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+.\" 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.
+.\"
+.TH CHRT 1 "January 2016" "util-linux" "User Commands"
+.SH NAME
+chrt \- manipulate the real-time attributes of a process
+.SH SYNOPSIS
+.B chrt
+[options]
+.IR priority\ command\  [ argument ...]
+.br
+.B chrt
+[options]
+.B \-p
+.RI [ priority ]\  pid
+.SH DESCRIPTION
+.PP
+.B chrt
+sets or retrieves the real-time scheduling attributes of an existing \fIpid\fR,
+or runs \fIcommand\fR with the given attributes.
+
+.SH POLICIES
+.TP
+\fB\-o\fR, \fB\-\-other\fR
+Set scheduling policy to
+.BR SCHED_OTHER .
+This is the default Linux scheduling policy.
+.TP
+\fB\-f\fR, \fB\-\-fifo\fR
+Set scheduling policy to \fBSCHED_FIFO\fR.
+.TP
+\fB\-r\fR, \fB\-\-rr\fR
+Set scheduling policy to
+.BR SCHED_RR .
+When no policy is defined, the
+.B SCHED_RR
+is used as the default.
+.TP
+\fB\-b\fR, \fB\-\-batch\fR
+Set scheduling policy to
+.B SCHED_BATCH
+(Linux-specific, supported since 2.6.16).  The priority argument has to be set to zero.
+.TP
+\fB\-i\fR, \fB\-\-idle\fR
+Set scheduling policy to
+.B SCHED_IDLE
+(Linux-specific, supported since 2.6.23).  The priority argument has to be set to zero.
+.TP
+.BR -d ,\  --deadline
+Set scheduling policy to
+.B SCHED_DEADLINE
+(Linux-specific, supported since 3.14).  The priority argument has to be set to zero.
+See also \fB\-\-sched\-runtime\fR, \fB\-\-sched\-deadline\fR and
+\fB\-\-sched\-period\fR.  The relation between the options required by the kernel is
+runtime <= deadline <= period.
+.B chrt
+copies \fIperiod\fR to \fIdeadline\fR if \fB\-\-sched\-deadline\fR is not specified and
+\fIdeadline\fR to \fIruntime\fR if \fB\-\-sched\-runtime\fR is not specified.
+It means that at least \fB\-\-sched\-period\fR has to be specified.  See
+.BR sched (7)
+for more details.
+
+.SH "SCHEDULING OPTIONS"
+.TP
+\fB\-T\fR, \fB\-\-sched\-runtime\fR \fInanoseconds\fR
+Specifies runtime parameter for SCHED_DEADLINE policy (Linux-specific).
+.TP
+\fB\-P\fR, \fB\-\-sched\-period\fR \fInanoseconds\fR
+Specifies period parameter for SCHED_DEADLINE policy (Linux-specific).
+.TP
+\fB\-D\fR, \fB\-\-sched\-deadline\fR \fInanoseconds\fR
+Specifies deadline parameter for SCHED_DEADLINE policy (Linux-specific).
+.TP
+\fB\-R\fR, \fB\-\-reset-on-fork\fR
+Add
+.B SCHED_RESET_ON_FORK
+flag to the
+.B SCHED_FIFO
+or
+.B SCHED_RR
+scheduling policy (Linux-specific, supported since 2.6.31).
+
+.SH OPTIONS
+.TP
+.BR -a ,\  --all-tasks
+Set or retrieve the scheduling attributes of all the tasks (threads) for a
+given PID.
+.TP
+.BR -m ,\  --max
+Show minimum and maximum valid priorities, then exit.
+.TP
+.BR -p ,\  --pid
+Operate on an existing PID and do not launch a new task.
+.TP
+.BR -v ,\  --verbose
+Show status information.
+.TP
+.BR -V ,\  --version
+Display version information and exit.
+.TP
+.BR -h ,\  --help
+Display help text and exit.
+.SH USAGE
+.TP
+The default behavior is to run a new command:
+.B chrt
+.I priority
+.IR command\  [ arguments ]
+.TP
+You can also retrieve the real-time attributes of an existing task:
+.B chrt \-p
+.I pid
+.TP
+Or set them:
+.B chrt \-r \-p
+.I priority pid
+.SH PERMISSIONS
+A user must possess
+.B CAP_SYS_NICE
+to change the scheduling attributes of a process.  Any user can retrieve the
+scheduling information.
+
+.SH NOTES
+Only
+.BR SCHED_FIFO ,
+.B SCHED_OTHER
+and
+.B SCHED_RR
+are part of POSIX 1003.1b Process Scheduling.  The other scheduling attributes
+may be ignored on some systems.
+.P
+Linux' default scheduling policy is
+.BR SCHED_OTHER .
+.SH SEE ALSO
+.BR nice (1),
+.BR renice (1),
+.BR taskset (1),
+.BR sched (7)
+.sp
+See
+.BR sched_setscheduler (2)
+for a description of the Linux scheduling scheme.
+.SH AUTHORS
+.UR rml@tech9.net
+Robert Love
+.UE
+.br
+.UR kzak@redhat.com
+Karel Zak
+.UE
+.SH AVAILABILITY
+The chrt command is part of the util-linux package and is available from
+https://www.kernel.org/pub/linux/utils/util-linux/.