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[v1.6.4-rhel] stats: report correctly CPU usage

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[NO NEW TESTS NEEDED}

Backport of #4423 to the v1.6.4-rhel branch so that it
can be included into RHEL 8.2

This fixes the was that CPU is reported from the
`podman stats` command.  This fix was first put into
 podman v1.7.0

Addresses https://bugzilla.redhat.com/show_bug.cgi?id=2060095

Signed-off-by: tomsweeneyredhat <tsweeney@redhat.com>
This commit is contained in:
tomsweeneyredhat
2022-03-02 18:11:51 -05:00
parent 6150eb17cc
commit ec04a9a8ad
2 changed files with 13 additions and 15 deletions
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24
libpod/stats.go
View File

@ -3,7 +3,6 @@
package libpod package libpod
import ( import (
"runtime"
"strings" "strings"
"syscall" "syscall"
"time" "time"
@ -56,8 +55,8 @@ func (c *Container) GetContainerStats(previousStats *ContainerStats) (*Container
} }
previousCPU := previousStats.CPUNano previousCPU := previousStats.CPUNano
previousSystem := previousStats.SystemNano now := uint64(time.Now().UnixNano())
stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, previousSystem) stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, now, previousStats.SystemNano)
stats.MemUsage = cgroupStats.Memory.Usage.Usage stats.MemUsage = cgroupStats.Memory.Usage.Usage
stats.MemLimit = getMemLimit(cgroupStats.Memory.Usage.Limit) stats.MemLimit = getMemLimit(cgroupStats.Memory.Usage.Limit)
stats.MemPerc = (float64(stats.MemUsage) / float64(stats.MemLimit)) * 100 stats.MemPerc = (float64(stats.MemUsage) / float64(stats.MemLimit)) * 100
@ -67,7 +66,7 @@ func (c *Container) GetContainerStats(previousStats *ContainerStats) (*Container
} }
stats.BlockInput, stats.BlockOutput = calculateBlockIO(cgroupStats) stats.BlockInput, stats.BlockOutput = calculateBlockIO(cgroupStats)
stats.CPUNano = cgroupStats.CPU.Usage.Total stats.CPUNano = cgroupStats.CPU.Usage.Total
stats.SystemNano = cgroupStats.CPU.Usage.Kernel stats.SystemNano = now
// Handle case where the container is not in a network namespace // Handle case where the container is not in a network namespace
if netStats != nil { if netStats != nil {
stats.NetInput = netStats.TxBytes stats.NetInput = netStats.TxBytes
@ -98,20 +97,19 @@ func getMemLimit(cgroupLimit uint64) uint64 {
return cgroupLimit return cgroupLimit
} }
func calculateCPUPercent(stats *cgroups.Metrics, previousCPU, previousSystem uint64) float64 { // 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 *cgroups.Metrics, previousCPU, now, previousSystem uint64) float64 {
var ( var (
cpuPercent = 0.0 cpuPercent = 0.0
cpuDelta = float64(stats.CPU.Usage.Total - previousCPU) cpuDelta = float64(stats.CPU.Usage.Total - previousCPU)
systemDelta = float64(uint64(time.Now().UnixNano()) - previousSystem) systemDelta = float64(now - previousSystem)
) )
if systemDelta > 0.0 && cpuDelta > 0.0 { if systemDelta > 0.0 && cpuDelta > 0.0 {
// gets a ratio of container cpu usage total, multiplies it by the number of cores (4 cores running // gets a ratio of container cpu usage total, and multiplies that by 100 to get a percentage
// at 100% utilization should be 400% utilization), and multiplies that by 100 to get a percentage cpuPercent = (cpuDelta / systemDelta) * 100
nCPUS := len(stats.CPU.Usage.PerCPU)
if nCPUS == 0 {
nCPUS = runtime.NumCPU()
}
cpuPercent = (cpuDelta / systemDelta) * float64(nCPUS) * 100
} }
return cpuPercent return cpuPercent
} }

4
pkg/cgroups/cpu.go
View File

@ -81,14 +81,14 @@ func (c *cpuHandler) Stat(ctr *CgroupControl, m *Metrics) error {
return err return err
} }
if val, found := values["usage_usec"]; found { if val, found := values["usage_usec"]; found {
usage.Kernel, err = strconv.ParseUint(cleanString(val[0]), 10, 0) usage.Total, err = strconv.ParseUint(cleanString(val[0]), 10, 0)
if err != nil { if err != nil {
return err return err
} }
usage.Kernel *= 1000 usage.Kernel *= 1000
} }
if val, found := values["system_usec"]; found { if val, found := values["system_usec"]; found {
usage.Total, err = strconv.ParseUint(cleanString(val[0]), 10, 0) usage.Kernel, err = strconv.ParseUint(cleanString(val[0]), 10, 0)
if err != nil { if err != nil {
return err return err
} }