mirror of
https://github.com/containers/podman
synced 2024-10-19 16:54:07 +00:00
130bcc3a93
We can just calculate the cpu percent for the time the container is running. There is no need to use datapoints. Signed-off-by: Paul Holzinger <pholzing@redhat.com>
159 lines
4.9 KiB
Go
159 lines
4.9 KiB
Go
//go:build linux
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// +build linux
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package libpod
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import (
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"math"
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"strings"
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"syscall"
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"time"
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"github.com/containers/common/pkg/cgroups"
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"github.com/containers/podman/v4/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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// The previousStats is used to correctly calculate cpu percentages. You
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// should pass nil if there is no previous stat for this container.
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func (c *Container) GetContainerStats(previousStats *define.ContainerStats) (*define.ContainerStats, error) {
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stats := new(define.ContainerStats)
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stats.ContainerID = c.ID()
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stats.Name = c.Name()
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if c.config.NoCgroups {
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return nil, errors.Wrapf(define.ErrNoCgroups, "cannot run top on container %s as it did not create a cgroup", c.ID())
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}
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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 != define.ContainerStateRunning && c.state.State != define.ContainerStatePaused {
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return stats, define.ErrCtrStateInvalid
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}
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if previousStats == nil {
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previousStats = &define.ContainerStats{
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// if we have no prev stats use the container start time as prev time
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// otherwise we cannot correctly calculate the CPU percentage
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SystemNano: uint64(c.state.StartedTime.UnixNano()),
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}
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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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cgroup, err := cgroups.Load(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()
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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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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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// If the current total usage in the cgroup is less than what was previously
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// recorded then it means the container was restarted and runs in a new cgroup
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if previousStats.Duration > cgroupStats.CPU.Usage.Total {
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previousStats = &define.ContainerStats{}
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}
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previousCPU := previousStats.CPUNano
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now := uint64(time.Now().UnixNano())
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stats.Duration = cgroupStats.CPU.Usage.Total
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stats.UpTime = time.Duration(stats.Duration)
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stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, now, previousStats.SystemNano)
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// calc the average cpu usage for the time the container is running
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stats.AvgCPU = calculateCPUPercent(cgroupStats, 0, now, uint64(c.state.StartedTime.UnixNano()))
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stats.MemUsage = cgroupStats.Memory.Usage.Usage
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stats.MemLimit = c.getMemLimit()
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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 == define.ContainerStateRunning || conState == define.ContainerStatePaused {
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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.CPUSystemNano = cgroupStats.CPU.Usage.Kernel
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stats.SystemNano = now
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stats.PerCPU = cgroupStats.CPU.Usage.PerCPU
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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 container
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func (c *Container) getMemLimit() uint64 {
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memLimit := uint64(math.MaxUint64)
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if c.config.Spec.Linux != nil && c.config.Spec.Linux.Resources != nil &&
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c.config.Spec.Linux.Resources.Memory != nil && c.config.Spec.Linux.Resources.Memory.Limit != nil {
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memLimit = uint64(*c.config.Spec.Linux.Resources.Memory.Limit)
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}
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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 memLimit
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}
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//nolint:unconvert
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physicalLimit := uint64(si.Totalram)
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if memLimit <= 0 || memLimit > physicalLimit {
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return physicalLimit
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}
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return memLimit
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}
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// calculateCPUPercent calculates the cpu usage using the latest measurement in stats.
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// previousCPU is the last value of stats.CPU.Usage.Total measured at the time previousSystem.
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// (now - previousSystem) is the time delta in nanoseconds, between the measurement in previousCPU
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// and the updated value in stats.
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func calculateCPUPercent(stats *cgroups.Metrics, previousCPU, now, 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(now - 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, and multiplies that by 100 to get a percentage
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cpuPercent = (cpuDelta / systemDelta) * 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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