Updating dependency github.com/google/cadvisor to version 6a8d614

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/google/cadvisor/perf/manager_libpfm.go

@@ -0,0 +1,72 @@
+// +build libpfm,cgo
+
+// Copyright 2020 Google Inc. All Rights Reserved.
+//
+// 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.
+
+// Manager of perf events for containers.
+package perf
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/google/cadvisor/stats"
+)
+
+type manager struct {
+	events   Events
+	numCores int
+	stats.NoopDestroy
+}
+
+func NewManager(configFile string, numCores int) (stats.Manager, error) {
+	if configFile == "" {
+		return &stats.NoopManager{}, nil
+	}
+
+	file, err := os.Open(configFile)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to read configuration file %q: %q", configFile, err)
+	}
+
+	config, err := parseConfig(file)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to read configuration file %q: %q", configFile, err)
+	}
+
+	if areGroupedEventsUsed(config) {
+		return nil, fmt.Errorf("event grouping is not supported you must modify config file at %s", configFile)
+	}
+
+	return &manager{events: config, numCores: numCores}, nil
+}
+
+func areGroupedEventsUsed(events Events) bool {
+	for _, group := range events.Events {
+		if len(group) > 1 {
+			return true
+		}
+	}
+	return false
+}
+
+func (m *manager) GetCollector(cgroupPath string) (stats.Collector, error) {
+	collector := newCollector(cgroupPath, m.events, m.numCores)
+	err := collector.setup()
+	if err != nil {
+		collector.Destroy()
+		return &stats.NoopCollector{}, err
+	}
+	return collector, nil
+}