122 lines
3.5 KiB
Go
122 lines
3.5 KiB
Go
// Copyright 2022 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 linux && !noslabinfo
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// +build linux,!noslabinfo
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package collector
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import (
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"fmt"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs"
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)
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type slabinfoCollector struct {
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fs procfs.FS
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logger log.Logger
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subsystem string
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labels []string
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}
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func init() {
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registerCollector("slabinfo", defaultDisabled, NewSlabinfoCollector)
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}
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func NewSlabinfoCollector(logger log.Logger) (Collector, error) {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open procfs: %w", err)
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}
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return &slabinfoCollector{logger: logger,
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fs: fs,
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subsystem: "slabinfo",
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labels: []string{"slab"},
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}, nil
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}
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func (c *slabinfoCollector) Update(ch chan<- prometheus.Metric) error {
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slabinfo, err := c.fs.SlabInfo()
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if err != nil {
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return fmt.Errorf("couldn't get %s: %w", c.subsystem, err)
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}
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for _, slab := range slabinfo.Slabs {
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ch <- c.activeObjects(slab.Name, slab.ObjActive)
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ch <- c.objects(slab.Name, slab.ObjNum)
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ch <- c.objectSizeBytes(slab.Name, slab.ObjSize)
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ch <- c.objectsPerSlab(slab.Name, slab.ObjPerSlab)
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ch <- c.pagesPerSlab(slab.Name, slab.PagesPerSlab)
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}
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return nil
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}
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func (c *slabinfoCollector) activeObjects(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "active_objects"),
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"The number of objects that are currently active (i.e., in use).",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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func (c *slabinfoCollector) objects(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "objects"),
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"The total number of allocated objects (i.e., objects that are both in use and not in use).",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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func (c *slabinfoCollector) objectSizeBytes(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "object_size_bytes"),
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"The size of objects in this slab, in bytes.",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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func (c *slabinfoCollector) objectsPerSlab(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "objects_per_slab"),
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"The number of objects stored in each slab.",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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func (c *slabinfoCollector) pagesPerSlab(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "pages_per_slab"),
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"The number of pages allocated for each slab.",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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