141 lines
3.6 KiB
Go
141 lines
3.6 KiB
Go
// Copyright 2019 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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//go:build !norapl
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// +build !norapl
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package collector
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import (
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"errors"
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"fmt"
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"os"
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"strconv"
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"github.com/alecthomas/kingpin/v2"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs/sysfs"
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)
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const raplCollectorSubsystem = "rapl"
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type raplCollector struct {
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fs sysfs.FS
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logger log.Logger
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joulesMetricDesc *prometheus.Desc
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}
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func init() {
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registerCollector(raplCollectorSubsystem, defaultEnabled, NewRaplCollector)
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}
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var (
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raplZoneLabel = kingpin.Flag("collector.rapl.enable-zone-label", "Enables service unit metric unit_start_time_seconds").Bool()
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)
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// NewRaplCollector returns a new Collector exposing RAPL metrics.
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func NewRaplCollector(logger log.Logger) (Collector, error) {
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fs, err := sysfs.NewFS(*sysPath)
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if err != nil {
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return nil, err
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}
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joulesMetricDesc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, raplCollectorSubsystem, "joules_total"),
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"Current RAPL value in joules",
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[]string{"index", "path", "rapl_zone"}, nil,
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)
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collector := raplCollector{
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fs: fs,
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logger: logger,
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joulesMetricDesc: joulesMetricDesc,
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}
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return &collector, nil
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}
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// Update implements Collector and exposes RAPL related metrics.
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func (c *raplCollector) Update(ch chan<- prometheus.Metric) error {
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// nil zones are fine when platform doesn't have powercap files present.
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zones, err := sysfs.GetRaplZones(c.fs)
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if err != nil {
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if errors.Is(err, os.ErrNotExist) {
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level.Debug(c.logger).Log("msg", "Platform doesn't have powercap files present", "err", err)
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return ErrNoData
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}
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if errors.Is(err, os.ErrPermission) {
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level.Debug(c.logger).Log("msg", "Can't access powercap files", "err", err)
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return ErrNoData
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}
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return fmt.Errorf("failed to retrieve rapl stats: %w", err)
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}
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for _, rz := range zones {
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microJoules, err := rz.GetEnergyMicrojoules()
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if err != nil {
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if errors.Is(err, os.ErrPermission) {
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level.Debug(c.logger).Log("msg", "Can't access energy_uj file", "zone", rz, "err", err)
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return ErrNoData
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}
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return err
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}
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joules := float64(microJoules) / 1000000.0
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if *raplZoneLabel {
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ch <- c.joulesMetricWithZoneLabel(rz, joules)
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} else {
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ch <- c.joulesMetric(rz, joules)
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}
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}
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return nil
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}
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func (c *raplCollector) joulesMetric(z sysfs.RaplZone, v float64) prometheus.Metric {
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index := strconv.Itoa(z.Index)
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descriptor := prometheus.NewDesc(
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prometheus.BuildFQName(
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namespace,
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raplCollectorSubsystem,
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fmt.Sprintf("%s_joules_total", SanitizeMetricName(z.Name)),
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),
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fmt.Sprintf("Current RAPL %s value in joules", z.Name),
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[]string{"index", "path"}, nil,
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)
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return prometheus.MustNewConstMetric(
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descriptor,
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prometheus.CounterValue,
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v,
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index,
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z.Path,
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)
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}
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func (c *raplCollector) joulesMetricWithZoneLabel(z sysfs.RaplZone, v float64) prometheus.Metric {
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index := strconv.Itoa(z.Index)
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return prometheus.MustNewConstMetric(
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c.joulesMetricDesc,
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prometheus.CounterValue,
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v,
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index,
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z.Path,
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z.Name,
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)
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}
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