mirror of
https://github.com/containers/podman
synced 2024-10-22 02:03:38 +00:00
dd81a44ccf
the compilation demands of having libpod in main is a burden for the remote client compilations. to combat this, we should move the use of libpod structs, vars, constants, and functions into the adapter code where it will only be compiled by the local client. this should result in cleaner code organization and smaller binaries. it should also help if we ever need to compile the remote client on non-Linux operating systems natively (not cross-compiled). Signed-off-by: baude <bbaude@redhat.com>
125 lines
3.5 KiB
Go
125 lines
3.5 KiB
Go
// +build linux
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package libpod
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import (
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"strings"
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"syscall"
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"time"
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"github.com/containerd/cgroups"
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"github.com/containers/libpod/libpod/define"
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"github.com/pkg/errors"
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)
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// GetContainerStats gets the running stats for a given container
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func (c *Container) GetContainerStats(previousStats *ContainerStats) (*ContainerStats, error) {
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stats := new(ContainerStats)
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stats.ContainerID = c.ID()
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stats.Name = c.Name()
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if !c.batched {
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c.lock.Lock()
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defer c.lock.Unlock()
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if err := c.syncContainer(); err != nil {
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return stats, err
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}
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}
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if c.state.State != ContainerStateRunning {
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return stats, define.ErrCtrStateInvalid
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}
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cgroupPath, err := c.CGroupPath()
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if err != nil {
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return nil, err
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}
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v1CGroups := GetV1CGroups(getExcludedCGroups())
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cgroup, err := cgroups.Load(v1CGroups, cgroups.StaticPath(cgroupPath))
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if err != nil {
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return stats, errors.Wrapf(err, "unable to load cgroup at %s", cgroupPath)
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}
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// Ubuntu does not have swap memory in cgroups because swap is often not enabled.
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cgroupStats, err := cgroup.Stat(cgroups.IgnoreNotExist)
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if err != nil {
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return stats, errors.Wrapf(err, "unable to obtain cgroup stats")
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}
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conState := c.state.State
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if err != nil {
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return stats, errors.Wrapf(err, "unable to determine container state")
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}
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netStats, err := getContainerNetIO(c)
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if err != nil {
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return nil, err
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}
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previousCPU := previousStats.CPUNano
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previousSystem := previousStats.SystemNano
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stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, previousSystem)
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stats.MemUsage = cgroupStats.Memory.Usage.Usage
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stats.MemLimit = getMemLimit(cgroupStats.Memory.Usage.Limit)
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stats.MemPerc = (float64(stats.MemUsage) / float64(stats.MemLimit)) * 100
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stats.PIDs = 0
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if conState == ContainerStateRunning {
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stats.PIDs = cgroupStats.Pids.Current
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}
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stats.BlockInput, stats.BlockOutput = calculateBlockIO(cgroupStats)
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stats.CPUNano = cgroupStats.CPU.Usage.Total
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stats.SystemNano = cgroupStats.CPU.Usage.Kernel
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// Handle case where the container is not in a network namespace
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if netStats != nil {
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stats.NetInput = netStats.TxBytes
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stats.NetOutput = netStats.RxBytes
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} else {
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stats.NetInput = 0
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stats.NetOutput = 0
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}
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return stats, nil
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}
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// getMemory limit returns the memory limit for a given cgroup
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// If the configured memory limit is larger than the total memory on the sys, the
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// physical system memory size is returned
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func getMemLimit(cgroupLimit uint64) uint64 {
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si := &syscall.Sysinfo_t{}
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err := syscall.Sysinfo(si)
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if err != nil {
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return cgroupLimit
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}
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physicalLimit := uint64(si.Totalram)
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if cgroupLimit > physicalLimit {
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return physicalLimit
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}
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return cgroupLimit
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}
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func calculateCPUPercent(stats *cgroups.Metrics, previousCPU, previousSystem uint64) float64 {
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var (
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cpuPercent = 0.0
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cpuDelta = float64(stats.CPU.Usage.Total - previousCPU)
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systemDelta = float64(uint64(time.Now().UnixNano()) - previousSystem)
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)
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if systemDelta > 0.0 && cpuDelta > 0.0 {
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// gets a ratio of container cpu usage total, multiplies it by the number of cores (4 cores running
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// at 100% utilization should be 400% utilization), and multiplies that by 100 to get a percentage
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cpuPercent = (cpuDelta / systemDelta) * float64(len(stats.CPU.Usage.PerCPU)) * 100
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}
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return cpuPercent
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}
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func calculateBlockIO(stats *cgroups.Metrics) (read uint64, write uint64) {
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for _, blkIOEntry := range stats.Blkio.IoServiceBytesRecursive {
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switch strings.ToLower(blkIOEntry.Op) {
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case "read":
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read += blkIOEntry.Value
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case "write":
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write += blkIOEntry.Value
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}
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}
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return
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}
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