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// +build linux
package libpod
import (
"strings"
"syscall"
"time"
"github.com/containers/libpod/libpod/define"
"github.com/containers/libpod/pkg/cgroups"
"github.com/pkg/errors"
)
// GetContainerStats gets the running stats for a given container
func (c *Container) GetContainerStats(previousStats *ContainerStats) (*ContainerStats, error) {
stats := new(ContainerStats)
stats.ContainerID = c.ID()
stats.Name = c.Name()
if c.config.NoCgroups {
return nil, errors.Wrapf(define.ErrNoCgroups, "cannot run top on container %s as it did not create a cgroup", c.ID())
}
if !c.batched {
c.lock.Lock()
defer c.lock.Unlock()
if err := c.syncContainer(); err != nil {
return stats, err
}
}
if c.state.State != define.ContainerStateRunning {
return stats, define.ErrCtrStateInvalid
}
cgroupPath, err := c.CGroupPath()
if err != nil {
return nil, err
}
cgroup, err := cgroups.Load(cgroupPath)
if err != nil {
return stats, errors.Wrapf(err, "unable to load cgroup at %s", cgroupPath)
}
// Ubuntu does not have swap memory in cgroups because swap is often not enabled.
cgroupStats, err := cgroup.Stat()
if err != nil {
return stats, errors.Wrapf(err, "unable to obtain cgroup stats")
}
conState := c.state.State
netStats, err := getContainerNetIO(c)
if err != nil {
return nil, err
}
previousCPU := previousStats.CPUNano
now := uint64(time.Now().UnixNano())
stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, now, previousStats.SystemNano)
stats.MemUsage = cgroupStats.Memory.Usage.Usage
stats.MemLimit = getMemLimit(cgroupStats.Memory.Usage.Limit)
stats.MemPerc = (float64(stats.MemUsage) / float64(stats.MemLimit)) * 100
stats.PIDs = 0
if conState == define.ContainerStateRunning {
stats.PIDs = cgroupStats.Pids.Current
}
stats.BlockInput, stats.BlockOutput = calculateBlockIO(cgroupStats)
stats.CPUNano = cgroupStats.CPU.Usage.Total
stats.SystemNano = now
// 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 given cgroup
// If the configured memory limit is larger than the total memory on the sys, the
// physical system memory size is returned
func getMemLimit(cgroupLimit uint64) uint64 {
si := &syscall.Sysinfo_t{}
err := syscall.Sysinfo(si)
if err != nil {
return cgroupLimit
}
//nolint:unconvert
physicalLimit := uint64(si.Totalram)
if cgroupLimit > physicalLimit {
return physicalLimit
}
return cgroupLimit
}
// 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 (
cpuPercent = 0.0
cpuDelta = float64(stats.CPU.Usage.Total - 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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