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PSTAT(8) NetBSD System Manager's Manual PSTAT(8)
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by Kimmo Suominen.
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pstat -- display system data structures
pstat [-T | -f | -s | -t | -v] [-ghkmn] [-M core] [-N system]
pstat displays open file entry, swap space utilization, terminal state,
and vnode data structures. If corefile is given, the information is
sought there, otherwise in /dev/kmem. The required namelist is taken
from /netbsd unless system is specified.
The following options are available:
-T Prints the number of used and free slots for open files, used
vnodes, and swap space. This option is useful for checking to
see how large system tables become if the system is under heavy
-f Print the open file table with these headings:
LOC The core location of this table entry.
TYPE The type of object the file table entry points to.
FLG Miscellaneous state variables encoded thus:
R open for reading
W open for writing
A open for appending
S shared lock present
X exclusive lock present
I signal pgrp when data ready
CNT Number of processes that know this open file.
MSG Number of messages outstanding for this file.
DATA The location of the vnode table entry or socket structure
for this file.
USE Number of active users of this open file.
IFLG Value of internal flags.
OFFSET The file offset (see lseek(2)).
-g The -g option uses (1024 * 1024 * 1024) byte blocks instead of
the default 512 byte.
-h Use humanize_number(3) to display (swap) sizes.
-k Use 1K-byte blocks.
-m The -m option uses (1024 * 1024) byte blocks instead of the
default 512 byte.
-n Print devices by major/minor number rather than by name.
-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 Used column indicates the total blocks used
so far; the Available column indicates how much space is remain-
ing on each partition. The Capacity reports the percentage of
If more than one partition is configured into the system, totals
for all of the statistics will be reported in the final line of
-t Print table for terminals with these headings:
LINE Physical device name.
RAW Number of characters in raw input queue.
CAN Number of characters in canonicalized input queue.
OUT Number of characters in output queue.
HWT High water mark for output.
LWT Low water mark for output.
COL Calculated column position of terminal.
STATE Miscellaneous state variables encoded thus:
T delay timeout in progress
F outq has been flushed during DMA
C carrier is on
B busy doing output
A process is awaiting output
X open for exclusive use
S output stopped
K further input blocked
Y tty in async I/O mode
D state for lowercase `\' work
E within a `\.../' for PRTRUB
L next character is literal
P retyping suspended input (PENDIN)
N counting tab width, ignore FLUSHO
> tty used for dialout
SESS Session for which this is controlling terminal.
PGID Current foreground process group associated with this
DISC Line discipline; `term' for TTYDISC (see termios(4)),
`tab' for TABLDISC (see tb(4)), `slip' for SLIPDISC (see
sl(4)), `ppp' for PPPDISC (see ppp(4)), `strip' for
STRIPDISC (see strip(4)), `hdlc' for HDLCDISC.
-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:
*** MOUNT fstype from on on fsflags
where fstype is one of adosfs, afs, cd9660, fdesc, ffs, ext2fs,
kernfs, lfs, lofs, mfs, msdos, nfs, null, procfs, umap, union;
from is the filesystem mounted from; on is the directory the
filesystem is mounted on; and fsflags is a list of optional flags
applied to the mount (see 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:
ADDR Location of this vnode.
TYP File type.
VFLAG A list of letters representing vnode flags:
R VROOT root of its file system.
T VTEXT pure text prototype.
S VSYSTEM vnode being used by kernel.
I VISTTY vnode is a tty.
E VEXECMAP vnode has PROT_EXEC mappings.
D VDIROP lfs vnode involved in directory op.
O VONWORKLST vnode is on syncer work-list.
USE The number of references to this vnode.
HOLD The number of I/O buffers held by this vnode.
TAG The type of underlying data.
NPAGE The number of pages in this vnode.
FILEID The vnode fileid. In the case of ffs or ext2fs this is
the inode number.
IFLAG Miscellaneous filesystem specific state variables encoded
For ffs, lfs or ext2fs:
A access time must be corrected
C changed time must be corrected
U update time (fs(5)) must be corrected
M contains modifications
a has been accessed
R has a rename in progress
S shared lock applied
E exclusive lock applied
c is being cleaned (LFS)
D directory operation in progress (LFS)
s blocks to be freed in free count
W waiting for I/O buffer flush to complete
P I/O buffers being flushed
M locally modified data exists
E an earlier write failed
A special file accessed
U special file updated
C special file times changed
Number of bytes in an ordinary file, or major and minor
device of special file.
BLOCKSIZE If the environment variable BLOCKSIZE is set, and the -k
option is not specified, the block counts will be displayed in
units of that size block.
/dev/kmem default source of tables
ps(1), systat(1), vmstat(1), stat(2), fs(5), iostat(8)
K. Thompson, UNIX Implementation.
The pstat command appeared in 4.0BSD.
Swap statistics are reported for all swap partitions compiled into the
kernel, regardless of whether those partitions are being used.
Does not understand NFS swap servers.
NetBSD 8.0 March 24, 2014 NetBSD 8.0