257 lines
7.4 KiB
Go
257 lines
7.4 KiB
Go
// Copyright 2014 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 libcontainer
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import (
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"fmt"
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"path"
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"time"
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"github.com/docker/libcontainer"
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"github.com/docker/libcontainer/cgroups"
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info "github.com/google/cadvisor/info/v1"
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"github.com/google/cadvisor/utils/sysinfo"
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)
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type CgroupSubsystems struct {
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// Cgroup subsystem mounts.
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// e.g.: "/sys/fs/cgroup/cpu" -> ["cpu", "cpuacct"]
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Mounts []cgroups.Mount
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// Cgroup subsystem to their mount location.
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// e.g.: "cpu" -> "/sys/fs/cgroup/cpu"
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MountPoints map[string]string
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}
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// Get information about the cgroup subsystems.
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func GetCgroupSubsystems() (CgroupSubsystems, error) {
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// Get all cgroup mounts.
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allCgroups, err := cgroups.GetCgroupMounts()
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if err != nil {
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return CgroupSubsystems{}, err
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}
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if len(allCgroups) == 0 {
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return CgroupSubsystems{}, fmt.Errorf("failed to find cgroup mounts")
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}
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// Trim the mounts to only the subsystems we care about.
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supportedCgroups := make([]cgroups.Mount, 0, len(allCgroups))
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mountPoints := make(map[string]string, len(allCgroups))
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for _, mount := range allCgroups {
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for _, subsystem := range mount.Subsystems {
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if _, ok := supportedSubsystems[subsystem]; ok {
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supportedCgroups = append(supportedCgroups, mount)
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mountPoints[subsystem] = mount.Mountpoint
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}
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}
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}
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return CgroupSubsystems{
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Mounts: supportedCgroups,
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MountPoints: mountPoints,
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}, nil
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}
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// Cgroup subsystems we support listing (should be the minimal set we need stats from).
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var supportedSubsystems map[string]struct{} = map[string]struct{}{
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"cpu": {},
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"cpuacct": {},
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"memory": {},
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"cpuset": {},
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"blkio": {},
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}
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// Get cgroup and networking stats of the specified container
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func GetStats(cgroupManager cgroups.Manager, networkInterfaces []string) (*info.ContainerStats, error) {
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cgroupStats, err := cgroupManager.GetStats()
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if err != nil {
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return nil, err
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}
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libcontainerStats := &libcontainer.Stats{
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CgroupStats: cgroupStats,
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}
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stats := toContainerStats(libcontainerStats)
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// TODO(rjnagal): Use networking stats directly from libcontainer.
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stats.Network.Interfaces = make([]info.InterfaceStats, len(networkInterfaces))
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for i := range networkInterfaces {
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interfaceStats, err := sysinfo.GetNetworkStats(networkInterfaces[i])
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if err != nil {
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return stats, err
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}
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stats.Network.Interfaces[i] = interfaceStats
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}
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// For backwards compatibility.
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if len(networkInterfaces) > 0 {
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stats.Network.InterfaceStats = stats.Network.Interfaces[0]
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}
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return stats, nil
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}
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func GetProcesses(cgroupManager cgroups.Manager) ([]int, error) {
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pids, err := cgroupManager.GetPids()
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if err != nil {
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return nil, err
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}
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return pids, nil
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}
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func DockerStateDir(dockerRoot string) string {
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return path.Join(dockerRoot, "containers")
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}
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func DiskStatsCopy0(major, minor uint64) *info.PerDiskStats {
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disk := info.PerDiskStats{
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Major: major,
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Minor: minor,
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}
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disk.Stats = make(map[string]uint64)
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return &disk
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}
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type DiskKey struct {
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Major uint64
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Minor uint64
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}
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func DiskStatsCopy1(disk_stat map[DiskKey]*info.PerDiskStats) []info.PerDiskStats {
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i := 0
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stat := make([]info.PerDiskStats, len(disk_stat))
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for _, disk := range disk_stat {
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stat[i] = *disk
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i++
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}
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return stat
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}
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func DiskStatsCopy(blkio_stats []cgroups.BlkioStatEntry) (stat []info.PerDiskStats) {
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if len(blkio_stats) == 0 {
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return
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}
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disk_stat := make(map[DiskKey]*info.PerDiskStats)
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for i := range blkio_stats {
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major := blkio_stats[i].Major
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minor := blkio_stats[i].Minor
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disk_key := DiskKey{
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Major: major,
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Minor: minor,
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}
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diskp, ok := disk_stat[disk_key]
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if !ok {
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diskp = DiskStatsCopy0(major, minor)
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disk_stat[disk_key] = diskp
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}
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op := blkio_stats[i].Op
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if op == "" {
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op = "Count"
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}
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diskp.Stats[op] = blkio_stats[i].Value
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}
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return DiskStatsCopy1(disk_stat)
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}
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// Convert libcontainer stats to info.ContainerStats.
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func toContainerStats0(s *cgroups.Stats, ret *info.ContainerStats) {
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ret.Cpu.Usage.User = s.CpuStats.CpuUsage.UsageInUsermode
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ret.Cpu.Usage.System = s.CpuStats.CpuUsage.UsageInKernelmode
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n := len(s.CpuStats.CpuUsage.PercpuUsage)
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ret.Cpu.Usage.PerCpu = make([]uint64, n)
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ret.Cpu.Usage.Total = 0
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for i := 0; i < n; i++ {
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ret.Cpu.Usage.PerCpu[i] = s.CpuStats.CpuUsage.PercpuUsage[i]
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ret.Cpu.Usage.Total += s.CpuStats.CpuUsage.PercpuUsage[i]
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}
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}
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func toContainerStats1(s *cgroups.Stats, ret *info.ContainerStats) {
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ret.DiskIo.IoServiceBytes = DiskStatsCopy(s.BlkioStats.IoServiceBytesRecursive)
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ret.DiskIo.IoServiced = DiskStatsCopy(s.BlkioStats.IoServicedRecursive)
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ret.DiskIo.IoQueued = DiskStatsCopy(s.BlkioStats.IoQueuedRecursive)
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ret.DiskIo.Sectors = DiskStatsCopy(s.BlkioStats.SectorsRecursive)
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ret.DiskIo.IoServiceTime = DiskStatsCopy(s.BlkioStats.IoServiceTimeRecursive)
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ret.DiskIo.IoWaitTime = DiskStatsCopy(s.BlkioStats.IoWaitTimeRecursive)
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ret.DiskIo.IoMerged = DiskStatsCopy(s.BlkioStats.IoMergedRecursive)
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ret.DiskIo.IoTime = DiskStatsCopy(s.BlkioStats.IoTimeRecursive)
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}
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func toContainerStats2(s *cgroups.Stats, ret *info.ContainerStats) {
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ret.Memory.Usage = s.MemoryStats.Usage
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if v, ok := s.MemoryStats.Stats["pgfault"]; ok {
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ret.Memory.ContainerData.Pgfault = v
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ret.Memory.HierarchicalData.Pgfault = v
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}
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if v, ok := s.MemoryStats.Stats["pgmajfault"]; ok {
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ret.Memory.ContainerData.Pgmajfault = v
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ret.Memory.HierarchicalData.Pgmajfault = v
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}
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if v, ok := s.MemoryStats.Stats["total_inactive_anon"]; ok {
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workingSet := ret.Memory.Usage
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if workingSet < v {
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workingSet = 0
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} else {
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workingSet -= v
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}
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if v, ok := s.MemoryStats.Stats["total_inactive_file"]; ok {
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if workingSet < v {
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workingSet = 0
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} else {
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workingSet -= v
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}
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}
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ret.Memory.WorkingSet = workingSet
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}
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}
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func toContainerStats3(libcontainerStats *libcontainer.Stats, ret *info.ContainerStats) {
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ret.Network.Interfaces = make([]info.InterfaceStats, len(libcontainerStats.Interfaces))
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for i := range libcontainerStats.Interfaces {
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ret.Network.Interfaces[i] = info.InterfaceStats{
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Name: libcontainerStats.Interfaces[i].Name,
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RxBytes: libcontainerStats.Interfaces[i].RxBytes,
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RxPackets: libcontainerStats.Interfaces[i].RxPackets,
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RxErrors: libcontainerStats.Interfaces[i].RxErrors,
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RxDropped: libcontainerStats.Interfaces[i].RxDropped,
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TxBytes: libcontainerStats.Interfaces[i].TxBytes,
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TxPackets: libcontainerStats.Interfaces[i].TxPackets,
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TxErrors: libcontainerStats.Interfaces[i].TxErrors,
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TxDropped: libcontainerStats.Interfaces[i].TxDropped,
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}
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}
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// Add to base struct for backwards compatibility.
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if len(ret.Network.Interfaces) > 0 {
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ret.Network.InterfaceStats = ret.Network.Interfaces[0]
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}
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}
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func toContainerStats(libcontainerStats *libcontainer.Stats) *info.ContainerStats {
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s := libcontainerStats.CgroupStats
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ret := new(info.ContainerStats)
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ret.Timestamp = time.Now()
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if s != nil {
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toContainerStats0(s, ret)
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toContainerStats1(s, ret)
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toContainerStats2(s, ret)
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}
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if len(libcontainerStats.Interfaces) > 0 {
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toContainerStats3(libcontainerStats, ret)
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}
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return ret
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}
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