Function parseContentionSample

profile/legacy_profile.go:804–837

parseContentionSample parses a single row from a contention profile into a new Sample.

(line string, period, cpuHz int64)

// parseContentionSample parses a single row from a contention profile
// into a new Sample.
func parseContentionSample(line string, period, cpuHz int64) (value []int64, addrs []uint64, err error) {
	sampleData := contentionSampleRE.FindStringSubmatch(line)
	if sampleData == nil {
		return nil, nil, errUnrecognized
	}

	v1, err := strconv.ParseInt(sampleData[1], 10, 64)
	if err != nil {
		return nil, nil, fmt.Errorf("malformed sample: %s: %v", line, err)
	}
	v2, err := strconv.ParseInt(sampleData[2], 10, 64)
	if err != nil {
		return nil, nil, fmt.Errorf("malformed sample: %s: %v", line, err)
	}

	// Unsample values if period and cpuHz are available.
	// - Delays are scaled to cycles and then to nanoseconds.
	// - Contentions are scaled to cycles.
	if period > 0 {
		if cpuHz > 0 {
			cpuGHz := float64(cpuHz) / 1e9
			v1 = int64(float64(v1) * float64(period) / cpuGHz)
		}
		v2 = v2 * period
	}

	value = []int64{v2, v1}
	addrs, err = parseHexAddresses(sampleData[3])
	if err != nil {
		return nil, nil, fmt.Errorf("malformed sample: %s: %v", line, err)
	}

	return value, addrs, nil
}

// parseThread parses a Threadz profile and returns a new Profile.
func parseThread(b []byte) (*Profile, error) {