os: improve loadavg() performance

PR-URL: https://github.com/nodejs/node/pull/11516
Reviewed-By: Jackson Tian <shyvo1987@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

1 files changed, 7 insertions, 7 deletions

diff --git a/src/node_os.cc b/src/node_os.cc
index 97b1a1d08da..211ac3d01dd 100644
--- a/src/node_os.cc
+++ b/src/node_os.cc
@@ -28,8 +28,10 @@ namespace node {
 namespace os {
 
 using v8::Array;
+using v8::ArrayBuffer;
 using v8::Boolean;
 using v8::Context;
+using v8::Float64Array;
 using v8::FunctionCallbackInfo;
 using v8::Integer;
 using v8::Local;
@@ -182,14 +184,12 @@ static void GetUptime(const FunctionCallbackInfo<Value>& args) {
 
 
 static void GetLoadAvg(const FunctionCallbackInfo<Value>& args) {
-  Environment* env = Environment::GetCurrent(args);
-  double loadavg[3];
+  CHECK(args[0]->IsFloat64Array());
+  Local<Float64Array> array = args[0].As<Float64Array>();
+  CHECK_EQ(array->Length(), 3);
+  Local<ArrayBuffer> ab = array->Buffer();
+  double* loadavg = static_cast<double*>(ab->GetContents().Data());
   uv_loadavg(loadavg);
-  Local<Array> loads = Array::New(env->isolate(), 3);
-  loads->Set(0, Number::New(env->isolate(), loadavg[0]));
-  loads->Set(1, Number::New(env->isolate(), loadavg[1]));
-  loads->Set(2, Number::New(env->isolate(), loadavg[2]));
-  args.GetReturnValue().Set(loads);
 }