113 lines
3.1 KiB
Go
113 lines
3.1 KiB
Go
// +build linux
|
|
|
|
package libpod
|
|
|
|
import (
|
|
"strings"
|
|
"syscall"
|
|
"time"
|
|
|
|
"github.com/containerd/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()
|
|
c.lock.Lock()
|
|
defer c.lock.Unlock()
|
|
if err := c.syncContainer(); err != nil {
|
|
return stats, err
|
|
}
|
|
if c.state.State != ContainerStateRunning {
|
|
return stats, nil
|
|
}
|
|
|
|
cgroupPath, err := c.CGroupPath()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
cgroup, err := cgroups.Load(cgroups.V1, cgroups.StaticPath(cgroupPath))
|
|
if err != nil {
|
|
return stats, errors.Wrapf(err, "unable to load cgroup at %s", cgroupPath)
|
|
}
|
|
|
|
cgroupStats, err := cgroup.Stat()
|
|
if err != nil {
|
|
return stats, errors.Wrapf(err, "unable to obtain cgroup stats")
|
|
}
|
|
conState := c.state.State
|
|
if err != nil {
|
|
return stats, errors.Wrapf(err, "unable to determine container state")
|
|
}
|
|
|
|
netStats, err := getContainerNetIO(c)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
previousCPU := previousStats.CPUNano
|
|
previousSystem := previousStats.SystemNano
|
|
stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, previousSystem)
|
|
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 == ContainerStateRunning {
|
|
stats.PIDs = cgroupStats.Pids.Current
|
|
}
|
|
stats.BlockInput, stats.BlockOutput = calculateBlockIO(cgroupStats)
|
|
stats.CPUNano = cgroupStats.CPU.Usage.Total
|
|
stats.SystemNano = cgroupStats.CPU.Usage.Kernel
|
|
stats.NetInput = netStats.TxBytes
|
|
stats.NetOutput = netStats.RxBytes
|
|
|
|
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
|
|
}
|
|
|
|
physicalLimit := uint64(si.Totalram)
|
|
if cgroupLimit > physicalLimit {
|
|
return physicalLimit
|
|
}
|
|
return cgroupLimit
|
|
}
|
|
|
|
func calculateCPUPercent(stats *cgroups.Metrics, previousCPU, previousSystem uint64) float64 {
|
|
var (
|
|
cpuPercent = 0.0
|
|
cpuDelta = float64(stats.CPU.Usage.Total - previousCPU)
|
|
systemDelta = float64(uint64(time.Now().UnixNano()) - previousSystem)
|
|
)
|
|
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
|
|
// at 100% utilization should be 400% utilization), and multiplies that by 100 to get a percentage
|
|
cpuPercent = (cpuDelta / systemDelta) * float64(len(stats.CPU.Usage.PerCPU)) * 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
|
|
}
|