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package libpod
import (
"fmt"
"math"
"strings"
"time"
"github.com/containers/common/pkg/cgroups"
"github.com/containers/podman/v4/libpod/define"
"github.com/containers/podman/v4/pkg/rctl"
"github.com/containers/storage/pkg/system"
"github.com/sirupsen/logrus"
)
// getPlatformContainerStats gets the platform-specific 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) getPlatformContainerStats(stats *define.ContainerStats, previousStats *define.ContainerStats) error {
now := uint64(time.Now().UnixNano())
jailName := c.ID()
if c.state.NetNS != nil {
jailName = c.state.NetNS.Name + "." + jailName
}
entries, err := rctl.GetRacct("jail:" + jailName)
if err != nil {
return fmt.Errorf("unable to read accounting for %s: %w", jailName, err)
}
// If the current total usage is less than what was previously
// recorded then it means the container was restarted and runs
// in a new jail
if dur, ok := entries["wallclock"]; ok {
if previousStats.Duration > dur*1000000000 {
previousStats = &define.ContainerStats{}
}
}
for key, val := range entries {
switch key {
case "cputime": // CPU time, in seconds
stats.CPUNano = val * 1000000000
stats.AvgCPU = calculateCPUPercent(stats.CPUNano, 0, now, uint64(c.state.StartedTime.UnixNano()))
case "datasize": // data size, in bytes
case "stacksize": // stack size, in bytes
case "coredumpsize": // core dump size, in bytes
case "memoryuse": // resident set size, in bytes
stats.MemUsage = val
case "memorylocked": // locked memory, in bytes
case "maxproc": // number of processes
stats.PIDs = val
case "openfiles": // file descriptor table size
case "vmemoryuse": // address space limit, in bytes
case "pseudoterminals": // number of PTYs
case "swapuse": // swap space that may be reserved or used, in bytes
case "nthr": // number of threads
case "msgqqueued": // number of queued SysV messages
case "msgqsize": // SysV message queue size, in bytes
case "nmsgq": // number of SysV message queues
case "nsem": // number of SysV semaphores
case "nsemop": // number of SysV semaphores modified in a single semop(2) call
case "nshm": // number of SysV shared memory segments
case "shmsize": // SysV shared memory size, in bytes
case "wallclock": // wallclock time, in seconds
stats.Duration = val * 1000000000
stats.UpTime = time.Duration(stats.Duration)
case "pcpu": // %CPU, in percents of a single CPU core
stats.CPU = float64(val)
case "readbps": // filesystem reads, in bytes per second
stats.BlockInput = val
case "writebps": // filesystem writes, in bytes per second
stats.BlockOutput = val
case "readiops": // filesystem reads, in operations per second
case "writeiops": // filesystem writes, in operations per second
}
}
stats.MemLimit = c.getMemLimit()
stats.SystemNano = now
netStats, err := getContainerNetIO(c)
if err != nil {
return err
}
// 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 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)
}
mi, err := system.ReadMemInfo()
if err != nil {
logrus.Errorf("ReadMemInfo error: %v", err)
return 0
}
//nolint:unconvert
physicalLimit := uint64(mi.MemTotal)
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(currentCPU, previousCPU, now, previousSystem uint64) float64 {
var (
cpuPercent = 0.0
cpuDelta = float64(currentCPU - 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 *cgroups.Metrics) (read uint64, write uint64) {
for _, blkIOEntry := range stats.Blkio.IoServiceBytesRecursive {
switch strings.ToLower(blkIOEntry.Op) {
case "read":
read += blkIOEntry.Value
case "write":
write += blkIOEntry.Value
}
}
return
}
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