node_exporter/collector/meminfo_bsd.go

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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build freebsd darwin,amd64 dragonfly
// +build !nomeminfo
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package collector
import (
"errors"
"github.com/prometheus/client_golang/prometheus"
)
/*
#include <stddef.h>
#include <sys/sysctl.h>
int _sysctl(const char* name) {
int val;
size_t size = sizeof(val);
int res = sysctlbyname(name, &val, &size, NULL, 0);
if (res == -1) {
return -1;
}
if (size != sizeof(val)) {
return -2;
}
return val;
}
*/
import "C"
const (
memInfoSubsystem = "memory"
)
type meminfoCollector struct{}
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func init() {
Factories["meminfo"] = NewMeminfoCollector
}
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// Takes a prometheus registry and returns a new Collector exposing
// Memory stats.
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func NewMeminfoCollector() (Collector, error) {
return &meminfoCollector{}, nil
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}
func (c *meminfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
var pages map[string]C.int
pages = make(map[string]C.int)
size := C._sysctl(C.CString("vm.stats.vm.v_page_size"))
if size == -1 {
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return errors.New("sysctl(vm.stats.vm.v_page_size) failed")
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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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}
pages["active"] = C._sysctl(C.CString("vm.stats.vm.v_active_count"))
pages["inactive"] = C._sysctl(C.CString("vm.stats.vm.v_inactive_count"))
pages["wire"] = C._sysctl(C.CString("vm.stats.vm.v_wire_count"))
pages["cache"] = C._sysctl(C.CString("vm.stats.vm.v_cache_count"))
pages["free"] = C._sysctl(C.CString("vm.stats.vm.v_free_count"))
pages["swappgsin"] = C._sysctl(C.CString("vm.stats.vm.v_swappgsin"))
pages["swappgsout"] = C._sysctl(C.CString("vm.stats.vm.v_swappgsout"))
pages["total"] = C._sysctl(C.CString("vm.stats.vm.v_page_count"))
for key := range pages {
if pages[key] == -1 {
return errors.New("sysctl() failed for " + key)
}
if pages[key] == -2 {
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return errors.New("sysctl() failed for " + key + ", wrong buffer size")
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}
}
for k, v := range pages {
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(Namespace, memInfoSubsystem, k),
k+" from sysctl()",
nil, nil,
),
// Convert metrics to kB (same as Linux meminfo).
prometheus.UntypedValue, float64(v)*float64(size),
)
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}
return err
}