func getCPUStats(domain *libvirtgo.VirDomain) (types.CpuStats, error) {
stats := types.CpuStats{
Usage: types.CpuUsage{
PerCpu: make([]uint64, 0, 1),
},
}
// Get the number of cpus available to query from the host perspective,
ncpus, err := domain.GetCPUStats(nil, 0, 0, 0, 0)
if err != nil {
return stats, err
}
// Get how many statistics are available for the given @start_cpu.
nparams, err := domain.GetCPUStats(nil, 0, 0, 1, 0)
if err != nil {
return stats, err
}
// Query per-cpu stats
var perCPUStats libvirtgo.VirTypedParameters
_, err = domain.GetCPUStats(&perCPUStats, nparams, 0, uint32(ncpus), 0)
if err != nil {
return stats, err
}
if len(perCPUStats) == 0 {
return stats, fmt.Errorf("Can't get per-cpu stats")
}
for _, stat := range perCPUStats {
stats.Usage.PerCpu = append(stats.Usage.PerCpu, stat.Value.(uint64))
}
glog.V(4).Infof("Get per-cpu stats: %v", perCPUStats)
// Query total stats
var cpuStats libvirtgo.VirTypedParameters
nparams, err = domain.GetCPUStats(nil, 0, -1, 1, 0)
if err != nil {
return stats, err
}
_, err = domain.GetCPUStats(&cpuStats, nparams, -1, 1, 0)
if err != nil {
return stats, err
}
for _, stat := range cpuStats {
switch stat.Name {
case VIR_DOMAIN_CPU_STATS_CPUTIME:
stats.Usage.Total = stat.Value.(uint64)
case VIR_DOMAIN_CPU_STATS_USERTIME:
stats.Usage.User = stat.Value.(uint64)
case VIR_DOMAIN_CPU_STATS_SYSTEMTIME:
stats.Usage.System = stat.Value.(uint64)
}
}
glog.V(4).Infof("Get total cpu stats: %v", cpuStats)
return stats, nil
}