Add ServerCPULoadInfo() and ServerMemUsageInfo() admin API (#7038)

pkg/cpu/helpers.go

@@ -0,0 +1,30 @@
+/*
+ * Minio Cloud Storage, (C) 2019 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cpu
+
+import (
+	"math"
+)
+
+func round(num float64) int {
+	return int(num + math.Copysign(0.5, num))
+}
+
+func toFixed4(num float64) float64 {
+	output := math.Pow(10, float64(4))
+	return float64(round(num*output)) / output
+}