Adding support for /proc/buddyinfo for linux free memory fragmentation.
/prod/buddyinfo returns data on the free blocks fragments available for use from the kernel. This data is useful when diagnosing possible memory fragmentation. More info can be found in: * https://lwn.net/Articles/7868/ * https://andorian.blogspot.com/2014/03/making-sense-of-procbuddyinfo.html
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// 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 !nobuddyinfo
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// +build !windows,!netbsd
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package collector
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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)
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type buddyInfo map[string]map[string][]float64
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const (
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buddyInfoSubsystem = "buddyinfo"
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)
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type buddyinfoCollector struct {
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desc *prometheus.Desc
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}
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func init() {
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Factories["buddyinfo"] = NewBuddyinfoCollector
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}
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// NewBuddyinfoCollector returns a new Collector exposing buddyinfo stats.
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func NewBuddyinfoCollector() (Collector, error) {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, buddyInfoSubsystem, "count"),
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"Count of free blocks according to size.",
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[]string{"node", "zone", "size"}, nil,
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)
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return &buddyinfoCollector{desc}, nil
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}
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// Update calls (*buddyinfoCollector).getBuddyInfo to get the platform specific
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// buddyinfo metrics.
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func (c *buddyinfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
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buddyInfo, err := c.getBuddyInfo()
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if err != nil {
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return fmt.Errorf("couldn't get buddyinfo: %s", err)
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}
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log.Debugf("Set node_buddy: %#v", buddyInfo)
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for node, zones := range buddyInfo {
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for zone, values := range zones {
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for size, value := range values {
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ch <- prometheus.MustNewConstMetric(
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c.desc,
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prometheus.GaugeValue, value,
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node, zone, strconv.Itoa(size),
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)
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}
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}
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}
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return nil
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}
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func (c *buddyinfoCollector) getBuddyInfo() (buddyInfo, error) {
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file, err := os.Open(procFilePath("buddyinfo"))
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if err != nil {
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return nil, err
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}
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defer file.Close()
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return parseBuddyInfo(file)
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}
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func parseBuddyInfo(r io.Reader) (buddyInfo, error) {
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var (
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buddyInfo = buddyInfo{}
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scanner = bufio.NewScanner(r)
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)
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for scanner.Scan() {
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var err error
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line := scanner.Text()
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parts := strings.Fields(string(line))
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node := strings.TrimRight(parts[1], ",")
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zone := strings.TrimRight(parts[3], ",")
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arraySize := len(parts[4:])
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sizes := make([]float64, arraySize)
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for i := 0; i < arraySize; i++ {
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sizes[i], err = strconv.ParseFloat(parts[i+4], 64)
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if err != nil {
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return nil, fmt.Errorf("invalid value in buddyinfo: %s", err)
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}
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}
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if _, ok := buddyInfo[node]; !ok {
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buddyInfo[node] = make(map[string][]float64)
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}
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buddyInfo[node][zone] = sizes
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}
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return buddyInfo, nil
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}
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// 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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package collector
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import (
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"os"
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"testing"
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)
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func TestBuddyInfo(t *testing.T) {
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file, err := os.Open("fixtures/proc/buddyinfo")
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if err != nil {
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t.Fatal(err)
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}
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defer file.Close()
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buddyInfo, err := parseBuddyInfo(file)
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if err != nil {
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t.Fatal(err)
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}
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if want, got := 4381.0, buddyInfo["0"]["Normal"][0]; want != got {
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t.Errorf("want Node 0, Zone Normal %f, got %f", want, got)
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}
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if want, got := 572.0, buddyInfo["0"]["DMA32"][1]; want != got {
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t.Errorf("want Node 0, Zone DMA32 %f, got %f", want, got)
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}
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}
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@ -0,0 +1,3 @@
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Node 0, zone DMA 1 0 1 0 2 1 1 0 1 1 3
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Node 0, zone DMA32 759 572 791 475 194 45 12 0 0 0 0
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Node 0, zone Normal 4381 1093 185 1530 567 102 4 0 0 0 0
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