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bpf.go
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bpf.go
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// Copyright 2020 Authors of Cilium
//
// 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.
package metrics
import (
"context"
"encoding/json"
"fmt"
"os/exec"
"time"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
)
type bpfCollector struct {
bpfMapsMemory *prometheus.Desc
bpfProgMemory *prometheus.Desc
}
func newbpfCollector() *bpfCollector {
return &bpfCollector{
bpfMapsMemory: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "bpf_maps_virtual_memory_max_bytes"),
"BPF maps kernel max memory usage size in bytes.",
nil, nil,
),
bpfProgMemory: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "bpf_progs_virtual_memory_max_bytes"),
"BPF programs kernel max memory usage size in bytes.",
nil, nil,
),
}
}
func (s *bpfCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- s.bpfMapsMemory
ch <- s.bpfProgMemory
}
type memoryEntry struct {
BytesMemlock uint64 `json:"bytes_memlock"`
}
func getMemoryUsage(typ string) (uint64, error) {
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
cmd := exec.CommandContext(ctx, "bpftool", "-j", typ, "show")
out, err := cmd.Output()
if err != nil {
return 0, fmt.Errorf("unable to get bpftool output: %w", err)
}
var memoryEntries []memoryEntry
err = json.Unmarshal(out, &memoryEntries)
if err != nil {
return 0, fmt.Errorf("unable to unmarshal bpftool output: %w", err)
}
var totalMem uint64
for _, entry := range memoryEntries {
totalMem += entry.BytesMemlock
}
return totalMem, nil
}
func (s *bpfCollector) Collect(ch chan<- prometheus.Metric) {
mapMem, err := getMemoryUsage("map")
if err != nil {
log.WithError(err).Error("Error while getting BPF maps memory usage")
} else {
ch <- prometheus.MustNewConstMetric(
s.bpfMapsMemory,
prometheus.GaugeValue,
float64(mapMem),
)
}
progMem, err := getMemoryUsage("prog")
if err != nil {
log.WithError(err).Error("Error while getting BPF progs memory usage")
} else {
ch <- prometheus.MustNewConstMetric(
s.bpfProgMemory,
prometheus.GaugeValue,
float64(progMem),
)
}
}