mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Benoit Girard
30087a6e00
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/44840 Changelog: [Internal] Introduce a simplified and minimal tracing backend for Fusebox. This backend is sufficient to implement a pretty usable performance panel. Although the more I see how easy this is and how annoying working with Perfetto is, the more I think we should just maintain this going forward. Anyways we can figure that out incrementally. For now the plan is still for this to be temporary. Reviewed By: motiz88 Differential Revision: D57981944 fbshipit-source-id: b3d8c6e8c5a18311bbe98254f8ddf3810fa1334b
103 lines
2.6 KiB
C++
103 lines
2.6 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <mutex>
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#include <unordered_map>
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#include "FuseboxTracer.h"
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namespace facebook::react {
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bool FuseboxTracer::isTracing() {
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std::lock_guard lock(mutex_);
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return tracing_;
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}
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bool FuseboxTracer::startTracing() {
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std::lock_guard lock(mutex_);
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if (tracing_) {
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return false;
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}
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tracing_ = true;
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return true;
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}
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bool FuseboxTracer::stopTracing(
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const std::function<void(const folly::dynamic& eventsChunk)>&
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resultCallback) {
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std::lock_guard lock(mutex_);
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if (!tracing_) {
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return false;
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}
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tracing_ = false;
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if (buffer_.empty()) {
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return true;
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}
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auto traceEvents = folly::dynamic::array();
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auto savedBuffer = std::move(buffer_);
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buffer_.clear();
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std::unordered_map<std::string, uint64_t> trackIdMap;
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uint64_t nextTrack = 1000;
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// Name the main process. Only one process is supported currently.
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traceEvents.push_back(folly::dynamic::object(
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"args", folly::dynamic::object("name", "Main App"))("cat", "__metadata")(
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"name", "process_name")("ph", "M")("pid", 1000)("tid", 0)("ts", 0));
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for (auto& event : savedBuffer) {
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if (!trackIdMap.contains(event.track)) {
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auto trackId = nextTrack++;
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trackIdMap[event.track] = trackId;
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// New track
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traceEvents.push_back(folly::dynamic::object(
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"args", folly::dynamic::object("name", event.track))(
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"cat", "__metadata")("name", "thread_name")("ph", "M")("pid", 1000)(
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"tid", trackId)("ts", 0));
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}
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auto trackId = trackIdMap[event.track];
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// New event
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traceEvents.push_back(folly::dynamic::object(
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"args", folly::dynamic::object())("cat", "react.native")(
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"dur", (event.end - event.start) * 1000)("name", event.name)("ph", "X")(
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"ts", event.start * 1000)("pid", 1000)("tid", trackId));
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if (traceEvents.size() >= 1000) {
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resultCallback(traceEvents);
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traceEvents = folly::dynamic::array();
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}
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}
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if (traceEvents.size() >= 1) {
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resultCallback(traceEvents);
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}
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return true;
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}
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void FuseboxTracer::addEvent(
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const std::string& name,
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uint64_t start,
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uint64_t end,
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const std::string& track) {
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std::lock_guard<std::mutex> lock(mutex_);
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if (!tracing_) {
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return;
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}
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buffer_.push_back(BufferEvent{start, end, name, track});
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}
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/* static */ FuseboxTracer& FuseboxTracer::getFuseboxTracer() {
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static FuseboxTracer tracer;
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return tracer;
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}
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} // namespace facebook::react
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