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@(#)pstat.8 6.7 (Berkeley) 06/26/91

C 4 pstat - display system data structures pstat [ -Tpfvtsxn ] [ -U pid ] [ system ] [ corefile ] Pstat displays certain system data structures. If corefile is given, the information is sought there, otherwise in /dev/kmem. The required namelist is taken from /vmunix unless system is specified. Options are ??? .TP \w'WCHAN 'u

-v Print the active vnodes. Each group of vnodes coresponding 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 ufs, nfs, mfs, or pc; from is the filesystem is 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:

Location of this vnode. File type. A list of letters representing vnode flags:

R - VROOT
T - VTEXT
L - VXLOCK
W - VXWANT
E - VEXLOCK
S - VSHLOCK
T - VLWAIT
A - VALIASED
B - VBWAIT
**** WAS HERE *****

Next The core location of this table entry.

0

Miscellaneous state variables encoded thus: Number of open file table entries for this inode. Major and minor device number of file system in which this inode resides. Reference count of shared locks on the inode. Reference count of exclusive locks on the inode (this may be > 1 if, for example, a file descriptor is inherited across a fork). I-number within the device. Mode bits, see chmod (2). Number of links to this inode. User ID of owner. Number of bytes in an ordinary file, or major and minor device of special file.

-x Print the text table with these headings:

The core location of this table entry.

0

Miscellaneous state variables encoded thus:

Disk address in swap, measured in multiples of 512 bytes. Head of a linked list of loaded processes using this text segment. Size of resident text, measured in multiples of 512 bytes. Size of text segment, measured in multiples of 512 bytes. Core location of corresponding vnode. Number of processes using this text segment. Number of processes in core using this text segment. Forward link in free list. Backward link in free list.

-p Print process table for active processes with these headings:

The core location of this table entry.

0

Run state encoded thus: Miscellaneous state variables, or'ed together (hexadecimal): number of pages currently being pushed out from this process. Scheduling priority, see setpriority (2). Signals received (signals 1-32 coded in bits 0-31), Real user ID. Amount of time process has been blocked. Time resident in seconds; times over 127 coded as 127. Weighted integral of CPU time, for scheduler. Nice level, see setpriority (2). The process ID number. The process ID of parent process. If in core, the page frame number of the first page of the `u-area' of the process. If swapped out, the position in the swap area measured in multiples of 512 bytes. Resident set size - the number of physical page frames allocated to this process. RSS at last swap (0 if never swapped). Virtual size of process image (data+stack) in multiples of 512 bytes. Wait channel number of a waiting process. Link pointer in list of runnable processes. If text is pure, pointer to location of text table entry.

-t Print table for terminals with these headings:

Number of characters in raw input queue.

0

Number of characters in canonicalized input queue. Number of characters in putput queue. See tty (4). Physical device address. Number of delimiters (newlines) in canonicalized input queue. Calculated column position of terminal. Miscellaneous state variables encoded thus: Process group for which this is controlling terminal. Line discipline; blank is old tty OTTYDISC or ``new tty'' for NTTYDISC or ``net'' for NETLDISC (see bk (4)).

-u print information about a user process; the next argument is its address as given by ps (1). The process must be in main memory, or the file used can be a core image and the address 0. Only the fields located in the first page cluster can be located succesfully if the process is in main memory.

-f Print the open file table with these headings:

The core location of this table entry. The type of object the file table entry points to.

0

Miscellaneous state variables encoded thus: Number of processes that know this open file. Number of messages outstanding for this file. The location of the vnode table entry or socket structure for this file. The file offset (see lseek (2)).

-s print information about swap space usage: the number of (1k byte) pages used and free is given as well as the number of used pages which belong to text images.

-T prints the number of used and free slots in the several system tables and is useful for checking to see how full system tables have become if the system is under heavy load.

/vmunix namelist

/dev/kmem default source of tables

iostat(1), ps(1), systat(1), vmstat(1), stat(2), fs(5),

K. Thompson, UNIX Implementation

It would be very useful if the system recorded \*(lqmaximum occupancy\*(rq on the tables reported by -T; even more useful if these tables were dynamically allocated.