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
|
// 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.
//go:build !nomeminfo
// +build !nomeminfo
package collector
import (
"log/slog"
"unsafe"
"golang.org/x/sys/unix"
)
const (
CTL_VFS = 10
VFS_GENERIC = 0
VFS_BCACHESTAT = 3
)
type bcachestats struct {
Numbufs int64
Numbufpages int64
Numdirtypages int64
Numcleanpages int64
Pendingwrites int64
Pendingreads int64
Numwrites int64
Numreads int64
Cachehits int64
Busymapped int64
Dmapages int64
Highpages int64
Delwribufs int64
Kvaslots int64
Kvaslots_avail int64
Highflips int64
Highflops int64
Dmaflips int64
}
type meminfoCollector struct {
logger *slog.Logger
}
// NewMeminfoCollector returns a new Collector exposing memory stats.
func NewMeminfoCollector(logger *slog.Logger) (Collector, error) {
return &meminfoCollector{
logger: logger,
}, nil
}
func (c *meminfoCollector) getMemInfo() (map[string]float64, error) {
uvmexpb, err := unix.SysctlRaw("vm.uvmexp")
if err != nil {
return nil, err
}
mib := [3]_C_int{CTL_VFS, VFS_GENERIC, VFS_BCACHESTAT}
bcstatsb, err := sysctl(mib[:])
if err != nil {
return nil, err
}
uvmexp := *(*unix.Uvmexp)(unsafe.Pointer(&uvmexpb[0]))
ps := float64(uvmexp.Pagesize)
bcstats := *(*bcachestats)(unsafe.Pointer(&bcstatsb[0]))
// see uvm(9)
return map[string]float64{
"active_bytes": ps * float64(uvmexp.Active),
"cache_bytes": ps * float64(bcstats.Numbufpages),
"free_bytes": ps * float64(uvmexp.Free),
"inactive_bytes": ps * float64(uvmexp.Inactive),
"size_bytes": ps * float64(uvmexp.Npages),
"swap_size_bytes": ps * float64(uvmexp.Swpages),
"swap_used_bytes": ps * float64(uvmexp.Swpginuse),
"swapped_in_pages_bytes_total": ps * float64(uvmexp.Pgswapin),
"swapped_out_pages_bytes_total": ps * float64(uvmexp.Pgswapout),
"wired_bytes": ps * float64(uvmexp.Wired),
}, nil
}
|
