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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.
//go:build !nomeminfo_numa
// +build !nomeminfo_numa
package collector
import (
"bufio"
"fmt"
"io"
"log/slog"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
const (
memInfoNumaSubsystem = "memory_numa"
)
var meminfoNodeRE = regexp.MustCompile(`.*devices/system/node/node([0-9]*)`)
type meminfoMetric struct {
metricName string
metricType prometheus.ValueType
numaNode string
value float64
}
type meminfoNumaCollector struct {
metricDescs map[string]*prometheus.Desc
logger *slog.Logger
}
func init() {
registerCollector("meminfo_numa", defaultDisabled, NewMeminfoNumaCollector)
}
// NewMeminfoNumaCollector returns a new Collector exposing memory stats.
func NewMeminfoNumaCollector(logger *slog.Logger) (Collector, error) {
return &meminfoNumaCollector{
metricDescs: map[string]*prometheus.Desc{},
logger: logger,
}, nil
}
func (c *meminfoNumaCollector) Update(ch chan<- prometheus.Metric) error {
metrics, err := getMemInfoNuma()
if err != nil {
return fmt.Errorf("couldn't get NUMA meminfo: %w", err)
}
for _, v := range metrics {
desc, ok := c.metricDescs[v.metricName]
if !ok {
desc = prometheus.NewDesc(
prometheus.BuildFQName(namespace, memInfoNumaSubsystem, v.metricName),
fmt.Sprintf("Memory information field %s.", v.metricName),
[]string{"node"}, nil)
c.metricDescs[v.metricName] = desc
}
ch <- prometheus.MustNewConstMetric(desc, v.metricType, v.value, v.numaNode)
}
return nil
}
func getMemInfoNuma() ([]meminfoMetric, error) {
var (
metrics []meminfoMetric
)
nodes, err := filepath.Glob(sysFilePath("devices/system/node/node[0-9]*"))
if err != nil {
return nil, err
}
for _, node := range nodes {
meminfoFile, err := os.Open(filepath.Join(node, "meminfo"))
if err != nil {
return nil, err
}
defer meminfoFile.Close()
numaInfo, err := parseMemInfoNuma(meminfoFile)
if err != nil {
return nil, err
}
metrics = append(metrics, numaInfo...)
numastatFile, err := os.Open(filepath.Join(node, "numastat"))
if err != nil {
return nil, err
}
defer numastatFile.Close()
nodeNumber := meminfoNodeRE.FindStringSubmatch(node)
if nodeNumber == nil {
return nil, fmt.Errorf("device node string didn't match regexp: %s", node)
}
numaStat, err := parseMemInfoNumaStat(numastatFile, nodeNumber[1])
if err != nil {
return nil, err
}
metrics = append(metrics, numaStat...)
}
return metrics, nil
}
func parseMemInfoNuma(r io.Reader) ([]meminfoMetric, error) {
var (
memInfo []meminfoMetric
scanner = bufio.NewScanner(r)
re = regexp.MustCompile(`\((.*)\)`)
)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" {
continue
}
parts := strings.Fields(line)
fv, err := strconv.ParseFloat(parts[3], 64)
if err != nil {
return nil, fmt.Errorf("invalid value in meminfo: %w", err)
}
switch l := len(parts); {
case l == 4: // no unit
case l == 5 && parts[4] == "kB": // has unit
fv *= 1024
default:
return nil, fmt.Errorf("invalid line in meminfo: %s", line)
}
metric := strings.TrimRight(parts[2], ":")
// Active(anon) -> Active_anon
metric = re.ReplaceAllString(metric, "_${1}")
memInfo = append(memInfo, meminfoMetric{metric, prometheus.GaugeValue, parts[1], fv})
}
return memInfo, scanner.Err()
}
func parseMemInfoNumaStat(r io.Reader, nodeNumber string) ([]meminfoMetric, error) {
var (
numaStat []meminfoMetric
scanner = bufio.NewScanner(r)
)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" {
continue
}
parts := strings.Fields(line)
if len(parts) != 2 {
return nil, fmt.Errorf("line scan did not return 2 fields: %s", line)
}
fv, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return nil, fmt.Errorf("invalid value in numastat: %w", err)
}
numaStat = append(numaStat, meminfoMetric{parts[0] + "_total", prometheus.CounterValue, nodeNumber, fv})
}
return numaStat, scanner.Err()
}
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