-
Notifications
You must be signed in to change notification settings - Fork 13
/
dmcache_linux.go
192 lines (173 loc) · 5.85 KB
/
dmcache_linux.go
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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
//go:build linux
// +build linux
package dmcache
import (
"context"
"errors"
"fmt"
"os/exec"
"strconv"
"strings"
"github.com/circonus-labs/circonus-unified-agent/cua"
)
const metricName = "dmcache"
type cacheStatus struct {
device string
length int64
target string
metadataBlocksize int64
metadataUsed int64
metadataTotal int64
cacheBlocksize int64
cacheUsed int64
cacheTotal int64
readHits int64
readMisses int64
writeHits int64
writeMisses int64
demotions int64
promotions int64
dirty int64
}
func (c *DMCache) Gather(ctx context.Context, acc cua.Accumulator) error {
outputLines, err := c.getCurrentStatus()
if err != nil {
return err
}
totalStatus := cacheStatus{}
for _, s := range outputLines {
status, err := parseDMSetupStatus(s)
if err != nil {
return err
}
if c.PerDevice {
tags := map[string]string{"device": status.device}
acc.AddFields(metricName, toFields(status), tags)
}
aggregateStats(&totalStatus, status)
}
acc.AddFields(metricName, toFields(totalStatus), map[string]string{"device": "all"})
return nil
}
func parseDMSetupStatus(line string) (cacheStatus, error) {
var err error
parseError := errors.New("Output from dmsetup could not be parsed")
status := cacheStatus{}
values := strings.Fields(line)
if len(values) < 15 {
return cacheStatus{}, parseError
}
status.device = strings.TrimRight(values[0], ":")
status.length, err = strconv.ParseInt(values[2], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint len (%s): %w", values[2], err)
}
status.target = values[3]
status.metadataBlocksize, err = strconv.ParseInt(values[4], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint blksz (%s): %w", values[4], err)
}
metadata := strings.Split(values[5], "/")
if len(metadata) != 2 {
return cacheStatus{}, parseError
}
status.metadataUsed, err = strconv.ParseInt(metadata[0], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint metaused (%s): %w", metadata[0], err)
}
status.metadataTotal, err = strconv.ParseInt(metadata[1], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint metatot (%s): %w", metadata[1], err)
}
status.cacheBlocksize, err = strconv.ParseInt(values[6], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint cacheblksz (%s): %w", values[6], err)
}
cache := strings.Split(values[7], "/")
if len(cache) != 2 {
return cacheStatus{}, parseError
}
status.cacheUsed, err = strconv.ParseInt(cache[0], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint cacheused (%s): %w", cache[0], err)
}
status.cacheTotal, err = strconv.ParseInt(cache[1], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint cachetot (%s): %w", cache[1], err)
}
status.readHits, err = strconv.ParseInt(values[8], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint rhit (%s): %w", values[8], err)
}
status.readMisses, err = strconv.ParseInt(values[9], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint rmiss (%s): %w", values[9], err)
}
status.writeHits, err = strconv.ParseInt(values[10], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint whit (%s): %w", values[10], err)
}
status.writeMisses, err = strconv.ParseInt(values[11], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint wmiss (%s): %w", values[11], err)
}
status.demotions, err = strconv.ParseInt(values[12], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint demotions (%s): %w", values[12], err)
}
status.promotions, err = strconv.ParseInt(values[13], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint promotions (%s): %w", values[13], err)
}
status.dirty, err = strconv.ParseInt(values[14], 10, 64)
if err != nil {
return cacheStatus{}, fmt.Errorf("dmcache parseint dirty (%s): %w", values[14], err)
}
return status, nil
}
func aggregateStats(totalStatus *cacheStatus, status cacheStatus) {
totalStatus.length += status.length
totalStatus.metadataBlocksize += status.metadataBlocksize
totalStatus.metadataUsed += status.metadataUsed
totalStatus.metadataTotal += status.metadataTotal
totalStatus.cacheBlocksize += status.cacheBlocksize
totalStatus.cacheUsed += status.cacheUsed
totalStatus.cacheTotal += status.cacheTotal
totalStatus.readHits += status.readHits
totalStatus.readMisses += status.readMisses
totalStatus.writeHits += status.writeHits
totalStatus.writeMisses += status.writeMisses
totalStatus.demotions += status.demotions
totalStatus.promotions += status.promotions
totalStatus.dirty += status.dirty
}
func toFields(status cacheStatus) map[string]interface{} {
fields := make(map[string]interface{})
fields["length"] = status.length
fields["metadata_blocksize"] = status.metadataBlocksize
fields["metadata_used"] = status.metadataUsed
fields["metadata_total"] = status.metadataTotal
fields["cache_blocksize"] = status.cacheBlocksize
fields["cache_used"] = status.cacheUsed
fields["cache_total"] = status.cacheTotal
fields["read_hits"] = status.readHits
fields["read_misses"] = status.readMisses
fields["write_hits"] = status.writeHits
fields["write_misses"] = status.writeMisses
fields["demotions"] = status.demotions
fields["promotions"] = status.promotions
fields["dirty"] = status.dirty
return fields
}
func dmSetupStatus() ([]string, error) {
out, err := exec.Command("/bin/sh", "-c", "sudo /sbin/dmsetup status --target cache").Output()
if err != nil {
return nil, fmt.Errorf("dmcache exec: %w", err)
}
if string(out) == "No devices found\n" {
return []string{}, nil
}
outString := strings.TrimRight(string(out), "\n")
status := strings.Split(outString, "\n")
return status, nil
}