1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
package cgroups
import (
"bufio"
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
type blkioHandler struct {
}
func getBlkioHandler() *blkioHandler {
return &blkioHandler{}
}
// Apply set the specified constraints
func (c *blkioHandler) Apply(ctr *CgroupControl, res *spec.LinuxResources) error {
if res.BlockIO == nil {
return nil
}
return fmt.Errorf("blkio apply function not implemented yet")
}
// Create the cgroup
func (c *blkioHandler) Create(ctr *CgroupControl) (bool, error) {
if ctr.cgroup2 {
return false, nil
}
return ctr.createCgroupDirectory(Blkio)
}
// Destroy the cgroup
func (c *blkioHandler) Destroy(ctr *CgroupControl) error {
return rmDirRecursively(ctr.getCgroupv1Path(Blkio))
}
// Stat fills a metrics structure with usage stats for the controller
func (c *blkioHandler) Stat(ctr *CgroupControl, m *Metrics) error {
var ioServiceBytesRecursive []BlkIOEntry
if ctr.cgroup2 {
// more details on the io.stat file format:X https://facebookmicrosites.github.io/cgroup2/docs/io-controller.html
values, err := readCgroup2MapFile(ctr, "io.stat")
if err != nil {
return err
}
for k, v := range values {
d := strings.Split(k, ":")
if len(d) != 2 {
continue
}
minor, err := strconv.ParseUint(d[0], 10, 0)
if err != nil {
return err
}
major, err := strconv.ParseUint(d[1], 10, 0)
if err != nil {
return err
}
for _, item := range v {
d := strings.Split(item, "=")
if len(d) != 2 {
continue
}
op := d[0]
// Accommodate the cgroup v1 naming
switch op {
case "rbytes":
op = "read"
case "wbytes":
op = "write"
}
value, err := strconv.ParseUint(d[1], 10, 0)
if err != nil {
return err
}
entry := BlkIOEntry{
Op: op,
Major: major,
Minor: minor,
Value: value,
}
ioServiceBytesRecursive = append(ioServiceBytesRecursive, entry)
}
}
} else {
BlkioRoot := ctr.getCgroupv1Path(Blkio)
p := filepath.Join(BlkioRoot, "blkio.throttle.io_service_bytes_recursive")
f, err := os.Open(p)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return errors.Wrapf(err, "open %s", p)
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
parts := strings.Fields(line)
if len(parts) < 3 {
continue
}
d := strings.Split(parts[0], ":")
if len(d) != 2 {
continue
}
minor, err := strconv.ParseUint(d[0], 10, 0)
if err != nil {
return err
}
major, err := strconv.ParseUint(d[1], 10, 0)
if err != nil {
return err
}
op := parts[1]
value, err := strconv.ParseUint(parts[2], 10, 0)
if err != nil {
return err
}
entry := BlkIOEntry{
Op: op,
Major: major,
Minor: minor,
Value: value,
}
ioServiceBytesRecursive = append(ioServiceBytesRecursive, entry)
}
if err := scanner.Err(); err != nil {
return errors.Wrapf(err, "parse %s", p)
}
}
m.Blkio = BlkioMetrics{IoServiceBytesRecursive: ioServiceBytesRecursive}
return nil
}
|
