*>::reverse_iterator rit = stack_trace->rbegin(); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 286 | // Iterate bottom-up over both traces until there's a difference between them. |
| 287 | while (old_rit != old_stack_trace->rend() && rit != stack_trace->rend() && *old_rit == *rit) { |
| 288 | old_rit++; |
| 289 | rit++; |
| 290 | } |
| 291 | // Iterate top-down over the old trace until the point where they differ, emitting exit events. |
Ian Rogers | e2f77e7 | 2013-08-13 19:19:40 -0700 | [diff] [blame] | 292 | for (std::vector<mirror::ArtMethod*>::iterator old_it = old_stack_trace->begin(); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 293 | old_it != old_rit.base(); ++old_it) { |
Jeff Hao | c1ff4b7 | 2013-08-19 11:33:10 -0700 | [diff] [blame] | 294 | LogMethodTraceEvent(thread, *old_it, instrumentation::Instrumentation::kMethodExited, |
| 295 | thread_clock_diff, wall_clock_diff); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 296 | } |
| 297 | // Iterate bottom-up over the new trace from the point where they differ, emitting entry events. |
| 298 | for (; rit != stack_trace->rend(); ++rit) { |
Jeff Hao | c1ff4b7 | 2013-08-19 11:33:10 -0700 | [diff] [blame] | 299 | LogMethodTraceEvent(thread, *rit, instrumentation::Instrumentation::kMethodEntered, |
| 300 | thread_clock_diff, wall_clock_diff); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 301 | } |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 302 | FreeStackTrace(old_stack_trace); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 303 | } |
| 304 | } |
| 305 | |
| 306 | void* Trace::RunSamplingThread(void* arg) { |
| 307 | Runtime* runtime = Runtime::Current(); |
Ian Rogers | ef7d42f | 2014-01-06 12:55:46 -0800 | [diff] [blame] | 308 | intptr_t interval_us = reinterpret_cast<intptr_t>(arg); |
Jeff Hao | 4044bda | 2014-01-06 15:50:45 -0800 | [diff] [blame] | 309 | CHECK_GE(interval_us, 0); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 310 | CHECK(runtime->AttachCurrentThread("Sampling Profiler", true, runtime->GetSystemThreadGroup(), |
Mathieu Chartier | e5f13e5 | 2015-02-24 09:37:21 -0800 | [diff] [blame] | 311 | !runtime->IsAotCompiler())); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 312 | |
| 313 | while (true) { |
Jeff Hao | 23009dc | 2013-08-22 15:36:42 -0700 | [diff] [blame] | 314 | usleep(interval_us); |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 315 | ATRACE_BEGIN("Profile sampling"); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 316 | Thread* self = Thread::Current(); |
| 317 | Trace* the_trace; |
| 318 | { |
| 319 | MutexLock mu(self, *Locks::trace_lock_); |
| 320 | the_trace = the_trace_; |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 321 | if (the_trace == nullptr) { |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 322 | break; |
| 323 | } |
| 324 | } |
| 325 | |
Mathieu Chartier | bf9fc58 | 2015-03-13 17:21:25 -0700 | [diff] [blame] | 326 | runtime->GetThreadList()->SuspendAll(__FUNCTION__); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 327 | { |
| 328 | MutexLock mu(self, *Locks::thread_list_lock_); |
| 329 | runtime->GetThreadList()->ForEach(GetSample, the_trace); |
| 330 | } |
| 331 | runtime->GetThreadList()->ResumeAll(); |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 332 | ATRACE_END(); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 333 | } |
| 334 | |
| 335 | runtime->DetachCurrentThread(); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 336 | return nullptr; |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 339 | void Trace::Start(const char* trace_filename, int trace_fd, size_t buffer_size, int flags, |
Andreas Gampe | 7e7e0f4 | 2015-03-29 15:26:23 -0700 | [diff] [blame] | 340 | TraceOutputMode output_mode, TraceMode trace_mode, int interval_us) { |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 341 | Thread* self = Thread::Current(); |
| 342 | { |
| 343 | MutexLock mu(self, *Locks::trace_lock_); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 344 | if (the_trace_ != nullptr) { |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 345 | LOG(ERROR) << "Trace already in progress, ignoring this request"; |
| 346 | return; |
| 347 | } |
jeffhao | e343b76 | 2011-12-05 16:36:44 -0800 | [diff] [blame] | 348 | } |
Jeff Hao | d063d91 | 2014-09-08 09:38:18 -0700 | [diff] [blame] | 349 | |
| 350 | // Check interval if sampling is enabled |
Andreas Gampe | 7e7e0f4 | 2015-03-29 15:26:23 -0700 | [diff] [blame] | 351 | if (trace_mode == TraceMode::kSampling && interval_us <= 0) { |
Jeff Hao | d063d91 | 2014-09-08 09:38:18 -0700 | [diff] [blame] | 352 | LOG(ERROR) << "Invalid sampling interval: " << interval_us; |
| 353 | ScopedObjectAccess soa(self); |
| 354 | ThrowRuntimeException("Invalid sampling interval: %d", interval_us); |
| 355 | return; |
| 356 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 357 | |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 358 | // Open trace file if not going directly to ddms. |
Ian Rogers | 700a402 | 2014-05-19 16:49:03 -0700 | [diff] [blame] | 359 | std::unique_ptr<File> trace_file; |
Andreas Gampe | 7e7e0f4 | 2015-03-29 15:26:23 -0700 | [diff] [blame] | 360 | if (output_mode != TraceOutputMode::kDDMS) { |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 361 | if (trace_fd < 0) { |
Brian Carlstrom | 7571e8b | 2013-08-12 17:04:14 -0700 | [diff] [blame] | 362 | trace_file.reset(OS::CreateEmptyFile(trace_filename)); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 363 | } else { |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 364 | trace_file.reset(new File(trace_fd, "tracefile")); |
Elliott Hughes | 7616005 | 2012-12-12 16:31:20 -0800 | [diff] [blame] | 365 | trace_file->DisableAutoClose(); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 366 | } |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 367 | if (trace_file.get() == nullptr) { |
jeffhao | b5e8185 | 2012-03-12 11:15:45 -0700 | [diff] [blame] | 368 | PLOG(ERROR) << "Unable to open trace file '" << trace_filename << "'"; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 369 | ScopedObjectAccess soa(self); |
| 370 | ThrowRuntimeException("Unable to open trace file '%s'", trace_filename); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 371 | return; |
| 372 | } |
| 373 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 374 | |
Jeff Hao | d063d91 | 2014-09-08 09:38:18 -0700 | [diff] [blame] | 375 | Runtime* runtime = Runtime::Current(); |
Mathieu Chartier | 9ef78b5 | 2014-09-25 17:03:12 -0700 | [diff] [blame] | 376 | |
| 377 | // Enable count of allocs if specified in the flags. |
| 378 | bool enable_stats = false; |
| 379 | |
Mathieu Chartier | bf9fc58 | 2015-03-13 17:21:25 -0700 | [diff] [blame] | 380 | runtime->GetThreadList()->SuspendAll(__FUNCTION__); |
Jeff Hao | d063d91 | 2014-09-08 09:38:18 -0700 | [diff] [blame] | 381 | |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 382 | // Create Trace object. |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 383 | { |
| 384 | MutexLock mu(self, *Locks::trace_lock_); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 385 | if (the_trace_ != nullptr) { |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 386 | LOG(ERROR) << "Trace already in progress, ignoring this request"; |
| 387 | } else { |
Mathieu Chartier | 9ef78b5 | 2014-09-25 17:03:12 -0700 | [diff] [blame] | 388 | enable_stats = (flags && kTraceCountAllocs) != 0; |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 389 | the_trace_ = new Trace(trace_file.release(), trace_filename, buffer_size, flags, output_mode, |
| 390 | trace_mode); |
Andreas Gampe | 7e7e0f4 | 2015-03-29 15:26:23 -0700 | [diff] [blame] | 391 | if (trace_mode == TraceMode::kSampling) { |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 392 | CHECK_PTHREAD_CALL(pthread_create, (&sampling_pthread_, nullptr, &RunSamplingThread, |
Jeff Hao | 23009dc | 2013-08-22 15:36:42 -0700 | [diff] [blame] | 393 | reinterpret_cast<void*>(interval_us)), |
| 394 | "Sampling profiler thread"); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 395 | the_trace_->interval_us_ = interval_us; |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 396 | } else { |
| 397 | runtime->GetInstrumentation()->AddListener(the_trace_, |
| 398 | instrumentation::Instrumentation::kMethodEntered | |
| 399 | instrumentation::Instrumentation::kMethodExited | |
| 400 | instrumentation::Instrumentation::kMethodUnwind); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 401 | // TODO: In full-PIC mode, we don't need to fully deopt. |
Sebastien Hertz | 0462c4c | 2015-04-01 16:34:17 +0200 | [diff] [blame] | 402 | runtime->GetInstrumentation()->EnableMethodTracing(kTracerInstrumentationKey); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 403 | } |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 404 | } |
jeffhao | 0791adc | 2012-04-04 11:14:32 -0700 | [diff] [blame] | 405 | } |
Jeff Hao | d063d91 | 2014-09-08 09:38:18 -0700 | [diff] [blame] | 406 | |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 407 | runtime->GetThreadList()->ResumeAll(); |
Mathieu Chartier | 9ef78b5 | 2014-09-25 17:03:12 -0700 | [diff] [blame] | 408 | |
| 409 | // Can't call this when holding the mutator lock. |
| 410 | if (enable_stats) { |
| 411 | runtime->SetStatsEnabled(true); |
| 412 | } |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 413 | } |
| 414 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 415 | void Trace::StopTracing(bool finish_tracing, bool flush_file) { |
Mathieu Chartier | 9ef78b5 | 2014-09-25 17:03:12 -0700 | [diff] [blame] | 416 | bool stop_alloc_counting = false; |
Mathieu Chartier | 02e5f16 | 2015-03-11 09:54:22 -0700 | [diff] [blame] | 417 | Runtime* const runtime = Runtime::Current(); |
| 418 | Trace* the_trace = nullptr; |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 419 | pthread_t sampling_pthread = 0U; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 420 | { |
| 421 | MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 422 | if (the_trace_ == nullptr) { |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 423 | LOG(ERROR) << "Trace stop requested, but no trace currently running"; |
| 424 | } else { |
| 425 | the_trace = the_trace_; |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 426 | the_trace_ = nullptr; |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 427 | sampling_pthread = sampling_pthread_; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 428 | } |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 429 | } |
Mathieu Chartier | 02e5f16 | 2015-03-11 09:54:22 -0700 | [diff] [blame] | 430 | // Make sure that we join before we delete the trace since we don't want to have |
| 431 | // the sampling thread access a stale pointer. This finishes since the sampling thread exits when |
| 432 | // the_trace_ is null. |
| 433 | if (sampling_pthread != 0U) { |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 434 | CHECK_PTHREAD_CALL(pthread_join, (sampling_pthread, nullptr), "sampling thread shutdown"); |
Mathieu Chartier | 02e5f16 | 2015-03-11 09:54:22 -0700 | [diff] [blame] | 435 | sampling_pthread_ = 0U; |
| 436 | } |
Mathieu Chartier | bf9fc58 | 2015-03-13 17:21:25 -0700 | [diff] [blame] | 437 | runtime->GetThreadList()->SuspendAll(__FUNCTION__); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 438 | |
Mathieu Chartier | 02e5f16 | 2015-03-11 09:54:22 -0700 | [diff] [blame] | 439 | if (the_trace != nullptr) { |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 440 | stop_alloc_counting = (the_trace->flags_ & Trace::kTraceCountAllocs) != 0; |
| 441 | if (finish_tracing) { |
| 442 | the_trace->FinishTracing(); |
| 443 | } |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 444 | |
Andreas Gampe | 7e7e0f4 | 2015-03-29 15:26:23 -0700 | [diff] [blame] | 445 | if (the_trace->trace_mode_ == TraceMode::kSampling) { |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 446 | MutexLock mu(Thread::Current(), *Locks::thread_list_lock_); |
Mathieu Chartier | 02e5f16 | 2015-03-11 09:54:22 -0700 | [diff] [blame] | 447 | runtime->GetThreadList()->ForEach(ClearThreadStackTraceAndClockBase, nullptr); |
Jeff Hao | 5ce4b17 | 2013-08-16 16:27:18 -0700 | [diff] [blame] | 448 | } else { |
Sebastien Hertz | 0462c4c | 2015-04-01 16:34:17 +0200 | [diff] [blame] | 449 | runtime->GetInstrumentation()->DisableMethodTracing(kTracerInstrumentationKey); |
Mathieu Chartier | 02e5f16 | 2015-03-11 09:54:22 -0700 | [diff] [blame] | 450 | runtime->GetInstrumentation()->RemoveListener( |
| 451 | the_trace, instrumentation::Instrumentation::kMethodEntered | |
| 452 | instrumentation::Instrumentation::kMethodExited | |
| 453 | instrumentation::Instrumentation::kMethodUnwind); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 454 | } |
Andreas Gampe | 4303ba9 | 2014-11-06 01:00:46 -0800 | [diff] [blame] | 455 | if (the_trace->trace_file_.get() != nullptr) { |
| 456 | // Do not try to erase, so flush and close explicitly. |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 457 | if (flush_file) { |
| 458 | if (the_trace->trace_file_->Flush() != 0) { |
| 459 | PLOG(ERROR) << "Could not flush trace file."; |
| 460 | } |
| 461 | } else { |
| 462 | the_trace->trace_file_->MarkUnchecked(); // Do not trigger guard. |
Andreas Gampe | 4303ba9 | 2014-11-06 01:00:46 -0800 | [diff] [blame] | 463 | } |
| 464 | if (the_trace->trace_file_->Close() != 0) { |
| 465 | PLOG(ERROR) << "Could not close trace file."; |
| 466 | } |
| 467 | } |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 468 | delete the_trace; |
| 469 | } |
| 470 | runtime->GetThreadList()->ResumeAll(); |
Mathieu Chartier | 9ef78b5 | 2014-09-25 17:03:12 -0700 | [diff] [blame] | 471 | if (stop_alloc_counting) { |
| 472 | // Can be racy since SetStatsEnabled is not guarded by any locks. |
Mathieu Chartier | 02e5f16 | 2015-03-11 09:54:22 -0700 | [diff] [blame] | 473 | runtime->SetStatsEnabled(false); |
Jeff Hao | 0abc72e | 2013-08-13 13:45:14 -0700 | [diff] [blame] | 474 | } |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 475 | } |
| 476 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 477 | void Trace::Abort() { |
| 478 | // Do not write anything anymore. |
| 479 | StopTracing(false, false); |
| 480 | } |
| 481 | |
| 482 | void Trace::Stop() { |
| 483 | // Finish writing. |
| 484 | StopTracing(true, true); |
| 485 | } |
| 486 | |
jeffhao | b5e8185 | 2012-03-12 11:15:45 -0700 | [diff] [blame] | 487 | void Trace::Shutdown() { |
Jeff Hao | 64caa7d | 2013-08-29 11:18:01 -0700 | [diff] [blame] | 488 | if (GetMethodTracingMode() != kTracingInactive) { |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 489 | Stop(); |
jeffhao | b5e8185 | 2012-03-12 11:15:45 -0700 | [diff] [blame] | 490 | } |
jeffhao | b5e8185 | 2012-03-12 11:15:45 -0700 | [diff] [blame] | 491 | } |
| 492 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 493 | void Trace::Pause() { |
| 494 | bool stop_alloc_counting = false; |
| 495 | Runtime* runtime = Runtime::Current(); |
| 496 | Trace* the_trace = nullptr; |
| 497 | |
| 498 | pthread_t sampling_pthread = 0U; |
| 499 | { |
| 500 | MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
| 501 | if (the_trace_ == nullptr) { |
| 502 | LOG(ERROR) << "Trace pause requested, but no trace currently running"; |
| 503 | return; |
| 504 | } else { |
| 505 | the_trace = the_trace_; |
| 506 | sampling_pthread = sampling_pthread_; |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | if (sampling_pthread != 0U) { |
| 511 | { |
| 512 | MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
| 513 | the_trace_ = nullptr; |
| 514 | } |
| 515 | CHECK_PTHREAD_CALL(pthread_join, (sampling_pthread, nullptr), "sampling thread shutdown"); |
| 516 | sampling_pthread_ = 0U; |
| 517 | { |
| 518 | MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
| 519 | the_trace_ = the_trace; |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | if (the_trace != nullptr) { |
| 524 | runtime->GetThreadList()->SuspendAll(__FUNCTION__); |
| 525 | stop_alloc_counting = (the_trace->flags_ & Trace::kTraceCountAllocs) != 0; |
| 526 | |
| 527 | if (the_trace->trace_mode_ == TraceMode::kSampling) { |
| 528 | MutexLock mu(Thread::Current(), *Locks::thread_list_lock_); |
| 529 | runtime->GetThreadList()->ForEach(ClearThreadStackTraceAndClockBase, nullptr); |
| 530 | } else { |
Sebastien Hertz | 0462c4c | 2015-04-01 16:34:17 +0200 | [diff] [blame] | 531 | runtime->GetInstrumentation()->DisableMethodTracing(kTracerInstrumentationKey); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 532 | runtime->GetInstrumentation()->RemoveListener(the_trace, |
| 533 | instrumentation::Instrumentation::kMethodEntered | |
| 534 | instrumentation::Instrumentation::kMethodExited | |
| 535 | instrumentation::Instrumentation::kMethodUnwind); |
| 536 | } |
| 537 | runtime->GetThreadList()->ResumeAll(); |
| 538 | } |
| 539 | |
| 540 | if (stop_alloc_counting) { |
| 541 | // Can be racy since SetStatsEnabled is not guarded by any locks. |
| 542 | Runtime::Current()->SetStatsEnabled(false); |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | void Trace::Resume() { |
| 547 | Thread* self = Thread::Current(); |
| 548 | Trace* the_trace; |
| 549 | { |
| 550 | MutexLock mu(self, *Locks::trace_lock_); |
| 551 | if (the_trace_ == nullptr) { |
| 552 | LOG(ERROR) << "No trace to resume (or sampling mode), ignoring this request"; |
| 553 | return; |
| 554 | } |
| 555 | the_trace = the_trace_; |
| 556 | } |
| 557 | |
| 558 | Runtime* runtime = Runtime::Current(); |
| 559 | |
| 560 | // Enable count of allocs if specified in the flags. |
| 561 | bool enable_stats = (the_trace->flags_ && kTraceCountAllocs) != 0; |
| 562 | |
| 563 | runtime->GetThreadList()->SuspendAll(__FUNCTION__); |
| 564 | |
| 565 | // Reenable. |
| 566 | if (the_trace->trace_mode_ == TraceMode::kSampling) { |
| 567 | CHECK_PTHREAD_CALL(pthread_create, (&sampling_pthread_, nullptr, &RunSamplingThread, |
| 568 | reinterpret_cast<void*>(the_trace->interval_us_)), "Sampling profiler thread"); |
| 569 | } else { |
| 570 | runtime->GetInstrumentation()->AddListener(the_trace, |
| 571 | instrumentation::Instrumentation::kMethodEntered | |
| 572 | instrumentation::Instrumentation::kMethodExited | |
| 573 | instrumentation::Instrumentation::kMethodUnwind); |
| 574 | // TODO: In full-PIC mode, we don't need to fully deopt. |
Sebastien Hertz | 0462c4c | 2015-04-01 16:34:17 +0200 | [diff] [blame] | 575 | runtime->GetInstrumentation()->EnableMethodTracing(kTracerInstrumentationKey); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 576 | } |
| 577 | |
| 578 | runtime->GetThreadList()->ResumeAll(); |
| 579 | |
| 580 | // Can't call this when holding the mutator lock. |
| 581 | if (enable_stats) { |
| 582 | runtime->SetStatsEnabled(true); |
| 583 | } |
| 584 | } |
| 585 | |
Jeff Hao | 64caa7d | 2013-08-29 11:18:01 -0700 | [diff] [blame] | 586 | TracingMode Trace::GetMethodTracingMode() { |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 587 | MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 588 | if (the_trace_ == nullptr) { |
Jeff Hao | 64caa7d | 2013-08-29 11:18:01 -0700 | [diff] [blame] | 589 | return kTracingInactive; |
Jeff Hao | 64caa7d | 2013-08-29 11:18:01 -0700 | [diff] [blame] | 590 | } else { |
Andreas Gampe | 7e7e0f4 | 2015-03-29 15:26:23 -0700 | [diff] [blame] | 591 | switch (the_trace_->trace_mode_) { |
| 592 | case TraceMode::kSampling: |
| 593 | return kSampleProfilingActive; |
| 594 | case TraceMode::kMethodTracing: |
| 595 | return kMethodTracingActive; |
| 596 | } |
| 597 | LOG(FATAL) << "Unreachable"; |
| 598 | UNREACHABLE(); |
Jeff Hao | 64caa7d | 2013-08-29 11:18:01 -0700 | [diff] [blame] | 599 | } |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 600 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 601 | |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 602 | static constexpr size_t kMinBufSize = 18U; // Trace header is up to 18B. |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 603 | |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 604 | Trace::Trace(File* trace_file, const char* trace_name, size_t buffer_size, int flags, |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 605 | TraceOutputMode output_mode, TraceMode trace_mode) |
| 606 | : trace_file_(trace_file), |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 607 | buf_(new uint8_t[std::max(kMinBufSize, buffer_size)]()), |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 608 | flags_(flags), trace_output_mode_(output_mode), trace_mode_(trace_mode), |
| 609 | clock_source_(default_clock_source_), |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 610 | buffer_size_(std::max(kMinBufSize, buffer_size)), |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 611 | start_time_(MicroTime()), clock_overhead_ns_(GetClockOverheadNanoSeconds()), cur_offset_(0), |
| 612 | overflow_(false), interval_us_(0), streaming_lock_(nullptr) { |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 613 | uint16_t trace_version = GetTraceVersion(clock_source_); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 614 | if (output_mode == TraceOutputMode::kStreaming) { |
| 615 | trace_version |= 0xF0U; |
| 616 | } |
| 617 | // Set up the beginning of the trace. |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 618 | memset(buf_.get(), 0, kTraceHeaderLength); |
| 619 | Append4LE(buf_.get(), kTraceMagicValue); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 620 | Append2LE(buf_.get() + 4, trace_version); |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 621 | Append2LE(buf_.get() + 6, kTraceHeaderLength); |
| 622 | Append8LE(buf_.get() + 8, start_time_); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 623 | if (trace_version >= kTraceVersionDualClock) { |
| 624 | uint16_t record_size = GetRecordSize(clock_source_); |
| 625 | Append2LE(buf_.get() + 16, record_size); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 626 | } |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 627 | static_assert(18 <= kMinBufSize, "Minimum buffer size not large enough for trace header"); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 628 | |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 629 | // Update current offset. |
Ian Rogers | 8ab25ef | 2014-07-09 18:00:50 -0700 | [diff] [blame] | 630 | cur_offset_.StoreRelaxed(kTraceHeaderLength); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 631 | |
| 632 | if (output_mode == TraceOutputMode::kStreaming) { |
| 633 | streaming_file_name_ = trace_name; |
| 634 | streaming_lock_ = new Mutex("tracing lock"); |
| 635 | seen_threads_.reset(new ThreadIDBitSet()); |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | Trace::~Trace() { |
| 640 | delete streaming_lock_; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 641 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 642 | |
Ian Rogers | e63db27 | 2014-07-15 15:36:11 -0700 | [diff] [blame] | 643 | static void DumpBuf(uint8_t* buf, size_t buf_size, TraceClockSource clock_source) |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 644 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| 645 | uint8_t* ptr = buf + kTraceHeaderLength; |
| 646 | uint8_t* end = buf + buf_size; |
| 647 | |
| 648 | while (ptr < end) { |
| 649 | uint32_t tmid = ptr[2] | (ptr[3] << 8) | (ptr[4] << 16) | (ptr[5] << 24); |
Brian Carlstrom | ea46f95 | 2013-07-30 01:26:50 -0700 | [diff] [blame] | 650 | mirror::ArtMethod* method = DecodeTraceMethodId(tmid); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 651 | TraceAction action = DecodeTraceAction(tmid); |
| 652 | LOG(INFO) << PrettyMethod(method) << " " << static_cast<int>(action); |
| 653 | ptr += GetRecordSize(clock_source); |
| 654 | } |
jeffhao | e343b76 | 2011-12-05 16:36:44 -0800 | [diff] [blame] | 655 | } |
| 656 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 657 | static void GetVisitedMethodsFromBitSets( |
| 658 | const std::map<mirror::DexCache*, DexIndexBitSet*>& seen_methods, |
| 659 | std::set<mirror::ArtMethod*>* visited_methods) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| 660 | for (auto& e : seen_methods) { |
| 661 | DexIndexBitSet* bit_set = e.second; |
| 662 | for (uint32_t i = 0; i < bit_set->size(); ++i) { |
| 663 | if ((*bit_set)[i]) { |
| 664 | visited_methods->insert(e.first->GetResolvedMethod(i)); |
| 665 | } |
| 666 | } |
| 667 | } |
| 668 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 669 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 670 | void Trace::FinishTracing() { |
| 671 | size_t final_offset = 0; |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 672 | |
Brian Carlstrom | ea46f95 | 2013-07-30 01:26:50 -0700 | [diff] [blame] | 673 | std::set<mirror::ArtMethod*> visited_methods; |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 674 | if (trace_output_mode_ == TraceOutputMode::kStreaming) { |
| 675 | // Write the secondary file with all the method names. |
| 676 | GetVisitedMethodsFromBitSets(seen_methods_, &visited_methods); |
| 677 | |
| 678 | // Clean up. |
| 679 | for (auto& e : seen_methods_) { |
| 680 | delete e.second; |
| 681 | } |
| 682 | } else { |
| 683 | final_offset = cur_offset_.LoadRelaxed(); |
| 684 | GetVisitedMethods(final_offset, &visited_methods); |
| 685 | } |
| 686 | |
| 687 | // Compute elapsed time. |
| 688 | uint64_t elapsed = MicroTime() - start_time_; |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 689 | |
| 690 | std::ostringstream os; |
| 691 | |
| 692 | os << StringPrintf("%cversion\n", kTraceTokenChar); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 693 | os << StringPrintf("%d\n", GetTraceVersion(clock_source_)); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 694 | os << StringPrintf("data-file-overflow=%s\n", overflow_ ? "true" : "false"); |
| 695 | if (UseThreadCpuClock()) { |
| 696 | if (UseWallClock()) { |
| 697 | os << StringPrintf("clock=dual\n"); |
| 698 | } else { |
| 699 | os << StringPrintf("clock=thread-cpu\n"); |
| 700 | } |
| 701 | } else { |
| 702 | os << StringPrintf("clock=wall\n"); |
| 703 | } |
Ian Rogers | ef7d42f | 2014-01-06 12:55:46 -0800 | [diff] [blame] | 704 | os << StringPrintf("elapsed-time-usec=%" PRIu64 "\n", elapsed); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 705 | if (trace_output_mode_ != TraceOutputMode::kStreaming) { |
| 706 | size_t num_records = (final_offset - kTraceHeaderLength) / GetRecordSize(clock_source_); |
| 707 | os << StringPrintf("num-method-calls=%zd\n", num_records); |
| 708 | } |
Jeff Hao | c5d824a | 2014-07-28 18:35:38 -0700 | [diff] [blame] | 709 | os << StringPrintf("clock-call-overhead-nsec=%d\n", clock_overhead_ns_); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 710 | os << StringPrintf("vm=art\n"); |
John Reck | 0624a27 | 2015-03-26 15:47:54 -0700 | [diff] [blame] | 711 | os << StringPrintf("pid=%d\n", getpid()); |
jeffhao | 0791adc | 2012-04-04 11:14:32 -0700 | [diff] [blame] | 712 | if ((flags_ & kTraceCountAllocs) != 0) { |
| 713 | os << StringPrintf("alloc-count=%d\n", Runtime::Current()->GetStat(KIND_ALLOCATED_OBJECTS)); |
| 714 | os << StringPrintf("alloc-size=%d\n", Runtime::Current()->GetStat(KIND_ALLOCATED_BYTES)); |
| 715 | os << StringPrintf("gc-count=%d\n", Runtime::Current()->GetStat(KIND_GC_INVOCATIONS)); |
| 716 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 717 | os << StringPrintf("%cthreads\n", kTraceTokenChar); |
| 718 | DumpThreadList(os); |
| 719 | os << StringPrintf("%cmethods\n", kTraceTokenChar); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 720 | DumpMethodList(os, visited_methods); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 721 | os << StringPrintf("%cend\n", kTraceTokenChar); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 722 | std::string header(os.str()); |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 723 | |
| 724 | if (trace_output_mode_ == TraceOutputMode::kStreaming) { |
| 725 | File file; |
| 726 | if (!file.Open(streaming_file_name_ + ".sec", O_CREAT | O_WRONLY)) { |
| 727 | LOG(WARNING) << "Could not open secondary trace file!"; |
| 728 | return; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 729 | } |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 730 | if (!file.WriteFully(header.c_str(), header.length())) { |
| 731 | file.Erase(); |
Elliott Hughes | 7b9d996 | 2012-04-20 18:48:18 -0700 | [diff] [blame] | 732 | std::string detail(StringPrintf("Trace data write failed: %s", strerror(errno))); |
| 733 | PLOG(ERROR) << detail; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 734 | ThrowRuntimeException("%s", detail.c_str()); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 735 | } |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 736 | if (file.FlushCloseOrErase() != 0) { |
| 737 | PLOG(ERROR) << "Could not write secondary file"; |
| 738 | } |
| 739 | } else { |
| 740 | if (trace_file_.get() == nullptr) { |
| 741 | iovec iov[2]; |
| 742 | iov[0].iov_base = reinterpret_cast<void*>(const_cast<char*>(header.c_str())); |
| 743 | iov[0].iov_len = header.length(); |
| 744 | iov[1].iov_base = buf_.get(); |
| 745 | iov[1].iov_len = final_offset; |
| 746 | Dbg::DdmSendChunkV(CHUNK_TYPE("MPSE"), iov, 2); |
| 747 | const bool kDumpTraceInfo = false; |
| 748 | if (kDumpTraceInfo) { |
| 749 | LOG(INFO) << "Trace sent:\n" << header; |
| 750 | DumpBuf(buf_.get(), final_offset, clock_source_); |
| 751 | } |
| 752 | } else { |
| 753 | if (!trace_file_->WriteFully(header.c_str(), header.length()) || |
| 754 | !trace_file_->WriteFully(buf_.get(), final_offset)) { |
| 755 | std::string detail(StringPrintf("Trace data write failed: %s", strerror(errno))); |
| 756 | PLOG(ERROR) << detail; |
| 757 | ThrowRuntimeException("%s", detail.c_str()); |
| 758 | } |
| 759 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 760 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 761 | } |
| 762 | |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 763 | void Trace::DexPcMoved(Thread* thread, mirror::Object* this_object, |
Ian Rogers | ef7d42f | 2014-01-06 12:55:46 -0800 | [diff] [blame] | 764 | mirror::ArtMethod* method, uint32_t new_dex_pc) { |
Ian Rogers | 6a3c1fc | 2014-10-31 00:33:20 -0700 | [diff] [blame] | 765 | UNUSED(thread, this_object, method, new_dex_pc); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 766 | // We're not recorded to listen to this kind of event, so complain. |
| 767 | LOG(ERROR) << "Unexpected dex PC event in tracing " << PrettyMethod(method) << " " << new_dex_pc; |
Andreas Gampe | c8ccf68 | 2014-09-29 20:07:43 -0700 | [diff] [blame] | 768 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 769 | |
Ian Rogers | 6a3c1fc | 2014-10-31 00:33:20 -0700 | [diff] [blame] | 770 | void Trace::FieldRead(Thread* thread, mirror::Object* this_object, |
Mathieu Chartier | c785344 | 2015-03-27 14:35:38 -0700 | [diff] [blame] | 771 | mirror::ArtMethod* method, uint32_t dex_pc, ArtField* field) |
Sebastien Hertz | 3f52eaf | 2014-04-04 17:50:18 +0200 | [diff] [blame] | 772 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
Ian Rogers | 6a3c1fc | 2014-10-31 00:33:20 -0700 | [diff] [blame] | 773 | UNUSED(thread, this_object, method, dex_pc, field); |
Sebastien Hertz | 3f52eaf | 2014-04-04 17:50:18 +0200 | [diff] [blame] | 774 | // We're not recorded to listen to this kind of event, so complain. |
| 775 | LOG(ERROR) << "Unexpected field read event in tracing " << PrettyMethod(method) << " " << dex_pc; |
| 776 | } |
| 777 | |
Ian Rogers | 6a3c1fc | 2014-10-31 00:33:20 -0700 | [diff] [blame] | 778 | void Trace::FieldWritten(Thread* thread, mirror::Object* this_object, |
Mathieu Chartier | c785344 | 2015-03-27 14:35:38 -0700 | [diff] [blame] | 779 | mirror::ArtMethod* method, uint32_t dex_pc, ArtField* field, |
Sebastien Hertz | 3f52eaf | 2014-04-04 17:50:18 +0200 | [diff] [blame] | 780 | const JValue& field_value) |
| 781 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
Ian Rogers | 6a3c1fc | 2014-10-31 00:33:20 -0700 | [diff] [blame] | 782 | UNUSED(thread, this_object, method, dex_pc, field, field_value); |
Sebastien Hertz | 3f52eaf | 2014-04-04 17:50:18 +0200 | [diff] [blame] | 783 | // We're not recorded to listen to this kind of event, so complain. |
| 784 | LOG(ERROR) << "Unexpected field write event in tracing " << PrettyMethod(method) << " " << dex_pc; |
| 785 | } |
| 786 | |
Ian Rogers | 6a3c1fc | 2014-10-31 00:33:20 -0700 | [diff] [blame] | 787 | void Trace::MethodEntered(Thread* thread, mirror::Object* this_object ATTRIBUTE_UNUSED, |
| 788 | mirror::ArtMethod* method, uint32_t dex_pc ATTRIBUTE_UNUSED) { |
Jeff Hao | c1ff4b7 | 2013-08-19 11:33:10 -0700 | [diff] [blame] | 789 | uint32_t thread_clock_diff = 0; |
| 790 | uint32_t wall_clock_diff = 0; |
| 791 | ReadClocks(thread, &thread_clock_diff, &wall_clock_diff); |
| 792 | LogMethodTraceEvent(thread, method, instrumentation::Instrumentation::kMethodEntered, |
| 793 | thread_clock_diff, wall_clock_diff); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 794 | } |
| 795 | |
Ian Rogers | 6a3c1fc | 2014-10-31 00:33:20 -0700 | [diff] [blame] | 796 | void Trace::MethodExited(Thread* thread, mirror::Object* this_object ATTRIBUTE_UNUSED, |
| 797 | mirror::ArtMethod* method, uint32_t dex_pc ATTRIBUTE_UNUSED, |
| 798 | const JValue& return_value ATTRIBUTE_UNUSED) { |
Jeff Hao | c1ff4b7 | 2013-08-19 11:33:10 -0700 | [diff] [blame] | 799 | uint32_t thread_clock_diff = 0; |
| 800 | uint32_t wall_clock_diff = 0; |
| 801 | ReadClocks(thread, &thread_clock_diff, &wall_clock_diff); |
| 802 | LogMethodTraceEvent(thread, method, instrumentation::Instrumentation::kMethodExited, |
| 803 | thread_clock_diff, wall_clock_diff); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 804 | } |
| 805 | |
Ian Rogers | 6a3c1fc | 2014-10-31 00:33:20 -0700 | [diff] [blame] | 806 | void Trace::MethodUnwind(Thread* thread, mirror::Object* this_object ATTRIBUTE_UNUSED, |
| 807 | mirror::ArtMethod* method, uint32_t dex_pc ATTRIBUTE_UNUSED) { |
Jeff Hao | c1ff4b7 | 2013-08-19 11:33:10 -0700 | [diff] [blame] | 808 | uint32_t thread_clock_diff = 0; |
| 809 | uint32_t wall_clock_diff = 0; |
| 810 | ReadClocks(thread, &thread_clock_diff, &wall_clock_diff); |
| 811 | LogMethodTraceEvent(thread, method, instrumentation::Instrumentation::kMethodUnwind, |
| 812 | thread_clock_diff, wall_clock_diff); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 813 | } |
| 814 | |
Nicolas Geoffray | 14691c5 | 2015-03-05 10:40:17 +0000 | [diff] [blame] | 815 | void Trace::ExceptionCaught(Thread* thread, mirror::Throwable* exception_object) |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 816 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
Nicolas Geoffray | 14691c5 | 2015-03-05 10:40:17 +0000 | [diff] [blame] | 817 | UNUSED(thread, exception_object); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 818 | LOG(ERROR) << "Unexpected exception caught event in tracing"; |
| 819 | } |
| 820 | |
Mathieu Chartier | e5f13e5 | 2015-02-24 09:37:21 -0800 | [diff] [blame] | 821 | void Trace::BackwardBranch(Thread* /*thread*/, mirror::ArtMethod* method, |
| 822 | int32_t /*dex_pc_offset*/) |
| 823 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| 824 | LOG(ERROR) << "Unexpected backward branch event in tracing" << PrettyMethod(method); |
| 825 | } |
| 826 | |
Jeff Hao | c1ff4b7 | 2013-08-19 11:33:10 -0700 | [diff] [blame] | 827 | void Trace::ReadClocks(Thread* thread, uint32_t* thread_clock_diff, uint32_t* wall_clock_diff) { |
| 828 | if (UseThreadCpuClock()) { |
| 829 | uint64_t clock_base = thread->GetTraceClockBase(); |
| 830 | if (UNLIKELY(clock_base == 0)) { |
| 831 | // First event, record the base time in the map. |
| 832 | uint64_t time = thread->GetCpuMicroTime(); |
| 833 | thread->SetTraceClockBase(time); |
| 834 | } else { |
| 835 | *thread_clock_diff = thread->GetCpuMicroTime() - clock_base; |
| 836 | } |
| 837 | } |
| 838 | if (UseWallClock()) { |
| 839 | *wall_clock_diff = MicroTime() - start_time_; |
| 840 | } |
| 841 | } |
| 842 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 843 | bool Trace::RegisterMethod(mirror::ArtMethod* method) { |
| 844 | mirror::DexCache* dex_cache = method->GetDexCache(); |
| 845 | if (dex_cache->GetResolvedMethod(method->GetDexMethodIndex()) != method) { |
| 846 | DCHECK(dex_cache->GetResolvedMethod(method->GetDexMethodIndex()) == nullptr); |
| 847 | dex_cache->SetResolvedMethod(method->GetDexMethodIndex(), method); |
| 848 | } |
| 849 | if (seen_methods_.find(dex_cache) == seen_methods_.end()) { |
| 850 | seen_methods_.insert(std::make_pair(dex_cache, new DexIndexBitSet())); |
| 851 | } |
| 852 | DexIndexBitSet* bit_set = seen_methods_.find(dex_cache)->second; |
| 853 | if (!(*bit_set)[method->GetDexMethodIndex()]) { |
| 854 | bit_set->set(method->GetDexMethodIndex()); |
| 855 | return true; |
| 856 | } |
| 857 | return false; |
| 858 | } |
| 859 | |
| 860 | bool Trace::RegisterThread(Thread* thread) { |
| 861 | pid_t tid = thread->GetTid(); |
| 862 | CHECK_LT(0U, static_cast<uint32_t>(tid)); |
| 863 | CHECK_LT(static_cast<uint32_t>(tid), 65536U); |
| 864 | |
| 865 | if (!(*seen_threads_)[tid]) { |
| 866 | seen_threads_->set(tid); |
| 867 | return true; |
| 868 | } |
| 869 | return false; |
| 870 | } |
| 871 | |
| 872 | static std::string GetMethodLine(mirror::ArtMethod* method) |
| 873 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| 874 | return StringPrintf("%p\t%s\t%s\t%s\t%s\n", method, |
| 875 | PrettyDescriptor(method->GetDeclaringClassDescriptor()).c_str(), method->GetName(), |
| 876 | method->GetSignature().ToString().c_str(), method->GetDeclaringClassSourceFile()); |
| 877 | } |
| 878 | |
| 879 | void Trace::WriteToBuf(const uint8_t* src, size_t src_size) { |
| 880 | int32_t old_offset = cur_offset_.LoadRelaxed(); |
| 881 | int32_t new_offset = old_offset + static_cast<int32_t>(src_size); |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 882 | if (dchecked_integral_cast<size_t>(new_offset) > buffer_size_) { |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 883 | // Flush buffer. |
| 884 | if (!trace_file_->WriteFully(buf_.get(), old_offset)) { |
| 885 | PLOG(WARNING) << "Failed streaming a tracing event."; |
| 886 | } |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 887 | |
| 888 | // Check whether the data is too large for the buffer, then write immediately. |
| 889 | if (src_size >= buffer_size_) { |
| 890 | if (!trace_file_->WriteFully(src, src_size)) { |
| 891 | PLOG(WARNING) << "Failed streaming a tracing event."; |
| 892 | } |
| 893 | cur_offset_.StoreRelease(0); // Buffer is empty now. |
| 894 | return; |
| 895 | } |
| 896 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 897 | old_offset = 0; |
| 898 | new_offset = static_cast<int32_t>(src_size); |
| 899 | } |
| 900 | cur_offset_.StoreRelease(new_offset); |
| 901 | // Fill in data. |
| 902 | memcpy(buf_.get() + old_offset, src, src_size); |
| 903 | } |
| 904 | |
Ian Rogers | ef7d42f | 2014-01-06 12:55:46 -0800 | [diff] [blame] | 905 | void Trace::LogMethodTraceEvent(Thread* thread, mirror::ArtMethod* method, |
Jeff Hao | c1ff4b7 | 2013-08-19 11:33:10 -0700 | [diff] [blame] | 906 | instrumentation::Instrumentation::InstrumentationEvent event, |
| 907 | uint32_t thread_clock_diff, uint32_t wall_clock_diff) { |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 908 | // Advance cur_offset_ atomically. |
| 909 | int32_t new_offset; |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 910 | int32_t old_offset = 0; |
| 911 | |
| 912 | // We do a busy loop here trying to acquire the next offset. |
| 913 | if (trace_output_mode_ != TraceOutputMode::kStreaming) { |
| 914 | do { |
| 915 | old_offset = cur_offset_.LoadRelaxed(); |
| 916 | new_offset = old_offset + GetRecordSize(clock_source_); |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 917 | if (static_cast<size_t>(new_offset) > buffer_size_) { |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 918 | overflow_ = true; |
| 919 | return; |
| 920 | } |
| 921 | } while (!cur_offset_.CompareExchangeWeakSequentiallyConsistent(old_offset, new_offset)); |
| 922 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 923 | |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 924 | TraceAction action = kTraceMethodEnter; |
| 925 | switch (event) { |
| 926 | case instrumentation::Instrumentation::kMethodEntered: |
| 927 | action = kTraceMethodEnter; |
| 928 | break; |
| 929 | case instrumentation::Instrumentation::kMethodExited: |
| 930 | action = kTraceMethodExit; |
| 931 | break; |
| 932 | case instrumentation::Instrumentation::kMethodUnwind: |
| 933 | action = kTraceUnroll; |
| 934 | break; |
| 935 | default: |
| 936 | UNIMPLEMENTED(FATAL) << "Unexpected event: " << event; |
| 937 | } |
| 938 | |
| 939 | uint32_t method_value = EncodeTraceMethodAndAction(method, action); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 940 | |
| 941 | // Write data |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 942 | uint8_t* ptr; |
| 943 | static constexpr size_t kPacketSize = 14U; // The maximum size of data in a packet. |
| 944 | uint8_t stack_buf[kPacketSize]; // Space to store a packet when in streaming mode. |
| 945 | if (trace_output_mode_ == TraceOutputMode::kStreaming) { |
| 946 | ptr = stack_buf; |
| 947 | } else { |
| 948 | ptr = buf_.get() + old_offset; |
| 949 | } |
| 950 | |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 951 | Append2LE(ptr, thread->GetTid()); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 952 | Append4LE(ptr + 2, method_value); |
| 953 | ptr += 6; |
| 954 | |
| 955 | if (UseThreadCpuClock()) { |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 956 | Append4LE(ptr, thread_clock_diff); |
| 957 | ptr += 4; |
| 958 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 959 | if (UseWallClock()) { |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 960 | Append4LE(ptr, wall_clock_diff); |
| 961 | } |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 962 | static_assert(kPacketSize == 2 + 4 + 4 + 4, "Packet size incorrect."); |
| 963 | |
| 964 | if (trace_output_mode_ == TraceOutputMode::kStreaming) { |
| 965 | MutexLock mu(Thread::Current(), *streaming_lock_); // To serialize writing. |
| 966 | if (RegisterMethod(method)) { |
| 967 | // Write a special block with the name. |
| 968 | std::string method_line(GetMethodLine(method)); |
| 969 | uint8_t buf2[5]; |
| 970 | Append2LE(buf2, 0); |
| 971 | buf2[2] = kOpNewMethod; |
| 972 | Append2LE(buf2 + 3, static_cast<uint16_t>(method_line.length())); |
| 973 | WriteToBuf(buf2, sizeof(buf2)); |
| 974 | WriteToBuf(reinterpret_cast<const uint8_t*>(method_line.c_str()), method_line.length()); |
| 975 | } |
| 976 | if (RegisterThread(thread)) { |
| 977 | // It might be better to postpone this. Threads might not have received names... |
| 978 | std::string thread_name; |
| 979 | thread->GetThreadName(thread_name); |
| 980 | uint8_t buf2[7]; |
| 981 | Append2LE(buf2, 0); |
| 982 | buf2[2] = kOpNewThread; |
| 983 | Append2LE(buf2 + 3, static_cast<uint16_t>(thread->GetTid())); |
| 984 | Append2LE(buf2 + 5, static_cast<uint16_t>(thread_name.length())); |
| 985 | WriteToBuf(buf2, sizeof(buf2)); |
| 986 | WriteToBuf(reinterpret_cast<const uint8_t*>(thread_name.c_str()), thread_name.length()); |
| 987 | } |
| 988 | WriteToBuf(stack_buf, sizeof(stack_buf)); |
| 989 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 990 | } |
| 991 | |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 992 | void Trace::GetVisitedMethods(size_t buf_size, |
Brian Carlstrom | ea46f95 | 2013-07-30 01:26:50 -0700 | [diff] [blame] | 993 | std::set<mirror::ArtMethod*>* visited_methods) { |
jeffhao | 2692b57 | 2011-12-16 15:42:28 -0800 | [diff] [blame] | 994 | uint8_t* ptr = buf_.get() + kTraceHeaderLength; |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 995 | uint8_t* end = buf_.get() + buf_size; |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 996 | |
| 997 | while (ptr < end) { |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 998 | uint32_t tmid = ptr[2] | (ptr[3] << 8) | (ptr[4] << 16) | (ptr[5] << 24); |
Brian Carlstrom | ea46f95 | 2013-07-30 01:26:50 -0700 | [diff] [blame] | 999 | mirror::ArtMethod* method = DecodeTraceMethodId(tmid); |
Ian Rogers | 62d6c77 | 2013-02-27 08:32:07 -0800 | [diff] [blame] | 1000 | visited_methods->insert(method); |
| 1001 | ptr += GetRecordSize(clock_source_); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 1002 | } |
| 1003 | } |
| 1004 | |
Mathieu Chartier | 02e2511 | 2013-08-14 16:14:24 -0700 | [diff] [blame] | 1005 | void Trace::DumpMethodList(std::ostream& os, const std::set<mirror::ArtMethod*>& visited_methods) { |
Mathieu Chartier | 02e2511 | 2013-08-14 16:14:24 -0700 | [diff] [blame] | 1006 | for (const auto& method : visited_methods) { |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 1007 | os << GetMethodLine(method); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 1008 | } |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 1009 | } |
| 1010 | |
| 1011 | static void DumpThread(Thread* t, void* arg) { |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 1012 | std::ostream& os = *reinterpret_cast<std::ostream*>(arg); |
| 1013 | std::string name; |
| 1014 | t->GetThreadName(name); |
| 1015 | os << t->GetTid() << "\t" << name << "\n"; |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 1016 | } |
| 1017 | |
| 1018 | void Trace::DumpThreadList(std::ostream& os) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 1019 | Thread* self = Thread::Current(); |
Jeff Hao | e094b87 | 2014-10-14 13:12:01 -0700 | [diff] [blame] | 1020 | for (auto it : exited_threads_) { |
| 1021 | os << it.first << "\t" << it.second << "\n"; |
| 1022 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 1023 | Locks::thread_list_lock_->AssertNotHeld(self); |
| 1024 | MutexLock mu(self, *Locks::thread_list_lock_); |
jeffhao | a9ef3fd | 2011-12-13 18:33:43 -0800 | [diff] [blame] | 1025 | Runtime::Current()->GetThreadList()->ForEach(DumpThread, &os); |
jeffhao | e343b76 | 2011-12-05 16:36:44 -0800 | [diff] [blame] | 1026 | } |
| 1027 | |
Jeff Hao | e094b87 | 2014-10-14 13:12:01 -0700 | [diff] [blame] | 1028 | void Trace::StoreExitingThreadInfo(Thread* thread) { |
| 1029 | MutexLock mu(thread, *Locks::trace_lock_); |
| 1030 | if (the_trace_ != nullptr) { |
| 1031 | std::string name; |
| 1032 | thread->GetThreadName(name); |
Andreas Gampe | a1785c5 | 2014-11-25 20:40:08 -0800 | [diff] [blame] | 1033 | // The same thread/tid may be used multiple times. As SafeMap::Put does not allow to override |
| 1034 | // a previous mapping, use SafeMap::Overwrite. |
| 1035 | the_trace_->exited_threads_.Overwrite(thread->GetTid(), name); |
Jeff Hao | e094b87 | 2014-10-14 13:12:01 -0700 | [diff] [blame] | 1036 | } |
| 1037 | } |
| 1038 | |
Andreas Gampe | 40da286 | 2015-02-27 12:49:04 -0800 | [diff] [blame] | 1039 | Trace::TraceOutputMode Trace::GetOutputMode() { |
| 1040 | MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
| 1041 | CHECK(the_trace_ != nullptr) << "Trace output mode requested, but no trace currently running"; |
| 1042 | return the_trace_->trace_output_mode_; |
| 1043 | } |
| 1044 | |
| 1045 | Trace::TraceMode Trace::GetMode() { |
| 1046 | MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
| 1047 | CHECK(the_trace_ != nullptr) << "Trace mode requested, but no trace currently running"; |
| 1048 | return the_trace_->trace_mode_; |
| 1049 | } |
| 1050 | |
Andreas Gampe | e34a42c | 2015-04-25 14:44:29 -0700 | [diff] [blame] | 1051 | size_t Trace::GetBufferSize() { |
| 1052 | MutexLock mu(Thread::Current(), *Locks::trace_lock_); |
| 1053 | CHECK(the_trace_ != nullptr) << "Trace mode requested, but no trace currently running"; |
| 1054 | return the_trace_->buffer_size_; |
| 1055 | } |
| 1056 | |
jeffhao | e343b76 | 2011-12-05 16:36:44 -0800 | [diff] [blame] | 1057 | } // namespace art |