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lib,src: remove cpu profiler idle notifier #34010

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lib,src: remove cpu profiler idle notifier #34010

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lib,src: remove cpu profiler idle notifier
bnoordhuis Jun 22, 2020
49951ae
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bnoordhuis Jun 23, 2020
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4 changes: 2 additions & 2 deletions lib/internal/bootstrap/switches/is_main_thread.js
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Expand Up @@ -6,8 +6,8 @@ const rawMethods = internalBinding('process_methods');
// TODO(joyeecheung): deprecate and remove these underscore methods
process._debugProcess = rawMethods._debugProcess;
process._debugEnd = rawMethods._debugEnd;
process._startProfilerIdleNotifier = rawMethods._startProfilerIdleNotifier;
process._stopProfilerIdleNotifier = rawMethods._stopProfilerIdleNotifier;
process._startProfilerIdleNotifier = () => {};
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process._stopProfilerIdleNotifier = () => {};
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@addaleax @BridgeAR I turned them into no-ops like #33138 does. I feel less strongly than Anna about emitting warnings but I also don't really see the point because the functionality has been broken-ish for a long time. Doing nothing is more correct than doing the wrong thing, IMO. :-)


function defineStream(name, getter) {
ObjectDefineProperty(process, name, {
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2 changes: 0 additions & 2 deletions lib/internal/bootstrap/switches/is_not_main_thread.js
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Expand Up @@ -4,8 +4,6 @@ const { ObjectDefineProperty } = primordials;

delete process._debugProcess;
delete process._debugEnd;
delete process._startProfilerIdleNotifier;
delete process._stopProfilerIdleNotifier;

function defineStream(name, getter) {
ObjectDefineProperty(process, name, {
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2 changes: 1 addition & 1 deletion src/api/environment.cc
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Expand Up @@ -422,7 +422,7 @@ MaybeLocal<Value> LoadEnvironment(
Environment* env,
StartExecutionCallback cb,
std::unique_ptr<InspectorParentHandle> removeme) {
env->InitializeLibuv(per_process::v8_is_profiling);
env->InitializeLibuv();
env->InitializeDiagnostics();

return StartExecution(env, cb);
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4 changes: 0 additions & 4 deletions src/env-inl.h
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Expand Up @@ -378,10 +378,6 @@ inline Environment* Environment::GetThreadLocalEnv() {
return static_cast<Environment*>(uv_key_get(&thread_local_env));
}

inline bool Environment::profiler_idle_notifier_started() const {
return profiler_idle_notifier_started_;
}

inline v8::Isolate* Environment::isolate() const {
return isolate_;
}
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44 changes: 1 addition & 43 deletions src/env.cc
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Expand Up @@ -485,7 +485,7 @@ Environment::~Environment() {
CHECK_EQ(base_object_count_, 0);
}

void Environment::InitializeLibuv(bool start_profiler_idle_notifier) {
void Environment::InitializeLibuv() {
HandleScope handle_scope(isolate());
Context::Scope context_scope(context());

Expand All @@ -499,17 +499,6 @@ void Environment::InitializeLibuv(bool start_profiler_idle_notifier) {

uv_check_start(immediate_check_handle(), CheckImmediate);

// Inform V8's CPU profiler when we're idle. The profiler is sampling-based
// but not all samples are created equal; mark the wall clock time spent in
// epoll_wait() and friends so profiling tools can filter it out. The samples
// still end up in v8.log but with state=IDLE rather than state=EXTERNAL.
// TODO(bnoordhuis) Depends on a libuv implementation detail that we should
// probably fortify in the API contract, namely that the last started prepare
// or check watcher runs first. It's not 100% foolproof; if an add-on starts
// a prepare or check watcher after us, any samples attributed to its callback
// will be recorded with state=IDLE.
uv_prepare_init(event_loop(), &idle_prepare_handle_);
uv_check_init(event_loop(), &idle_check_handle_);
uv_async_init(
event_loop(),
&task_queues_async_,
Expand All @@ -518,8 +507,6 @@ void Environment::InitializeLibuv(bool start_profiler_idle_notifier) {
&Environment::task_queues_async_, async);
env->RunAndClearNativeImmediates();
});
uv_unref(reinterpret_cast<uv_handle_t*>(&idle_prepare_handle_));
uv_unref(reinterpret_cast<uv_handle_t*>(&idle_check_handle_));
uv_unref(reinterpret_cast<uv_handle_t*>(&task_queues_async_));

{
Expand All @@ -536,10 +523,6 @@ void Environment::InitializeLibuv(bool start_profiler_idle_notifier) {
// the one environment per process setup, but will be called in
// FreeEnvironment.
RegisterHandleCleanups();

if (start_profiler_idle_notifier) {
StartProfilerIdleNotifier();
}
}

void Environment::ExitEnv() {
Expand Down Expand Up @@ -567,8 +550,6 @@ void Environment::RegisterHandleCleanups() {
register_handle(reinterpret_cast<uv_handle_t*>(timer_handle()));
register_handle(reinterpret_cast<uv_handle_t*>(immediate_check_handle()));
register_handle(reinterpret_cast<uv_handle_t*>(immediate_idle_handle()));
register_handle(reinterpret_cast<uv_handle_t*>(&idle_prepare_handle_));
register_handle(reinterpret_cast<uv_handle_t*>(&idle_check_handle_));
register_handle(reinterpret_cast<uv_handle_t*>(&task_queues_async_));
}

Expand Down Expand Up @@ -600,29 +581,6 @@ void Environment::CleanupHandles() {
}
}

void Environment::StartProfilerIdleNotifier() {
if (profiler_idle_notifier_started_)
return;

profiler_idle_notifier_started_ = true;

uv_prepare_start(&idle_prepare_handle_, [](uv_prepare_t* handle) {
Environment* env = ContainerOf(&Environment::idle_prepare_handle_, handle);
env->isolate()->SetIdle(true);
});

uv_check_start(&idle_check_handle_, [](uv_check_t* handle) {
Environment* env = ContainerOf(&Environment::idle_check_handle_, handle);
env->isolate()->SetIdle(false);
});
}

void Environment::StopProfilerIdleNotifier() {
profiler_idle_notifier_started_ = false;
uv_prepare_stop(&idle_prepare_handle_);
uv_check_stop(&idle_check_handle_);
}

void Environment::PrintSyncTrace() const {
if (!trace_sync_io_) return;

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9 changes: 1 addition & 8 deletions src/env.h
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Expand Up @@ -921,7 +921,7 @@ class Environment : public MemoryRetainer {
ThreadId thread_id);
~Environment() override;

void InitializeLibuv(bool start_profiler_idle_notifier);
void InitializeLibuv();
inline const std::vector<std::string>& exec_argv();
inline const std::vector<std::string>& argv();
const std::string& exec_path() const;
Expand Down Expand Up @@ -951,10 +951,6 @@ class Environment : public MemoryRetainer {
inline void AssignToContext(v8::Local<v8::Context> context,
const ContextInfo& info);

void StartProfilerIdleNotifier();
void StopProfilerIdleNotifier();
inline bool profiler_idle_notifier_started() const;

inline v8::Isolate* isolate() const;
inline uv_loop_t* event_loop() const;
inline void TryLoadAddon(
Expand Down Expand Up @@ -1281,11 +1277,8 @@ class Environment : public MemoryRetainer {
uv_timer_t timer_handle_;
uv_check_t immediate_check_handle_;
uv_idle_t immediate_idle_handle_;
uv_prepare_t idle_prepare_handle_;
uv_check_t idle_check_handle_;
uv_async_t task_queues_async_;
int64_t task_queues_async_refs_ = 0;
bool profiler_idle_notifier_started_ = false;

AsyncHooks async_hooks_;
ImmediateInfo immediate_info_;
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12 changes: 1 addition & 11 deletions src/node.cc
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Expand Up @@ -148,8 +148,6 @@ bool v8_initialized = false;
// node_internals.h
// process-relative uptime base in nanoseconds, initialized in node::Start()
uint64_t node_start_time;
// Tells whether --prof is passed.
bool v8_is_profiling = false;

// node_v8_platform-inl.h
struct V8Platform v8_platform;
Expand Down Expand Up @@ -786,19 +784,11 @@ int ProcessGlobalArgs(std::vector<std::string>* args,
env_opts->abort_on_uncaught_exception = true;
}

// TODO(bnoordhuis) Intercept --prof arguments and start the CPU profiler
// manually? That would give us a little more control over its runtime
// behavior but it could also interfere with the user's intentions in ways
// we fail to anticipate. Dillema.
if (std::find(v8_args.begin(), v8_args.end(), "--prof") != v8_args.end()) {
per_process::v8_is_profiling = true;
}

#ifdef __POSIX__
// Block SIGPROF signals when sleeping in epoll_wait/kevent/etc. Avoids the
// performance penalty of frequent EINTR wakeups when the profiler is running.
// Only do this for v8.log profiling, as it breaks v8::CpuProfiler users.
if (per_process::v8_is_profiling) {
if (std::find(v8_args.begin(), v8_args.end(), "--prof") != v8_args.end()) {
uv_loop_configure(uv_default_loop(), UV_LOOP_BLOCK_SIGNAL, SIGPROF);
}
#endif
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1 change: 0 additions & 1 deletion src/node_internals.h
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Expand Up @@ -55,7 +55,6 @@ class NativeModuleLoader;
namespace per_process {
extern Mutex env_var_mutex;
extern uint64_t node_start_time;
extern bool v8_is_profiling;
} // namespace per_process

// Forward declaration
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14 changes: 0 additions & 14 deletions src/node_process_methods.cc
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Expand Up @@ -196,16 +196,6 @@ void RawDebug(const FunctionCallbackInfo<Value>& args) {
fflush(stderr);
}

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

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

static void Umask(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(env->has_run_bootstrapping_code());
Expand Down Expand Up @@ -529,10 +519,6 @@ static void InitializeProcessMethods(Local<Object> target,
env->SetMethod(target, "chdir", Chdir);
}

env->SetMethod(
target, "_startProfilerIdleNotifier", StartProfilerIdleNotifier);
env->SetMethod(target, "_stopProfilerIdleNotifier", StopProfilerIdleNotifier);

env->SetMethod(target, "umask", Umask);
env->SetMethod(target, "_rawDebug", RawDebug);
env->SetMethod(target, "memoryUsage", MemoryUsage);
Expand Down