55 lines
1.8 KiB
Go
55 lines
1.8 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cpuload
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import (
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"fmt"
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"github.com/golang/glog"
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"github.com/google/cadvisor/info"
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"github.com/google/cadvisor/utils/cpuload/netlink"
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"github.com/google/cadvisor/utils/cpuload/scheddebug"
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)
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type CpuLoadReader interface {
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// Start the reader.
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Start() error
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// Stop the reader and clean up internal state.
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Stop()
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// Retrieve Cpu load for a given group.
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// name is the full hierarchical name of the container.
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// Path is an absolute filesystem path for a container under CPU cgroup hierarchy.
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GetCpuLoad(name string, path string) (info.LoadStats, error)
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}
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func New() (CpuLoadReader, error) {
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// First try to create a scheddebug based load reader.
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schedReader, schedErr := scheddebug.New()
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if schedErr == nil {
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glog.Info("Using a sched debug based load reader")
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return schedReader, nil
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}
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glog.V(1).Infof("failed to create a scheddebug-based cpu load reader: %v", schedErr)
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// netlink gives us more data than scheddebug, but it doesn't work inside network namespaces. It also needs to be hierarchical.
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reader, err := netlink.New()
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if err != nil {
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return nil, fmt.Errorf("failed to create any cpu load reader - netlink based (%v), scheddebug based (%v)", err, schedErr)
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}
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glog.Info("Using a netlink-based load reader")
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return reader, nil
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}
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