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This commit adds support for trace-event tracing to Node.js. It provides a mechanism to centralize tracing information generated by V8, Node core, and userspace code. It includes: - A trace writer responsible for serializing traces and cycling the output files so that no individual file becomes to large. - A buffer for aggregating traces to allow for batched flushes. - An agent which initializes the tracing controller and ensures that trace serialization is done on a separate thread. - A set of macros for generating trace events. - Tests and documentation. Author: Raymond Kang <[email protected]> Author: Kelvin Jin <[email protected]> Author: Matthew Loring <[email protected]> Author: Jason Ginchereau <[email protected]> PR-URL: #9304 Reviewed-By: Trevor Norris <[email protected]> Reviewed-By: Michael Dawson <[email protected]> Reviewed-By: Josh Gavant <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| # Tracing | ||
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| Trace Event provides a mechanism to centralize tracing information generated by | ||
| V8, Node core, and userspace code. | ||
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| Tracing can be enabled by passing the `--trace-events-enabled` flag when starting a | ||
| Node.js application. | ||
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| The set of categories for which traces are recorded can be specified using the | ||
| `--trace-event-categories` flag followed by a list of comma separated category names. | ||
| By default the `node` and `v8` categories are enabled. | ||
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| ```txt | ||
| node --trace-events-enabled --trace-event-categories v8,node server.js | ||
| ``` | ||
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| Running Node.js with tracing enabled will produce log files that can be opened | ||
| in the [`chrome://tracing`](https://www.chromium.org/developers/how-tos/trace-event-profiling-tool) | ||
| tab of Chrome. |
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| Original file line number | Diff line number | Diff line change |
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| #include "tracing/agent.h" | ||
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| #include <sstream> | ||
| #include <string> | ||
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| #include "env-inl.h" | ||
| #include "libplatform/libplatform.h" | ||
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| namespace node { | ||
| namespace tracing { | ||
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| using v8::platform::tracing::TraceConfig; | ||
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| Agent::Agent() {} | ||
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| void Agent::Start(v8::Platform* platform, const char* enabled_categories) { | ||
| platform_ = platform; | ||
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| int err = uv_loop_init(&tracing_loop_); | ||
| CHECK_EQ(err, 0); | ||
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| NodeTraceWriter* trace_writer = new NodeTraceWriter(&tracing_loop_); | ||
| TraceBuffer* trace_buffer = new NodeTraceBuffer( | ||
| NodeTraceBuffer::kBufferChunks, trace_writer, &tracing_loop_); | ||
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| tracing_controller_ = new TracingController(); | ||
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| TraceConfig* trace_config = new TraceConfig(); | ||
| if (enabled_categories) { | ||
| std::stringstream category_list(enabled_categories); | ||
| while (category_list.good()) { | ||
| std::string category; | ||
| getline(category_list, category, ','); | ||
| trace_config->AddIncludedCategory(category.c_str()); | ||
| } | ||
| } else { | ||
| trace_config->AddIncludedCategory("v8"); | ||
| trace_config->AddIncludedCategory("node"); | ||
| } | ||
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| // This thread should be created *after* async handles are created | ||
| // (within NodeTraceWriter and NodeTraceBuffer constructors). | ||
| // Otherwise the thread could shut down prematurely. | ||
| err = uv_thread_create(&thread_, ThreadCb, this); | ||
| CHECK_EQ(err, 0); | ||
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| tracing_controller_->Initialize(trace_buffer); | ||
| tracing_controller_->StartTracing(trace_config); | ||
| v8::platform::SetTracingController(platform, tracing_controller_); | ||
| } | ||
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| void Agent::Stop() { | ||
| if (!IsStarted()) { | ||
| return; | ||
| } | ||
| // Perform final Flush on TraceBuffer. We don't want the tracing controller | ||
| // to flush the buffer again on destruction of the V8::Platform. | ||
| tracing_controller_->StopTracing(); | ||
| delete tracing_controller_; | ||
| // Thread should finish when the tracing loop is stopped. | ||
| uv_thread_join(&thread_); | ||
| v8::platform::SetTracingController(platform_, nullptr); | ||
| } | ||
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| // static | ||
| void Agent::ThreadCb(void* arg) { | ||
| Agent* agent = static_cast<Agent*>(arg); | ||
| uv_run(&agent->tracing_loop_, UV_RUN_DEFAULT); | ||
| } | ||
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| } // namespace tracing | ||
| } // namespace node |
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| #ifndef SRC_TRACING_AGENT_H_ | ||
| #define SRC_TRACING_AGENT_H_ | ||
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| #include "tracing/node_trace_buffer.h" | ||
| #include "tracing/node_trace_writer.h" | ||
| #include "uv.h" | ||
| #include "v8.h" | ||
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| namespace node { | ||
| namespace tracing { | ||
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| class Agent { | ||
| public: | ||
| explicit Agent(); | ||
| void Start(v8::Platform* platform, const char* enabled_categories); | ||
| void Stop(); | ||
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| private: | ||
| bool IsStarted() { return platform_ != nullptr; } | ||
| static void ThreadCb(void* arg); | ||
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| uv_thread_t thread_; | ||
| uv_loop_t tracing_loop_; | ||
| v8::Platform* platform_ = nullptr; | ||
| TracingController* tracing_controller_; | ||
| }; | ||
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| } // namespace tracing | ||
| } // namespace node | ||
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| #endif // SRC_TRACING_AGENT_H_ |
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