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Correctly cast Darwin memory info (#1060)

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* Correctly cast Darwin memory info

* Cast stats to float64 before doing math on them to avoid integer
wrapping.
* Remove invalid `_total` suffix from gauge values.
* Handle counters in `meminfo.go`.

Signed-off-by: Ben Kochie <superq@gmail.com>
This commit is contained in:
Ben Kochie 2018-09-07 22:27:52 +02:00 • committed by GitHub
commit ebdd524123
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 21 additions and 10 deletions
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9
collector/meminfo.go
View file

@ -18,6 +18,7 @@ package collector
import (
"fmt"
"strings"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
@ -41,19 +42,25 @@ func NewMeminfoCollector() (Collector, error) {
// Update calls (*meminfoCollector).getMemInfo to get the platform specific
// memory metrics.
func (c *meminfoCollector) Update(ch chan<- prometheus.Metric) error {
var metricType prometheus.ValueType
memInfo, err := c.getMemInfo()
if err != nil {
return fmt.Errorf("couldn't get meminfo: %s", err)
}
log.Debugf("Set node_mem: %#v", memInfo)
for k, v := range memInfo {
if strings.HasSuffix(k, "_total") {
metricType = prometheus.CounterValue
} else {
metricType = prometheus.GaugeValue
}
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, memInfoSubsystem, k),
fmt.Sprintf("Memory information field %s.", k),
nil, nil,
),
prometheus.GaugeValue, v,
metricType, v,
)
}
return nil

16
collector/meminfo_darwin.go
View file

@ -46,14 +46,14 @@ func (c *meminfoCollector) getMemInfo() (map[string]float64, error) {
// Syscall removes terminating NUL which we need to cast to uint64
total := binary.LittleEndian.Uint64([]byte(totalb + "\x00"))
ps := C.natural_t(syscall.Getpagesize())
ps := float64(C.natural_t(syscall.Getpagesize()))
return map[string]float64{
"active_bytes_total": float64(ps * vmstat.active_count),
"inactive_bytes_total": float64(ps * vmstat.inactive_count),
"wired_bytes_total": float64(ps * vmstat.wire_count),
"free_bytes_total": float64(ps * vmstat.free_count),
"swapped_in_pages_total": float64(ps * vmstat.pageins),
"swapped_out_pages_total": float64(ps * vmstat.pageouts),
"bytes_total": float64(total),
"active_bytes": ps * float64(vmstat.active_count),
"inactive_bytes": ps * float64(vmstat.inactive_count),
"wired_bytes": ps * float64(vmstat.wire_count),
"free_bytes": ps * float64(vmstat.free_count),
"swapped_in_bytes_total": ps * float64(vmstat.pageins),
"swapped_out_bytes_total": ps * float64(vmstat.pageouts),
"total_bytes": float64(total),
}, nil
}