bc093719ca
The last half year I've been working on a replacement TTY layer for the FreeBSD kernel. The new TTY layer was designed to improve the following: - Improved driver model: The old TTY layer has a driver model that is not abstract enough to make it friendly to use. A good example is the output path, where the device drivers directly access the output buffers. This means that an in-kernel PPP implementation must always convert network buffers into TTY buffers. If a PPP implementation would be built on top of the new TTY layer (still needs a hooks layer, though), it would allow the PPP implementation to directly hand the data to the TTY driver. - Improved hotplugging: With the old TTY layer, it isn't entirely safe to destroy TTY's from the system. This implementation has a two-step destructing design, where the driver first abandons the TTY. After all threads have left the TTY, the TTY layer calls a routine in the driver, which can be used to free resources (unit numbers, etc). The pts(4) driver also implements this feature, which means posix_openpt() will now return PTY's that are created on the fly. - Improved performance: One of the major improvements is the per-TTY mutex, which is expected to improve scalability when compared to the old Giant locking. Another change is the unbuffered copying to userspace, which is both used on TTY device nodes and PTY masters. Upgrading should be quite straightforward. Unlike previous versions, existing kernel configuration files do not need to be changed, except when they reference device drivers that are listed in UPDATING. Obtained from: //depot/projects/mpsafetty/... Approved by: philip (ex-mentor) Discussed: on the lists, at BSDCan, at the DevSummit Sponsored by: Snow B.V., the Netherlands dcons(4) fixed by: kan
362 lines
7.2 KiB
Groff
362 lines
7.2 KiB
Groff
.\"-
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.\" Copyright (c) 2007-2008 Robert N. M. Watson
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 20, 2008
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.Dt PROCSTAT 1
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.Os
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.Sh NAME
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.Nm procstat
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.Nd get detailed process information
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.Sh SYNOPSIS
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.Nm
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.Op Fl h
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.Op Fl w Ar interval
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.Op Fl b | c | f | k | s | t | v
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.Op Fl a | Ar pid ...
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.Sh DESCRIPTION
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The
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.Nm
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utility displays detailed information about the processes identified by the
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.Ar pid
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arguments, or if the
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.Fl a
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flag is used, all processes.
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.Pp
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By default, basic process statistics are printed; one of the following
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options may be specified in order to select more detailed process information
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for printing:
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.Bl -tag -width indent
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.It Fl b
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Display binary information for the process.
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.It Fl c
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Display command line arguments for the process.
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.It Fl f
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Display file descriptor information for the process.
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.It Fl k
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Display the stacks of kernel threads in the process, excluding stacks of
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threads currently running on a CPU and threads with stacks swapped to disk.
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If the flag is repeated, function offsets as well as function names are
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printed.
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.It Fl s
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Display security credential information for the process.
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.It Fl t
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Display thread information for the process.
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.It Fl v
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Display virtual memory mappings for the process.
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.El
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.Pp
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All options generate output in the format of a table, the first field of
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which is the process ID to which the row of information corresponds.
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The
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.Fl h
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flag may be used to suppress table headers.
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.Pp
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The
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.Fl w
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flag may be used to specify a wait interval at which to repeat the printing
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of the requested process information.
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If the
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.Fl w
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flag is not specified, the output will not repeat.
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.Pp
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Some information, such as VM and file descriptor information, is available
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only to the owner of a process or the superuser.
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.Ss Binary Information
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Display the process ID, command, and path to the process binary:
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.Pp
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.Bl -tag -width indent -compact
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.It PID
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process ID
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.It COMM
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command
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.It PATH
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path to process binary (if available)
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.El
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.Ss Command Line Arguments
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Display the process ID, command, and command line arguments:
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.Pp
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.Bl -tag -width indent -compact
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.It PID
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process ID
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.It COMM
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command
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.It ARGS
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command line arguments (if available)
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.El
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.Ss File Descriptors
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Display detailed information about each file descriptor referenced by a
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process, including the process ID, command, file descriptor number, and
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per-file descriptor object information, such as object type and file system
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path:
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.Pp
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.Bl -tag -width indent -compact
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.It PID
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process ID
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.It COMM
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command
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.It FD
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file descriptor number or cwd/root/jail
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.It T
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file descriptor type
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.It V
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vnode type
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.It FLAGS
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file descriptor flags
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.It REF
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file descriptor reference count
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.It OFFSET
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file descriptor offset
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.It PRO
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network protocol
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.It NAME
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file path or socket addresses (if available)
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.El
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.Pp
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The following file descriptor types may be displayed:
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.Pp
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.Bl -tag -width X -compact
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.It c
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crypto
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.It f
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fifo
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.It h
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shared memory
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.It k
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kqueue
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.It m
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message queue
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.It p
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pipe
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.It s
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socket
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.It t
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pseudo-terminal master
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.It v
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vnode
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.El
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.Pp
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The following vnode types may be displayed:
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.Pp
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.Bl -tag -width X -compact
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.It -
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not a vnode
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.It b
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block device
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.It c
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character device
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.It f
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fifo
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.It l
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symbolic link
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.It s
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socket
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.It x
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revoked device
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.El
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.Pp
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The following file descriptor flags may be displayed:
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.Pp
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.Bl -tag -width X -compact
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.It r
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read
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.It w
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write
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.It a
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append
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.It s
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async
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.It f
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fsync
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.It n
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non-blocking
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.It d
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direct I/O
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.It l
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lock held
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.El
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.Ss Kernel Thread Stacks
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Display kernel thread stacks for a process, allowing further interpretation
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of thread wait channels.
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If the
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.Fl k
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flag is reeated, function offsets, not just function names, are printed.
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.Pp
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This feature requires
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.Cd "options STACK"
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or
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.Cd "options DDB"
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to be compiled into the kernel.
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.Pp
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.Bl -tag -width indent -compact
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.It PID
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process ID
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.It TID
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thread ID
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.It COMM
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command
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.It TDNAME
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thread name
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.It KSTACK
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kernel thread call stack
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.El
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.Ss Security Credentials
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Display process credential information:
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.Pp
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.Bl -tag -width indent -compact
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.It PID
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process ID
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.It COMM
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command
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.It EUID
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effective user ID
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.It RUID
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real user ID
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.It SVUID
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saved user ID
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.It EGID
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effective group ID
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.It RGID
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real group ID
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.It SVGID
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saved group ID
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.It GROUPS
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group set
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.El
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.Ss Thread Information
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Display per-thread information, including process ID, per-thread ID, name,
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CPU, and execution state:
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.Pp
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.Bl -tag -width indent -compact
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.It PID
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process ID
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.It TID
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thread ID
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.It COMM
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command
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.It TDNAME
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thread name
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.It CPU
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current or most recent CPU run on
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.It PRI
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thread priority
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.It STATE
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thread state
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.It WCHAN
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thread wait channel
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.El
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.Ss Virtual Memory Mappings
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Display process virtual memory mappings, including addresses, mapping
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meta-data, and mapped object information:
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.Pp
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.Bl -tag -width indent -compact
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.It PID
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process ID
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.It START
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starting address of mapping
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.It END
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ending address of mapping
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.It PRT
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protection flags
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.It RES
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resident pages
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.It PRES
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private resident pages
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.It REF
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reference count
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.It SHD
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shadow page count
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.It FL
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mapping flags
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.It TP
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VM object type
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.El
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.Pp
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The following protection flags may be displayed:
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.Pp
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.Bl -tag -width X -compact
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.It r
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read
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.It w
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write
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.It x
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execute
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.El
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.Pp
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The following VM object types may be displayed:
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.Pp
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.Bl -tag -width XX -compact
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.It --
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none
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.It dd
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dead
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.It df
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default
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.It dv
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device
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.It ph
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physical
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.It sw
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swap
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.It vn
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vnode
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.El
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.Pp
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The following mapping flags may be displayed:
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.Pp
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.Bl -tag -width X -compact
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.It C
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copy-on-write
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.It N
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needs copy
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.El
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.Sh EXIT STATUS
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.Ex -std
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.Sh SEE ALSO
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.Xr fstat 1 ,
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.Xr ps 1 ,
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.Xr sockstat 1 ,
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.Xr ddb 4 ,
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.Xr stack 9
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.Sh AUTHORS
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.An Robert N M Watson
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.Sh BUGS
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Some field values may include spaces, which limits the extent to which the
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output of
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.Nm
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may be mechanically parsed.
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.Pp
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The display of open file or memory mapping pathnames is implemented using the
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kernel's name cache.
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It therefore does not work for file systems
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that do not use the name cache, such as
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.Xr devfs 4 ,
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or if the name is not present in the cache due to removal.
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.Pp
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.Nm
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currently supports extracting data only from a live kernel, and not from
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kernel crash dumps.
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