procfs

package module
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 Go to latest Published: Jan 6, 2022 License: Apache-2.0 Imports: 18 Imported by: 1

README

procfs

This package provides functions to retrieve system, kernel, and process metrics from the pseudo-filesystems /proc and /sys.

WARNING: This package is a work in progress. Its API may still break in backwards-incompatible ways without warnings. Use it at your own risk.

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Usage

The procfs library is organized by packages based on whether the gathered data is coming from /proc, /sys, or both. Each package contains an FS type which represents the path to either /proc, /sys, or both. For example, cpu statistics are gathered from /proc/stat and are available via the root procfs package. First, the proc filesystem mount point is initialized, and then the stat information is read.

fs, err := procfs.NewFS("/proc")
stats, err := fs.Stat()

Some sub-packages such as blockdevice, require access to both the proc and sys filesystems.

    fs, err := blockdevice.NewFS("/proc", "/sys")
    stats, err := fs.ProcDiskstats()

Package Organization

The packages in this project are organized according to (1) whether the data comes from the /proc or /sys filesystem and (2) the type of information being retrieved. For example, most process information can be gathered from the functions in the root procfs package. Information about block devices such as disk drives is available in the blockdevices sub-package.

Building and Testing

The procfs library is intended to be built as part of another application, so there are no distributable binaries.
However, most of the API includes unit tests which can be run with make test.

Updating Test Fixtures

The procfs library includes a set of test fixtures which include many example files from the /proc and /sys filesystems. These fixtures are included as a ttar file which is extracted automatically during testing. To add/update the test fixtures, first ensure the fixtures directory is up to date by removing the existing directory and then extracting the ttar file using make fixtures/.unpacked or just make test.

rm -rf fixtures
make test

Next, make the required changes to the extracted files in the fixtures directory. When the changes are complete, run make update_fixtures to create a new fixtures.ttar file based on the updated fixtures directory. And finally, verify the changes using git diff fixtures.ttar.

Documentation

Overview

Package procfs provides functions to retrieve system, kernel and process metrics from the pseudo-filesystem proc.

Example: 

package main

import (
	"fmt"
	"log"

	"github.com/iskylite/procfs"
)

func main() {
	p, err := procfs.Self()
	if err != nil {
		log.Fatalf("could not get process: %s", err)
	}

	stat, err := p.Stat()
	if err != nil {
		log.Fatalf("could not get process stat: %s", err)
	}

	fmt.Printf("command:  %s\n", stat.Comm)
	fmt.Printf("cpu time: %fs\n", stat.CPUTime())
	fmt.Printf("vsize:    %dB\n", stat.VirtualMemory())
	fmt.Printf("rss:      %dB\n", stat.ResidentMemory())
}

Index

Constants

View Source 
const (
	// completed entry (ha valid)
	ATFComplete = 0x02
	// permanent entry
	ATFPermanent = 0x04
	// Publish entry
	ATFPublish = 0x08
	// Has requested trailers
	ATFUseTrailers = 0x10
	// Obsoleted: Want to use a netmask (only for proxy entries)
	ATFNetmask = 0x20
	// Don't answer this addresses
	ATFDontPublish = 0x40
)

Learned from include/uapi/linux/if_arp.h

View Source 
const DefaultMountPoint = fs.DefaultProcMountPoint

DefaultMountPoint is the common mount point of the proc filesystem.

Variables

This section is empty.

Functions

This section is empty.

Types

type ARPEntry 

type ARPEntry struct {
	// IP address
	IPAddr net.IP
	// MAC address
	HWAddr net.HardwareAddr
	// Name of the device
	Device string
	// Flags
	Flags byte
}

ARPEntry contains a single row of the columnar data represented in /proc/net/arp.

func (*ARPEntry) IsComplete 

func (entry *ARPEntry) IsComplete() bool

IsComplete returns true if ARP entry is marked with complete flag

type BuddyInfo 

type BuddyInfo struct {
	Node  string
	Zone  string
	Sizes []float64
}

A BuddyInfo is the details parsed from /proc/buddyinfo. The data is comprised of an array of free fragments of each size. The sizes are 2^n*PAGE_SIZE, where n is the array index.

type CPUInfo 

type CPUInfo struct {
	Processor       uint
	VendorID        string
	CPUFamily       string
	Model           string
	ModelName       string
	Stepping        string
	Microcode       string
	CPUMHz          float64
	CacheSize       string
	PhysicalID      string
	Siblings        uint
	CoreID          string
	CPUCores        uint
	APICID          string
	InitialAPICID   string
	FPU             string
	FPUException    string
	CPUIDLevel      uint
	WP              string
	Flags           []string
	Bugs            []string
	BogoMips        float64
	CLFlushSize     uint
	CacheAlignment  uint
	AddressSizes    string
	PowerManagement string
}

CPUInfo contains general information about a system CPU found in /proc/cpuinfo

type CPUStat 

type CPUStat struct {
	User      float64
	Nice      float64
	System    float64
	Idle      float64
	Iowait    float64
	IRQ       float64
	SoftIRQ   float64
	Steal     float64
	Guest     float64
	GuestNice float64
}

CPUStat shows how much time the cpu spend in various stages.

type Cgroup 

type Cgroup struct {
	// HierarchyID that can be matched to a named hierarchy using /proc/cgroups. Cgroups V2 only has one
	// hierarchy, so HierarchyID is always 0. For cgroups v1 this is a unique ID number
	HierarchyID int
	// Controllers using this hierarchy of processes. Controllers are also known as subsystems. For
	// Cgroups V2 this may be empty, as all active controllers use the same hierarchy
	Controllers []string
	// Path of this control group, relative to the mount point of the cgroupfs representing this specific
	// hierarchy
	Path string
}

Cgroup models one line from /proc/[pid]/cgroup. Each Cgroup struct describes the the placement of a PID inside a specific control hierarchy. The kernel has two cgroup APIs, v1 and v2. v1 has one hierarchy per available resource controller, while v2 has one unified hierarchy shared by all controllers. Regardless of v1 or v2, all hierarchies contain all running processes, so the question answerable with a Cgroup struct is 'where is this process in this hierarchy' (where==what path on the specific cgroupfs). By prefixing this path with the mount point of *this specific* hierarchy, you can locate the relevant pseudo-files needed to read/set the data for this PID in this hierarchy

Also see http://man7.org/linux/man-pages/man7/cgroups.7.html

type ConntrackStatEntry 

type ConntrackStatEntry struct {
	Entries       uint64
	Found         uint64
	Invalid       uint64
	Ignore        uint64
	Insert        uint64
	InsertFailed  uint64
	Drop          uint64
	EarlyDrop     uint64
	SearchRestart uint64
}

A ConntrackStatEntry represents one line from net/stat/nf_conntrack and contains netfilter conntrack statistics at one CPU core

type Crypto 

type Crypto struct {
	Alignmask   *uint64
	Async       bool
	Blocksize   *uint64
	Chunksize   *uint64
	Ctxsize     *uint64
	Digestsize  *uint64
	Driver      string
	Geniv       string
	Internal    string
	Ivsize      *uint64
	Maxauthsize *uint64
	MaxKeysize  *uint64
	MinKeysize  *uint64
	Module      string
	Name        string
	Priority    *int64
	Refcnt      *int64
	Seedsize    *uint64
	Selftest    string
	Type        string
	Walksize    *uint64
}

Crypto holds info parsed from /proc/crypto.

type FS 

type FS struct {
	// contains filtered or unexported fields
}

FS represents the pseudo-filesystem sys, which provides an interface to kernel data structures.

func NewDefaultFS 

func NewDefaultFS() (FS, error)

NewDefaultFS returns a new proc FS mounted under the default proc mountPoint. It will error if the mount point directory can't be read or is a file.

func NewFS 

func NewFS(mountPoint string) (FS, error)

NewFS returns a new proc FS mounted under the given proc mountPoint. It will error if the mount point directory can't be read or is a file.

func (FS) AllProcs 

func (fs FS) AllProcs() (Procs, error)

AllProcs returns a list of all currently available processes.

func (FS) BuddyInfo 

func (fs FS) BuddyInfo() ([]BuddyInfo, error)

BuddyInfo reads the buddyinfo statistics from the specified `proc` filesystem.

func (FS) CPUInfo 

func (fs FS) CPUInfo() ([]CPUInfo, error)

CPUInfo returns information about current system CPUs. See https://www.kernel.org/doc/Documentation/filesystems/proc.txt

func (FS) CmdLine 

func (fs FS) CmdLine() ([]string, error)

CmdLine returns the command line of the kernel.

func (FS) ConntrackStat 

func (fs FS) ConntrackStat() ([]ConntrackStatEntry, error)

ConntrackStat retrieves netfilter's conntrack statistics, split by CPU cores

func (FS) Crypto 

func (fs FS) Crypto() ([]Crypto, error)

Crypto parses an crypto-file (/proc/crypto) and returns a slice of structs containing the relevant info. More information available here: https://kernel.readthedocs.io/en/sphinx-samples/crypto-API.html

func (FS) Fscacheinfo 

func (fs FS) Fscacheinfo() (Fscacheinfo, error)

Fscacheinfo returns information about current fscache statistics. See https://www.kernel.org/doc/Documentation/filesystems/caching/fscache.txt

func (FS) GatherARPEntries 

func (fs FS) GatherARPEntries() ([]ARPEntry, error)

GatherARPEntries retrieves all the ARP entries, parse the relevant columns, and then return a slice of ARPEntry's.

func (FS) IPVSBackendStatus 

func (fs FS) IPVSBackendStatus() ([]IPVSBackendStatus, error)

IPVSBackendStatus reads and returns the status of all (virtual,real) server pairs from the specified `proc` filesystem.

func (FS) IPVSStats 

func (fs FS) IPVSStats() (IPVSStats, error)

IPVSStats reads the IPVS statistics from the specified `proc` filesystem.

func (FS) KernelRandom 

func (fs FS) KernelRandom() (KernelRandom, error)

KernelRandom returns values from /proc/sys/kernel/random.

func (FS) LoadAvg 

func (fs FS) LoadAvg() (*LoadAvg, error)

LoadAvg returns loadavg from /proc.

func (FS) MDStat 

func (fs FS) MDStat() ([]MDStat, error)

MDStat parses an mdstat-file (/proc/mdstat) and returns a slice of structs containing the relevant info. More information available here: https://raid.wiki.kernel.org/index.php/Mdstat

func (FS) Meminfo 

func (fs FS) Meminfo() (Meminfo, error)

Meminfo returns an information about current kernel/system memory statistics. See https://www.kernel.org/doc/Documentation/filesystems/proc.txt

func (FS) NetDev 

func (fs FS) NetDev() (NetDev, error)

NetDev returns kernel/system statistics read from /proc/net/dev.

func (FS) NetProtocols 

func (fs FS) NetProtocols() (NetProtocolStats, error)

NetProtocols reads stats from /proc/net/protocols and returns a map of PortocolStatLine entries. As of this writing no official Linux Documentation exists, however the source is fairly self-explanatory and the format seems stable since its introduction in 2.6.12-rc2 Linux 2.6.12-rc2 - https://elixir.bootlin.com/linux/v2.6.12-rc2/source/net/core/sock.c#L1452 Linux 5.10 - https://elixir.bootlin.com/linux/v5.10.4/source/net/core/sock.c#L3586

func (FS) NetSockstat 

func (fs FS) NetSockstat() (*NetSockstat, error)

NetSockstat retrieves IPv4 socket statistics.

func (FS) NetSockstat6 

func (fs FS) NetSockstat6() (*NetSockstat, error)

NetSockstat6 retrieves IPv6 socket statistics.

If IPv6 is disabled on this kernel, the returned error can be checked with os.IsNotExist.

func (FS) NetSoftnetStat 

func (fs FS) NetSoftnetStat() ([]SoftnetStat, error)

NetSoftnetStat reads data from /proc/net/softnet_stat.

func (FS) NetStat 

func (fs FS) NetStat() ([]NetStat, error)

NetStat retrieves stats from /proc/net/stat/

func (FS) NetTCP 

func (fs FS) NetTCP() (NetTCP, error)

NetTCP returns the IPv4 kernel/networking statistics for TCP datagrams read from /proc/net/tcp.

func (FS) NetTCP6 

func (fs FS) NetTCP6() (NetTCP, error)

NetTCP6 returns the IPv6 kernel/networking statistics for TCP datagrams read from /proc/net/tcp6.

func (FS) NetTCP6Summary 

func (fs FS) NetTCP6Summary() (*NetTCPSummary, error)

NetTCP6Summary returns already computed statistics like the total queue lengths for TCP datagrams read from /proc/net/tcp6.

func (FS) NetTCPSummary 

func (fs FS) NetTCPSummary() (*NetTCPSummary, error)

NetTCPSummary returns already computed statistics like the total queue lengths for TCP datagrams read from /proc/net/tcp.

func (FS) NetUDP 

func (fs FS) NetUDP() (NetUDP, error)

NetUDP returns the IPv4 kernel/networking statistics for UDP datagrams read from /proc/net/udp.

func (FS) NetUDP6 

func (fs FS) NetUDP6() (NetUDP, error)

NetUDP6 returns the IPv6 kernel/networking statistics for UDP datagrams read from /proc/net/udp6.

func (FS) NetUDP6Summary 

func (fs FS) NetUDP6Summary() (*NetUDPSummary, error)

NetUDP6Summary returns already computed statistics like the total queue lengths for UDP datagrams read from /proc/net/udp6.

func (FS) NetUDPSummary 

func (fs FS) NetUDPSummary() (*NetUDPSummary, error)

NetUDPSummary returns already computed statistics like the total queue lengths for UDP datagrams read from /proc/net/udp.

func (FS) NetUNIX 

func (fs FS) NetUNIX() (*NetUNIX, error)

NetUNIX returns data read from /proc/net/unix.

func (FS) NewProc deprecated 

func (fs FS) NewProc(pid int) (Proc, error)

NewProc returns a process for the given pid.

Deprecated: use fs.Proc() instead

func (FS) NewStat deprecated 

func (fs FS) NewStat() (Stat, error)

NewStat returns information about current cpu/process statistics. See https://www.kernel.org/doc/Documentation/filesystems/proc.txt

Deprecated: use fs.Stat() instead

func (FS) NewXfrmStat 

func (fs FS) NewXfrmStat() (XfrmStat, error)

NewXfrmStat reads the xfrm_stat statistics from the 'proc' filesystem.

func (FS) PSIStatsForResource 

func (fs FS) PSIStatsForResource(resource string) (PSIStats, error)

PSIStatsForResource reads pressure stall information for the specified resource from /proc/pressure/<resource>. At time of writing this can be either "cpu", "memory" or "io".

func (FS) Proc 

func (fs FS) Proc(pid int) (Proc, error)

Proc returns a process for the given pid.

func (FS) Schedstat 

func (fs FS) Schedstat() (*Schedstat, error)

Schedstat reads data from /proc/schedstat

func (FS) Self 

func (fs FS) Self() (Proc, error)

Self returns a process for the current process.

func (FS) SlabInfo 

func (fs FS) SlabInfo() (SlabInfo, error)

SlabInfo reads data from /proc/slabinfo

func (FS) Stat 

func (fs FS) Stat() (Stat, error)

Stat returns information about current cpu/process statistics. See https://www.kernel.org/doc/Documentation/filesystems/proc.txt

func (FS) Swaps 

func (fs FS) Swaps() ([]*Swap, error)

Swaps returns a slice of all configured swap devices on the system.

func (FS) VM 

func (fs FS) VM() (*VM, error)

VM reads the VM statistics from the specified `proc` filesystem.

func (FS) Zoneinfo 

func (fs FS) Zoneinfo() ([]Zoneinfo, error)

Zoneinfo parses an zoneinfo-file (/proc/zoneinfo) and returns a slice of structs containing the relevant info. More information available here: https://www.kernel.org/doc/Documentation/sysctl/vm.txt

type Fscacheinfo 

type Fscacheinfo struct {
	// Number of index cookies allocated
	IndexCookiesAllocated uint64
	// data storage cookies allocated
	DataStorageCookiesAllocated uint64
	// Number of special cookies allocated
	SpecialCookiesAllocated uint64
	// Number of objects allocated
	ObjectsAllocated uint64
	// Number of object allocation failures
	ObjectAllocationsFailure uint64
	// Number of objects that reached the available state
	ObjectsAvailable uint64
	// Number of objects that reached the dead state
	ObjectsDead uint64
	// Number of objects that didn't have a coherency check
	ObjectsWithoutCoherencyCheck uint64
	// Number of objects that passed a coherency check
	ObjectsWithCoherencyCheck uint64
	// Number of objects that needed a coherency data update
	ObjectsNeedCoherencyCheckUpdate uint64
	// Number of objects that were declared obsolete
	ObjectsDeclaredObsolete uint64
	// Number of pages marked as being cached
	PagesMarkedAsBeingCached uint64
	// Number of uncache page requests seen
	UncachePagesRequestSeen uint64
	// Number of acquire cookie requests seen
	AcquireCookiesRequestSeen uint64
	// Number of acq reqs given a NULL parent
	AcquireRequestsWithNullParent uint64
	// Number of acq reqs rejected due to no cache available
	AcquireRequestsRejectedNoCacheAvailable uint64
	// Number of acq reqs succeeded
	AcquireRequestsSucceeded uint64
	// Number of acq reqs rejected due to error
	AcquireRequestsRejectedDueToError uint64
	// Number of acq reqs failed on ENOMEM
	AcquireRequestsFailedDueToEnomem uint64
	// Number of lookup calls made on cache backends
	LookupsNumber uint64
	// Number of negative lookups made
	LookupsNegative uint64
	// Number of positive lookups made
	LookupsPositive uint64
	// Number of objects created by lookup
	ObjectsCreatedByLookup uint64
	// Number of lookups timed out and requeued
	LookupsTimedOutAndRequed uint64
	InvalidationsNumber      uint64
	InvalidationsRunning     uint64
	// Number of update cookie requests seen
	UpdateCookieRequestSeen uint64
	// Number of upd reqs given a NULL parent
	UpdateRequestsWithNullParent uint64
	// Number of upd reqs granted CPU time
	UpdateRequestsRunning uint64
	// Number of relinquish cookie requests seen
	RelinquishCookiesRequestSeen uint64
	// Number of rlq reqs given a NULL parent
	RelinquishCookiesWithNullParent uint64
	// Number of rlq reqs waited on completion of creation
	RelinquishRequestsWaitingCompleteCreation uint64
	// Relinqs rtr
	RelinquishRetries uint64
	// Number of attribute changed requests seen
	AttributeChangedRequestsSeen uint64
	// Number of attr changed requests queued
	AttributeChangedRequestsQueued uint64
	// Number of attr changed rejected -ENOBUFS
	AttributeChangedRejectDueToEnobufs uint64
	// Number of attr changed failed -ENOMEM
	AttributeChangedFailedDueToEnomem uint64
	// Number of attr changed ops given CPU time
	AttributeChangedOps uint64
	// Number of allocation requests seen
	AllocationRequestsSeen uint64
	// Number of successful alloc reqs
	AllocationOkRequests uint64
	// Number of alloc reqs that waited on lookup completion
	AllocationWaitingOnLookup uint64
	// Number of alloc reqs rejected -ENOBUFS
	AllocationsRejectedDueToEnobufs uint64
	// Number of alloc reqs aborted -ERESTARTSYS
	AllocationsAbortedDueToErestartsys uint64
	// Number of alloc reqs submitted
	AllocationOperationsSubmitted uint64
	// Number of alloc reqs waited for CPU time
	AllocationsWaitedForCPU uint64
	// Number of alloc reqs aborted due to object death
	AllocationsAbortedDueToObjectDeath uint64
	// Number of retrieval (read) requests seen
	RetrievalsReadRequests uint64
	// Number of successful retr reqs
	RetrievalsOk uint64
	// Number of retr reqs that waited on lookup completion
	RetrievalsWaitingLookupCompletion uint64
	// Number of retr reqs returned -ENODATA
	RetrievalsReturnedEnodata uint64
	// Number of retr reqs rejected -ENOBUFS
	RetrievalsRejectedDueToEnobufs uint64
	// Number of retr reqs aborted -ERESTARTSYS
	RetrievalsAbortedDueToErestartsys uint64
	// Number of retr reqs failed -ENOMEM
	RetrievalsFailedDueToEnomem uint64
	// Number of retr reqs submitted
	RetrievalsRequests uint64
	// Number of retr reqs waited for CPU time
	RetrievalsWaitingCPU uint64
	// Number of retr reqs aborted due to object death
	RetrievalsAbortedDueToObjectDeath uint64
	// Number of storage (write) requests seen
	StoreWriteRequests uint64
	// Number of successful store reqs
	StoreSuccessfulRequests uint64
	// Number of store reqs on a page already pending storage
	StoreRequestsOnPendingStorage uint64
	// Number of store reqs rejected -ENOBUFS
	StoreRequestsRejectedDueToEnobufs uint64
	// Number of store reqs failed -ENOMEM
	StoreRequestsFailedDueToEnomem uint64
	// Number of store reqs submitted
	StoreRequestsSubmitted uint64
	// Number of store reqs granted CPU time
	StoreRequestsRunning uint64
	// Number of pages given store req processing time
	StorePagesWithRequestsProcessing uint64
	// Number of store reqs deleted from tracking tree
	StoreRequestsDeleted uint64
	// Number of store reqs over store limit
	StoreRequestsOverStoreLimit uint64
	// Number of release reqs against pages with no pending store
	ReleaseRequestsAgainstPagesWithNoPendingStorage uint64
	// Number of release reqs against pages stored by time lock granted
	ReleaseRequestsAgainstPagesStoredByTimeLockGranted uint64
	// Number of release reqs ignored due to in-progress store
	ReleaseRequestsIgnoredDueToInProgressStore uint64
	// Number of page stores cancelled due to release req
	PageStoresCancelledByReleaseRequests uint64
	VmscanWaiting                        uint64
	// Number of times async ops added to pending queues
	OpsPending uint64
	// Number of times async ops given CPU time
	OpsRunning uint64
	// Number of times async ops queued for processing
	OpsEnqueued uint64
	// Number of async ops cancelled
	OpsCancelled uint64
	// Number of async ops rejected due to object lookup/create failure
	OpsRejected uint64
	// Number of async ops initialised
	OpsInitialised uint64
	// Number of async ops queued for deferred release
	OpsDeferred uint64
	// Number of async ops released (should equal ini=N when idle)
	OpsReleased uint64
	// Number of deferred-release async ops garbage collected
	OpsGarbageCollected uint64
	// Number of in-progress alloc_object() cache ops
	CacheopAllocationsinProgress uint64
	// Number of in-progress lookup_object() cache ops
	CacheopLookupObjectInProgress uint64
	// Number of in-progress lookup_complete() cache ops
	CacheopLookupCompleteInPorgress uint64
	// Number of in-progress grab_object() cache ops
	CacheopGrabObjectInProgress uint64
	CacheopInvalidations        uint64
	// Number of in-progress update_object() cache ops
	CacheopUpdateObjectInProgress uint64
	// Number of in-progress drop_object() cache ops
	CacheopDropObjectInProgress uint64
	// Number of in-progress put_object() cache ops
	CacheopPutObjectInProgress uint64
	// Number of in-progress attr_changed() cache ops
	CacheopAttributeChangeInProgress uint64
	// Number of in-progress sync_cache() cache ops
	CacheopSyncCacheInProgress uint64
	// Number of in-progress read_or_alloc_page() cache ops
	CacheopReadOrAllocPageInProgress uint64
	// Number of in-progress read_or_alloc_pages() cache ops
	CacheopReadOrAllocPagesInProgress uint64
	// Number of in-progress allocate_page() cache ops
	CacheopAllocatePageInProgress uint64
	// Number of in-progress allocate_pages() cache ops
	CacheopAllocatePagesInProgress uint64
	// Number of in-progress write_page() cache ops
	CacheopWritePagesInProgress uint64
	// Number of in-progress uncache_page() cache ops
	CacheopUncachePagesInProgress uint64
	// Number of in-progress dissociate_pages() cache ops
	CacheopDissociatePagesInProgress uint64
	// Number of object lookups/creations rejected due to lack of space
	CacheevLookupsAndCreationsRejectedLackSpace uint64
	// Number of stale objects deleted
	CacheevStaleObjectsDeleted uint64
	// Number of objects retired when relinquished
	CacheevRetiredWhenReliquished uint64
	// Number of objects culled
	CacheevObjectsCulled uint64
}

Fscacheinfo represents fscache statistics.

type IPVSBackendStatus 

type IPVSBackendStatus struct {
	// The local (virtual) IP address.
	LocalAddress net.IP
	// The remote (real) IP address.
	RemoteAddress net.IP
	// The local (virtual) port.
	LocalPort uint16
	// The remote (real) port.
	RemotePort uint16
	// The local firewall mark
	LocalMark string
	// The transport protocol (TCP, UDP).
	Proto string
	// The current number of active connections for this virtual/real address pair.
	ActiveConn uint64
	// The current number of inactive connections for this virtual/real address pair.
	InactConn uint64
	// The current weight of this virtual/real address pair.
	Weight uint64
}

IPVSBackendStatus holds current metrics of one virtual / real address pair.

type IPVSStats 

type IPVSStats struct {
	// Total count of connections.
	Connections uint64
	// Total incoming packages processed.
	IncomingPackets uint64
	// Total outgoing packages processed.
	OutgoingPackets uint64
	// Total incoming traffic.
	IncomingBytes uint64
	// Total outgoing traffic.
	OutgoingBytes uint64
}

IPVSStats holds IPVS statistics, as exposed by the kernel in `/proc/net/ip_vs_stats`.

type InotifyInfo 

type InotifyInfo struct {
	// Watch descriptor number
	WD string
	// Inode number
	Ino string
	// Device ID
	Sdev string
	// Mask of events being monitored
	Mask string
}

InotifyInfo represents a single inotify line in the fdinfo file.

type KernelRandom 

type KernelRandom struct {
	// EntropyAvaliable gives the available entropy, in bits.
	EntropyAvaliable *uint64
	// PoolSize gives the size of the entropy pool, in bits.
	PoolSize *uint64
	// URandomMinReseedSeconds is the number of seconds after which the DRNG will be reseeded.
	URandomMinReseedSeconds *uint64
	// WriteWakeupThreshold the number of bits of entropy below which we wake up processes
	// that do a select(2) or poll(2) for write access to /dev/random.
	WriteWakeupThreshold *uint64
	// ReadWakeupThreshold is the number of bits of entropy required for waking up processes that sleep
	// waiting for entropy from /dev/random.
	ReadWakeupThreshold *uint64
}

KernelRandom contains information about to the kernel's random number generator.

type LoadAvg 

type LoadAvg struct {
	Load1  float64
	Load5  float64
	Load15 float64
}

LoadAvg represents an entry in /proc/loadavg

type MDStat 

type MDStat struct {
	// Name of the device.
	Name string
	// activity-state of the device.
	ActivityState string
	// Number of active disks.
	DisksActive int64
	// Total number of disks the device requires.
	DisksTotal int64
	// Number of failed disks.
	DisksFailed int64
	// Number of "down" disks. (the _ indicator in the status line)
	DisksDown int64
	// Spare disks in the device.
	DisksSpare int64
	// Number of blocks the device holds.
	BlocksTotal int64
	// Number of blocks on the device that are in sync.
	BlocksSynced int64
	// progress percentage of current sync
	BlocksSyncedPct float64
	// estimated finishing time for current sync (in minutes)
	BlocksSyncedFinishTime float64
	// current sync speed (in Kilobytes/sec)
	BlocksSyncedSpeed float64
	// Name of md component devices
	Devices []string
}

MDStat holds info parsed from /proc/mdstat.

type Meminfo 

type Meminfo struct {
	// Total usable ram (i.e. physical ram minus a few reserved
	// bits and the kernel binary code)
	MemTotal *uint64
	// The sum of LowFree+HighFree
	MemFree *uint64
	// An estimate of how much memory is available for starting
	// new applications, without swapping. Calculated from
	// MemFree, SReclaimable, the size of the file LRU lists, and
	// the low watermarks in each zone.  The estimate takes into
	// account that the system needs some page cache to function
	// well, and that not all reclaimable slab will be
	// reclaimable, due to items being in use. The impact of those
	// factors will vary from system to system.
	MemAvailable *uint64
	// Relatively temporary storage for raw disk blocks shouldn't
	// get tremendously large (20MB or so)
	Buffers *uint64
	Cached  *uint64
	// Memory that once was swapped out, is swapped back in but
	// still also is in the swapfile (if memory is needed it
	// doesn't need to be swapped out AGAIN because it is already
	// in the swapfile. This saves I/O)
	SwapCached *uint64
	// Memory that has been used more recently and usually not
	// reclaimed unless absolutely necessary.
	Active *uint64
	// Memory which has been less recently used.  It is more
	// eligible to be reclaimed for other purposes
	Inactive     *uint64
	ActiveAnon   *uint64
	InactiveAnon *uint64
	ActiveFile   *uint64
	InactiveFile *uint64
	Unevictable  *uint64
	Mlocked      *uint64
	// total amount of swap space available
	SwapTotal *uint64
	// Memory which has been evicted from RAM, and is temporarily
	// on the disk
	SwapFree *uint64
	// Memory which is waiting to get written back to the disk
	Dirty *uint64
	// Memory which is actively being written back to the disk
	Writeback *uint64
	// Non-file backed pages mapped into userspace page tables
	AnonPages *uint64
	// files which have been mapped, such as libraries
	Mapped *uint64
	Shmem  *uint64
	// in-kernel data structures cache
	Slab *uint64
	// Part of Slab, that might be reclaimed, such as caches
	SReclaimable *uint64
	// Part of Slab, that cannot be reclaimed on memory pressure
	SUnreclaim  *uint64
	KernelStack *uint64
	// amount of memory dedicated to the lowest level of page
	// tables.
	PageTables *uint64
	// NFS pages sent to the server, but not yet committed to
	// stable storage
	NFSUnstable *uint64
	// Memory used for block device "bounce buffers"
	Bounce *uint64
	// Memory used by FUSE for temporary writeback buffers
	WritebackTmp *uint64
	// Based on the overcommit ratio ('vm.overcommit_ratio'),
	// this is the total amount of  memory currently available to
	// be allocated on the system. This limit is only adhered to
	// if strict overcommit accounting is enabled (mode 2 in
	// 'vm.overcommit_memory').
	// The CommitLimit is calculated with the following formula:
	// CommitLimit = ([total RAM pages] - [total huge TLB pages]) *
	//                overcommit_ratio / 100 + [total swap pages]
	// For example, on a system with 1G of physical RAM and 7G
	// of swap with a `vm.overcommit_ratio` of 30 it would
	// yield a CommitLimit of 7.3G.
	// For more details, see the memory overcommit documentation
	// in vm/overcommit-accounting.
	CommitLimit *uint64
	// The amount of memory presently allocated on the system.
	// The committed memory is a sum of all of the memory which
	// has been allocated by processes, even if it has not been
	// "used" by them as of yet. A process which malloc()'s 1G
	// of memory, but only touches 300M of it will show up as
	// using 1G. This 1G is memory which has been "committed" to
	// by the VM and can be used at any time by the allocating
	// application. With strict overcommit enabled on the system
	// (mode 2 in 'vm.overcommit_memory'),allocations which would
	// exceed the CommitLimit (detailed above) will not be permitted.
	// This is useful if one needs to guarantee that processes will
	// not fail due to lack of memory once that memory has been
	// successfully allocated.
	CommittedAS *uint64
	// total size of vmalloc memory area
	VmallocTotal *uint64
	// amount of vmalloc area which is used
	VmallocUsed *uint64
	// largest contiguous block of vmalloc area which is free
	VmallocChunk      *uint64
	HardwareCorrupted *uint64
	AnonHugePages     *uint64
	ShmemHugePages    *uint64
	ShmemPmdMapped    *uint64
	CmaTotal          *uint64
	CmaFree           *uint64
	HugePagesTotal    *uint64
	HugePagesFree     *uint64
	HugePagesRsvd     *uint64
	HugePagesSurp     *uint64
	Hugepagesize      *uint64
	DirectMap4k       *uint64
	DirectMap2M       *uint64
	DirectMap1G       *uint64
}

Meminfo represents memory statistics.

type Mount 

type Mount struct {
	// Name of the device.
	Device string
	// The mount point of the device.
	Mount string
	// The filesystem type used by the device.
	Type string
	// If available additional statistics related to this Mount.
	// Use a type assertion to determine if additional statistics are available.
	Stats MountStats
}

A Mount is a device mount parsed from /proc/[pid]/mountstats.

type MountInfo 

type MountInfo struct {
	// Unique ID for the mount
	MountID int
	// The ID of the parent mount
	ParentID int
	// The value of `st_dev` for the files on this FS
	MajorMinorVer string
	// The pathname of the directory in the FS that forms
	// the root for this mount
	Root string
	// The pathname of the mount point relative to the root
	MountPoint string
	// Mount options
	Options map[string]string
	// Zero or more optional fields
	OptionalFields map[string]string
	// The Filesystem type
	FSType string
	// FS specific information or "none"
	Source string
	// Superblock options
	SuperOptions map[string]string
}

A MountInfo is a type that describes the details, options for each mount, parsed from /proc/self/mountinfo. The fields described in each entry of /proc/self/mountinfo is described in the following man page. http://man7.org/linux/man-pages/man5/proc.5.html

func GetMounts 

func GetMounts() ([]*MountInfo, error)

GetMounts retrieves mountinfo information from `/proc/self/mountinfo`.

func GetProcMounts 

func GetProcMounts(pid int) ([]*MountInfo, error)

GetProcMounts retrieves mountinfo information from a processes' `/proc/<pid>/mountinfo`.

type MountStats 

type MountStats interface {
	// contains filtered or unexported methods
}

A MountStats is a type which contains detailed statistics for a specific type of Mount.

type MountStatsNFS 

type MountStatsNFS struct {
	// The version of statistics provided.
	StatVersion string
	// The mount options of the NFS mount.
	Opts map[string]string
	// The age of the NFS mount.
	Age time.Duration
	// Statistics related to byte counters for various operations.
	Bytes NFSBytesStats
	// Statistics related to various NFS event occurrences.
	Events NFSEventsStats
	// Statistics broken down by filesystem operation.
	Operations []NFSOperationStats
	// Statistics about the NFS RPC transport.
	Transport NFSTransportStats
}

A MountStatsNFS is a MountStats implementation for NFSv3 and v4 mounts.

type NFSBytesStats 

type NFSBytesStats struct {
	// Number of bytes read using the read() syscall.
	Read uint64
	// Number of bytes written using the write() syscall.
	Write uint64
	// Number of bytes read using the read() syscall in O_DIRECT mode.
	DirectRead uint64
	// Number of bytes written using the write() syscall in O_DIRECT mode.
	DirectWrite uint64
	// Number of bytes read from the NFS server, in total.
	ReadTotal uint64
	// Number of bytes written to the NFS server, in total.
	WriteTotal uint64
	// Number of pages read directly via mmap()'d files.
	ReadPages uint64
	// Number of pages written directly via mmap()'d files.
	WritePages uint64
}

A NFSBytesStats contains statistics about the number of bytes read and written by an NFS client to and from an NFS server.

type NFSEventsStats 

type NFSEventsStats struct {
	// Number of times cached inode attributes are re-validated from the server.
	InodeRevalidate uint64
	// Number of times cached dentry nodes are re-validated from the server.
	DnodeRevalidate uint64
	// Number of times an inode cache is cleared.
	DataInvalidate uint64
	// Number of times cached inode attributes are invalidated.
	AttributeInvalidate uint64
	// Number of times files or directories have been open()'d.
	VFSOpen uint64
	// Number of times a directory lookup has occurred.
	VFSLookup uint64
	// Number of times permissions have been checked.
	VFSAccess uint64
	// Number of updates (and potential writes) to pages.
	VFSUpdatePage uint64
	// Number of pages read directly via mmap()'d files.
	VFSReadPage uint64
	// Number of times a group of pages have been read.
	VFSReadPages uint64
	// Number of pages written directly via mmap()'d files.
	VFSWritePage uint64
	// Number of times a group of pages have been written.
	VFSWritePages uint64
	// Number of times directory entries have been read with getdents().
	VFSGetdents uint64
	// Number of times attributes have been set on inodes.
	VFSSetattr uint64
	// Number of pending writes that have been forcefully flushed to the server.
	VFSFlush uint64
	// Number of times fsync() has been called on directories and files.
	VFSFsync uint64
	// Number of times locking has been attempted on a file.
	VFSLock uint64
	// Number of times files have been closed and released.
	VFSFileRelease uint64
	// Unknown.  Possibly unused.
	CongestionWait uint64
	// Number of times files have been truncated.
	Truncation uint64
	// Number of times a file has been grown due to writes beyond its existing end.
	WriteExtension uint64
	// Number of times a file was removed while still open by another process.
	SillyRename uint64
	// Number of times the NFS server gave less data than expected while reading.
	ShortRead uint64
	// Number of times the NFS server wrote less data than expected while writing.
	ShortWrite uint64
	// Number of times the NFS server indicated EJUKEBOX; retrieving data from
	// offline storage.
	JukeboxDelay uint64
	// Number of NFS v4.1+ pNFS reads.
	PNFSRead uint64
	// Number of NFS v4.1+ pNFS writes.
	PNFSWrite uint64
}

A NFSEventsStats contains statistics about NFS event occurrences.

type NFSOperationStats 

type NFSOperationStats struct {
	// The name of the operation.
	Operation string
	// Number of requests performed for this operation.
	Requests uint64
	// Number of times an actual RPC request has been transmitted for this operation.
	Transmissions uint64
	// Number of times a request has had a major timeout.
	MajorTimeouts uint64
	// Number of bytes sent for this operation, including RPC headers and payload.
	BytesSent uint64
	// Number of bytes received for this operation, including RPC headers and payload.
	BytesReceived uint64
	// Duration all requests spent queued for transmission before they were sent.
	CumulativeQueueMilliseconds uint64
	// Duration it took to get a reply back after the request was transmitted.
	CumulativeTotalResponseMilliseconds uint64
	// Duration from when a request was enqueued to when it was completely handled.
	CumulativeTotalRequestMilliseconds uint64
	// The count of operations that complete with tk_status < 0.  These statuses usually indicate error conditions.
	Errors uint64
}

A NFSOperationStats contains statistics for a single operation.

type NFSTransportStats 

type NFSTransportStats struct {
	// The transport protocol used for the NFS mount.
	Protocol string
	// The local port used for the NFS mount.
	Port uint64
	// Number of times the client has had to establish a connection from scratch
	// to the NFS server.
	Bind uint64
	// Number of times the client has made a TCP connection to the NFS server.
	Connect uint64
	// Duration (in jiffies, a kernel internal unit of time) the NFS mount has
	// spent waiting for connections to the server to be established.
	ConnectIdleTime uint64
	// Duration since the NFS mount last saw any RPC traffic.
	IdleTimeSeconds uint64
	// Number of RPC requests for this mount sent to the NFS server.
	Sends uint64
	// Number of RPC responses for this mount received from the NFS server.
	Receives uint64
	// Number of times the NFS server sent a response with a transaction ID
	// unknown to this client.
	BadTransactionIDs uint64
	// A running counter, incremented on each request as the current difference
	// ebetween sends and receives.
	CumulativeActiveRequests uint64
	// A running counter, incremented on each request by the current backlog
	// queue size.
	CumulativeBacklog uint64

	// Maximum number of simultaneously active RPC requests ever used.
	MaximumRPCSlotsUsed uint64
	// A running counter, incremented on each request as the current size of the
	// sending queue.
	CumulativeSendingQueue uint64
	// A running counter, incremented on each request as the current size of the
	// pending queue.
	CumulativePendingQueue uint64
}

A NFSTransportStats contains statistics for the NFS mount RPC requests and responses.

type Namespace 

type Namespace struct {
	Type  string // Namespace type.
	Inode uint32 // Inode number of the namespace. If two processes are in the same namespace their inodes will match.
}

Namespace represents a single namespace of a process.

type Namespaces 

type Namespaces map[string]Namespace

Namespaces contains all of the namespaces that the process is contained in.

type NetDev 

type NetDev map[string]NetDevLine

NetDev is parsed from /proc/net/dev or /proc/[pid]/net/dev. The map keys are interface names.

func (NetDev) Total 

func (netDev NetDev) Total() NetDevLine

Total aggregates the values across interfaces and returns a new NetDevLine. The Name field will be a sorted comma separated list of interface names.

type NetDevLine 

type NetDevLine struct {
	Name         string `json:"name"`          // The name of the interface.
	RxBytes      uint64 `json:"rx_bytes"`      // Cumulative count of bytes received.
	RxPackets    uint64 `json:"rx_packets"`    // Cumulative count of packets received.
	RxErrors     uint64 `json:"rx_errors"`     // Cumulative count of receive errors encountered.
	RxDropped    uint64 `json:"rx_dropped"`    // Cumulative count of packets dropped while receiving.
	RxFIFO       uint64 `json:"rx_fifo"`       // Cumulative count of FIFO buffer errors.
	RxFrame      uint64 `json:"rx_frame"`      // Cumulative count of packet framing errors.
	RxCompressed uint64 `json:"rx_compressed"` // Cumulative count of compressed packets received by the device driver.
	RxMulticast  uint64 `json:"rx_multicast"`  // Cumulative count of multicast frames received by the device driver.
	TxBytes      uint64 `json:"tx_bytes"`      // Cumulative count of bytes transmitted.
	TxPackets    uint64 `json:"tx_packets"`    // Cumulative count of packets transmitted.
	TxErrors     uint64 `json:"tx_errors"`     // Cumulative count of transmit errors encountered.
	TxDropped    uint64 `json:"tx_dropped"`    // Cumulative count of packets dropped while transmitting.
	TxFIFO       uint64 `json:"tx_fifo"`       // Cumulative count of FIFO buffer errors.
	TxCollisions uint64 `json:"tx_collisions"` // Cumulative count of collisions detected on the interface.
	TxCarrier    uint64 `json:"tx_carrier"`    // Cumulative count of carrier losses detected by the device driver.
	TxCompressed uint64 `json:"tx_compressed"` // Cumulative count of compressed packets transmitted by the device driver.
}

NetDevLine is single line parsed from /proc/net/dev or /proc/[pid]/net/dev.

type NetIPSocket 

type NetIPSocket []*netIPSocketLine

NetIPSocket represents the contents of /proc/net/{t,u}dp{,6} file without the header.

type NetIPSocketSummary 

type NetIPSocketSummary struct {
	// TxQueueLength shows the total queue length of all parsed tx_queue lengths.
	TxQueueLength uint64
	// RxQueueLength shows the total queue length of all parsed rx_queue lengths.
	RxQueueLength uint64
	// UsedSockets shows the total number of parsed lines representing the
	// number of used sockets.
	UsedSockets uint64
}

NetIPSocketSummary provides already computed values like the total queue lengths or the total number of used sockets. In contrast to NetIPSocket it does not collect the parsed lines into a slice.

type NetProtocolCapabilities 

type NetProtocolCapabilities struct {
	Close               bool // 8
	Connect             bool // 9
	Disconnect          bool // 10
	Accept              bool // 11
	IoCtl               bool // 12
	Init                bool // 13
	Destroy             bool // 14
	Shutdown            bool // 15
	SetSockOpt          bool // 16
	GetSockOpt          bool // 17
	SendMsg             bool // 18
	RecvMsg             bool // 19
	SendPage            bool // 20
	Bind                bool // 21
	BacklogRcv          bool // 22
	Hash                bool // 23
	UnHash              bool // 24
	GetPort             bool // 25
	EnterMemoryPressure bool // 26
}

NetProtocolCapabilities contains a list of capabilities for each protocol

type NetProtocolStatLine 

type NetProtocolStatLine struct {
	Name         string // 0 The name of the protocol
	Size         uint64 // 1 The size, in bytes, of a given protocol structure. e.g. sizeof(struct tcp_sock) or sizeof(struct unix_sock)
	Sockets      int64  // 2 Number of sockets in use by this protocol
	Memory       int64  // 3 Number of 4KB pages allocated by all sockets of this protocol
	Pressure     int    // 4 This is either yes, no, or NI (not implemented). For the sake of simplicity we treat NI as not experiencing memory pressure.
	MaxHeader    uint64 // 5 Protocol specific max header size
	Slab         bool   // 6 Indicates whether or not memory is allocated from the SLAB
	ModuleName   string // 7 The name of the module that implemented this protocol or "kernel" if not from a module
	Capabilities NetProtocolCapabilities
}

NetProtocolStatLine contains a single line parsed from /proc/net/protocols. We only care about the first six columns as the rest are not likely to change and only serve to provide a set of capabilities for each protocol.

type NetProtocolStats 

type NetProtocolStats map[string]NetProtocolStatLine

NetProtocolStats stores the contents from /proc/net/protocols

type NetSockstat 

type NetSockstat struct {
	// Used is non-nil for IPv4 sockstat results, but nil for IPv6.
	Used      *int
	Protocols []NetSockstatProtocol
}

A NetSockstat contains the output of /proc/net/sockstat{,6} for IPv4 or IPv6, respectively.

type NetSockstatProtocol 

type NetSockstatProtocol struct {
	Protocol string
	InUse    int
	Orphan   *int
	TW       *int
	Alloc    *int
	Mem      *int
	Memory   *int
}

A NetSockstatProtocol contains statistics about a given socket protocol. Pointer fields indicate that the value may or may not be present on any given protocol.

type NetStat 

type NetStat struct {
	Filename string
	Stats    map[string][]uint64
}

NetStat contains statistics for all the counters from one file

type NetTCP 

type NetTCP []*netIPSocketLine

NetTCP represents the contents of /proc/net/tcp{,6} file without the header.

type NetTCPSummary 

type NetTCPSummary NetIPSocketSummary

NetTCPSummary provides already computed values like the total queue lengths or the total number of used sockets. In contrast to NetTCP it does not collect the parsed lines into a slice.

type NetUDP 

type NetUDP []*netIPSocketLine

NetUDP represents the contents of /proc/net/udp{,6} file without the header.

type NetUDPSummary 

type NetUDPSummary NetIPSocketSummary

NetUDPSummary provides already computed values like the total queue lengths or the total number of used sockets. In contrast to NetUDP it does not collect the parsed lines into a slice.

type NetUNIX 

type NetUNIX struct {
	Rows []*NetUNIXLine
}

NetUNIX holds the data read from /proc/net/unix.

type NetUNIXFlags 

type NetUNIXFlags uint64

NetUNIXFlags is the type of the flags field.

func (NetUNIXFlags) String 

func (f NetUNIXFlags) String() string

type NetUNIXLine 

type NetUNIXLine struct {
	KernelPtr string
	RefCount  uint64
	Protocol  uint64
	Flags     NetUNIXFlags
	Type      NetUNIXType
	State     NetUNIXState
	Inode     uint64
	Path      string
}

NetUNIXLine represents a line of /proc/net/unix.

type NetUNIXState 

type NetUNIXState uint64

NetUNIXState is the type of the state field.

func (NetUNIXState) String 

func (s NetUNIXState) String() string

type NetUNIXType 

type NetUNIXType uint64

NetUNIXType is the type of the type field.

func (NetUNIXType) String 

func (t NetUNIXType) String() string

type PSILine 

type PSILine struct {
	Avg10  float64
	Avg60  float64
	Avg300 float64
	Total  uint64
}

PSILine is a single line of values as returned by /proc/pressure/* The Avg entries are averages over n seconds, as a percentage The Total line is in microseconds

type PSIStats 

type PSIStats struct {
	Some *PSILine
	Full *PSILine
}

PSIStats represent pressure stall information from /proc/pressure/* Some indicates the share of time in which at least some tasks are stalled Full indicates the share of time in which all non-idle tasks are stalled simultaneously

type Proc 

type Proc struct {
	// The process ID.
	PID int
	// contains filtered or unexported fields
}

Proc provides information about a running process.

func NewProc 

func NewProc(pid int) (Proc, error)

NewProc returns a process for the given pid under /proc.

func Self 

func Self() (Proc, error)

Self returns a process for the current process read via /proc/self.

func (Proc) Cgroups 

func (p Proc) Cgroups() ([]Cgroup, error)

Cgroups reads from /proc/<pid>/cgroups and returns a []*Cgroup struct locating this PID in each process control hierarchy running on this system. On every system (v1 and v2), all hierarchies contain all processes, so the len of the returned struct is equal to the number of active hierarchies on this system

func (Proc) CmdLine 

func (p Proc) CmdLine() ([]string, error)

CmdLine returns the command line of a process.

func (Proc) Comm 

func (p Proc) Comm() (string, error)

Comm returns the command name of a process.

func (Proc) Cwd 

func (p Proc) Cwd() (string, error)

Cwd returns the absolute path to the current working directory of the process.

func (Proc) Environ 

func (p Proc) Environ() ([]string, error)

Environ reads process environments from /proc/<pid>/environ

func (Proc) Executable 

func (p Proc) Executable() (string, error)

Executable returns the absolute path of the executable command of a process.

func (Proc) FDInfo 

func (p Proc) FDInfo(fd string) (*ProcFDInfo, error)

FDInfo constructor. On kernels older than 3.8, InotifyInfos will always be empty.

func (Proc) FileDescriptorTargets 

func (p Proc) FileDescriptorTargets() ([]string, error)

FileDescriptorTargets returns the targets of all file descriptors of a process. If a file descriptor is not a symlink to a file (like a socket), that value will be the empty string.

func (Proc) FileDescriptors 

func (p Proc) FileDescriptors() ([]uintptr, error)

FileDescriptors returns the currently open file descriptors of a process.

func (Proc) FileDescriptorsInfo 

func (p Proc) FileDescriptorsInfo() (ProcFDInfos, error)

FileDescriptorsInfo retrieves information about all file descriptors of the process.

func (Proc) FileDescriptorsLen 

func (p Proc) FileDescriptorsLen() (int, error)

FileDescriptorsLen returns the number of currently open file descriptors of a process.

func (Proc) IO 

func (p Proc) IO() (ProcIO, error)

IO creates a new ProcIO instance from a given Proc instance.

func (Proc) Limits 

func (p Proc) Limits() (ProcLimits, error)

Limits returns the current soft limits of the process.

func (Proc) MountInfo 

func (p Proc) MountInfo() ([]*MountInfo, error)

MountInfo retrieves mount information for mount points in a process's namespace. It supplies information missing in `/proc/self/mounts` and fixes various other problems with that file too.

func (Proc) MountStats 

func (p Proc) MountStats() ([]*Mount, error)

MountStats retrieves statistics and configuration for mount points in a process's namespace.

func (Proc) Namespaces 

func (p Proc) Namespaces() (Namespaces, error)

Namespaces reads from /proc/<pid>/ns/* to get the namespaces of which the process is a member.

func (Proc) NetDev 

func (p Proc) NetDev() (NetDev, error)

NetDev returns kernel/system statistics read from /proc/[pid]/net/dev.

func (Proc) NewLimits deprecated 

func (p Proc) NewLimits() (ProcLimits, error)

NewLimits returns the current soft limits of the process.

Deprecated: use p.Limits() instead

func (Proc) NewStat deprecated 

func (p Proc) NewStat() (ProcStat, error)

NewStat returns the current status information of the process.

Deprecated: use p.Stat() instead

func (Proc) NewStatus 

func (p Proc) NewStatus() (ProcStatus, error)

NewStatus returns the current status information of the process.

func (Proc) ProcMaps 

func (p Proc) ProcMaps() ([]*ProcMap, error)

ProcMaps reads from /proc/[pid]/maps to get the memory-mappings of the process.

func (Proc) ProcSMapsRollup 

func (p Proc) ProcSMapsRollup() (ProcSMapsRollup, error)

ProcSMapsRollup reads from /proc/[pid]/smaps_rollup to get summed memory information of the process.

If smaps_rollup does not exists (require kernel >= 4.15), the content of /proc/pid/smaps will we read and summed.

func (Proc) RootDir 

func (p Proc) RootDir() (string, error)

RootDir returns the absolute path to the process's root directory (as set by chroot)

func (Proc) Schedstat 

func (p Proc) Schedstat() (ProcSchedstat, error)

Schedstat returns task scheduling information for the process.

func (Proc) Stat 

func (p Proc) Stat() (ProcStat, error)

Stat returns the current status information of the process.

func (Proc) Wchan 

func (p Proc) Wchan() (string, error)

Wchan returns the wchan (wait channel) of a process.

type ProcFDInfo 

type ProcFDInfo struct {
	// File descriptor
	FD string
	// File offset
	Pos string
	// File access mode and status flags
	Flags string
	// Mount point ID
	MntID string
	// List of inotify lines (structured) in the fdinfo file (kernel 3.8+ only)
	InotifyInfos []InotifyInfo
}

ProcFDInfo contains represents file descriptor information.

type ProcFDInfos 

type ProcFDInfos []ProcFDInfo

ProcFDInfos represents a list of ProcFDInfo structs.

func (ProcFDInfos) InotifyWatchLen 

func (p ProcFDInfos) InotifyWatchLen() (int, error)

InotifyWatchLen returns the total number of inotify watches

func (ProcFDInfos) Len 

func (p ProcFDInfos) Len() int

func (ProcFDInfos) Less 

func (p ProcFDInfos) Less(i, j int) bool

func (ProcFDInfos) Swap 

func (p ProcFDInfos) Swap(i, j int)

type ProcIO 

type ProcIO struct {
	// Chars read.
	RChar uint64
	// Chars written.
	WChar uint64
	// Read syscalls.
	SyscR uint64
	// Write syscalls.
	SyscW uint64
	// Bytes read.
	ReadBytes uint64
	// Bytes written.
	WriteBytes uint64
	// Bytes written, but taking into account truncation. See
	// Documentation/filesystems/proc.txt in the kernel sources for
	// detailed explanation.
	CancelledWriteBytes int64
}

ProcIO models the content of /proc/<pid>/io.

type ProcLimits 

type ProcLimits struct {
	// CPU time limit in seconds.
	CPUTime uint64
	// Maximum size of files that the process may create.
	FileSize uint64
	// Maximum size of the process's data segment (initialized data,
	// uninitialized data, and heap).
	DataSize uint64
	// Maximum size of the process stack in bytes.
	StackSize uint64
	// Maximum size of a core file.
	CoreFileSize uint64
	// Limit of the process's resident set in pages.
	ResidentSet uint64
	// Maximum number of processes that can be created for the real user ID of
	// the calling process.
	Processes uint64
	// Value one greater than the maximum file descriptor number that can be
	// opened by this process.
	OpenFiles uint64
	// Maximum number of bytes of memory that may be locked into RAM.
	LockedMemory uint64
	// Maximum size of the process's virtual memory address space in bytes.
	AddressSpace uint64
	// Limit on the combined number of flock(2) locks and fcntl(2) leases that
	// this process may establish.
	FileLocks uint64
	// Limit of signals that may be queued for the real user ID of the calling
	// process.
	PendingSignals uint64
	// Limit on the number of bytes that can be allocated for POSIX message
	// queues for the real user ID of the calling process.
	MsqqueueSize uint64
	// Limit of the nice priority set using setpriority(2) or nice(2).
	NicePriority uint64
	// Limit of the real-time priority set using sched_setscheduler(2) or
	// sched_setparam(2).
	RealtimePriority uint64
	// Limit (in microseconds) on the amount of CPU time that a process
	// scheduled under a real-time scheduling policy may consume without making
	// a blocking system call.
	RealtimeTimeout uint64
}

ProcLimits represents the soft limits for each of the process's resource limits. For more information see getrlimit(2): http://man7.org/linux/man-pages/man2/getrlimit.2.html.

type ProcMap 

type ProcMap struct {
	// The start address of current mapping.
	StartAddr uintptr
	// The end address of the current mapping
	EndAddr uintptr
	// The permissions for this mapping
	Perms *ProcMapPermissions
	// The current offset into the file/fd (e.g., shared libs)
	Offset int64
	// Device owner of this mapping (major:minor) in Mkdev format.
	Dev uint64
	// The inode of the device above
	Inode uint64
	// The file or psuedofile (or empty==anonymous)
	Pathname string
}

ProcMap contains the process memory-mappings of the process, read from /proc/[pid]/maps

type ProcMapPermissions 

type ProcMapPermissions struct {
	// mapping has the [R]ead flag set
	Read bool
	// mapping has the [W]rite flag set
	Write bool
	// mapping has the [X]ecutable flag set
	Execute bool
	// mapping has the [S]hared flag set
	Shared bool
	// mapping is marked as [P]rivate (copy on write)
	Private bool
}

ProcMapPermissions contains permission settings read from /proc/[pid]/maps

type ProcSMapsRollup 

type ProcSMapsRollup struct {
	// Amount of the mapping that is currently resident in RAM
	Rss uint64
	// Process's proportional share of this mapping
	Pss uint64
	// Size in bytes of clean shared pages
	SharedClean uint64
	// Size in bytes of dirty shared pages
	SharedDirty uint64
	// Size in bytes of clean private pages
	PrivateClean uint64
	// Size in bytes of dirty private pages
	PrivateDirty uint64
	// Amount of memory currently marked as referenced or accessed
	Referenced uint64
	// Amount of memory that does not belong to any file
	Anonymous uint64
	// Amount would-be-anonymous memory currently on swap
	Swap uint64
	// Process's proportional memory on swap
	SwapPss uint64
}

type ProcSchedstat 

type ProcSchedstat struct {
	RunningNanoseconds uint64
	WaitingNanoseconds uint64
	RunTimeslices      uint64
}

ProcSchedstat contains the values from /proc/<pid>/schedstat

type ProcStat 

type ProcStat struct {
	// The process ID.
	PID int
	// The filename of the executable.
	Comm string
	// The process state.
	State string
	// The PID of the parent of this process.
	PPID int
	// The process group ID of the process.
	PGRP int
	// The session ID of the process.
	Session int
	// The controlling terminal of the process.
	TTY int
	// The ID of the foreground process group of the controlling terminal of
	// the process.
	TPGID int
	// The kernel flags word of the process.
	Flags uint
	// The number of minor faults the process has made which have not required
	// loading a memory page from disk.
	MinFlt uint
	// The number of minor faults that the process's waited-for children have
	// made.
	CMinFlt uint
	// The number of major faults the process has made which have required
	// loading a memory page from disk.
	MajFlt uint
	// The number of major faults that the process's waited-for children have
	// made.
	CMajFlt uint
	// Amount of time that this process has been scheduled in user mode,
	// measured in clock ticks.
	UTime uint
	// Amount of time that this process has been scheduled in kernel mode,
	// measured in clock ticks.
	STime uint
	// Amount of time that this process's waited-for children have been
	// scheduled in user mode, measured in clock ticks.
	CUTime int
	// Amount of time that this process's waited-for children have been
	// scheduled in kernel mode, measured in clock ticks.
	CSTime int
	// For processes running a real-time scheduling policy, this is the negated
	// scheduling priority, minus one.
	Priority int
	// The nice value, a value in the range 19 (low priority) to -20 (high
	// priority).
	Nice int
	// Number of threads in this process.
	NumThreads int
	// The time the process started after system boot, the value is expressed
	// in clock ticks.
	Starttime uint64
	// Virtual memory size in bytes.
	VSize uint
	// Resident set size in pages.
	RSS int
	// Soft limit in bytes on the rss of the process.
	RSSLimit uint64
	// CPU number last executed on
	Processor uint
	// Real-time scheduling priority, a number in the range 1 to 99 for processes
	// scheduled under a real-time policy, or 0, for non-real-time processes.
	RTPriority uint
	// Scheduling policy.
	Policy uint
	// Aggregated block I/O delays, measured in clock ticks (centiseconds).
	DelayAcctBlkIOTicks uint64
	// contains filtered or unexported fields
}

ProcStat provides status information about the process, read from /proc/[pid]/stat.

func (ProcStat) CPUTime 

func (s ProcStat) CPUTime() float64

CPUTime returns the total CPU user and system time in seconds.

func (ProcStat) ResidentMemory 

func (s ProcStat) ResidentMemory() int

ResidentMemory returns the resident memory size in bytes.

func (ProcStat) StartTime 

func (s ProcStat) StartTime() (float64, error)

StartTime returns the unix timestamp of the process in seconds.

func (ProcStat) VirtualMemory 

func (s ProcStat) VirtualMemory() uint

VirtualMemory returns the virtual memory size in bytes.

type ProcStatus 

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

ProcStatus provides status information about the process, read from /proc/[pid]/stat.

func (ProcStatus) TotalCtxtSwitches 

func (s ProcStatus) TotalCtxtSwitches() uint64

TotalCtxtSwitches returns the total context switch.

type Procs 

type Procs []Proc

Procs represents a list of Proc structs.

func AllProcs 

func AllProcs() (Procs, error)

AllProcs returns a list of all currently available processes under /proc.

func (Procs) Len 

func (p Procs) Len() int

func (Procs) Less 

func (p Procs) Less(i, j int) bool

func (Procs) Swap 

func (p Procs) Swap(i, j int)

type Schedstat 

type Schedstat struct {
	CPUs []*SchedstatCPU
}

Schedstat contains scheduler statistics from /proc/schedstat

See https://www.kernel.org/doc/Documentation/scheduler/sched-stats.txt for a detailed description of what these numbers mean.

Note the current kernel documentation claims some of the time units are in jiffies when they are actually in nanoseconds since 2.6.23 with the introduction of CFS. A fix to the documentation is pending. See https://lore.kernel.org/patchwork/project/lkml/list/?series=403473

type SchedstatCPU 

type SchedstatCPU struct {
	CPUNum string

	RunningNanoseconds uint64
	WaitingNanoseconds uint64
	RunTimeslices      uint64
}

SchedstatCPU contains the values from one "cpu<N>" line

type Slab 

type Slab struct {
	Name         string
	ObjActive    int64
	ObjNum       int64
	ObjSize      int64
	ObjPerSlab   int64
	PagesPerSlab int64
	// tunables
	Limit        int64
	Batch        int64
	SharedFactor int64
	SlabActive   int64
	SlabNum      int64
	SharedAvail  int64
}

Slab represents a slab pool in the kernel.

type SlabInfo 

type SlabInfo struct {
	Slabs []*Slab
}

SlabInfo represents info for all slabs.

type SoftIRQStat 

type SoftIRQStat struct {
	Hi          uint64
	Timer       uint64
	NetTx       uint64
	NetRx       uint64
	Block       uint64
	BlockIoPoll uint64
	Tasklet     uint64
	Sched       uint64
	Hrtimer     uint64
	Rcu         uint64
}

SoftIRQStat represent the softirq statistics as exported in the procfs stat file. A nice introduction can be found at https://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-9.html It is possible to get per-cpu stats by reading /proc/softirqs

type SoftnetStat 

type SoftnetStat struct {
	// Number of processed packets
	Processed uint32
	// Number of dropped packets
	Dropped uint32
	// Number of times processing packets ran out of quota
	TimeSqueezed uint32
}

SoftnetStat contains a single row of data from /proc/net/softnet_stat

type Stat 

type Stat struct {
	// Boot time in seconds since the Epoch.
	BootTime uint64
	// Summed up cpu statistics.
	CPUTotal CPUStat
	// Per-CPU statistics.
	CPU []CPUStat
	// Number of times interrupts were handled, which contains numbered and unnumbered IRQs.
	IRQTotal uint64
	// Number of times a numbered IRQ was triggered.
	IRQ []uint64
	// Number of times a context switch happened.
	ContextSwitches uint64
	// Number of times a process was created.
	ProcessCreated uint64
	// Number of processes currently running.
	ProcessesRunning uint64
	// Number of processes currently blocked (waiting for IO).
	ProcessesBlocked uint64
	// Number of times a softirq was scheduled.
	SoftIRQTotal uint64
	// Detailed softirq statistics.
	SoftIRQ SoftIRQStat
}

Stat represents kernel/system statistics.

func NewStat deprecated 

func NewStat() (Stat, error)

NewStat returns information about current cpu/process statistics. See https://www.kernel.org/doc/Documentation/filesystems/proc.txt

Deprecated: use fs.Stat() instead

type Swap 

type Swap struct {
	Filename string
	Type     string
	Size     int
	Used     int
	Priority int
}

Swap represents an entry in /proc/swaps.

type VM 

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
}

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 XfrmStat 

type XfrmStat struct {
	// All errors which are not matched by other
	XfrmInError int
	// No buffer is left
	XfrmInBufferError int
	// Header Error
	XfrmInHdrError int
	// No state found
	// i.e. either inbound SPI, address, or IPSEC protocol at SA is wrong
	XfrmInNoStates int
	// Transformation protocol specific error
	// e.g. SA Key is wrong
	XfrmInStateProtoError int
	// Transformation mode specific error
	XfrmInStateModeError int
	// Sequence error
	// e.g. sequence number is out of window
	XfrmInStateSeqError int
	// State is expired
	XfrmInStateExpired int
	// State has mismatch option
	// e.g. UDP encapsulation type is mismatched
	XfrmInStateMismatch int
	// State is invalid
	XfrmInStateInvalid int
	// No matching template for states
	// e.g. Inbound SAs are correct but SP rule is wrong
	XfrmInTmplMismatch int
	// No policy is found for states
	// e.g. Inbound SAs are correct but no SP is found
	XfrmInNoPols int
	// Policy discards
	XfrmInPolBlock int
	// Policy error
	XfrmInPolError int
	// All errors which are not matched by others
	XfrmOutError int
	// Bundle generation error
	XfrmOutBundleGenError int
	// Bundle check error
	XfrmOutBundleCheckError int
	// No state was found
	XfrmOutNoStates int
	// Transformation protocol specific error
	XfrmOutStateProtoError int
	// Transportation mode specific error
	XfrmOutStateModeError int
	// Sequence error
	// i.e sequence number overflow
	XfrmOutStateSeqError int
	// State is expired
	XfrmOutStateExpired int
	// Policy discads
	XfrmOutPolBlock int
	// Policy is dead
	XfrmOutPolDead int
	// Policy Error
	XfrmOutPolError     int
	XfrmFwdHdrError     int
	XfrmOutStateInvalid int
	XfrmAcquireError    int
}

XfrmStat models the contents of /proc/net/xfrm_stat.

func NewXfrmStat 

func NewXfrmStat() (XfrmStat, error)

NewXfrmStat reads the xfrm_stat statistics.

type Zoneinfo 

type Zoneinfo struct {
	Node                       string
	Zone                       string
	NrFreePages                *int64
	Min                        *int64
	Low                        *int64
	High                       *int64
	Scanned                    *int64
	Spanned                    *int64
	Present                    *int64
	Managed                    *int64
	NrActiveAnon               *int64
	NrInactiveAnon             *int64
	NrIsolatedAnon             *int64
	NrAnonPages                *int64
	NrAnonTransparentHugepages *int64
	NrActiveFile               *int64
	NrInactiveFile             *int64
	NrIsolatedFile             *int64
	NrFilePages                *int64
	NrSlabReclaimable          *int64
	NrSlabUnreclaimable        *int64
	NrMlockStack               *int64
	NrKernelStack              *int64
	NrMapped                   *int64
	NrDirty                    *int64
	NrWriteback                *int64
	NrUnevictable              *int64
	NrShmem                    *int64
	NrDirtied                  *int64
	NrWritten                  *int64
	NumaHit                    *int64
	NumaMiss                   *int64
	NumaForeign                *int64
	NumaInterleave             *int64
	NumaLocal                  *int64
	NumaOther                  *int64
	Protection                 []*int64
}

Zoneinfo holds info parsed from /proc/zoneinfo.

Source Files

View all Source files

Directories

Path Synopsis
Package bcache provides access to statistics exposed by the bcache (Linux block cache).
 Package bcache provides access to statistics exposed by the bcache (Linux block cache).
Package btrfs provides access to statistics exposed by Btrfs filesystems.
 Package btrfs provides access to statistics exposed by Btrfs filesystems.
internal
fs
util
Package nfs implements parsing of /proc/net/rpc/nfsd.
 Package nfs implements parsing of /proc/net/rpc/nfsd.
Package sysfs provides functions to retrieve system and kernel metrics from the pseudo-filesystem sys.
 Package sysfs provides functions to retrieve system and kernel metrics from the pseudo-filesystem sys.
Package xfs provides access to statistics exposed by the XFS filesystem.
 Package xfs provides access to statistics exposed by the XFS filesystem.

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