source: code/trunk/vendor/github.com/prometheus/procfs/vm.go@ 822

Last change on this file since 822 was 822, checked in by yakumo.izuru, 22 months ago

Prefer immortal.run over runit and rc.d, use vendored modules
for convenience.

Signed-off-by: Izuru Yakumo <yakumo.izuru@…>
File size: 7.7 KB
Line 
1// Copyright 2019 The Prometheus Authors
2// Licensed under the Apache License, Version 2.0 (the "License");
3// you may not use this file except in compliance with the License.
4// You may obtain a copy of the License at
5//
6// http://www.apache.org/licenses/LICENSE-2.0
7//
8// Unless required by applicable law or agreed to in writing, software
9// distributed under the License is distributed on an "AS IS" BASIS,
10// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11// See the License for the specific language governing permissions and
12// limitations under the License.
13
14//go:build !windows
15// +build !windows
16
17package procfs
18
19import (
20 "fmt"
21 "os"
22 "path/filepath"
23 "strings"
24
25 "github.com/prometheus/procfs/internal/util"
26)
27
28// The VM interface is described at
29// https://www.kernel.org/doc/Documentation/sysctl/vm.txt
30// Each setting is exposed as a single file.
31// Each file contains one line with a single numerical value, except lowmem_reserve_ratio which holds an array
32// and numa_zonelist_order (deprecated) which is a string.
33type VM struct {
34 AdminReserveKbytes *int64 // /proc/sys/vm/admin_reserve_kbytes
35 BlockDump *int64 // /proc/sys/vm/block_dump
36 CompactUnevictableAllowed *int64 // /proc/sys/vm/compact_unevictable_allowed
37 DirtyBackgroundBytes *int64 // /proc/sys/vm/dirty_background_bytes
38 DirtyBackgroundRatio *int64 // /proc/sys/vm/dirty_background_ratio
39 DirtyBytes *int64 // /proc/sys/vm/dirty_bytes
40 DirtyExpireCentisecs *int64 // /proc/sys/vm/dirty_expire_centisecs
41 DirtyRatio *int64 // /proc/sys/vm/dirty_ratio
42 DirtytimeExpireSeconds *int64 // /proc/sys/vm/dirtytime_expire_seconds
43 DirtyWritebackCentisecs *int64 // /proc/sys/vm/dirty_writeback_centisecs
44 DropCaches *int64 // /proc/sys/vm/drop_caches
45 ExtfragThreshold *int64 // /proc/sys/vm/extfrag_threshold
46 HugetlbShmGroup *int64 // /proc/sys/vm/hugetlb_shm_group
47 LaptopMode *int64 // /proc/sys/vm/laptop_mode
48 LegacyVaLayout *int64 // /proc/sys/vm/legacy_va_layout
49 LowmemReserveRatio []*int64 // /proc/sys/vm/lowmem_reserve_ratio
50 MaxMapCount *int64 // /proc/sys/vm/max_map_count
51 MemoryFailureEarlyKill *int64 // /proc/sys/vm/memory_failure_early_kill
52 MemoryFailureRecovery *int64 // /proc/sys/vm/memory_failure_recovery
53 MinFreeKbytes *int64 // /proc/sys/vm/min_free_kbytes
54 MinSlabRatio *int64 // /proc/sys/vm/min_slab_ratio
55 MinUnmappedRatio *int64 // /proc/sys/vm/min_unmapped_ratio
56 MmapMinAddr *int64 // /proc/sys/vm/mmap_min_addr
57 NrHugepages *int64 // /proc/sys/vm/nr_hugepages
58 NrHugepagesMempolicy *int64 // /proc/sys/vm/nr_hugepages_mempolicy
59 NrOvercommitHugepages *int64 // /proc/sys/vm/nr_overcommit_hugepages
60 NumaStat *int64 // /proc/sys/vm/numa_stat
61 NumaZonelistOrder string // /proc/sys/vm/numa_zonelist_order
62 OomDumpTasks *int64 // /proc/sys/vm/oom_dump_tasks
63 OomKillAllocatingTask *int64 // /proc/sys/vm/oom_kill_allocating_task
64 OvercommitKbytes *int64 // /proc/sys/vm/overcommit_kbytes
65 OvercommitMemory *int64 // /proc/sys/vm/overcommit_memory
66 OvercommitRatio *int64 // /proc/sys/vm/overcommit_ratio
67 PageCluster *int64 // /proc/sys/vm/page-cluster
68 PanicOnOom *int64 // /proc/sys/vm/panic_on_oom
69 PercpuPagelistFraction *int64 // /proc/sys/vm/percpu_pagelist_fraction
70 StatInterval *int64 // /proc/sys/vm/stat_interval
71 Swappiness *int64 // /proc/sys/vm/swappiness
72 UserReserveKbytes *int64 // /proc/sys/vm/user_reserve_kbytes
73 VfsCachePressure *int64 // /proc/sys/vm/vfs_cache_pressure
74 WatermarkBoostFactor *int64 // /proc/sys/vm/watermark_boost_factor
75 WatermarkScaleFactor *int64 // /proc/sys/vm/watermark_scale_factor
76 ZoneReclaimMode *int64 // /proc/sys/vm/zone_reclaim_mode
77}
78
79// VM reads the VM statistics from the specified `proc` filesystem.
80func (fs FS) VM() (*VM, error) {
81 path := fs.proc.Path("sys/vm")
82 file, err := os.Stat(path)
83 if err != nil {
84 return nil, err
85 }
86 if !file.Mode().IsDir() {
87 return nil, fmt.Errorf("%s is not a directory", path)
88 }
89
90 files, err := os.ReadDir(path)
91 if err != nil {
92 return nil, err
93 }
94
95 var vm VM
96 for _, f := range files {
97 if f.IsDir() {
98 continue
99 }
100
101 name := filepath.Join(path, f.Name())
102 // ignore errors on read, as there are some write only
103 // in /proc/sys/vm
104 value, err := util.SysReadFile(name)
105 if err != nil {
106 continue
107 }
108 vp := util.NewValueParser(value)
109
110 switch f.Name() {
111 case "admin_reserve_kbytes":
112 vm.AdminReserveKbytes = vp.PInt64()
113 case "block_dump":
114 vm.BlockDump = vp.PInt64()
115 case "compact_unevictable_allowed":
116 vm.CompactUnevictableAllowed = vp.PInt64()
117 case "dirty_background_bytes":
118 vm.DirtyBackgroundBytes = vp.PInt64()
119 case "dirty_background_ratio":
120 vm.DirtyBackgroundRatio = vp.PInt64()
121 case "dirty_bytes":
122 vm.DirtyBytes = vp.PInt64()
123 case "dirty_expire_centisecs":
124 vm.DirtyExpireCentisecs = vp.PInt64()
125 case "dirty_ratio":
126 vm.DirtyRatio = vp.PInt64()
127 case "dirtytime_expire_seconds":
128 vm.DirtytimeExpireSeconds = vp.PInt64()
129 case "dirty_writeback_centisecs":
130 vm.DirtyWritebackCentisecs = vp.PInt64()
131 case "drop_caches":
132 vm.DropCaches = vp.PInt64()
133 case "extfrag_threshold":
134 vm.ExtfragThreshold = vp.PInt64()
135 case "hugetlb_shm_group":
136 vm.HugetlbShmGroup = vp.PInt64()
137 case "laptop_mode":
138 vm.LaptopMode = vp.PInt64()
139 case "legacy_va_layout":
140 vm.LegacyVaLayout = vp.PInt64()
141 case "lowmem_reserve_ratio":
142 stringSlice := strings.Fields(value)
143 pint64Slice := make([]*int64, 0, len(stringSlice))
144 for _, value := range stringSlice {
145 vp := util.NewValueParser(value)
146 pint64Slice = append(pint64Slice, vp.PInt64())
147 }
148 vm.LowmemReserveRatio = pint64Slice
149 case "max_map_count":
150 vm.MaxMapCount = vp.PInt64()
151 case "memory_failure_early_kill":
152 vm.MemoryFailureEarlyKill = vp.PInt64()
153 case "memory_failure_recovery":
154 vm.MemoryFailureRecovery = vp.PInt64()
155 case "min_free_kbytes":
156 vm.MinFreeKbytes = vp.PInt64()
157 case "min_slab_ratio":
158 vm.MinSlabRatio = vp.PInt64()
159 case "min_unmapped_ratio":
160 vm.MinUnmappedRatio = vp.PInt64()
161 case "mmap_min_addr":
162 vm.MmapMinAddr = vp.PInt64()
163 case "nr_hugepages":
164 vm.NrHugepages = vp.PInt64()
165 case "nr_hugepages_mempolicy":
166 vm.NrHugepagesMempolicy = vp.PInt64()
167 case "nr_overcommit_hugepages":
168 vm.NrOvercommitHugepages = vp.PInt64()
169 case "numa_stat":
170 vm.NumaStat = vp.PInt64()
171 case "numa_zonelist_order":
172 vm.NumaZonelistOrder = value
173 case "oom_dump_tasks":
174 vm.OomDumpTasks = vp.PInt64()
175 case "oom_kill_allocating_task":
176 vm.OomKillAllocatingTask = vp.PInt64()
177 case "overcommit_kbytes":
178 vm.OvercommitKbytes = vp.PInt64()
179 case "overcommit_memory":
180 vm.OvercommitMemory = vp.PInt64()
181 case "overcommit_ratio":
182 vm.OvercommitRatio = vp.PInt64()
183 case "page-cluster":
184 vm.PageCluster = vp.PInt64()
185 case "panic_on_oom":
186 vm.PanicOnOom = vp.PInt64()
187 case "percpu_pagelist_fraction":
188 vm.PercpuPagelistFraction = vp.PInt64()
189 case "stat_interval":
190 vm.StatInterval = vp.PInt64()
191 case "swappiness":
192 vm.Swappiness = vp.PInt64()
193 case "user_reserve_kbytes":
194 vm.UserReserveKbytes = vp.PInt64()
195 case "vfs_cache_pressure":
196 vm.VfsCachePressure = vp.PInt64()
197 case "watermark_boost_factor":
198 vm.WatermarkBoostFactor = vp.PInt64()
199 case "watermark_scale_factor":
200 vm.WatermarkScaleFactor = vp.PInt64()
201 case "zone_reclaim_mode":
202 vm.ZoneReclaimMode = vp.PInt64()
203 }
204 if err := vp.Err(); err != nil {
205 return nil, err
206 }
207 }
208
209 return &vm, nil
210}
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