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// Copyright 2022 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 !noslabinfo
// +build !noslabinfo
package collector
import (
"fmt"
"log/slog"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs"
"gopkg.in/alecthomas/kingpin.v2"
)
var (
slabNameInclude = kingpin.Flag("collector.slabinfo.slabs-include", "Regexp of slabs to include in slabinfo collector.").Default(".*").String()
slabNameExclude = kingpin.Flag("collector.slabinfo.slabs-exclude", "Regexp of slabs to exclude in slabinfo collector.").Default("").String()
)
type slabinfoCollector struct {
fs procfs.FS
logger *slog.Logger
subsystem string
labels []string
slabNameFilter deviceFilter
}
func init() {
registerCollector("slabinfo", defaultDisabled, NewSlabinfoCollector)
}
func NewSlabinfoCollector(logger *slog.Logger) (Collector, error) {
fs, err := procfs.NewFS(*procPath)
if err != nil {
return nil, fmt.Errorf("failed to open procfs: %w", err)
}
return &slabinfoCollector{logger: logger,
fs: fs,
subsystem: "slabinfo",
labels: []string{"slab"},
slabNameFilter: newDeviceFilter(*slabNameExclude, *slabNameInclude),
}, nil
}
func (c *slabinfoCollector) Update(ch chan<- prometheus.Metric) error {
slabinfo, err := c.fs.SlabInfo()
if err != nil {
return fmt.Errorf("couldn't get %s: %w", c.subsystem, err)
}
for _, slab := range slabinfo.Slabs {
if c.slabNameFilter.ignored(slab.Name) {
continue
}
ch <- c.activeObjects(slab.Name, slab.ObjActive)
ch <- c.objects(slab.Name, slab.ObjNum)
ch <- c.objectSizeBytes(slab.Name, slab.ObjSize)
ch <- c.objectsPerSlab(slab.Name, slab.ObjPerSlab)
ch <- c.pagesPerSlab(slab.Name, slab.PagesPerSlab)
}
return nil
}
func (c *slabinfoCollector) activeObjects(label string, val int64) prometheus.Metric {
desc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, c.subsystem, "active_objects"),
"The number of objects that are currently active (i.e., in use).",
c.labels, nil)
return prometheus.MustNewConstMetric(
desc, prometheus.GaugeValue, float64(val), label,
)
}
func (c *slabinfoCollector) objects(label string, val int64) prometheus.Metric {
desc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, c.subsystem, "objects"),
"The total number of allocated objects (i.e., objects that are both in use and not in use).",
c.labels, nil)
return prometheus.MustNewConstMetric(
desc, prometheus.GaugeValue, float64(val), label,
)
}
func (c *slabinfoCollector) objectSizeBytes(label string, val int64) prometheus.Metric {
desc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, c.subsystem, "object_size_bytes"),
"The size of objects in this slab, in bytes.",
c.labels, nil)
return prometheus.MustNewConstMetric(
desc, prometheus.GaugeValue, float64(val), label,
)
}
func (c *slabinfoCollector) objectsPerSlab(label string, val int64) prometheus.Metric {
desc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, c.subsystem, "objects_per_slab"),
"The number of objects stored in each slab.",
c.labels, nil)
return prometheus.MustNewConstMetric(
desc, prometheus.GaugeValue, float64(val), label,
)
}
func (c *slabinfoCollector) pagesPerSlab(label string, val int64) prometheus.Metric {
desc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, c.subsystem, "pages_per_slab"),
"The number of pages allocated for each slab.",
c.labels, nil)
return prometheus.MustNewConstMetric(
desc, prometheus.GaugeValue, float64(val), label,
)
}
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