151 lines
3.5 KiB
Go
151 lines
3.5 KiB
Go
// Copyright 2020 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.
|
|
|
|
package procfs
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"fmt"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/prometheus/procfs/internal/util"
|
|
)
|
|
|
|
var (
|
|
slabSpace = regexp.MustCompile(`\s+`)
|
|
slabVer = regexp.MustCompile(`slabinfo -`)
|
|
slabHeader = regexp.MustCompile(`# name`)
|
|
)
|
|
|
|
// Slab represents a slab pool in the kernel.
|
|
type Slab struct {
|
|
Name string
|
|
ObjActive int64
|
|
ObjNum int64
|
|
ObjSize int64
|
|
ObjPerSlab int64
|
|
PagesPerSlab int64
|
|
// tunables
|
|
Limit int64
|
|
Batch int64
|
|
SharedFactor int64
|
|
SlabActive int64
|
|
SlabNum int64
|
|
SharedAvail int64
|
|
}
|
|
|
|
// SlabInfo represents info for all slabs.
|
|
type SlabInfo struct {
|
|
Slabs []*Slab
|
|
}
|
|
|
|
func shouldParseSlab(line string) bool {
|
|
if slabVer.MatchString(line) {
|
|
return false
|
|
}
|
|
if slabHeader.MatchString(line) {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
// parseV21SlabEntry is used to parse a line from /proc/slabinfo version 2.1.
|
|
func parseV21SlabEntry(line string) (*Slab, error) {
|
|
// First cleanup whitespace.
|
|
l := slabSpace.ReplaceAllString(line, " ")
|
|
s := strings.Split(l, " ")
|
|
if len(s) != 16 {
|
|
return nil, fmt.Errorf("unable to parse: %q", line)
|
|
}
|
|
var err error
|
|
i := &Slab{Name: s[0]}
|
|
i.ObjActive, err = strconv.ParseInt(s[1], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.ObjNum, err = strconv.ParseInt(s[2], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.ObjSize, err = strconv.ParseInt(s[3], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.ObjPerSlab, err = strconv.ParseInt(s[4], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.PagesPerSlab, err = strconv.ParseInt(s[5], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.Limit, err = strconv.ParseInt(s[8], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.Batch, err = strconv.ParseInt(s[9], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.SharedFactor, err = strconv.ParseInt(s[10], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.SlabActive, err = strconv.ParseInt(s[13], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.SlabNum, err = strconv.ParseInt(s[14], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
i.SharedAvail, err = strconv.ParseInt(s[15], 10, 64)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return i, nil
|
|
}
|
|
|
|
// parseSlabInfo21 is used to parse a slabinfo 2.1 file.
|
|
func parseSlabInfo21(r *bytes.Reader) (SlabInfo, error) {
|
|
scanner := bufio.NewScanner(r)
|
|
s := SlabInfo{Slabs: []*Slab{}}
|
|
for scanner.Scan() {
|
|
line := scanner.Text()
|
|
if !shouldParseSlab(line) {
|
|
continue
|
|
}
|
|
slab, err := parseV21SlabEntry(line)
|
|
if err != nil {
|
|
return s, err
|
|
}
|
|
s.Slabs = append(s.Slabs, slab)
|
|
}
|
|
return s, nil
|
|
}
|
|
|
|
// SlabInfo reads data from `/proc/slabinfo`.
|
|
func (fs FS) SlabInfo() (SlabInfo, error) {
|
|
// TODO: Consider passing options to allow for parsing different
|
|
// slabinfo versions. However, slabinfo 2.1 has been stable since
|
|
// kernel 2.6.10 and later.
|
|
data, err := util.ReadFileNoStat(fs.proc.Path("slabinfo"))
|
|
if err != nil {
|
|
return SlabInfo{}, err
|
|
}
|
|
|
|
return parseSlabInfo21(bytes.NewReader(data))
|
|
}
|