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210 lines
7.7 KiB
210 lines
7.7 KiB
// Copyright 2019 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !windows
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package procfs
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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// The VM interface is described at
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// https://www.kernel.org/doc/Documentation/sysctl/vm.txt
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// Each setting is exposed as a single file.
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// Each file contains one line with a single numerical value, except lowmem_reserve_ratio which holds an array
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// and numa_zonelist_order (deprecated) which is a string
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type VM struct {
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AdminReserveKbytes *int64 // /proc/sys/vm/admin_reserve_kbytes
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BlockDump *int64 // /proc/sys/vm/block_dump
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CompactUnevictableAllowed *int64 // /proc/sys/vm/compact_unevictable_allowed
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DirtyBackgroundBytes *int64 // /proc/sys/vm/dirty_background_bytes
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DirtyBackgroundRatio *int64 // /proc/sys/vm/dirty_background_ratio
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DirtyBytes *int64 // /proc/sys/vm/dirty_bytes
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DirtyExpireCentisecs *int64 // /proc/sys/vm/dirty_expire_centisecs
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DirtyRatio *int64 // /proc/sys/vm/dirty_ratio
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DirtytimeExpireSeconds *int64 // /proc/sys/vm/dirtytime_expire_seconds
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DirtyWritebackCentisecs *int64 // /proc/sys/vm/dirty_writeback_centisecs
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DropCaches *int64 // /proc/sys/vm/drop_caches
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ExtfragThreshold *int64 // /proc/sys/vm/extfrag_threshold
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HugetlbShmGroup *int64 // /proc/sys/vm/hugetlb_shm_group
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LaptopMode *int64 // /proc/sys/vm/laptop_mode
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LegacyVaLayout *int64 // /proc/sys/vm/legacy_va_layout
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LowmemReserveRatio []*int64 // /proc/sys/vm/lowmem_reserve_ratio
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MaxMapCount *int64 // /proc/sys/vm/max_map_count
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MemoryFailureEarlyKill *int64 // /proc/sys/vm/memory_failure_early_kill
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MemoryFailureRecovery *int64 // /proc/sys/vm/memory_failure_recovery
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MinFreeKbytes *int64 // /proc/sys/vm/min_free_kbytes
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MinSlabRatio *int64 // /proc/sys/vm/min_slab_ratio
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MinUnmappedRatio *int64 // /proc/sys/vm/min_unmapped_ratio
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MmapMinAddr *int64 // /proc/sys/vm/mmap_min_addr
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NrHugepages *int64 // /proc/sys/vm/nr_hugepages
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NrHugepagesMempolicy *int64 // /proc/sys/vm/nr_hugepages_mempolicy
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NrOvercommitHugepages *int64 // /proc/sys/vm/nr_overcommit_hugepages
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NumaStat *int64 // /proc/sys/vm/numa_stat
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NumaZonelistOrder string // /proc/sys/vm/numa_zonelist_order
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OomDumpTasks *int64 // /proc/sys/vm/oom_dump_tasks
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OomKillAllocatingTask *int64 // /proc/sys/vm/oom_kill_allocating_task
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OvercommitKbytes *int64 // /proc/sys/vm/overcommit_kbytes
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OvercommitMemory *int64 // /proc/sys/vm/overcommit_memory
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OvercommitRatio *int64 // /proc/sys/vm/overcommit_ratio
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PageCluster *int64 // /proc/sys/vm/page-cluster
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PanicOnOom *int64 // /proc/sys/vm/panic_on_oom
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PercpuPagelistFraction *int64 // /proc/sys/vm/percpu_pagelist_fraction
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StatInterval *int64 // /proc/sys/vm/stat_interval
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Swappiness *int64 // /proc/sys/vm/swappiness
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UserReserveKbytes *int64 // /proc/sys/vm/user_reserve_kbytes
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VfsCachePressure *int64 // /proc/sys/vm/vfs_cache_pressure
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WatermarkBoostFactor *int64 // /proc/sys/vm/watermark_boost_factor
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WatermarkScaleFactor *int64 // /proc/sys/vm/watermark_scale_factor
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ZoneReclaimMode *int64 // /proc/sys/vm/zone_reclaim_mode
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}
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// VM reads the VM statistics from the specified `proc` filesystem.
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func (fs FS) VM() (*VM, error) {
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path := fs.proc.Path("sys/vm")
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file, err := os.Stat(path)
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if err != nil {
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return nil, err
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}
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if !file.Mode().IsDir() {
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return nil, fmt.Errorf("%s is not a directory", path)
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}
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files, err := ioutil.ReadDir(path)
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if err != nil {
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return nil, err
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}
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var vm VM
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for _, f := range files {
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if f.IsDir() {
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continue
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}
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name := filepath.Join(path, f.Name())
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// ignore errors on read, as there are some write only
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// in /proc/sys/vm
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value, err := util.SysReadFile(name)
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if err != nil {
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continue
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}
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vp := util.NewValueParser(value)
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switch f.Name() {
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case "admin_reserve_kbytes":
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vm.AdminReserveKbytes = vp.PInt64()
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case "block_dump":
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vm.BlockDump = vp.PInt64()
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case "compact_unevictable_allowed":
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vm.CompactUnevictableAllowed = vp.PInt64()
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case "dirty_background_bytes":
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vm.DirtyBackgroundBytes = vp.PInt64()
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case "dirty_background_ratio":
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vm.DirtyBackgroundRatio = vp.PInt64()
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case "dirty_bytes":
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vm.DirtyBytes = vp.PInt64()
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case "dirty_expire_centisecs":
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vm.DirtyExpireCentisecs = vp.PInt64()
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case "dirty_ratio":
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vm.DirtyRatio = vp.PInt64()
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case "dirtytime_expire_seconds":
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vm.DirtytimeExpireSeconds = vp.PInt64()
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case "dirty_writeback_centisecs":
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vm.DirtyWritebackCentisecs = vp.PInt64()
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case "drop_caches":
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vm.DropCaches = vp.PInt64()
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case "extfrag_threshold":
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vm.ExtfragThreshold = vp.PInt64()
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case "hugetlb_shm_group":
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vm.HugetlbShmGroup = vp.PInt64()
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case "laptop_mode":
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vm.LaptopMode = vp.PInt64()
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case "legacy_va_layout":
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vm.LegacyVaLayout = vp.PInt64()
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case "lowmem_reserve_ratio":
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stringSlice := strings.Fields(value)
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pint64Slice := make([]*int64, 0, len(stringSlice))
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for _, value := range stringSlice {
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vp := util.NewValueParser(value)
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pint64Slice = append(pint64Slice, vp.PInt64())
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}
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vm.LowmemReserveRatio = pint64Slice
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case "max_map_count":
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vm.MaxMapCount = vp.PInt64()
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case "memory_failure_early_kill":
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vm.MemoryFailureEarlyKill = vp.PInt64()
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case "memory_failure_recovery":
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vm.MemoryFailureRecovery = vp.PInt64()
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case "min_free_kbytes":
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vm.MinFreeKbytes = vp.PInt64()
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case "min_slab_ratio":
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vm.MinSlabRatio = vp.PInt64()
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case "min_unmapped_ratio":
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vm.MinUnmappedRatio = vp.PInt64()
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case "mmap_min_addr":
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vm.MmapMinAddr = vp.PInt64()
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case "nr_hugepages":
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vm.NrHugepages = vp.PInt64()
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case "nr_hugepages_mempolicy":
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vm.NrHugepagesMempolicy = vp.PInt64()
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case "nr_overcommit_hugepages":
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vm.NrOvercommitHugepages = vp.PInt64()
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case "numa_stat":
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vm.NumaStat = vp.PInt64()
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case "numa_zonelist_order":
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vm.NumaZonelistOrder = value
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case "oom_dump_tasks":
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vm.OomDumpTasks = vp.PInt64()
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case "oom_kill_allocating_task":
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vm.OomKillAllocatingTask = vp.PInt64()
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case "overcommit_kbytes":
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vm.OvercommitKbytes = vp.PInt64()
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case "overcommit_memory":
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vm.OvercommitMemory = vp.PInt64()
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case "overcommit_ratio":
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vm.OvercommitRatio = vp.PInt64()
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case "page-cluster":
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vm.PageCluster = vp.PInt64()
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case "panic_on_oom":
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vm.PanicOnOom = vp.PInt64()
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case "percpu_pagelist_fraction":
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vm.PercpuPagelistFraction = vp.PInt64()
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case "stat_interval":
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vm.StatInterval = vp.PInt64()
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case "swappiness":
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vm.Swappiness = vp.PInt64()
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case "user_reserve_kbytes":
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vm.UserReserveKbytes = vp.PInt64()
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case "vfs_cache_pressure":
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vm.VfsCachePressure = vp.PInt64()
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case "watermark_boost_factor":
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vm.WatermarkBoostFactor = vp.PInt64()
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case "watermark_scale_factor":
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vm.WatermarkScaleFactor = vp.PInt64()
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case "zone_reclaim_mode":
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vm.ZoneReclaimMode = vp.PInt64()
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}
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if err := vp.Err(); err != nil {
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return nil, err
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}
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}
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return &vm, nil
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}
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