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https://github.com/prometheus/node_exporter.git
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d2a43f7d05
This removes some error handling, which should be fine. If the calls fail, we will get the zeroes, which is a safe enough fallback. Additionally, if the first sysctl (page_size) succeeded it is unlikely that other ones will fail.
71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build freebsd darwin,amd64 dragonfly
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// +build !nomeminfo
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package collector
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import (
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"fmt"
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"github.com/prometheus/client_golang/prometheus"
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"golang.org/x/sys/unix"
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)
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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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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{}, nil
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}
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func (c *meminfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
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pages := make(map[string]uint32)
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size, err := unix.SysctlUint32("vm.stats.vm.v_page_size")
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if err != nil {
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return fmt.Errorf("sysctl(vm.stats.vm.v_page_size) failed: %s", err)
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}
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pages["active"], _ = unix.SysctlUint32("vm.stats.vm.v_active_count")
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pages["inactive"], _ = unix.SysctlUint32("vm.stats.vm.v_inactive_count")
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pages["wire"], _ = unix.SysctlUint32("vm.stats.vm.v_wire_count")
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pages["cache"], _ = unix.SysctlUint32("vm.stats.vm.v_cache_count")
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pages["free"], _ = unix.SysctlUint32("vm.stats.vm.v_free_count")
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pages["swappgsin"], _ = unix.SysctlUint32("vm.stats.vm.v_swappgsin")
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pages["swappgsout"], _ = unix.SysctlUint32("vm.stats.vm.v_swappgsout")
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pages["total"], _ = unix.SysctlUint32("vm.stats.vm.v_page_count")
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for k, v := range pages {
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ch <- prometheus.MustNewConstMetric(
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prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, memInfoSubsystem, k),
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k+" from sysctl()",
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nil, nil,
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),
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// Convert metrics to kB (same as Linux meminfo).
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prometheus.UntypedValue, float64(v)*float64(size),
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)
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}
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return err
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}
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