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+//po4a: entry man manual
+////
+chrt(1) manpage
+
+Copyright (C) 2004 Robert Love
+Copyright (C) 2015 Karel Zak <kzak@redhat.com>
+
+This is free documentation; you can redistribute it and/or
+modify it under the terms of the GNU General Public License,
+version 2, as published by the Free Software Foundation.
+
+The GNU General Public License's references to "object code"
+and "executables" are to be interpreted as the output of any
+document formatting or typesetting system, including
+intermediate and printed output.
+
+This manual is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+////
+= chrt(1)
+:doctype: manpage
+:man manual: User Commands
+:man source: util-linux {release-version}
+:page-layout: base
+:command: chrt
+:colon: :
+
+== NAME
+
+chrt - manipulate the real-time attributes of a process
+
+== SYNOPSIS
+
+*chrt* [options] _priority command argument_ ...
+
+*chrt* [options] *-p* [_priority_] _PID_
+
+== DESCRIPTION
+
+*chrt* sets or retrieves the real-time scheduling attributes of an existing _PID_, or runs _command_ with the given attributes.
+
+== POLICIES
+
+*-o*, *--other*::
+Set scheduling policy to *SCHED_OTHER* (time-sharing scheduling). This is the default Linux scheduling policy.
+
+*-f*, *--fifo*::
+Set scheduling policy to *SCHED_FIFO* (first in-first out).
+
+*-r*, *--rr*::
+Set scheduling policy to *SCHED_RR* (round-robin scheduling). When no policy is defined, the *SCHED_RR* is used as the default.
+
+*-b*, *--batch*::
+Set scheduling policy to *SCHED_BATCH* (scheduling batch processes). Linux-specific, supported since 2.6.16. The priority argument has to be set to zero.
+
+*-i*, *--idle*::
+Set scheduling policy to *SCHED_IDLE* (scheduling very low priority jobs). Linux-specific, supported since 2.6.23. The priority argument has to be set to zero.
+
+*-d*, *--deadline*::
+Set scheduling policy to *SCHED_DEADLINE* (sporadic task model deadline scheduling). Linux-specific, supported since 3.14. The priority argument has to be set to zero. See also *--sched-runtime*, *--sched-deadline* and *--sched-period*. The relation between the options required by the kernel is runtime <= deadline <= period. *chrt* copies _period_ to _deadline_ if *--sched-deadline* is not specified and _deadline_ to _runtime_ if *--sched-runtime* is not specified. It means that at least *--sched-period* has to be specified. See *sched*(7) for more details.
+
+== SCHEDULING OPTIONS
+
+*-T*, *--sched-runtime* _nanoseconds_::
+Specifies runtime parameter for *SCHED_DEADLINE* policy (Linux-specific).
+
+*-P*, *--sched-period* _nanoseconds_::
+Specifies period parameter for *SCHED_DEADLINE* policy (Linux-specific). Note that the kernel's lower limit is 100 milliseconds.
+
+*-D*, *--sched-deadline* _nanoseconds_::
+Specifies deadline parameter for *SCHED_DEADLINE* policy (Linux-specific).
+
+*-R*, *--reset-on-fork*::
+Use *SCHED_RESET_ON_FORK* or *SCHED_FLAG_RESET_ON_FORK* flag. Linux-specific, supported since 2.6.31.
++
+Each thread has a _reset-on-fork_ scheduling flag. When this flag is set, children created by *fork*(2) do not inherit privileged scheduling policies. After the _reset-on-fork_ flag has been enabled, it can be reset only if the thread has the *CAP_SYS_NICE* capability. This flag is disabled in child processes created by *fork*(2).
++
+More precisely, if the _reset-on-fork_ flag is set, the following rules apply for subsequently created children:
++
+* If the calling thread has a scheduling policy of *SCHED_FIFO* or *SCHED_RR*, the policy is reset to *SCHED_OTHER* in child processes.
++
+* If the calling process has a negative nice value, the nice value is reset to zero in child processes.
+
+== OPTIONS
+
+*-a*, *--all-tasks*::
+Set or retrieve the scheduling attributes of all the tasks (threads) for a given PID.
+
+*-m*, *--max*::
+Show minimum and maximum valid priorities, then exit.
+
+*-p*, *--pid*::
+Operate on an existing PID and do not launch a new task.
+
+*-v*, *--verbose*::
+Show status information.
+
+include::man-common/help-version.adoc[]
+
+== EXAMPLES
+
+//TRANSLATORS: Keep {colon} untranslated
+The default behavior is to run a new command{colon}::
+____
+*chrt* _priority_ _command_ [_arguments_]
+____
+//TRANSLATORS: Keep {colon} untranslated
+You can also retrieve the real-time attributes of an existing task{colon}::
+____
+*chrt -p* _PID_
+____
+//TRANSLATORS: Keep {colon} untranslated
+Or set them{colon}::
+____
+*chrt -r -p* _priority PID_
+____
+This, for example, sets real-time scheduling to priority _30_ for the process _PID_ with the *SCHED_RR* (round-robin) class{colon}::
+____
+*chrt -r -p 30* _PID_
+____
+Reset priorities to default for a process{colon}::
+____
+*chrt -o -p 0* _PID_
+____
+See *sched*(7) for a detailed discussion of the different scheduler classes and how they interact.
+
+== PERMISSIONS
+
+A user must possess *CAP_SYS_NICE* to change the scheduling attributes of a process. Any user can retrieve the scheduling information.
+
+== NOTES
+
+Only *SCHED_FIFO*, *SCHED_OTHER* and *SCHED_RR* are part of POSIX 1003.1b Process Scheduling. The other scheduling attributes may be ignored on some systems.
+
+Linux' default scheduling policy is *SCHED_OTHER*.
+
+== AUTHORS
+
+mailto:rml@tech9.net[Robert Love],
+mailto:kzak@redhat.com[Karel Zak]
+
+== SEE ALSO
+
+*nice*(1),
+*renice*(1),
+*taskset*(1),
+*sched*(7)
+
+See *sched_setscheduler*(2) for a description of the Linux scheduling scheme.
+
+include::man-common/bugreports.adoc[]
+
+include::man-common/footer.adoc[]
+
+ifdef::translation[]
+include::man-common/translation.adoc[]
+endif::[]