3 files changed, 370 insertions, 0 deletions
diff --git a/tools/performance/PerfStats.cpp b/tools/performance/PerfStats.cpp
new file mode 100644
index 0000000000..f390dabe42
--- /dev/null
+++ b/tools/performance/PerfStats.cpp
@@ -0,0 +1,262 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PerfStats.h"
+#include "nsAppRunner.h"
+#include "mozilla/dom/BrowserParent.h"
+#include "mozilla/dom/CanonicalBrowsingContext.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/ContentProcessManager.h"
+#include "mozilla/dom/WindowGlobalParent.h"
+#include "mozilla/gfx/GPUChild.h"
+#include "mozilla/gfx/GPUProcessManager.h"
+#include "mozilla/JSONWriter.h"
+
+using namespace mozilla::dom;
+using namespace mozilla::gfx;
+
+namespace mozilla {
+
+static const char* const sMetricNames[] = {"DisplayList Building",
+                                           "Rasterizing",
+                                           "LayerBuilding",
+                                           "Layer Transactions",
+                                           "Compositing",
+                                           "Reflowing",
+                                           "Styling"};
+
+PerfStats::MetricMask PerfStats::sCollectionMask = 0;
+StaticMutex PerfStats::sMutex;
+StaticAutoPtr<PerfStats> PerfStats::sSingleton;
+
+void PerfStats::SetCollectionMask(MetricMask aMask) {
+  sCollectionMask = aMask;
+  for (uint64_t i = 0; i < static_cast<uint64_t>(Metric::Max); i++) {
+    if (!(sCollectionMask & 1 << i)) {
+      continue;
+    }
+
+    GetSingleton()->mRecordedTimes[i] = 0;
+  }
+
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+
+  GPUProcessManager* gpuManager = GPUProcessManager::Get();
+  GPUChild* gpuChild = nullptr;
+
+  if (gpuManager) {
+    gpuChild = gpuManager->GetGPUChild();
+    if (gpuChild) {
+      gpuChild->SendUpdatePerfStatsCollectionMask(aMask);
+    }
+  }
+
+  nsTArray<ContentParent*> contentParents;
+  ContentParent::GetAll(contentParents);
+
+  for (ContentParent* parent : contentParents) {
+    Unused << parent->SendUpdatePerfStatsCollectionMask(aMask);
+  }
+}
+
+PerfStats* PerfStats::GetSingleton() {
+  if (!sSingleton) {
+    sSingleton = new PerfStats;
+  }
+
+  return sSingleton.get();
+}
+
+void PerfStats::RecordMeasurementStartInternal(Metric aMetric) {
+  StaticMutexAutoLock lock(sMutex);
+
+  GetSingleton()->mRecordedStarts[static_cast<size_t>(aMetric)] =
+      TimeStamp::Now();
+}
+
+void PerfStats::RecordMeasurementEndInternal(Metric aMetric) {
+  StaticMutexAutoLock lock(sMutex);
+
+  MOZ_ASSERT(sSingleton);
+
+  sSingleton->mRecordedTimes[static_cast<size_t>(aMetric)] +=
+      (TimeStamp::Now() -
+       sSingleton->mRecordedStarts[static_cast<size_t>(aMetric)])
+          .ToMilliseconds();
+}
+
+struct StringWriteFunc : public JSONWriteFunc {
+  nsCString& mString;
+
+  explicit StringWriteFunc(nsCString& aString) : mString(aString) {}
+  virtual void Write(const Span<const char>& aStr) override {
+    mString.Append(aStr);
+  }
+};
+
+void AppendJSONStringAsProperty(nsCString& aDest, const char* aPropertyName,
+                                const nsCString& aJSON) {
+  // We need to manually append into the string here, since JSONWriter has no
+  // way to allow us to write an existing JSON object into a property.
+  aDest.Append(",\n\"");
+  aDest.Append(aPropertyName);
+  aDest.Append("\": ");
+  aDest.Append(aJSON);
+}
+
+struct PerfStatsCollector {
+  PerfStatsCollector() : writer(MakeUnique<StringWriteFunc>(string)) {}
+
+  void AppendPerfStats(const nsCString& aString, ContentParent* aParent) {
+    writer.StartObjectElement();
+    writer.StringProperty("type", "content");
+    writer.IntProperty("id", aParent->ChildID());
+    const ManagedContainer<PBrowserParent>& browsers =
+        aParent->ManagedPBrowserParent();
+
+    writer.StartArrayProperty("urls");
+    for (auto iter = browsers.ConstIter(); !iter.Done(); iter.Next()) {
+      RefPtr<BrowserParent> parent =
+          BrowserParent::GetFrom(iter.Get()->GetKey());
+
+      CanonicalBrowsingContext* ctx = parent->GetBrowsingContext();
+      if (!ctx) {
+        continue;
+      }
+
+      WindowGlobalParent* windowGlobal = ctx->GetCurrentWindowGlobal();
+      if (!windowGlobal) {
+        continue;
+      }
+
+      RefPtr<nsIURI> uri = windowGlobal->GetDocumentURI();
+      if (!uri) {
+        continue;
+      }
+
+      nsAutoCString url;
+      uri->GetSpec(url);
+
+      writer.StringElement(url);
+    }
+    writer.EndArray();
+    AppendJSONStringAsProperty(string, "perfstats", aString);
+    writer.EndObject();
+  }
+
+  void AppendPerfStats(const nsCString& aString, GPUChild* aChild) {
+    writer.StartObjectElement();
+    writer.StringProperty("type", "gpu");
+    writer.IntProperty("id", aChild->Id());
+    AppendJSONStringAsProperty(string, "perfstats", aString);
+    writer.EndObject();
+  }
+
+  ~PerfStatsCollector() {
+    writer.EndArray();
+    writer.End();
+    promise.Resolve(string, __func__);
+  }
+  nsCString string;
+  JSONWriter writer;
+  MozPromiseHolder<PerfStats::PerfStatsPromise> promise;
+};
+
+auto PerfStats::CollectPerfStatsJSONInternal() -> RefPtr<PerfStatsPromise> {
+  if (!PerfStats::sCollectionMask) {
+    return PerfStatsPromise::CreateAndReject(false, __func__);
+  }
+
+  if (!XRE_IsParentProcess()) {
+    return PerfStatsPromise::CreateAndResolve(
+        CollectLocalPerfStatsJSONInternal(), __func__);
+  }
+
+  std::shared_ptr<PerfStatsCollector> collector =
+      std::make_shared<PerfStatsCollector>();
+
+  JSONWriter& w = collector->writer;
+
+  w.Start();
+  {
+    w.StartArrayProperty("processes");
+    {
+      w.StartObjectElement();
+      {
+        w.StringProperty("type", "parent");
+        AppendJSONStringAsProperty(collector->string, "perfstats",
+                                   CollectLocalPerfStatsJSONInternal());
+      }
+      w.EndObject();
+
+      GPUProcessManager* gpuManager = GPUProcessManager::Get();
+      GPUChild* gpuChild = nullptr;
+
+      if (gpuManager) {
+        gpuChild = gpuManager->GetGPUChild();
+      }
+      nsTArray<ContentParent*> contentParents;
+      ContentParent::GetAll(contentParents);
+
+      if (gpuChild) {
+        gpuChild->SendCollectPerfStatsJSON(
+            [collector, gpuChild](const nsCString& aString) {
+              collector->AppendPerfStats(aString, gpuChild);
+            },
+            // The only feasible errors here are if something goes wrong in the
+            // the bridge, we choose to ignore those.
+            [](mozilla::ipc::ResponseRejectReason) {});
+      }
+      for (ContentParent* parent : contentParents) {
+        RefPtr<ContentParent> parentRef = parent;
+        parent->SendCollectPerfStatsJSON(
+            [collector, parentRef](const nsCString& aString) {
+              collector->AppendPerfStats(aString, parentRef.get());
+            },
+            // The only feasible errors here are if something goes wrong in the
+            // the bridge, we choose to ignore those.
+            [](mozilla::ipc::ResponseRejectReason) {});
+      }
+    }
+  }
+
+  return collector->promise.Ensure(__func__);
+}
+
+nsCString PerfStats::CollectLocalPerfStatsJSONInternal() {
+  StaticMutexAutoLock lock(PerfStats::sMutex);
+
+  nsCString jsonString;
+
+  JSONWriter w(MakeUnique<StringWriteFunc>(jsonString));
+  w.Start();
+  {
+    w.StartArrayProperty("metrics");
+    {
+      for (uint64_t i = 0; i < static_cast<uint64_t>(Metric::Max); i++) {
+        if (!(sCollectionMask & (1 << i))) {
+          continue;
+        }
+
+        w.StartObjectElement();
+        {
+          w.IntProperty("id", i);
+          w.StringProperty("metric", MakeStringSpan(sMetricNames[i]));
+          w.DoubleProperty("time", mRecordedTimes[i]);
+        }
+        w.EndObject();
+      }
+    }
+    w.EndArray();
+  }
+  w.End();
+
+  return jsonString;
+}
+
+}  // namespace mozilla
diff --git a/tools/performance/PerfStats.h b/tools/performance/PerfStats.h
new file mode 100644
index 0000000000..68ebfc3a57
--- /dev/null
+++ b/tools/performance/PerfStats.h
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef PerfStats_h
+#define PerfStats_h
+
+#include "mozilla/TimeStamp.h"
+#include "mozilla/StaticMutex.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/MozPromise.h"
+#include <memory>
+#include <string>
+#include <limits>
+
+namespace mozilla {
+
+class PerfStats {
+ public:
+  typedef MozPromise<nsCString, bool, true> PerfStatsPromise;
+
+  enum class Metric : uint32_t {
+    DisplayListBuilding = 0,
+    Rasterizing,
+    LayerBuilding,
+    LayerTransactions,
+    Compositing,
+    Reflowing,
+    Styling,
+    Max
+  };
+
+  // MetricMask is a bitmask based on 'Metric', i.e. Metric::LayerBuilding (2)
+  // is synonymous to 1 << 2 in MetricMask.
+  using MetricMask = uint64_t;
+
+  static void RecordMeasurementStart(Metric aMetric) {
+    if (!(sCollectionMask & (1 << static_cast<uint64_t>(aMetric)))) {
+      return;
+    }
+    RecordMeasurementStartInternal(aMetric);
+  }
+
+  static void RecordMeasurementEnd(Metric aMetric) {
+    if (!(sCollectionMask & (1 << static_cast<uint64_t>(aMetric)))) {
+      return;
+    }
+    RecordMeasurementEndInternal(aMetric);
+  }
+
+  template <Metric N>
+  class AutoMetricRecording {
+   public:
+    AutoMetricRecording() { PerfStats::RecordMeasurementStart(N); }
+    ~AutoMetricRecording() { PerfStats::RecordMeasurementEnd(N); }
+  };
+
+  static void SetCollectionMask(MetricMask aMask);
+
+  static RefPtr<PerfStatsPromise> CollectPerfStatsJSON() {
+    return GetSingleton()->CollectPerfStatsJSONInternal();
+  }
+
+  static nsCString CollectLocalPerfStatsJSON() {
+    return GetSingleton()->CollectLocalPerfStatsJSONInternal();
+  }
+
+ private:
+  static PerfStats* GetSingleton();
+  static void RecordMeasurementStartInternal(Metric aMetric);
+  static void RecordMeasurementEndInternal(Metric aMetric);
+
+  RefPtr<PerfStatsPromise> CollectPerfStatsJSONInternal();
+  nsCString CollectLocalPerfStatsJSONInternal();
+
+  static MetricMask sCollectionMask;
+  static StaticMutex sMutex;
+  static StaticAutoPtr<PerfStats> sSingleton;
+  TimeStamp mRecordedStarts[static_cast<size_t>(Metric::Max)];
+  double mRecordedTimes[static_cast<size_t>(Metric::Max)];
+};
+
+static_assert(1 << (static_cast<uint64_t>(PerfStats::Metric::Max) - 1) <=
+                  std::numeric_limits<PerfStats::MetricMask>::max(),
+              "More metrics than can fit into sCollectionMask bitmask");
+
+}  // namespace mozilla
+
+#endif  // PerfStats_h
diff --git a/tools/performance/moz.build b/tools/performance/moz.build
new file mode 100644
index 0000000000..ea82c83126
--- /dev/null
+++ b/tools/performance/moz.build
@@ -0,0 +1,17 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+UNIFIED_SOURCES += [
+    "PerfStats.cpp",
+]
+
+EXPORTS.mozilla += [
+    "PerfStats.h",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul"