mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-25 14:27:21 +01:00
97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
// +build !nomeminfo
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package collector
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import (
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"errors"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/log"
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)
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/*
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#include <stddef.h>
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#include <sys/sysctl.h>
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int _sysctl(const char* name) {
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int val;
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size_t size = sizeof(val);
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int res = sysctlbyname(name, &val, &size, NULL, 0);
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if (res == -1) {
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return -1;
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}
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if (size != sizeof(val)) {
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return -2;
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}
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return val;
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}
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*/
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import "C"
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const (
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memInfoSubsystem = "memory"
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)
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type meminfoCollector struct {
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metrics map[string]prometheus.Gauge
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}
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func init() {
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Factories["meminfo"] = NewMeminfoCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// Memory stats.
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func NewMeminfoCollector() (Collector, error) {
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return &meminfoCollector{
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metrics: map[string]prometheus.Gauge{},
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}, nil
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}
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func (c *meminfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
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var pages map[string]C.int
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pages = make(map[string]C.int)
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size := C._sysctl(C.CString("vm.stats.vm.v_page_size"))
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if size == -1 {
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return errors.New("sysctl(vm.stats.vm.v_page_size) failed")
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}
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if size == -2 {
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return errors.New("sysctl(vm.stats.vm.v_page_size) failed, wrong buffer size")
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}
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pages["active"] = C._sysctl(C.CString("vm.stats.vm.v_active_count"))
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pages["inactive"] = C._sysctl(C.CString("vm.stats.vm.v_inactive_count"))
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pages["wire"] = C._sysctl(C.CString("vm.stats.vm.v_wire_count"))
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pages["cache"] = C._sysctl(C.CString("vm.stats.vm.v_cache_count"))
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pages["free"] = C._sysctl(C.CString("vm.stats.vm.v_free_count"))
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pages["swappgsin"] = C._sysctl(C.CString("vm.stats.vm.v_swappgsin"))
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pages["swappgsout"] = C._sysctl(C.CString("vm.stats.vm.v_swappgsout"))
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pages["total"] = C._sysctl(C.CString("vm.stats.vm.v_page_count"))
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for key := range pages {
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if pages[key] == -1 {
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return errors.New("sysctl() failed for " + key)
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}
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if pages[key] == -2 {
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return errors.New("sysctl() failed for " + key + ", wrong buffer size")
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}
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}
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log.Debugf("Set node_mem: %#v", pages)
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for k, v := range pages {
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if _, ok := c.metrics[k]; !ok {
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c.metrics[k] = prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: memInfoSubsystem,
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Name: k,
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Help: k + " from sysctl()",
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})
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}
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// Convert metrics to kB (same as Linux meminfo).
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c.metrics[k].Set(float64(v) * float64(size))
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c.metrics[k].Collect(ch)
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}
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return err
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}
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