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//go:build linux
// +build linux
package libpod
import (
"fmt"
"math"
"strings"
"syscall"
"time"
runccgroup "github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/containers/common/pkg/cgroups"
"github.com/containers/podman/v4/libpod/define"
)
// GetContainerStats gets the running stats for a given container.
// The previousStats is used to correctly calculate cpu percentages. You
// should pass nil if there is no previous stat for this container.
func (c *Container) GetContainerStats(previousStats *define.ContainerStats) (*define.ContainerStats, error) {
stats := new(define.ContainerStats)
stats.ContainerID = c.ID()
stats.Name = c.Name()
if c.config.NoCgroups {
return nil, fmt.Errorf("cannot run top on container %s as it did not create a cgroup: %w", c.ID(), define.ErrNoCgroups)
}
if !c.batched {
c.lock.Lock()
defer c.lock.Unlock()
if err := c.syncContainer(); err != nil {
return stats, err
}
}
// returns stats with the fields' default values respective of their type
if c.state.State != define.ContainerStateRunning && c.state.State != define.ContainerStatePaused {
return stats, nil
}
if previousStats == nil {
previousStats = &define.ContainerStats{
// if we have no prev stats use the container start time as prev time
// otherwise we cannot correctly calculate the CPU percentage
SystemNano: uint64(c.state.StartedTime.UnixNano()),
}
}
cgroupPath, err := c.cGroupPath()
if err != nil {
return nil, err
}
cgroup, err := cgroups.Load(cgroupPath)
if err != nil {
return stats, fmt.Errorf("unable to load cgroup at %s: %w", cgroupPath, err)
}
// Ubuntu does not have swap memory in cgroups because swap is often not enabled.
cgroupStats, err := cgroup.Stat()
if err != nil {
return stats, fmt.Errorf("unable to obtain cgroup stats: %w", err)
}
conState := c.state.State
netStats, err := getContainerNetIO(c)
if err != nil {
return nil, err
}
// If the current total usage in the cgroup is less than what was previously
// recorded then it means the container was restarted and runs in a new cgroup
if previousStats.Duration > cgroupStats.CpuStats.CpuUsage.TotalUsage {
previousStats = &define.ContainerStats{}
}
previousCPU := previousStats.CPUNano
now := uint64(time.Now().UnixNano())
stats.Duration = cgroupStats.CpuStats.CpuUsage.TotalUsage
stats.UpTime = time.Duration(stats.Duration)
stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, now, previousStats.SystemNano)
// calc the average cpu usage for the time the container is running
stats.AvgCPU = calculateCPUPercent(cgroupStats, 0, now, uint64(c.state.StartedTime.UnixNano()))
stats.MemUsage = cgroupStats.MemoryStats.Usage.Usage
stats.MemLimit = c.getMemLimit()
stats.MemPerc = (float64(stats.MemUsage) / float64(stats.MemLimit)) * 100
stats.PIDs = 0
if conState == define.ContainerStateRunning || conState == define.ContainerStatePaused {
stats.PIDs = cgroupStats.PidsStats.Current
}
stats.BlockInput, stats.BlockOutput = calculateBlockIO(cgroupStats)
stats.CPUNano = cgroupStats.CpuStats.CpuUsage.TotalUsage
stats.CPUSystemNano = cgroupStats.CpuStats.CpuUsage.UsageInKernelmode
stats.SystemNano = now
stats.PerCPU = cgroupStats.CpuStats.CpuUsage.PercpuUsage
// Handle case where the container is not in a network namespace
if netStats != nil {
stats.NetInput = netStats.TxBytes
stats.NetOutput = netStats.RxBytes
} else {
stats.NetInput = 0
stats.NetOutput = 0
}
return stats, nil
}
// getMemory limit returns the memory limit for a container
func (c *Container) getMemLimit() uint64 {
memLimit := uint64(math.MaxUint64)
if c.config.Spec.Linux != nil && c.config.Spec.Linux.Resources != nil &&
c.config.Spec.Linux.Resources.Memory != nil && c.config.Spec.Linux.Resources.Memory.Limit != nil {
memLimit = uint64(*c.config.Spec.Linux.Resources.Memory.Limit)
}
si := &syscall.Sysinfo_t{}
err := syscall.Sysinfo(si)
if err != nil {
return memLimit
}
//nolint:unconvert
physicalLimit := uint64(si.Totalram)
if memLimit <= 0 || memLimit > physicalLimit {
return physicalLimit
}
return memLimit
}
// calculateCPUPercent calculates the cpu usage using the latest measurement in stats.
// previousCPU is the last value of stats.CPU.Usage.Total measured at the time previousSystem.
// (now - previousSystem) is the time delta in nanoseconds, between the measurement in previousCPU
// and the updated value in stats.
func calculateCPUPercent(stats *runccgroup.Stats, previousCPU, now, previousSystem uint64) float64 {
var (
cpuPercent = 0.0
cpuDelta = float64(stats.CpuStats.CpuUsage.TotalUsage - previousCPU)
systemDelta = float64(now - previousSystem)
)
if systemDelta > 0.0 && cpuDelta > 0.0 {
// gets a ratio of container cpu usage total, and multiplies that by 100 to get a percentage
cpuPercent = (cpuDelta / systemDelta) * 100
}
return cpuPercent
}
func calculateBlockIO(stats *runccgroup.Stats) (read uint64, write uint64) {
for _, blkIOEntry := range stats.BlkioStats.IoServiceBytesRecursive {
switch strings.ToLower(blkIOEntry.Op) {
case "read":
read += blkIOEntry.Value
case "write":
write += blkIOEntry.Value
}
}
return
}
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