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https://github.com/prometheus/node_exporter.git
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0e78ed63a6
Add new collector which exposes the content of /sys/kernel/mm/ksm directory. This directory contains control and statistics files for Kernel Samepage Merging daemon. The collector is not enabled by default. Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
84 lines
2.1 KiB
Go
84 lines
2.1 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 !noksmd
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package collector
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import (
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"fmt"
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"path"
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"github.com/prometheus/client_golang/prometheus"
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)
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var (
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ksmdFiles = []string{"full_scans", "merge_across_nodes", "pages_shared", "pages_sharing",
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"pages_to_scan", "pages_unshared", "pages_volatile", "run", "sleep_millisecs"}
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)
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type ksmdCollector struct {
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metricDescs map[string]*prometheus.Desc
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}
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func init() {
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Factories["ksmd"] = NewKsmdCollector
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}
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func getCanonicalMetricName(filename string) string {
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switch filename {
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case "full_scans":
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return filename + "_total"
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case "sleep_millisecs":
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return "sleep_seconds"
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default:
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return filename
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}
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// kernel/system statistics.
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func NewKsmdCollector() (Collector, error) {
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subsystem := "ksmd"
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descs := make(map[string]*prometheus.Desc)
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for _, n := range ksmdFiles {
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descs[n] = prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, subsystem, getCanonicalMetricName(n)),
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fmt.Sprintf("ksmd '%s' file.", n), nil, nil)
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}
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return &ksmdCollector{descs}, nil
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}
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// Expose kernel and system statistics.
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func (c *ksmdCollector) Update(ch chan<- prometheus.Metric) (err error) {
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for _, n := range ksmdFiles {
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val, err := readUintFromFile(sysFilePath(path.Join("kernel/mm/ksm", n)))
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if err != nil {
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return err
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}
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t := prometheus.GaugeValue
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v := float64(val)
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switch n {
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case "full_scans":
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t = prometheus.CounterValue
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case "sleep_millisecs":
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v /= 1000
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}
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ch <- prometheus.MustNewConstMetric(c.metricDescs[n], t, v)
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}
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return nil
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}
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