/
driver_qemu_metrics.go
224 lines (178 loc) · 5.59 KB
/
driver_qemu_metrics.go
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package drivers
import (
"bufio"
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/lxc/incus/v6/internal/server/instance/drivers/qmp"
"github.com/lxc/incus/v6/internal/server/instance/instancetype"
"github.com/lxc/incus/v6/internal/server/metrics"
"github.com/lxc/incus/v6/shared/logger"
"github.com/lxc/incus/v6/shared/units"
"github.com/lxc/incus/v6/shared/util"
)
func (d *qemu) getQemuMetrics() (*metrics.MetricSet, error) {
// Connect to the monitor.
monitor, err := qmp.Connect(d.monitorPath(), qemuSerialChardevName, d.getMonitorEventHandler())
if err != nil {
return nil, err
}
out := metrics.Metrics{}
cpuStats, err := d.getQemuCPUMetrics(monitor)
if err != nil {
d.logger.Warn("Failed to get CPU metrics", logger.Ctx{"err": err})
} else {
out.CPU = cpuStats
}
memoryStats, err := d.getQemuMemoryMetrics(monitor)
if err != nil {
d.logger.Warn("Failed to get memory metrics", logger.Ctx{"err": err})
} else {
out.Memory = memoryStats
}
diskStats, err := d.getQemuDiskMetrics(monitor)
if err != nil {
d.logger.Warn("Failed to get disk metrics", logger.Ctx{"err": err})
} else {
out.Disk = diskStats
}
networkState, err := d.getNetworkState()
if err != nil {
d.logger.Warn("Failed to get network metrics", logger.Ctx{"err": err})
} else {
out.Network = make([]metrics.NetworkMetrics, 0, len(networkState))
for name, state := range networkState {
out.Network = append(out.Network, metrics.NetworkMetrics{
Device: name,
ReceiveBytes: uint64(state.Counters.BytesReceived),
ReceiveDrop: uint64(state.Counters.PacketsDroppedInbound),
ReceiveErrors: uint64(state.Counters.ErrorsReceived),
ReceivePackets: uint64(state.Counters.PacketsReceived),
TransmitBytes: uint64(state.Counters.BytesSent),
TransmitDrop: uint64(state.Counters.PacketsDroppedOutbound),
TransmitErrors: uint64(state.Counters.ErrorsSent),
TransmitPackets: uint64(state.Counters.PacketsSent),
})
}
}
metricSet, err := metrics.MetricSetFromAPI(&out, map[string]string{"project": d.project.Name, "name": d.name, "type": instancetype.VM.String()})
if err != nil {
return nil, err
}
return metricSet, nil
}
func (d *qemu) getQemuDiskMetrics(monitor *qmp.Monitor) ([]metrics.DiskMetrics, error) {
stats, err := monitor.GetBlockStats()
if err != nil {
return nil, err
}
out := make([]metrics.DiskMetrics, 0, len(stats))
for dev, stat := range stats {
out = append(out, metrics.DiskMetrics{
Device: dev,
ReadBytes: uint64(stat.BytesRead),
ReadsCompleted: uint64(stat.ReadsCompleted),
WrittenBytes: uint64(stat.BytesWritten),
WritesCompleted: uint64(stat.WritesCompleted),
})
}
return out, nil
}
func (d *qemu) getQemuMemoryMetrics(monitor *qmp.Monitor) (metrics.MemoryMetrics, error) {
out := metrics.MemoryMetrics{}
// Get the QEMU PID.
pid, err := d.pid()
if err != nil {
return out, err
}
// Extract current QEMU RSS.
f, err := os.Open(fmt.Sprintf("/proc/%d/status", pid))
if err != nil {
return out, err
}
defer func() { _ = f.Close() }()
// Read it line by line.
memRSS := int64(-1)
scan := bufio.NewScanner(f)
for scan.Scan() {
line := scan.Text()
// We only care about VmRSS.
if !strings.HasPrefix(line, "VmRSS:") {
continue
}
// Extract the before last (value) and last (unit) fields
fields := strings.Split(line, "\t")
value := strings.Replace(fields[len(fields)-1], " ", "", -1)
// Feed the result to units.ParseByteSizeString to get an int value
valueBytes, err := units.ParseByteSizeString(value)
if err != nil {
return out, err
}
memRSS = valueBytes
break
}
if memRSS == -1 {
return out, fmt.Errorf("Couldn't find VM memory usage")
}
// Get max memory usage.
memTotal := d.expandedConfig["limits.memory"]
if memTotal == "" {
memTotal = QEMUDefaultMemSize // Default if no memory limit specified.
}
memTotalBytes, err := units.ParseByteSizeString(memTotal)
if err != nil {
return out, err
}
// Prepare struct.
out = metrics.MemoryMetrics{
MemAvailableBytes: uint64(memTotalBytes - memRSS),
MemFreeBytes: uint64(memTotalBytes - memRSS),
MemTotalBytes: uint64(memTotalBytes),
}
return out, nil
}
func (d *qemu) getQemuCPUMetrics(monitor *qmp.Monitor) ([]metrics.CPUMetrics, error) {
// Get CPU metrics
threadIDs, err := monitor.GetCPUs()
if err != nil {
return nil, err
}
cpuMetrics := make([]metrics.CPUMetrics, 0, len(threadIDs))
for i, threadID := range threadIDs {
pid, err := os.ReadFile(d.pidFilePath())
if err != nil {
return nil, err
}
statFile := filepath.Join("/proc", strings.TrimSpace(string(pid)), "task", strconv.Itoa(threadID), "stat")
if !util.PathExists(statFile) {
continue
}
content, err := os.ReadFile(statFile)
if err != nil {
return nil, err
}
fields := strings.Fields(string(content))
stats := metrics.CPUMetrics{}
stats.SecondsUser, err = strconv.ParseFloat(fields[13], 64)
if err != nil {
return nil, fmt.Errorf("Failed to parse %q: %w", fields[13], err)
}
guestTime, err := strconv.ParseFloat(fields[42], 64)
if err != nil {
return nil, fmt.Errorf("Failed to parse %q: %w", fields[42], err)
}
// According to proc(5), utime includes guest_time which therefore needs to be subtracted to get the correct time.
stats.SecondsUser -= guestTime
stats.SecondsUser /= 100
stats.SecondsSystem, err = strconv.ParseFloat(fields[14], 64)
if err != nil {
return nil, fmt.Errorf("Failed to parse %q: %w", fields[14], err)
}
stats.SecondsSystem /= 100
stats.CPU = fmt.Sprintf("cpu%d", i)
cpuMetrics = append(cpuMetrics, stats)
}
return cpuMetrics, nil
}