aboutsummaryrefslogtreecommitdiff
path: root/vendor/github.com/prometheus/procfs/proc_status.go
blob: c58346d910f70a5db81e2ce0ee285ee7eefb8e64 (plain)
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
// Copyright 2018 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 (
	"bytes"
	"strconv"
	"strings"

	"github.com/prometheus/procfs/internal/util"
)

// ProcStatus provides status information about the process,
// read from /proc/[pid]/stat.
type ProcStatus struct {
	// The process ID.
	PID int
	// The process name.
	Name string

	// Thread group ID.
	TGID int

	// Peak virtual memory size.
	VmPeak uint64 // nolint:golint
	// Virtual memory size.
	VmSize uint64 // nolint:golint
	// Locked memory size.
	VmLck uint64 // nolint:golint
	// Pinned memory size.
	VmPin uint64 // nolint:golint
	// Peak resident set size.
	VmHWM uint64 // nolint:golint
	// Resident set size (sum of RssAnnon RssFile and RssShmem).
	VmRSS uint64 // nolint:golint
	// Size of resident anonymous memory.
	RssAnon uint64 // nolint:golint
	// Size of resident file mappings.
	RssFile uint64 // nolint:golint
	// Size of resident shared memory.
	RssShmem uint64 // nolint:golint
	// Size of data segments.
	VmData uint64 // nolint:golint
	// Size of stack segments.
	VmStk uint64 // nolint:golint
	// Size of text segments.
	VmExe uint64 // nolint:golint
	// Shared library code size.
	VmLib uint64 // nolint:golint
	// Page table entries size.
	VmPTE uint64 // nolint:golint
	// Size of second-level page tables.
	VmPMD uint64 // nolint:golint
	// Swapped-out virtual memory size by anonymous private.
	VmSwap uint64 // nolint:golint
	// Size of hugetlb memory portions
	HugetlbPages uint64

	// Number of voluntary context switches.
	VoluntaryCtxtSwitches uint64
	// Number of involuntary context switches.
	NonVoluntaryCtxtSwitches uint64

	// UIDs of the process (Real, effective, saved set, and filesystem UIDs (GIDs))
	UIDs [4]string
}

// NewStatus returns the current status information of the process.
func (p Proc) NewStatus() (ProcStatus, error) {
	data, err := util.ReadFileNoStat(p.path("status"))
	if err != nil {
		return ProcStatus{}, err
	}

	s := ProcStatus{PID: p.PID}

	lines := strings.Split(string(data), "\n")
	for _, line := range lines {
		if !bytes.Contains([]byte(line), []byte(":")) {
			continue
		}

		kv := strings.SplitN(line, ":", 2)

		// removes spaces
		k := string(strings.TrimSpace(kv[0]))
		v := string(strings.TrimSpace(kv[1]))
		// removes "kB"
		v = string(bytes.Trim([]byte(v), " kB"))

		// value to int when possible
		// we can skip error check here, 'cause vKBytes is not used when value is a string
		vKBytes, _ := strconv.ParseUint(v, 10, 64)
		// convert kB to B
		vBytes := vKBytes * 1024

		s.fillStatus(k, v, vKBytes, vBytes)
	}

	return s, nil
}

func (s *ProcStatus) fillStatus(k string, vString string, vUint uint64, vUintBytes uint64) {
	switch k {
	case "Tgid":
		s.TGID = int(vUint)
	case "Name":
		s.Name = vString
	case "Uid":
		copy(s.UIDs[:], strings.Split(vString, "\t"))
	case "VmPeak":
		s.VmPeak = vUintBytes
	case "VmSize":
		s.VmSize = vUintBytes
	case "VmLck":
		s.VmLck = vUintBytes
	case "VmPin":
		s.VmPin = vUintBytes
	case "VmHWM":
		s.VmHWM = vUintBytes
	case "VmRSS":
		s.VmRSS = vUintBytes
	case "RssAnon":
		s.RssAnon = vUintBytes
	case "RssFile":
		s.RssFile = vUintBytes
	case "RssShmem":
		s.RssShmem = vUintBytes
	case "VmData":
		s.VmData = vUintBytes
	case "VmStk":
		s.VmStk = vUintBytes
	case "VmExe":
		s.VmExe = vUintBytes
	case "VmLib":
		s.VmLib = vUintBytes
	case "VmPTE":
		s.VmPTE = vUintBytes
	case "VmPMD":
		s.VmPMD = vUintBytes
	case "VmSwap":
		s.VmSwap = vUintBytes
	case "HugetlbPages":
		s.HugetlbPages = vUintBytes
	case "voluntary_ctxt_switches":
		s.VoluntaryCtxtSwitches = vUint
	case "nonvoluntary_ctxt_switches":
		s.NonVoluntaryCtxtSwitches = vUint
	}
}

// TotalCtxtSwitches returns the total context switch.
func (s ProcStatus) TotalCtxtSwitches() uint64 {
	return s.VoluntaryCtxtSwitches + s.NonVoluntaryCtxtSwitches
}