worker: optimize cpu profile implement

Author: theanarkh

doc/api/v8.md

@@ -1398,6 +1398,33 @@ setTimeout(() => {
 }, 1000);
 ```
 
+## Class: `CPUProfileHandle`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+### `cpuProfileHandle.stop()`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+* Returns: {Promise}
+
+Stopping collecting the profile, then return a Promise that fulfills with an error or the
+profile data.
+
+### `cpuProfileHandle[Symbol.asyncDispose]()`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+* Returns: {Promise}
+
+Stopping collecting the profile and the profile will be discarded.
+
 ## `v8.isStringOneByteRepresentation(content)`
 
 <!-- YAML

doc/api/worker_threads.md

@@ -1958,19 +1958,16 @@ this matches its values.
 
 If the worker has stopped, the return value is an empty object.
 
-### `worker.startCpuProfile(name)`
+### `worker.startCpuProfile()`
 
 <!-- YAML
 added: REPLACEME
 -->
 
-* name: {string}
 * Returns: {Promise}
 
-Starting a CPU profile with the given `name`, then return a Promise that fulfills
-with an error or an object which has a `stop` method. Calling the `stop` method will
-stop collecting the profile, then return a Promise that fulfills with an error or the
-profile data.
+Starting a CPU profile then return a Promise that fulfills with an error
+or an `CPUProfileHandle` object. This API supports `await using` syntax.
 
 ```cjs
 const { Worker } = require('node:worker_threads');
@@ -1981,13 +1978,29 @@ const worker = new Worker(`
   `, { eval: true });
 
 worker.on('online', async () => {
-  const handle = await worker.startCpuProfile('demo');
+  const handle = await worker.startCpuProfile();
   const profile = await handle.stop();
   console.log(profile);
   worker.terminate();
 });
 ```
 
+`await using` example.
+
+```cjs
+const { Worker } = require('node::worker_threads');
+
+const w = new Worker(`
+  const { parentPort } = require('worker_threads');
+  parentPort.on('message', () => {});
+  `, { eval: true });
+
+w.on('online', async () => {
+  // Stop profile automatically when return and profile will be discarded
+  await using handle = await w.startCpuProfile();
+});
+```
+
 ### `worker.stderr`
 
 <!-- YAML

lib/internal/worker.js

@@ -134,6 +134,37 @@ function assignEnvironmentData(data) {
   });
 }
 
+class CPUProfileHandle {
+  #worker = null;
+  #id = null;
+  #promise = null;
+
+  constructor(worker, id) {
+    this.#worker = worker;
+    this.#id = id;
+  }
+
+  stop() {
+    if (this.#promise) {
+      return this.#promise;
+    }
+    const stopTaker = this.#worker[kHandle]?.stopCpuProfile(this.#id);
+    return this.#promise = new Promise((resolve, reject) => {
+      if (!stopTaker) return reject(new ERR_WORKER_NOT_RUNNING());
+      stopTaker.ondone = (err, profile) => {
+        if (err) {
+          return reject(err);
+        }
+        resolve(profile);
+      };
+    });
+  };
+
+  async [SymbolAsyncDispose]() {
+    await this.stop();
+  }
+}
+
 class Worker extends EventEmitter {
   constructor(filename, options = kEmptyObject) {
     throwIfBuildingSnapshot('Creating workers');
@@ -508,37 +539,15 @@ class Worker extends EventEmitter {
   }
 
   // TODO(theanarkh): add options, such as sample_interval, CpuProfilingMode
-  startCpuProfile(name) {
-    validateString(name, 'name');
-    const startTaker = this[kHandle]?.startCpuProfile(name);
+  startCpuProfile() {
+    const startTaker = this[kHandle]?.startCpuProfile();
     return new Promise((resolve, reject) => {
       if (!startTaker) return reject(new ERR_WORKER_NOT_RUNNING());
-      startTaker.ondone = (err) => {
+      startTaker.ondone = (err, id) => {
         if (err) {
           return reject(err);
         }
-        let promise = null;
-        const stop = () => {
-          if (promise) {
-            return promise;
-          }
-          const stopTaker = this[kHandle]?.stopCpuProfile(name);
-          return promise = new Promise((resolve, reject) => {
-            if (!stopTaker) return reject(new ERR_WORKER_NOT_RUNNING());
-            stopTaker.ondone = (status, profile) => {
-              if (err) {
-                return reject(err);
-              }
-              resolve(profile);
-            };
-          });
-        };
-        resolve({
-          stop,
-          async [SymbolAsyncDispose]() {
-            await stop();
-          },
-        });
+        resolve(new CPUProfileHandle(this, id));
       };
     });
   }

src/env.cc

@@ -1064,7 +1064,7 @@ Environment::~Environment() {
   delete external_memory_accounter_;
   if (cpu_profiler_) {
     for (auto& it : pending_profiles_) {
-      cpu_profiler_->Stop(it.second);
+      cpu_profiler_->Stop(it);
     }
     cpu_profiler_->Dispose();
     cpu_profiler_ = nullptr;
@@ -2233,30 +2233,30 @@ void Environment::RunWeakRefCleanup() {
   isolate()->ClearKeptObjects();
 }
 
-v8::CpuProfilingResult Environment::StartCpuProfile(std::string_view name) {
+v8::CpuProfilingResult Environment::StartCpuProfile() {
   HandleScope handle_scope(isolate());
   if (!cpu_profiler_) {
     cpu_profiler_ = v8::CpuProfiler::New(isolate());
   }
-  Local<Value> title =
-      node::ToV8Value(context(), name, isolate()).ToLocalChecked();
-  v8::CpuProfilingResult result =
-      cpu_profiler_->Start(title.As<String>(), true);
+  v8::CpuProfilingResult result = cpu_profiler_->Start(
+      v8::CpuProfilingOptions{v8::CpuProfilingMode::kLeafNodeLineNumbers,
+                              v8::CpuProfilingOptions::kNoSampleLimit});
   if (result.status == v8::CpuProfilingStatus::kStarted) {
-    pending_profiles_.emplace(name, result.id);
+    pending_profiles_.push_back(result.id);
   }
   return result;
 }
 
-v8::CpuProfile* Environment::StopCpuProfile(std::string_view name) {
+v8::CpuProfile* Environment::StopCpuProfile(v8::ProfilerId profile_id) {
   if (!cpu_profiler_) {
     return nullptr;
   }
-  auto it = pending_profiles_.find(std::string(name));
+  auto it =
+      std::find(pending_profiles_.begin(), pending_profiles_.end(), profile_id);
   if (it == pending_profiles_.end()) {
     return nullptr;
   }
-  v8::CpuProfile* profile = cpu_profiler_->Stop(it->second);
+  v8::CpuProfile* profile = cpu_profiler_->Stop(*it);
   pending_profiles_.erase(it);
   return profile;
 }

src/env.h

@@ -1049,8 +1049,8 @@ class Environment final : public MemoryRetainer {
 
   inline void RemoveHeapSnapshotNearHeapLimitCallback(size_t heap_limit);
 
-  v8::CpuProfilingResult StartCpuProfile(std::string_view name);
-  v8::CpuProfile* StopCpuProfile(std::string_view name);
+  v8::CpuProfilingResult StartCpuProfile();
+  v8::CpuProfile* StopCpuProfile(v8::ProfilerId profile_id);
 
   // Field identifiers for exit_info_
   enum ExitInfoField {
@@ -1250,7 +1250,7 @@ class Environment final : public MemoryRetainer {
       released_allocated_buffers_;
 
   v8::CpuProfiler* cpu_profiler_ = nullptr;
-  std::unordered_map<std::string, v8::ProfilerId> pending_profiles_;
+  std::vector<v8::ProfilerId> pending_profiles_;
 };
 
 }  // namespace node

src/node_errors.h

@@ -48,7 +48,6 @@ void OOMErrorHandler(const char* location, const v8::OOMDetails& details);
   V(ERR_CLOSED_MESSAGE_PORT, Error)                                            \
   V(ERR_CONSTRUCT_CALL_REQUIRED, TypeError)                                    \
   V(ERR_CONSTRUCT_CALL_INVALID, TypeError)                                     \
-  V(ERR_CPU_PROFILE_ALREADY_STARTED, Error)                                    \
   V(ERR_CPU_PROFILE_NOT_STARTED, Error)                                        \
   V(ERR_CPU_PROFILE_TOO_MANY, Error)                                           \
   V(ERR_CRYPTO_CUSTOM_ENGINE_NOT_SUPPORTED, Error)                             \

src/node_worker.cc

@@ -915,9 +915,6 @@ void Worker::StartCpuProfile(const FunctionCallbackInfo<Value>& args) {
   ASSIGN_OR_RETURN_UNWRAP(&w, args.This());
   Environment* env = w->env();
 
-  CHECK(args[0]->IsString());
-  node::Utf8Value name(env->isolate(), args[0]);
-
   AsyncHooks::DefaultTriggerAsyncIdScope trigger_id_scope(w);
   Local<Object> wrap;
   if (!env->worker_cpu_profile_taker_template()
@@ -930,25 +927,23 @@ void Worker::StartCpuProfile(const FunctionCallbackInfo<Value>& args) {
       MakeDetachedBaseObject<WorkerCpuProfileTaker>(env, wrap);
 
   bool scheduled = w->RequestInterrupt([taker = std::move(taker),
-                                        name = name.ToString(),
                                         env](Environment* worker_env) mutable {
-    CpuProfilingResult result = worker_env->StartCpuProfile(name);
+    CpuProfilingResult result = worker_env->StartCpuProfile();
     env->SetImmediateThreadsafe(
-        [taker = std::move(taker),
-         status = result.status](Environment* env) mutable {
+        [taker = std::move(taker), result = result](Environment* env) mutable {
           Isolate* isolate = env->isolate();
           HandleScope handle_scope(isolate);
           Context::Scope context_scope(env->context());
           AsyncHooks::DefaultTriggerAsyncIdScope trigger_id_scope(taker.get());
           Local<Value> argv[] = {
-              Null(isolate),  // error
+              Null(isolate),       // error
+              Undefined(isolate),  // profile id
           };
-          if (status == CpuProfilingStatus::kAlreadyStarted) {
-            argv[0] = ERR_CPU_PROFILE_ALREADY_STARTED(
-                isolate, "CPU profile already started");
-          } else if (status == CpuProfilingStatus::kErrorTooManyProfilers) {
+          if (result.status == CpuProfilingStatus::kErrorTooManyProfilers) {
             argv[0] = ERR_CPU_PROFILE_TOO_MANY(
                 isolate, "There are too many CPU profiles");
+          } else if (result.status == CpuProfilingStatus::kStarted) {
+            argv[1] = Number::New(isolate, result.id);
           }
           taker->MakeCallback(env->ondone_string(), arraysize(argv), argv);
         },
@@ -965,8 +960,8 @@ void Worker::StopCpuProfile(const FunctionCallbackInfo<Value>& args) {
   ASSIGN_OR_RETURN_UNWRAP(&w, args.This());
 
   Environment* env = w->env();
-  CHECK(args[0]->IsString());
-  node::Utf8Value name(env->isolate(), args[0]);
+  CHECK(args[0]->IsUint32());
+  uint32_t profile_id = args[0]->Uint32Value(env->context()).FromJust();
 
   AsyncHooks::DefaultTriggerAsyncIdScope trigger_id_scope(w);
   Local<Object> wrap;
@@ -980,11 +975,11 @@ void Worker::StopCpuProfile(const FunctionCallbackInfo<Value>& args) {
       MakeDetachedBaseObject<WorkerCpuProfileTaker>(env, wrap);
 
   bool scheduled = w->RequestInterrupt([taker = std::move(taker),
-                                        name = name.ToString(),
+                                        profile_id = profile_id,
                                         env](Environment* worker_env) mutable {
     bool found = false;
     auto json_out_stream = std::make_unique<node::JSONOutputStream>();
-    CpuProfile* profile = worker_env->StopCpuProfile(name);
+    CpuProfile* profile = worker_env->StopCpuProfile(profile_id);
     if (profile) {
       profile->Serialize(json_out_stream.get(),
                          CpuProfile::SerializationFormat::kJSON);

test/parallel/test-worker-cpu-profile.js

@@ -8,40 +8,18 @@ const worker = new Worker(`
   parentPort.on('message', () => {});
   `, { eval: true });
 
-[
-  -1,
-  1.1,
-  NaN,
-  undefined,
-  {},
-  [],
-  null,
-  function() {},
-  Symbol(),
-  true,
-  Infinity,
-].forEach((name) => {
-  try {
-    worker.startCpuProfile(name);
-  } catch (e) {
-    assert.ok(/ERR_INVALID_ARG_TYPE/i.test(e.code));
-  }
-});
-
-const name = 'demo';
-
 worker.on('online', common.mustCall(async () => {
   {
-    const handle = await worker.startCpuProfile(name);
+    const handle = await worker.startCpuProfile();
     JSON.parse(await handle.stop());
     // Stop again
     JSON.parse(await handle.stop());
   }
 
   {
     const [handle1, handle2] = await Promise.all([
-      worker.startCpuProfile('demo1'),
-      worker.startCpuProfile('demo2'),
+      worker.startCpuProfile(),
+      worker.startCpuProfile(),
     ]);
     const [profile1, profile2] = await Promise.all([
       handle1.stop(),
@@ -52,22 +30,14 @@ worker.on('online', common.mustCall(async () => {
   }
 
   {
-    // Calling startCpuProfile twice with same name will throw an error
-    await worker.startCpuProfile(name);
-    try {
-      await worker.startCpuProfile(name);
-    } catch (e) {
-      assert.ok(/ERR_CPU_PROFILE_ALREADY_STARTED/i.test(e.code));
-    }
-    // Does not need to stop the profile because it will be stopped
-    // automatically when the worker is terminated
+    await worker.startCpuProfile();
+    // It will be stopped automatically when the worker is terminated
   }
-
   worker.terminate();
 }));
 
 worker.once('exit', common.mustCall(async () => {
-  await assert.rejects(worker.startCpuProfile(name), {
+  await assert.rejects(worker.startCpuProfile(), {
     code: 'ERR_WORKER_NOT_RUNNING'
   });
 }));

tools/doc/type-parser.mjs

@@ -344,6 +344,7 @@ const customTypesMap = {
   'Lock': 'worker_threads.html#class-lock',
   'LockManager': 'worker_threads.html#class-lockmanager',
   'LockManagerSnapshot': 'https://developer.mozilla.org/en-US/docs/Web/API/LockManagerSnapshot',
+  'CPUProfileHandle': 'v8.html#class-cpuprofilehandle',
 };
 
 const arrayPart = /(?:\[])+$/;