.\"	$OpenBSD: pstat.8,v 1.56 2019/04/23 17:52:12 schwarze Exp $
.\"	$NetBSD: pstat.8,v 1.9.4.1 1996/06/02 09:08:17 mrg Exp $
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.\"     from: @(#)pstat.8	8.4 (Berkeley) 4/19/94
.\"
.Dd $Mdocdate: April 23 2019 $
.Dt PSTAT 8
.Os
.Sh NAME
.Nm pstat
.Nd display system data structures
.Sh SYNOPSIS
.Nm pstat
.Op Fl fknsTtv
.Op Fl M Ar core
.Op Fl N Ar system
.Op Fl d Ar format Ar symbol ...
.Sh DESCRIPTION
.Nm
displays open file entry, swap space utilization,
terminal state, and vnode data structure information.
If
.Ar core
is given, the information is sought there, otherwise
in the running kernel via
.Pa /dev/kmem .
The required namelist is taken from the running kernel unless
.Ar system
is specified.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl d Ar format Ar symbol ...
Print the values of
.Ar symbol
using the specified format.
.Ar format
is a
.Xr printf 3 Ns -style
format, without the leading percent or precision specifiers,
such as
.Ar s ,
.Ar p ,
or
.Ar llx .
Symbol names are read from the remaining command line arguments.
Addresses may also be specified in hex.
.Pp
The
.Fl d
option requires the ability to open
.Pa /dev/kmem
which may be restricted based upon the value of the
.Ar kern.allowkmem
.Xr sysctl 8 .
.It Fl f
Print the open file table with these headings:
.Bl -tag -width indent
.It LOC
The core location of this table entry.
.It TYPE
The type of object the file table entry points to.
.It FLG
Miscellaneous state variables encoded thus:
.Pp
.Bl -tag -width indent -compact
.It R
open for reading
.It W
open for writing
.It A
open for appending
.It L
exclusive or shared lock present
.It I
signal pgrp when data ready
.El
.It CNT
Number of processes that know this open file.
.It MSG
Number of messages outstanding for this file.
.It DATA
The location of the vnode table entry or socket structure for this file.
.It OFFSET
The file offset (see
.Xr lseek 2 ) .
This information is only visible to the user or superuser.
.El
.It Fl k
Use 1K-byte blocks.
.It Fl M Ar core
Extract values associated with the name list from the specified core
instead of the running kernel.
.It Fl N Ar system
Extract the name list from the specified system
instead of the running kernel.
.It Fl n
Print devices by major/minor number rather than by name.
.It Fl s
Print information about swap space usage on all the
swap areas compiled into the kernel.
The first column is the device name of the partition.
The next column is the total space available in the partition.
The
.Ar Used
column indicates the total blocks used so far;
the
.Ar Available
column indicates how much space is remaining on each partition.
The
.Ar Capacity
reports the percentage of space used.
.Pp
If more than one partition is configured into the system, totals for all
of the statistics will be reported in the final line of the report.
.It Fl T
Prints the number of used and free slots for open files, used vnodes, and swap
space.
It is useful for checking to see how large system tables become
if the system is under heavy load.
.It Fl t
Print table for terminals
with these headings:
.Bl -tag -width indent
.It LINE
Physical device name.
.It RAW
Number of characters in raw input queue.
.It CAN
Number of characters in canonicalized input queue.
.It OUT
Number of characters in output queue.
.It HWT
High water mark for output.
.It LWT
Low water mark for output.
.It COL
Calculated column position of terminal.
.It STATE
Miscellaneous state variables encoded thus:
.Pp
.Bl -tag -width indent -compact
.It W
waiting for open to complete
.It O
open
.It C
carrier is on
.It T
delay timeout in progress
.It F
outq has been flushed during DMA
.It B
busy doing output
.It A
process is awaiting output
.It X
open for exclusive use
.It S
output stopped
.It K
further input blocked
.It Y
tty in async I/O mode
.It D
next character is escaped lowercase special
.It E
printing erase sequence
.It L
next character is literal
.It P
retyping suspended input
.It N
counting tab width, ignoring output flush
.El
.It SESS
Enclosing session.
.It PGID
Process group for which this is controlling terminal.
.It DISC
Line discipline:
.Ql term
for
TTYDISC (see
.Xr termios 4 ) ,
.Ql ppp
for PPPDISC (see
.Xr ppp 4 )
and
.Ql nmea
for NMEADISC (see
.Xr nmea 4 ) .
.El
.It Fl v
Print the active vnodes.
Each group of vnodes corresponding
to a particular filesystem is preceded by a two line header.
The first line consists of the following:
.Pp
.No *** MOUNT Em fstype from
on
.Em on fsflags
.Pp
where
.Em fstype
is one of the file systems supported by the kernel;
.Em from
is the partition the filesystem is mounted from;
.Em on
is the directory
the filesystem is mounted on; and
.Em fsflags
is a list
of optional flags applied to the mount (see
.Xr mount 8 ) .
The second line is a header for the individual fields,
the first part of which are fixed, and the second part are filesystem
type specific.
The headers common to all vnodes are:
.Bl -tag -width indent
.It ADDR
Location of this vnode.
.It TYP
File type.
.It VFLAG
A list of letters representing vnode flags:
.Pp
.Bl -tag -width indent -compact
.It R
VROOT root of its file system.
.It T
VTEXT pure text prototype.
.It S
VSYSTEM vnode being used by kernel.
.It I
VISTTY vnode represents a tty.
.It L
VXLOCK locked to change underlying type.
.It W
VXWANT process is waiting for vnode.
.It B
VBWAIT waiting for output to complete.
.It A
VALIASED vnode has an alias.
.It F
VONFREELIST vnode is on a free list.
.It l
VLOCKSWORK FS supports locking discipline.
.It s
VONSYNCLIST vnode is on syncer worklist.
.El
.It USE
The number of references to this vnode.
.It HOLD
The number of I/O buffers held by this vnode.
.It FILEID
The vnode fileid.
In the case of
.Em ffs
this is the inode number.
.It IFLAG
Miscellaneous filesystem specific state variables encoded thus:
.Bl -tag -width indent
.It "For ffs:"
.Bl -tag -width indent -compact
.It A
access time must be corrected
.It C
changed time must be corrected
.It U
modification time must be corrected
.It R
has a rename in progress
.It M
contains modifications
.It m
contains lazy modifications
.It S
shared lock applied
.It E
exclusive lock applied
.El
.It "For nfs:"
.Bl -tag -width indent -compact
.It W
waiting for I/O buffer flush to complete
.It P
I/O buffers being flushed
.It M
locally modified data exists
.It E
an earlier write failed
.It X
non-cacheable lease (nqnfs)
.It O
write lease (nqnfs)
.It G
lease was evicted (nqnfs)
.It A
special file accessed
.It U
special file updated
.It C
special file times changed
.El
.El
.It SIZ/RDEV
Number of bytes in an ordinary file, or
major and minor device of special file.
.El
.Pp
The
.Fl v
option requires the ability to open
.Pa /dev/kmem
which may be restricted based upon the value of the
.Ar kern.allowkmem
.Xr sysctl 8 .
.El
.Sh ENVIRONMENT
.Bl -tag -width BLOCKSIZE
.It Ev BLOCKSIZE
If the environment variable
.Ev BLOCKSIZE
is set, and the
.Fl k
option is not specified, the block counts will be displayed in units of that
size block.
.El
.Sh SEE ALSO
.Xr fstat 1 ,
.Xr netstat 1 ,
.Xr procmap 1 ,
.Xr ps 1 ,
.Xr systat 1 ,
.Xr tcpbench 1 ,
.Xr top 1 ,
.Xr stat 2 ,
.Xr printf 3 ,
.Xr fs 5 ,
.Xr iostat 8 ,
.Xr vmstat 8
.Rs
.%T UNIX Implementation
.%A Ken Thompson
.%J Bell System Technical Journal
.%V Volume 57
.%N Number 6
.%D 1978
.%P pp. 1931\(en1946
.Re
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.0 .
.Sh BUGS
Swap statistics are reported for all swap partitions compiled into the kernel,
regardless of whether those partitions are being used.
.Pp
Does not understand NFS swap servers.