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helpers.go
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/
helpers.go
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// Copyright 2014 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.
package libcontainer
import (
"fmt"
"time"
"github.com/docker/libcontainer"
"github.com/docker/libcontainer/cgroups"
cgroupfs "github.com/docker/libcontainer/cgroups/fs"
"github.com/docker/libcontainer/network"
info "github.com/google/cadvisor/info/v1"
)
type CgroupSubsystems struct {
// Cgroup subsystem mounts.
// e.g.: "/sys/fs/cgroup/cpu" -> ["cpu", "cpuacct"]
Mounts []cgroups.Mount
// Cgroup subsystem to their mount location.
// e.g.: "cpu" -> "/sys/fs/cgroup/cpu"
MountPoints map[string]string
}
// Get information about the cgroup subsystems.
func GetCgroupSubsystems() (CgroupSubsystems, error) {
// Get all cgroup mounts.
allCgroups, err := cgroups.GetCgroupMounts()
if err != nil {
return CgroupSubsystems{}, err
}
if len(allCgroups) == 0 {
return CgroupSubsystems{}, fmt.Errorf("failed to find cgroup mounts")
}
// Trim the mounts to only the subsystems we care about.
supportedCgroups := make([]cgroups.Mount, 0, len(allCgroups))
mountPoints := make(map[string]string, len(allCgroups))
for _, mount := range allCgroups {
for _, subsystem := range mount.Subsystems {
if _, ok := supportedSubsystems[subsystem]; ok {
supportedCgroups = append(supportedCgroups, mount)
mountPoints[subsystem] = mount.Mountpoint
}
}
}
return CgroupSubsystems{
Mounts: supportedCgroups,
MountPoints: mountPoints,
}, nil
}
// Cgroup subsystems we support listing (should be the minimal set we need stats from).
var supportedSubsystems map[string]struct{} = map[string]struct{}{
"cpu": {},
"cpuacct": {},
"memory": {},
"cpuset": {},
"blkio": {},
}
// Get stats of the specified container
func GetStats(cgroupPaths map[string]string, state *libcontainer.State) (*info.ContainerStats, error) {
// TODO(vmarmol): Use libcontainer's Stats() in the new API when that is ready.
stats := &libcontainer.ContainerStats{}
var err error
stats.CgroupStats, err = cgroupfs.GetStats(cgroupPaths)
if err != nil {
return &info.ContainerStats{}, err
}
stats.NetworkStats, err = network.GetStats(&state.NetworkState)
if err != nil {
return &info.ContainerStats{}, err
}
return toContainerStats(stats), nil
}
func DiskStatsCopy(blkio_stats []cgroups.BlkioStatEntry) (stat []info.PerDiskStats) {
if len(blkio_stats) == 0 {
return
}
type DiskKey struct {
Major uint64
Minor uint64
}
disk_stat := make(map[DiskKey]*info.PerDiskStats)
for i := range blkio_stats {
major := blkio_stats[i].Major
minor := blkio_stats[i].Minor
disk_key := DiskKey{
Major: major,
Minor: minor,
}
diskp, ok := disk_stat[disk_key]
if !ok {
disk := info.PerDiskStats{
Major: major,
Minor: minor,
}
disk.Stats = make(map[string]uint64)
diskp = &disk
disk_stat[disk_key] = diskp
}
op := blkio_stats[i].Op
if op == "" {
op = "Count"
}
diskp.Stats[op] = blkio_stats[i].Value
}
i := 0
stat = make([]info.PerDiskStats, len(disk_stat))
for _, disk := range disk_stat {
stat[i] = *disk
i++
}
return
}
// Convert libcontainer stats to info.ContainerStats.
func toContainerStats(libcontainerStats *libcontainer.ContainerStats) *info.ContainerStats {
s := libcontainerStats.CgroupStats
ret := new(info.ContainerStats)
ret.Timestamp = time.Now()
if s != nil {
ret.Cpu.Usage.User = s.CpuStats.CpuUsage.UsageInUsermode
ret.Cpu.Usage.System = s.CpuStats.CpuUsage.UsageInKernelmode
n := len(s.CpuStats.CpuUsage.PercpuUsage)
ret.Cpu.Usage.PerCpu = make([]uint64, n)
ret.Cpu.Usage.Total = 0
for i := 0; i < n; i++ {
ret.Cpu.Usage.PerCpu[i] = s.CpuStats.CpuUsage.PercpuUsage[i]
ret.Cpu.Usage.Total += s.CpuStats.CpuUsage.PercpuUsage[i]
}
ret.DiskIo.IoServiceBytes = DiskStatsCopy(s.BlkioStats.IoServiceBytesRecursive)
ret.DiskIo.IoServiced = DiskStatsCopy(s.BlkioStats.IoServicedRecursive)
ret.DiskIo.IoQueued = DiskStatsCopy(s.BlkioStats.IoQueuedRecursive)
ret.DiskIo.Sectors = DiskStatsCopy(s.BlkioStats.SectorsRecursive)
ret.DiskIo.IoServiceTime = DiskStatsCopy(s.BlkioStats.IoServiceTimeRecursive)
ret.DiskIo.IoWaitTime = DiskStatsCopy(s.BlkioStats.IoWaitTimeRecursive)
ret.DiskIo.IoMerged = DiskStatsCopy(s.BlkioStats.IoMergedRecursive)
ret.DiskIo.IoTime = DiskStatsCopy(s.BlkioStats.IoTimeRecursive)
ret.Memory.Usage = s.MemoryStats.Usage
if v, ok := s.MemoryStats.Stats["pgfault"]; ok {
ret.Memory.ContainerData.Pgfault = v
ret.Memory.HierarchicalData.Pgfault = v
}
if v, ok := s.MemoryStats.Stats["pgmajfault"]; ok {
ret.Memory.ContainerData.Pgmajfault = v
ret.Memory.HierarchicalData.Pgmajfault = v
}
if v, ok := s.MemoryStats.Stats["total_inactive_anon"]; ok {
ret.Memory.WorkingSet = ret.Memory.Usage - v
if v, ok := s.MemoryStats.Stats["total_active_file"]; ok {
ret.Memory.WorkingSet -= v
}
}
}
// TODO(vishh): Perform a deep copy or alias libcontainer network stats.
if libcontainerStats.NetworkStats != nil {
ret.Network = *(*info.NetworkStats)(libcontainerStats.NetworkStats)
}
return ret
}