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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/trace_event/trace_event_impl.h" | |
| 6 | |
| 7 #include <fcntl.h> | |
| 8 | |
| 9 #include "base/format_macros.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "base/strings/stringprintf.h" | |
| 12 #include "base/synchronization/waitable_event.h" | |
| 13 #include "base/trace_event/trace_event.h" | |
| 14 | |
| 15 namespace base { | |
| 16 namespace trace_event { | |
| 17 | |
| 18 namespace { | |
| 19 | |
| 20 int g_atrace_fd = -1; | |
| 21 const char kATraceMarkerFile[] = "/sys/kernel/debug/tracing/trace_marker"; | |
| 22 | |
| 23 void WriteEvent( | |
| 24 char phase, | |
| 25 const char* category_group, | |
| 26 const char* name, | |
| 27 unsigned long long id, | |
| 28 const char** arg_names, | |
| 29 const unsigned char* arg_types, | |
| 30 const TraceEvent::TraceValue* arg_values, | |
| 31 const scoped_refptr<ConvertableToTraceFormat>* convertable_values, | |
| 32 unsigned int flags) { | |
| 33 std::string out = StringPrintf("%c|%d|%s", phase, getpid(), name); | |
| 34 if (flags & TRACE_EVENT_FLAG_HAS_ID) | |
| 35 StringAppendF(&out, "-%" PRIx64, static_cast<uint64>(id)); | |
| 36 out += '|'; | |
| 37 | |
| 38 for (int i = 0; i < kTraceMaxNumArgs && arg_names[i]; ++i) { | |
| 39 if (i) | |
| 40 out += ';'; | |
| 41 out += arg_names[i]; | |
| 42 out += '='; | |
| 43 std::string::size_type value_start = out.length(); | |
| 44 if (arg_types[i] == TRACE_VALUE_TYPE_CONVERTABLE) | |
| 45 convertable_values[i]->AppendAsTraceFormat(&out); | |
| 46 else | |
| 47 TraceEvent::AppendValueAsJSON(arg_types[i], arg_values[i], &out); | |
| 48 | |
| 49 // Remove the quotes which may confuse the atrace script. | |
| 50 ReplaceSubstringsAfterOffset(&out, value_start, "\\\"", "'"); | |
| 51 ReplaceSubstringsAfterOffset(&out, value_start, "\"", ""); | |
| 52 // Replace chars used for separators with similar chars in the value. | |
| 53 std::replace(out.begin() + value_start, out.end(), ';', ','); | |
| 54 std::replace(out.begin() + value_start, out.end(), '|', '!'); | |
| 55 } | |
| 56 | |
| 57 out += '|'; | |
| 58 out += category_group; | |
| 59 write(g_atrace_fd, out.c_str(), out.size()); | |
| 60 } | |
| 61 | |
| 62 void NoOpOutputCallback(WaitableEvent* complete_event, | |
| 63 const scoped_refptr<RefCountedString>&, | |
| 64 bool has_more_events) { | |
| 65 if (!has_more_events) | |
| 66 complete_event->Signal(); | |
| 67 } | |
| 68 | |
| 69 void EndChromeTracing(TraceLog* trace_log, WaitableEvent* complete_event) { | |
| 70 trace_log->SetDisabled(); | |
| 71 // Delete the buffered trace events as they have been sent to atrace. | |
| 72 trace_log->Flush(Bind(&NoOpOutputCallback, complete_event)); | |
| 73 } | |
| 74 | |
| 75 } // namespace | |
| 76 | |
| 77 // These functions support Android systrace.py when 'webview' category is | |
| 78 // traced. With the new adb_profile_chrome, we may have two phases: | |
| 79 // - before WebView is ready for combined tracing, we can use adb_profile_chrome | |
| 80 // to trace android categories other than 'webview' and chromium categories. | |
| 81 // In this way we can avoid the conflict between StartATrace/StopATrace and | |
| 82 // the intents. | |
| 83 // - TODO(wangxianzhu): after WebView is ready for combined tracing, remove | |
| 84 // StartATrace, StopATrace and SendToATrace, and perhaps send Java traces | |
| 85 // directly to atrace in trace_event_binding.cc. | |
| 86 | |
| 87 void TraceLog::StartATrace() { | |
| 88 if (g_atrace_fd != -1) | |
| 89 return; | |
| 90 | |
| 91 g_atrace_fd = open(kATraceMarkerFile, O_WRONLY); | |
| 92 if (g_atrace_fd == -1) { | |
| 93 PLOG(WARNING) << "Couldn't open " << kATraceMarkerFile; | |
| 94 return; | |
| 95 } | |
| 96 TraceConfig trace_config; | |
| 97 trace_config.SetTraceRecordMode(RECORD_CONTINUOUSLY); | |
| 98 SetEnabled(trace_config, TraceLog::RECORDING_MODE); | |
| 99 } | |
| 100 | |
| 101 void TraceLog::StopATrace() { | |
| 102 if (g_atrace_fd == -1) | |
| 103 return; | |
| 104 | |
| 105 close(g_atrace_fd); | |
| 106 g_atrace_fd = -1; | |
| 107 | |
| 108 // TraceLog::Flush() requires the current thread to have a message loop, but | |
| 109 // this thread called from Java may not have one, so flush in another thread. | |
| 110 Thread end_chrome_tracing_thread("end_chrome_tracing"); | |
| 111 WaitableEvent complete_event(false, false); | |
| 112 end_chrome_tracing_thread.Start(); | |
| 113 end_chrome_tracing_thread.task_runner()->PostTask( | |
| 114 FROM_HERE, base::Bind(&EndChromeTracing, Unretained(this), | |
| 115 Unretained(&complete_event))); | |
| 116 complete_event.Wait(); | |
| 117 } | |
| 118 | |
| 119 void TraceEvent::SendToATrace() { | |
| 120 if (g_atrace_fd == -1) | |
| 121 return; | |
| 122 | |
| 123 const char* category_group = | |
| 124 TraceLog::GetCategoryGroupName(category_group_enabled_); | |
| 125 | |
| 126 switch (phase_) { | |
| 127 case TRACE_EVENT_PHASE_BEGIN: | |
| 128 WriteEvent('B', category_group, name_, id_, | |
| 129 arg_names_, arg_types_, arg_values_, convertable_values_, | |
| 130 flags_); | |
| 131 break; | |
| 132 | |
| 133 case TRACE_EVENT_PHASE_COMPLETE: | |
| 134 WriteEvent(duration_.ToInternalValue() == -1 ? 'B' : 'E', | |
| 135 category_group, name_, id_, | |
| 136 arg_names_, arg_types_, arg_values_, convertable_values_, | |
| 137 flags_); | |
| 138 break; | |
| 139 | |
| 140 case TRACE_EVENT_PHASE_END: | |
| 141 // Though a single 'E' is enough, here append pid, name and | |
| 142 // category_group etc. So that unpaired events can be found easily. | |
| 143 WriteEvent('E', category_group, name_, id_, | |
| 144 arg_names_, arg_types_, arg_values_, convertable_values_, | |
| 145 flags_); | |
| 146 break; | |
| 147 | |
| 148 case TRACE_EVENT_PHASE_INSTANT: | |
| 149 // Simulate an instance event with a pair of begin/end events. | |
| 150 WriteEvent('B', category_group, name_, id_, | |
| 151 arg_names_, arg_types_, arg_values_, convertable_values_, | |
| 152 flags_); | |
| 153 write(g_atrace_fd, "E", 1); | |
| 154 break; | |
| 155 | |
| 156 case TRACE_EVENT_PHASE_COUNTER: | |
| 157 for (int i = 0; i < kTraceMaxNumArgs && arg_names_[i]; ++i) { | |
| 158 DCHECK(arg_types_[i] == TRACE_VALUE_TYPE_INT); | |
| 159 std::string out = base::StringPrintf( | |
| 160 "C|%d|%s-%s", getpid(), name_, arg_names_[i]); | |
| 161 if (flags_ & TRACE_EVENT_FLAG_HAS_ID) | |
| 162 StringAppendF(&out, "-%" PRIx64, static_cast<uint64>(id_)); | |
| 163 StringAppendF(&out, "|%d|%s", | |
| 164 static_cast<int>(arg_values_[i].as_int), category_group); | |
| 165 write(g_atrace_fd, out.c_str(), out.size()); | |
| 166 } | |
| 167 break; | |
| 168 | |
| 169 default: | |
| 170 // Do nothing. | |
| 171 break; | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 void TraceLog::AddClockSyncMetadataEvent() { | |
| 176 int atrace_fd = open(kATraceMarkerFile, O_WRONLY | O_APPEND); | |
| 177 if (atrace_fd == -1) { | |
| 178 PLOG(WARNING) << "Couldn't open " << kATraceMarkerFile; | |
| 179 return; | |
| 180 } | |
| 181 | |
| 182 // Android's kernel trace system has a trace_marker feature: this is a file on | |
| 183 // debugfs that takes the written data and pushes it onto the trace | |
| 184 // buffer. So, to establish clock sync, we write our monotonic clock into that | |
| 185 // trace buffer. | |
| 186 double now_in_seconds = (TraceTicks::Now() - TraceTicks()).InSecondsF(); | |
| 187 std::string marker = StringPrintf( | |
| 188 "trace_event_clock_sync: parent_ts=%f\n", now_in_seconds); | |
| 189 if (write(atrace_fd, marker.c_str(), marker.size()) == -1) | |
| 190 PLOG(WARNING) << "Couldn't write to " << kATraceMarkerFile; | |
| 191 close(atrace_fd); | |
| 192 } | |
| 193 | |
| 194 } // namespace trace_event | |
| 195 } // namespace base | |
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