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perf_hooks: make nodeTiming a first-class object #35977

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perf_hooks: make nodeTiming a first-class object #35977

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perf_hooks: make nodeTiming a first-class object
mmomtchev Nov 5, 2020
7d64d79
perf-hooks: Make nodeTiming a first-class object
mmomtchev Nov 5, 2020
170242b
perf_hooks: make nodeTiming a first-class object
mmomtchev Nov 6, 2020
166f6b3
perf_hooks: make nodeTiming a first-class object
mmomtchev Nov 6, 2020
778f60b
perf_hooks: make nodeTiming a first-class object
mmomtchev Nov 6, 2020
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103 changes: 70 additions & 33 deletions lib/perf_hooks.js
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Original file line number Diff line number Diff line change
Expand Up @@ -165,51 +165,88 @@ function getMilestoneTimestamp(milestoneIdx) {
return ns / 1e6 - timeOrigin;
}

const PerformanceNodeTimingProps = {
enumerable: true,
configurable: true
};
class PerformanceNodeTiming extends PerformanceEntry {
get name() {
return 'node';
}
constructor() {
super();

get entryType() {
return 'node';
}
ObjectDefineProperties(this, {
name: {
...PerformanceNodeTimingProps,
value: 'node'
},
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get startTime() {
return 0;
}
entryType: {
...PerformanceNodeTimingProps,
value: 'node'
},

get duration() {
return now() - timeOrigin;
}
startTime: {
...PerformanceNodeTimingProps,
value: 0
},

get nodeStart() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_NODE_START);
}
duration: {
...PerformanceNodeTimingProps,
get() {
return now() - timeOrigin;
}
},

get v8Start() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_V8_START);
}
nodeStart: {
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_NODE_START);
}
},

get environment() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_ENVIRONMENT);
}
v8Start: {
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_V8_START);
}
},

get loopStart() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_LOOP_START);
}
environment: {
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_ENVIRONMENT);
}
},

get loopExit() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_LOOP_EXIT);
}
loopStart: {
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_LOOP_START);
}
},

get bootstrapComplete() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_BOOTSTRAP_COMPLETE);
}
loopExit: {
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_LOOP_EXIT);
}
},

get idleTime() {
return loopIdleTime();
}
bootstrapComplete: {
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(
NODE_PERFORMANCE_MILESTONE_BOOTSTRAP_COMPLETE);
}
},

idleTime: {
...PerformanceNodeTimingProps,
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Non-blocking: I would just include the properties directly here (rather than use the repeated `...PerformanceNodeTimingProps) even if they're going to be duplicated just to save an unnecessary performance cost.

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Hmm, do you think V8 keeps a reference to the initializing object when using the spread operator?

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Yeah, this is ECMA specified in fact

get() {
return loopIdleTime();
}
}
});
}
[kInspect]() {
return {
name: 'node',
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7 changes: 7 additions & 0 deletions test/parallel/test-performance-eventlooputil.js
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,13 @@ if (nodeTiming.loopStart === -1) {
{ idle: 0, active: 0, utilization: 0 });
}

const nodeTimingProps = ['name', 'entryType', 'startTime', 'duration',
'nodeStart', 'v8Start', 'environment', 'loopStart',
'loopExit', 'bootstrapComplete', 'idleTime'];
for (const p of nodeTimingProps)
assert.ok(typeof JSON.parse(JSON.stringify(nodeTiming))[p] ===
typeof nodeTiming[p]);

setTimeout(mustCall(function r() {
const t = Date.now();
const elu1 = eventLoopUtilization();
Expand Down