perf_hooks: performance milestone time origin timestamp improvement

benchmark/perf_hooks/time-origin.js

@@ -0,0 +1,45 @@
+'use strict';
+
+const assert = require('assert');
+const common = require('../common.js');
+
+const bench = common.createBenchmark(main, {
+  n: [1e6],
+  method: ['timeOrigin', 'toJSON'],
+});
+
+function main({ method, n }) {
+  switch (method) {
+    case 'timeOrigin':
+      benchTimeOrigin(n);
+      break;
+    case 'toJSON':
+      benchToJSON(n);
+      break;
+    default:
+      throw new Error(`Unsupported method ${method}`);
+  }
+}
+
+function benchTimeOrigin(n) {
+  const arr = [];
+  for (let i = 0; i < n; ++i) {
+    arr.push(performance.timeOrigin);
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    arr[i] = performance.timeOrigin;
+  }
+  bench.end(n);
+
+  assert.strictEqual(arr.length, n);
+}
+
+function benchToJSON(n) {
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    performance.toJSON();
+  }
+  bench.end(n);
+}

lib/internal/perf/performance.js

@@ -22,7 +22,7 @@ const {
   defineEventHandler,
 } = require('internal/event_target');
 
-const { now } = require('internal/perf/utils');
+const { now, getTimeOriginTimestamp } = require('internal/perf/utils');
 
 const { markResourceTiming } = require('internal/perf/resource_timing');
 
@@ -46,10 +46,6 @@ const { inspect } = require('util');
 const { validateInternalField } = require('internal/validators');
 const { convertToInt } = require('internal/webidl');
 
-const {
-  getTimeOriginTimestamp,
-} = internalBinding('performance');
-
 const kPerformanceBrand = Symbol('performance');
 
 class Performance extends EventTarget {

lib/internal/perf/utils.js

@@ -3,6 +3,7 @@
 const {
   constants: {
     NODE_PERFORMANCE_MILESTONE_TIME_ORIGIN,
+    NODE_PERFORMANCE_MILESTONE_TIME_ORIGIN_TIMESTAMP,
   },
   milestones,
   now,
@@ -22,7 +23,12 @@ function getMilestoneTimestamp(milestoneIdx) {
   return ns / 1e6 - getTimeOrigin();
 }
 
+function getTimeOriginTimestamp() {
+  return milestones[NODE_PERFORMANCE_MILESTONE_TIME_ORIGIN_TIMESTAMP] / 1e3;
+}
+
 module.exports = {
   now,
   getMilestoneTimestamp,
+  getTimeOriginTimestamp,
 };

src/env.cc

@@ -880,7 +880,10 @@ Environment::Environment(IsolateData* isolate_data,
   destroy_async_id_list_.reserve(512);
 
   performance_state_ = std::make_unique<performance::PerformanceState>(
-      isolate, time_origin_, MAYBE_FIELD_PTR(env_info, performance_state));
+      isolate,
+      time_origin_,
+      time_origin_timestamp_,
+      MAYBE_FIELD_PTR(env_info, performance_state));
 
   if (*TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(
           TRACING_CATEGORY_NODE1(environment)) != 0) {
@@ -1837,7 +1840,7 @@ void Environment::DeserializeProperties(const EnvSerializeInfo* info) {
   immediate_info_.Deserialize(ctx);
   timeout_info_.Deserialize(ctx);
   tick_info_.Deserialize(ctx);
-  performance_state_->Deserialize(ctx, time_origin_);
+  performance_state_->Deserialize(ctx, time_origin_, time_origin_timestamp_);
   exit_info_.Deserialize(ctx);
   stream_base_state_.Deserialize(ctx);
   should_abort_on_uncaught_toggle_.Deserialize(ctx);

src/node_perf.cc

@@ -24,7 +24,6 @@ using v8::Integer;
 using v8::Isolate;
 using v8::Local;
 using v8::MaybeLocal;
-using v8::Number;
 using v8::Object;
 using v8::ObjectTemplate;
 using v8::PropertyAttribute;
@@ -43,6 +42,7 @@ uint64_t performance_v8_start;
 
 PerformanceState::PerformanceState(Isolate* isolate,
                                    uint64_t time_origin,
+                                   double time_origin_timestamp,
                                    const PerformanceState::SerializeInfo* info)
     : root(isolate,
            sizeof(performance_state_internal),
@@ -63,7 +63,7 @@ PerformanceState::PerformanceState(Isolate* isolate,
     // For deserialized performance states, we will do the
     // initialization in the deserialize callback.
     ResetMilestones();
-    Initialize(time_origin);
+    Initialize(time_origin, time_origin_timestamp);
   }
 }
 
@@ -86,23 +86,27 @@ PerformanceState::SerializeInfo PerformanceState::Serialize(
   return info;
 }
 
-void PerformanceState::Initialize(uint64_t time_origin) {
-  // We are only reusing the milestone array to store the time origin, so do
-  // not use the Mark() method. The time origin milestone is not exposed
-  // to user land.
+void PerformanceState::Initialize(uint64_t time_origin,
+                                  double time_origin_timestamp) {
+  // We are only reusing the milestone array to store the time origin
+  // and time origin timestamp, so do not use the Mark() method.
+  // The time origin milestone is not exposed to user land.
   this->milestones[NODE_PERFORMANCE_MILESTONE_TIME_ORIGIN] =
       static_cast<double>(time_origin);
+  this->milestones[NODE_PERFORMANCE_MILESTONE_TIME_ORIGIN_TIMESTAMP] =
+      time_origin_timestamp;
 }
 
 void PerformanceState::Deserialize(v8::Local<v8::Context> context,
-                                   uint64_t time_origin) {
+                                   uint64_t time_origin,
+                                   double time_origin_timestamp) {
   // Resets the pointers.
   root.Deserialize(context);
   milestones.Deserialize(context);
   observers.Deserialize(context);
 
-  // Re-initialize the time origin i.e. the process start time.
-  Initialize(time_origin);
+  // Re-initialize the time origin and timestamp i.e. the process start time.
+  Initialize(time_origin, time_origin_timestamp);
 }
 
 std::ostream& operator<<(std::ostream& o,
@@ -254,7 +258,7 @@ void Notify(const FunctionCallbackInfo<Value>& args) {
 void LoopIdleTime(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
   uint64_t idle_time = uv_metrics_idle_time(env->event_loop());
-  args.GetReturnValue().Set(1.0 * idle_time / 1e6);
+  args.GetReturnValue().Set(1.0 * idle_time / NANOS_PER_MILLIS);
 }
 
 void CreateELDHistogram(const FunctionCallbackInfo<Value>& args) {
@@ -278,12 +282,6 @@ void CreateELDHistogram(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set(histogram->object());
 }
 
-void GetTimeOriginTimeStamp(const FunctionCallbackInfo<Value>& args) {
-  Environment* env = Environment::GetCurrent(args);
-  args.GetReturnValue().Set(Number::New(
-      args.GetIsolate(), env->time_origin_timestamp() / MICROS_PER_MILLIS));
-}
-
 void MarkBootstrapComplete(const FunctionCallbackInfo<Value>& args) {
   Realm* realm = Realm::GetCurrent(args);
   CHECK_EQ(realm->kind(), Realm::Kind::kPrincipal);
@@ -324,7 +322,6 @@ static void CreatePerIsolateProperties(IsolateData* isolate_data,
             RemoveGarbageCollectionTracking);
   SetMethod(isolate, target, "notify", Notify);
   SetMethod(isolate, target, "loopIdleTime", LoopIdleTime);
-  SetMethod(isolate, target, "getTimeOriginTimestamp", GetTimeOriginTimeStamp);
   SetMethod(isolate, target, "createELDHistogram", CreateELDHistogram);
   SetMethod(isolate, target, "markBootstrapComplete", MarkBootstrapComplete);
   SetFastMethodNoSideEffect(
@@ -391,7 +388,6 @@ void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
   registry->Register(RemoveGarbageCollectionTracking);
   registry->Register(Notify);
   registry->Register(LoopIdleTime);
-  registry->Register(GetTimeOriginTimeStamp);
   registry->Register(CreateELDHistogram);
   registry->Register(MarkBootstrapComplete);
   registry->Register(SlowPerformanceNow);

src/node_perf_common.h

@@ -25,6 +25,7 @@ extern const double performance_process_start_timestamp;
 extern uint64_t performance_v8_start;
 
 #define NODE_PERFORMANCE_MILESTONES(V)                                         \
+  V(TIME_ORIGIN_TIMESTAMP, "timeOriginTimestamp")                              \
   V(TIME_ORIGIN, "timeOrigin")                                                 \
   V(ENVIRONMENT, "environment")                                                \
   V(NODE_START, "nodeStart")                                                   \
@@ -64,10 +65,13 @@ class PerformanceState {
 
   explicit PerformanceState(v8::Isolate* isolate,
                             uint64_t time_origin,
+                            double time_origin_timestamp,
                             const SerializeInfo* info);
   SerializeInfo Serialize(v8::Local<v8::Context> context,
                           v8::SnapshotCreator* creator);
-  void Deserialize(v8::Local<v8::Context> context, uint64_t time_origin);
+  void Deserialize(v8::Local<v8::Context> context,
+                   uint64_t time_origin,
+                   double time_origin_timestamp);
   friend std::ostream& operator<<(std::ostream& o, const SerializeInfo& i);
 
   AliasedUint8Array root;
@@ -81,7 +85,7 @@ class PerformanceState {
             uint64_t ts = PERFORMANCE_NOW());
 
  private:
-  void Initialize(uint64_t time_origin);
+  void Initialize(uint64_t time_origin, double time_origin_timestamp);
   void ResetMilestones();
   struct performance_state_internal {
     // doubles first so that they are always sizeof(double)-aligned