remove cgo dependency
by hardcoding `USER_HZ` (aka. `_SC_CLK_TCK`) to 100, which it is for all platforms Go supports. See prometheus/node_exporter#52 for discussion around this too. Closes prometheus/node_exporter#52.
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@ -11,11 +11,9 @@ import (
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"github.com/prometheus/client_golang/prometheus"
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)
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// #include <unistd.h>
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import "C"
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const (
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procStat = "/proc/stat"
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userHz = 100
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)
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type statCollector struct {
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@ -102,17 +100,17 @@ func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
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// Only some of these may be present, depending on kernel version.
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cpuFields := []string{"user", "nice", "system", "idle", "iowait", "irq", "softirq", "steal", "guest"}
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// OpenVZ guests lack the "guest" CPU field, which needs to be ignored.
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expectedFieldNum := len(cpuFields)+1
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expectedFieldNum := len(cpuFields) + 1
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if expectedFieldNum > len(parts) {
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expectedFieldNum = len(parts)
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}
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for i, v := range parts[1 : expectedFieldNum] {
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for i, v := range parts[1:expectedFieldNum] {
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value, err := strconv.ParseFloat(v, 64)
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if err != nil {
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return err
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}
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// Convert from ticks to seconds
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value /= float64(C.sysconf(C._SC_CLK_TCK))
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value /= userHz
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c.cpu.With(prometheus.Labels{"cpu": parts[0], "mode": cpuFields[i]}).Set(value)
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}
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case parts[0] == "intr":
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