Merge pull request #115425 from pohly/scheduler-perf-benchstat

scheduler perf: benchstat support

test/utils/ktesting/ktesting.go

@@ -0,0 +1,77 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+
+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 ktesting is a wrapper around k8s.io/klog/v2/ktesting. It provides
+// those (and only those) functions that test code in Kubernetes should use,
+// plus better dumping of complex datatypes. It adds the klog command line
+// flags and increases the default verbosity to 5.
+package ktesting
+
+import (
+	"context"
+	"flag"
+	"fmt"
+
+	_ "k8s.io/component-base/logs/testinit"
+	"k8s.io/klog/v2"
+	"k8s.io/klog/v2/ktesting"
+	// "k8s.io/kubernetes/test/utils/format"
+)
+
+func init() {
+	// This is a good default for unit tests. Benchmarks should add their own
+	// init function or TestMain to lower the default, for example to 2.
+	SetDefaultVerbosity(5)
+}
+
+// SetDefaultVerbosity can be called during init to modify the default
+// log verbosity of the program.
+func SetDefaultVerbosity(v int) {
+	f := flag.CommandLine.Lookup("v")
+	_ = f.Value.Set(fmt.Sprintf("%d", v))
+}
+
+// NewTestContext is a wrapper around ktesting.NewTestContext with settings
+// specific to Kubernetes.
+func NewTestContext(tl ktesting.TL) (klog.Logger, context.Context) {
+	config := ktesting.NewConfig(
+		// TODO (pohly): merge
+		// https://github.com/kubernetes/klog/pull/363, new klog
+		// release, update and merge
+		// https://github.com/kubernetes/kubernetes/pull/115277, then
+		// uncomment this.
+		//
+		// ktesting.AnyToString(format.AnyToString),
+		ktesting.VerbosityFlagName("v"),
+		ktesting.VModuleFlagName("vmodule"),
+	)
+
+	// Copy klog settings instead of making the ktesting logger
+	// configurable directly.
+	var fs flag.FlagSet
+	config.AddFlags(&fs)
+	for _, name := range []string{"v", "vmodule"} {
+		from := flag.CommandLine.Lookup(name)
+		to := fs.Lookup(name)
+		if err := to.Value.Set(from.Value.String()); err != nil {
+			panic(err)
+		}
+	}
+
+	logger := ktesting.NewLogger(tl, config)
+	ctx := klog.NewContext(context.Background(), logger)
+	return logger, ctx
+}