// Copyright 2019 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. // +build !windows package procfs import ( "fmt" "io/ioutil" "os" "path/filepath" "strings" "github.com/prometheus/procfs/internal/util" ) // The VM interface is described at // https://www.kernel.org/doc/Documentation/sysctl/vm.txt // Each setting is exposed as a single file. // Each file contains one line with a single numerical value, except lowmem_reserve_ratio which holds an array // and numa_zonelist_order (deprecated) which is a string type VM struct { AdminReserveKbytes *int64 // /proc/sys/vm/admin_reserve_kbytes BlockDump *int64 // /proc/sys/vm/block_dump CompactUnevictableAllowed *int64 // /proc/sys/vm/compact_unevictable_allowed DirtyBackgroundBytes *int64 // /proc/sys/vm/dirty_background_bytes DirtyBackgroundRatio *int64 // /proc/sys/vm/dirty_background_ratio DirtyBytes *int64 // /proc/sys/vm/dirty_bytes DirtyExpireCentisecs *int64 // /proc/sys/vm/dirty_expire_centisecs DirtyRatio *int64 // /proc/sys/vm/dirty_ratio DirtytimeExpireSeconds *int64 // /proc/sys/vm/dirtytime_expire_seconds DirtyWritebackCentisecs *int64 // /proc/sys/vm/dirty_writeback_centisecs DropCaches *int64 // /proc/sys/vm/drop_caches ExtfragThreshold *int64 // /proc/sys/vm/extfrag_threshold HugetlbShmGroup *int64 // /proc/sys/vm/hugetlb_shm_group LaptopMode *int64 // /proc/sys/vm/laptop_mode LegacyVaLayout *int64 // /proc/sys/vm/legacy_va_layout LowmemReserveRatio []*int64 // /proc/sys/vm/lowmem_reserve_ratio MaxMapCount *int64 // /proc/sys/vm/max_map_count MemoryFailureEarlyKill *int64 // /proc/sys/vm/memory_failure_early_kill MemoryFailureRecovery *int64 // /proc/sys/vm/memory_failure_recovery MinFreeKbytes *int64 // /proc/sys/vm/min_free_kbytes MinSlabRatio *int64 // /proc/sys/vm/min_slab_ratio MinUnmappedRatio *int64 // /proc/sys/vm/min_unmapped_ratio MmapMinAddr *int64 // /proc/sys/vm/mmap_min_addr NrHugepages *int64 // /proc/sys/vm/nr_hugepages NrHugepagesMempolicy *int64 // /proc/sys/vm/nr_hugepages_mempolicy NrOvercommitHugepages *int64 // /proc/sys/vm/nr_overcommit_hugepages NumaStat *int64 // /proc/sys/vm/numa_stat NumaZonelistOrder string // /proc/sys/vm/numa_zonelist_order OomDumpTasks *int64 // /proc/sys/vm/oom_dump_tasks OomKillAllocatingTask *int64 // /proc/sys/vm/oom_kill_allocating_task OvercommitKbytes *int64 // /proc/sys/vm/overcommit_kbytes OvercommitMemory *int64 // /proc/sys/vm/overcommit_memory OvercommitRatio *int64 // /proc/sys/vm/overcommit_ratio PageCluster *int64 // /proc/sys/vm/page-cluster PanicOnOom *int64 // /proc/sys/vm/panic_on_oom PercpuPagelistFraction *int64 // /proc/sys/vm/percpu_pagelist_fraction StatInterval *int64 // /proc/sys/vm/stat_interval Swappiness *int64 // /proc/sys/vm/swappiness UserReserveKbytes *int64 // /proc/sys/vm/user_reserve_kbytes VfsCachePressure *int64 // /proc/sys/vm/vfs_cache_pressure WatermarkBoostFactor *int64 // /proc/sys/vm/watermark_boost_factor WatermarkScaleFactor *int64 // /proc/sys/vm/watermark_scale_factor ZoneReclaimMode *int64 // /proc/sys/vm/zone_reclaim_mode } // VM reads the VM statistics from the specified `proc` filesystem. func (fs FS) VM() (*VM, error) { path := fs.proc.Path("sys/vm") file, err := os.Stat(path) if err != nil { return nil, err } if !file.Mode().IsDir() { return nil, fmt.Errorf("%s is not a directory", path) } files, err := ioutil.ReadDir(path) if err != nil { return nil, err } var vm VM for _, f := range files { if f.IsDir() { continue } name := filepath.Join(path, f.Name()) // ignore errors on read, as there are some write only // in /proc/sys/vm value, err := util.SysReadFile(name) if err != nil { continue } vp := util.NewValueParser(value) switch f.Name() { case "admin_reserve_kbytes": vm.AdminReserveKbytes = vp.PInt64() case "block_dump": vm.BlockDump = vp.PInt64() case "compact_unevictable_allowed": vm.CompactUnevictableAllowed = vp.PInt64() case "dirty_background_bytes": vm.DirtyBackgroundBytes = vp.PInt64() case "dirty_background_ratio": vm.DirtyBackgroundRatio = vp.PInt64() case "dirty_bytes": vm.DirtyBytes = vp.PInt64() case "dirty_expire_centisecs": vm.DirtyExpireCentisecs = vp.PInt64() case "dirty_ratio": vm.DirtyRatio = vp.PInt64() case "dirtytime_expire_seconds": vm.DirtytimeExpireSeconds = vp.PInt64() case "dirty_writeback_centisecs": vm.DirtyWritebackCentisecs = vp.PInt64() case "drop_caches": vm.DropCaches = vp.PInt64() case "extfrag_threshold": vm.ExtfragThreshold = vp.PInt64() case "hugetlb_shm_group": vm.HugetlbShmGroup = vp.PInt64() case "laptop_mode": vm.LaptopMode = vp.PInt64() case "legacy_va_layout": vm.LegacyVaLayout = vp.PInt64() case "lowmem_reserve_ratio": stringSlice := strings.Fields(value) pint64Slice := make([]*int64, 0, len(stringSlice)) for _, value := range stringSlice { vp := util.NewValueParser(value) pint64Slice = append(pint64Slice, vp.PInt64()) } vm.LowmemReserveRatio = pint64Slice case "max_map_count": vm.MaxMapCount = vp.PInt64() case "memory_failure_early_kill": vm.MemoryFailureEarlyKill = vp.PInt64() case "memory_failure_recovery": vm.MemoryFailureRecovery = vp.PInt64() case "min_free_kbytes": vm.MinFreeKbytes = vp.PInt64() case "min_slab_ratio": vm.MinSlabRatio = vp.PInt64() case "min_unmapped_ratio": vm.MinUnmappedRatio = vp.PInt64() case "mmap_min_addr": vm.MmapMinAddr = vp.PInt64() case "nr_hugepages": vm.NrHugepages = vp.PInt64() case "nr_hugepages_mempolicy": vm.NrHugepagesMempolicy = vp.PInt64() case "nr_overcommit_hugepages": vm.NrOvercommitHugepages = vp.PInt64() case "numa_stat": vm.NumaStat = vp.PInt64() case "numa_zonelist_order": vm.NumaZonelistOrder = value case "oom_dump_tasks": vm.OomDumpTasks = vp.PInt64() case "oom_kill_allocating_task": vm.OomKillAllocatingTask = vp.PInt64() case "overcommit_kbytes": vm.OvercommitKbytes = vp.PInt64() case "overcommit_memory": vm.OvercommitMemory = vp.PInt64() case "overcommit_ratio": vm.OvercommitRatio = vp.PInt64() case "page-cluster": vm.PageCluster = vp.PInt64() case "panic_on_oom": vm.PanicOnOom = vp.PInt64() case "percpu_pagelist_fraction": vm.PercpuPagelistFraction = vp.PInt64() case "stat_interval": vm.StatInterval = vp.PInt64() case "swappiness": vm.Swappiness = vp.PInt64() case "user_reserve_kbytes": vm.UserReserveKbytes = vp.PInt64() case "vfs_cache_pressure": vm.VfsCachePressure = vp.PInt64() case "watermark_boost_factor": vm.WatermarkBoostFactor = vp.PInt64() case "watermark_scale_factor": vm.WatermarkScaleFactor = vp.PInt64() case "zone_reclaim_mode": vm.ZoneReclaimMode = vp.PInt64() } if err := vp.Err(); err != nil { return nil, err } } return &vm, nil }