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CPUInfo for ARM and Linux kernels newer than 3.8 #294

@bluecmd

Description

@bluecmd

From #291 it was concluded that the current parsing code is limited to kernels older than 3.8.

Problematic code is:

procfs/cpuinfo.go

Lines 189 to 233 in 7a44272

func parseCPUInfoARM(info []byte) ([]CPUInfo, error) {
scanner := bufio.NewScanner(bytes.NewReader(info))
firstLine := firstNonEmptyLine(scanner)
if !strings.HasPrefix(firstLine, "Processor") || !strings.Contains(firstLine, ":") {
return nil, errors.New("invalid cpuinfo file: " + firstLine)
}
field := strings.SplitN(firstLine, ": ", 2)
commonCPUInfo := CPUInfo{VendorID: field[1]}
cpuinfo := []CPUInfo{}
i := -1
featuresLine := ""
for scanner.Scan() {
line := scanner.Text()
if !strings.Contains(line, ":") {
continue
}
field := strings.SplitN(line, ": ", 2)
switch strings.TrimSpace(field[0]) {
case "processor":
cpuinfo = append(cpuinfo, commonCPUInfo) // start of the next processor
i++
v, err := strconv.ParseUint(field[1], 0, 32)
if err != nil {
return nil, err
}
cpuinfo[i].Processor = uint(v)
case "BogoMIPS":
v, err := strconv.ParseFloat(field[1], 64)
if err != nil {
return nil, err
}
cpuinfo[i].BogoMips = v
case "Features":
featuresLine = line
}
}
fields := strings.SplitN(featuresLine, ": ", 2)
for i := range cpuinfo {
cpuinfo[i].Flags = strings.Fields(fields[1])
}
return cpuinfo, nil
}

This code should be changed to either drop support for older kernels, or be capable of parsing both new and old kernels alike - probably with reduced functionality for the older ones.

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