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perf_hooks: only enable GC tracking when it's requested #25853

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perf_hooks: only enable GC tracking when it's requested #25853

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10 changes: 9 additions & 1 deletion lib/perf_hooks.js
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,8 @@ const {
timeOrigin,
timeOriginTimestamp,
timerify,
constants
constants,
setupGarbageCollectionTracking
} = internalBinding('performance');

const {
Expand Down Expand Up @@ -273,6 +274,8 @@ class PerformanceObserverEntryList {
}
}

let gcTrackingIsEnabled = false;

class PerformanceObserver extends AsyncResource {
constructor(callback) {
if (typeof callback !== 'function') {
Expand Down Expand Up @@ -334,6 +337,11 @@ class PerformanceObserver extends AsyncResource {
if (entryTypes.length === 0) {
throw new errors.ERR_VALID_PERFORMANCE_ENTRY_TYPE();
}
if (entryTypes.includes(NODE_PERFORMANCE_ENTRY_TYPE_GC) &&
!gcTrackingIsEnabled) {
setupGarbageCollectionTracking();
gcTrackingIsEnabled = true;
}
this.disconnect();
this[kBuffer][kEntries] = [];
L.init(this[kBuffer][kEntries]);
Expand Down
8 changes: 5 additions & 3 deletions src/node_perf.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -296,8 +296,10 @@ void MarkGarbageCollectionEnd(Isolate* isolate,
entry);
}

static void SetupGarbageCollectionTracking(
const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);

inline void SetupGarbageCollectionTracking(Environment* env) {
env->isolate()->AddGCPrologueCallback(MarkGarbageCollectionStart,
static_cast<void*>(env));
env->isolate()->AddGCEpilogueCallback(MarkGarbageCollectionEnd,
Expand Down Expand Up @@ -416,6 +418,8 @@ void Initialize(Local<Object> target,
env->SetMethod(target, "markMilestone", MarkMilestone);
env->SetMethod(target, "setupObservers", SetupPerformanceObservers);
env->SetMethod(target, "timerify", Timerify);
env->SetMethod(
target, "setupGarbageCollectionTracking", SetupGarbageCollectionTracking);

Local<Object> constants = Object::New(isolate);

Expand Down Expand Up @@ -452,8 +456,6 @@ void Initialize(Local<Object> target,
env->constants_string(),
constants,
attr).ToChecked();

SetupGarbageCollectionTracking(env);
}

} // namespace performance
Expand Down