79 lines
2.2 KiB
Go
79 lines
2.2 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 netlink
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import (
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"fmt"
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"os"
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"github.com/golang/glog"
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info "github.com/google/cadvisor/info/v1"
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)
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type NetlinkReader struct {
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familyId uint16
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conn *Connection
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}
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func New() (*NetlinkReader, error) {
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conn, err := newConnection()
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if err != nil {
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return nil, fmt.Errorf("failed to create a new connection: %s", err)
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}
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id, err := getFamilyId(conn)
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if err != nil {
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return nil, fmt.Errorf("failed to get netlink family id for task stats: %s", err)
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}
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glog.V(4).Infof("Family id for taskstats: %d", id)
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return &NetlinkReader{
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familyId: id,
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conn: conn,
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}, nil
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}
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func (self *NetlinkReader) Stop() {
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if self.conn != nil {
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self.conn.Close()
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}
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}
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func (self *NetlinkReader) Start() error {
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// We do the start setup for netlink in New(). Nothing to do here.
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return nil
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}
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// Returns instantaneous number of running tasks in a group.
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// Caller can use historical data to calculate cpu load.
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// path is an absolute filesystem path for a container under the CPU cgroup hierarchy.
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// NOTE: non-hierarchical load is returned. It does not include load for subcontainers.
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func (self *NetlinkReader) GetCpuLoad(name string, path string) (info.LoadStats, error) {
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if len(path) == 0 {
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return info.LoadStats{}, fmt.Errorf("cgroup path can not be empty!")
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}
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cfd, err := os.Open(path)
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if err != nil {
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return info.LoadStats{}, fmt.Errorf("failed to open cgroup path %s: %q", path, err)
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}
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stats, err := getLoadStats(self.familyId, cfd.Fd(), self.conn)
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if err != nil {
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return info.LoadStats{}, err
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}
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glog.V(4).Infof("Task stats for %q: %+v", path, stats)
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return stats, nil
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}
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