tasks: add Linux rdt support

Add support for configuring the Linux resctrl pseudo-filesystem with
goresctrl library. The functionality is integrated in the
"io.containerd.service.v1.tasks-service" plugin.

Signed-off-by: Markus Lehtonen <markus.lehtonen@intel.com>

services/tasks/rdt_linux.go

@@ -0,0 +1,50 @@
+//go:build linux && !no_rdt
+// +build linux,!no_rdt
+
+/*
+   Copyright The containerd 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 tasks
+
+import (
+	"github.com/containerd/containerd/log"
+
+	"github.com/intel/goresctrl/pkg/rdt"
+	"github.com/pkg/errors"
+)
+
+const (
+	// ResctrlPrefix is the prefix used for class/closid directories under the resctrl filesystem
+	ResctrlPrefix = ""
+)
+
+func initRdt(configFilePath string) error {
+	if configFilePath == "" {
+		log.L.Debug("No RDT config file specified, RDT not configured")
+		return nil
+	}
+
+	if err := rdt.Initialize(ResctrlPrefix); err != nil {
+		return errors.Wrap(err, "RDT not enabled")
+	}
+
+	if err := rdt.SetConfigFromFile(configFilePath, true); err != nil {
+		return err
+	}
+
+	return nil
+
+}