mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-26 11:47:31 +00:00
ae34b6ff96
for limiting disk (actually filesystem) IO. Note that in some cases these limits are not quite precise. It's ok, as long as it's within some reasonable bounds. Testing - and review of the code, in particular the VFS and VM parts - is very welcome. MFC after: 1 month Relnotes: yes Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D5080
323 lines
8.6 KiB
Groff
323 lines
8.6 KiB
Groff
.\"-
|
|
.\" Copyright (c) 2009 Edward Tomasz Napierala
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR THE VOICES IN HIS HEAD BE
|
|
.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
.\" POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd January 30, 2016
|
|
.Dt RCTL 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm rctl
|
|
.Nd display and update resource limits database
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl h
|
|
.Op Fl n
|
|
.Op Ar filter Ar ...
|
|
.Nm
|
|
.Fl a
|
|
.Ar rule Ar ...
|
|
.Nm
|
|
.Fl l
|
|
.Op Fl h
|
|
.Op Fl n
|
|
.Ar filter Ar ...
|
|
.Nm
|
|
.Fl r
|
|
.Ar filter Ar ...
|
|
.Nm
|
|
.Fl u
|
|
.Op Fl h
|
|
.Ar filter Ar ...
|
|
.Pp
|
|
.Nm
|
|
requires the kernel to be compiled with:
|
|
.Bd -ragged -offset indent
|
|
.Cd "options RACCT"
|
|
.Cd "options RCTL"
|
|
.Ed
|
|
.Sh DESCRIPTION
|
|
When called without options, the
|
|
.Nm
|
|
command writes currently defined RCTL rules to standard output.
|
|
.Pp
|
|
If a
|
|
.Ar filter
|
|
argument is specified, only rules matching the filter are displayed.
|
|
The options are as follows:
|
|
.Bl -tag -width indent
|
|
.It Fl a Ar rule
|
|
Add
|
|
.Ar rule
|
|
to the RCTL database.
|
|
.It Fl l Ar filter
|
|
Display rules applicable to the process defined by
|
|
.Ar filter .
|
|
Note that this is different from showing the rules when called without
|
|
any options, as it shows not just the rules with subject equal to that
|
|
of process, but also rules for the user, jail, and login class applicable
|
|
to the process.
|
|
.It Fl r Ar filter
|
|
Remove rules matching
|
|
.Ar filter
|
|
from the RCTL database.
|
|
.It Fl u Ar filter
|
|
Display resource usage for a subject
|
|
.Po
|
|
.Sy process ,
|
|
.Sy user ,
|
|
.Sy loginclass
|
|
or
|
|
.Sy jail
|
|
.Pc
|
|
matching the
|
|
.Ar filter .
|
|
.It Fl h
|
|
"Human-readable" output.
|
|
Use unit suffixes: Byte, Kilobyte, Megabyte,
|
|
Gigabyte, Terabyte and Petabyte.
|
|
.It Fl n
|
|
Display user IDs numerically rather than converting them to a user name.
|
|
.El
|
|
.Pp
|
|
Modifying rules affects all currently running and future processes matching
|
|
the rule.
|
|
.Sh RULE SYNTAX
|
|
Syntax for a rule is subject:subject-id:resource:action=amount/per.
|
|
.Pp
|
|
.Bl -tag -width "subject-id" -compact -offset indent
|
|
.It subject
|
|
defines the kind of entity the rule applies to.
|
|
It can be either
|
|
.Sy process ,
|
|
.Sy user ,
|
|
.Sy loginclass ,
|
|
or
|
|
.Sy jail .
|
|
.It subject-id
|
|
identifies the
|
|
.Em subject .
|
|
It can be a process ID, user name, numerical user ID, login class name from
|
|
.Xr login.conf 5 ,
|
|
or jail name.
|
|
.It resource
|
|
identifies the resource the rule controls.
|
|
See the
|
|
.Sx RESOURCES
|
|
section below for details.
|
|
.It action
|
|
defines what will happen when a process exceeds the allowed
|
|
.Em amount .
|
|
See the
|
|
.Sx ACTIONS
|
|
section below for details.
|
|
.It amount
|
|
defines how much of the resource a process can use before
|
|
the defined
|
|
.Em action
|
|
triggers.
|
|
Resources which limit bytes may use prefixes from
|
|
.Xr expand_number 3 .
|
|
.It per
|
|
defines what entity the
|
|
.Em amount
|
|
gets accounted for.
|
|
For example, rule "loginclass:users:vmem:deny=100M/process" means
|
|
that each process of any user belonging to login class "users" may allocate
|
|
up to 100MB of virtual memory.
|
|
Rule "loginclass:users:vmem:deny=100M/user" would mean that for each
|
|
user belonging to the login class "users", the sum of virtual memory allocated
|
|
by all the processes of that user will not exceed 100MB.
|
|
Rule "loginclass:users:vmem:deny=100M/loginclass" would mean that the sum of
|
|
virtual memory allocated by all processes of all users belonging to that login
|
|
class will not exceed 100MB.
|
|
.El
|
|
.Pp
|
|
A valid rule has all those fields specified, except for
|
|
.Em per ,
|
|
which defaults
|
|
to the value of
|
|
.Em subject .
|
|
.Pp
|
|
A filter is a rule for which one of more fields other than
|
|
.Em per
|
|
is left empty.
|
|
For example, a filter that matches every rule could be written as ":::=/",
|
|
or, in short, ":".
|
|
A filter that matches all the login classes would be "loginclass:".
|
|
A filter that matches all defined rules for
|
|
.Sy maxproc
|
|
resource would be
|
|
"::maxproc".
|
|
.Sh SUBJECTS
|
|
.Bl -column -offset 3n "pseudoterminals" ".Sy username or numerical User ID"
|
|
.It Em subject Ta Em subject-id
|
|
.It Sy process Ta numerical Process ID
|
|
.It Sy user Ta user name or numerical User ID
|
|
.It Sy loginclass Ta login class from
|
|
.Xr login.conf 5
|
|
.It Sy jail Ta jail name
|
|
.El
|
|
.Sh RESOURCES
|
|
.Bl -column -offset 3n "pseudoterminals"
|
|
.It Em resource
|
|
.It Sy cputime Ta "CPU time, in seconds"
|
|
.It Sy datasize Ta "data size, in bytes"
|
|
.It Sy stacksize Ta "stack size, in bytes"
|
|
.It Sy coredumpsize Ta "core dump size, in bytes"
|
|
.It Sy memoryuse Ta "resident set size, in bytes"
|
|
.It Sy memorylocked Ta "locked memory, in bytes"
|
|
.It Sy maxproc Ta "number of processes"
|
|
.It Sy openfiles Ta "file descriptor table size"
|
|
.It Sy vmemoryuse Ta "address space limit, in bytes"
|
|
.It Sy pseudoterminals Ta "number of PTYs"
|
|
.It Sy swapuse Ta "swap space that may be reserved or used, in bytes"
|
|
.It Sy nthr Ta "number of threads"
|
|
.It Sy msgqqueued Ta "number of queued SysV messages"
|
|
.It Sy msgqsize Ta "SysV message queue size, in bytes"
|
|
.It Sy nmsgq Ta "number of SysV message queues"
|
|
.It Sy nsem Ta "number of SysV semaphores"
|
|
.It Sy nsemop Ta "number of SysV semaphores modified in a single semop(2) call"
|
|
.It Sy nshm Ta "number of SysV shared memory segments"
|
|
.It Sy shmsize Ta "SysV shared memory size, in bytes"
|
|
.It Sy wallclock Ta "wallclock time, in seconds"
|
|
.It Sy pcpu Ta "%CPU, in percents of a single CPU core"
|
|
.It Sy readbps Ta "filesystem reads, in bytes per second"
|
|
.It Sy writebps Ta "filesystem writes, in bytes per second"
|
|
.It Sy readiops Ta "filesystem reads, in operations per second"
|
|
.It Sy writeiops Ta "filesystem writes, in operations per second"
|
|
.El
|
|
.Sh ACTIONS
|
|
.Bl -column -offset 3n "pseudoterminals"
|
|
.It Em action
|
|
.It Sy deny Ta deny the allocation; not supported for
|
|
.Sy cputime ,
|
|
.Sy wallclock ,
|
|
.Sy readbps ,
|
|
.Sy writebps ,
|
|
.Sy readiops ,
|
|
and
|
|
.Sy writeiops
|
|
.It Sy log Ta "log a warning to the console"
|
|
.It Sy devctl Ta "send notification to"
|
|
.Xr devd 8
|
|
using
|
|
.Sy system
|
|
= "RCTL",
|
|
.Sy subsystem
|
|
= "rule",
|
|
.Sy type
|
|
= "matched"
|
|
.It sig* e.g.
|
|
.Sy sigterm ;
|
|
send a signal to the offending process.
|
|
See
|
|
.Xr signal 3
|
|
for a list of supported signals
|
|
.It Sy throttle Ta "slow down process execution"; only supported for
|
|
.Sy readbps ,
|
|
.Sy writebps ,
|
|
.Sy readiops ,
|
|
and
|
|
.Sy writeiops .
|
|
.El
|
|
.Pp
|
|
Not all actions are supported for all resources.
|
|
Attempting to add a rule with an action not supported by a given resource will
|
|
result in error.
|
|
.Sh LOADER TUNABLES
|
|
Tunables can be set at the
|
|
.Xr loader 8
|
|
prompt, or
|
|
.Xr loader.conf 5 .
|
|
.Bl -tag -width indent
|
|
.It Va kern.racct.enable: No 1
|
|
Enable
|
|
.Nm .
|
|
This defaults to 1, unless
|
|
.Cd "options RACCT_DEFAULT_TO_DISABLED"
|
|
is set in the kernel configuration file.
|
|
.El
|
|
.Sh EXIT STATUS
|
|
.Ex -std
|
|
.Sh EXAMPLES
|
|
Prevent user "joe" from allocating more than 1GB of virtual memory:
|
|
.Dl Nm Fl a Ar user:joe:vmemoryuse:deny=1g
|
|
.Pp
|
|
Remove all RCTL rules:
|
|
.Dl Nm Fl r Ar \&:
|
|
.Pp
|
|
Display resource usage information for jail named "www":
|
|
.Dl Nm Fl hu Ar jail:www
|
|
.Pp
|
|
Display all the rules applicable to process with PID 512:
|
|
.Dl Nm Fl l Ar process:512
|
|
.Pp
|
|
Display all rules:
|
|
.Dl Nm
|
|
.Pp
|
|
Display all rules matching user "joe":
|
|
.Dl Nm Ar user:joe
|
|
.Pp
|
|
Display all rules matching login classes:
|
|
.Dl Nm Ar loginclass:
|
|
.Sh SEE ALSO
|
|
.Xr rctl.conf 5
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
command appeared in
|
|
.Fx 9.0 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The
|
|
.Nm
|
|
was developed by
|
|
.An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org
|
|
under sponsorship from the FreeBSD Foundation.
|
|
.Sh BUGS
|
|
Limiting
|
|
.Sy memoryuse
|
|
may kill the machine due to thrashing.
|
|
.Pp
|
|
The
|
|
.Sy readiops
|
|
and
|
|
.Sy writeiops
|
|
counters are only approximations.
|
|
Like
|
|
.Sy readbps
|
|
and
|
|
.Sy writebps ,
|
|
they are calculated in the filesystem layer, where it is difficult
|
|
or even impossible to observe actual disk device operations.
|
|
.Pp
|
|
The
|
|
.Sy writebps
|
|
and
|
|
.Sy writeiops
|
|
resources generally account for writes to the filesystem cache,
|
|
not to actual devices.
|