mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-03 15:31:05 +01:00
25ea90369c
Last login is disabled by default as it's broken on ubuntu 12.04 Interrupts is disabled by default as it's very granular and we'll have total interrupts from /proc/stat Allow ignoring devices from diskstats, ignore ram and loop devices by default. Use glog for logging.
102 lines
2.1 KiB
Go
102 lines
2.1 KiB
Go
// +build !nomeminfo
|
|
|
|
package collector
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/golang/glog"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
const (
|
|
procMemInfo = "/proc/meminfo"
|
|
)
|
|
|
|
var (
|
|
memInfoMetrics = map[string]prometheus.Gauge{}
|
|
)
|
|
|
|
type meminfoCollector struct {
|
|
registry prometheus.Registry
|
|
config Config
|
|
}
|
|
|
|
func init() {
|
|
Factories["meminfo"] = NewMeminfoCollector
|
|
}
|
|
|
|
// Takes a config struct and prometheus registry and returns a new Collector exposing
|
|
// memory stats.
|
|
func NewMeminfoCollector(config Config, registry prometheus.Registry) (Collector, error) {
|
|
c := meminfoCollector{
|
|
config: config,
|
|
registry: registry,
|
|
}
|
|
return &c, nil
|
|
}
|
|
|
|
func (c *meminfoCollector) Update() (updates int, err error) {
|
|
memInfo, err := getMemInfo()
|
|
if err != nil {
|
|
return updates, fmt.Errorf("Couldn't get meminfo: %s", err)
|
|
}
|
|
glog.V(1).Infof("Set node_mem: %#v", memInfo)
|
|
for k, v := range memInfo {
|
|
if _, ok := memInfoMetrics[k]; !ok {
|
|
memInfoMetrics[k] = prometheus.NewGauge()
|
|
c.registry.Register(
|
|
"node_memory_"+k,
|
|
k+" from /proc/meminfo",
|
|
prometheus.NilLabels,
|
|
memInfoMetrics[k],
|
|
)
|
|
}
|
|
updates++
|
|
memInfoMetrics[k].Set(nil, v)
|
|
}
|
|
return updates, err
|
|
}
|
|
|
|
func getMemInfo() (map[string]float64, error) {
|
|
file, err := os.Open(procMemInfo)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return parseMemInfo(file)
|
|
}
|
|
|
|
func parseMemInfo(r io.ReadCloser) (map[string]float64, error) {
|
|
defer r.Close()
|
|
memInfo := map[string]float64{}
|
|
scanner := bufio.NewScanner(r)
|
|
re := regexp.MustCompile("\\((.*)\\)")
|
|
for scanner.Scan() {
|
|
line := scanner.Text()
|
|
parts := strings.Fields(string(line))
|
|
fv, err := strconv.ParseFloat(parts[1], 64)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Invalid value in meminfo: %s", err)
|
|
}
|
|
switch len(parts) {
|
|
case 2: // no unit
|
|
case 3: // has unit, we presume kB
|
|
fv *= 1024
|
|
default:
|
|
return nil, fmt.Errorf("Invalid line in %s: %s", procMemInfo, line)
|
|
}
|
|
key := parts[0][:len(parts[0])-1] // remove trailing : from key
|
|
// Active(anon) -> Active_anon
|
|
key = re.ReplaceAllString(key, "_${1}")
|
|
memInfo[key] = fv
|
|
}
|
|
return memInfo, nil
|
|
|
|
}
|