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diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -81,6 +81,7 @@
bhndb_pci.4 \
blackhole.4 \
bnxt.4 \
+ boottrace.4 \
bpf.4 \
bridge.4 \
bwi.4 \
diff --git a/share/man/man4/boottrace.4 b/share/man/man4/boottrace.4
new file mode 100644
--- /dev/null
+++ b/share/man/man4/boottrace.4
@@ -0,0 +1,220 @@
+.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+.\"
+.\" Copyright (c) 2022 NetApp, Inc.
+.\"
+.\" 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 CONTRIBUTORS 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.
+.\"
+.Dd February 28, 2022
+.Dt BOOTTRACE 4
+.Os
+.Sh NAME
+.Nm boottrace
+.Nd Boot-time, run-time, and shutdown-time tracing facility
+.Sh SYNOPSIS
+.In sys/boottrace.h
+.Sh DESCRIPTION
+.Nm
+is a kernel-userspace interface for capturing trace events
+during system boot and shutdown.
+.Pp
+Event annotations are present in:
+.Bl -bullet -compact
+.It
+the boot and shutdown paths in the
+kernel
+.It
+some key system utilities
+.Po
+.Xr init 8 ,
+.Xr shutdown 8 ,
+.Xr reboot 8
+.Pc
+.It
+.Xr rc 8
+scripts
+.El
+.Pp
+.Nm
+is unconditionally compiled into the kernel and
+disabled by default.
+.Sh EVENT TABLES
+Events are stored in three event tables: boot-time events, run-time events,
+and shutdown-time events.
+.Bl -column "shutdown-time events" ""
+.It Sy Table Name Ta Sy Event Description
+.It boot-time events Ta Boot, kernel initialization, and
+.Xr rc 8
+execution;
+.Xo
+until
+.Xr init 8
+transitions into multi-user mode
+.Xc
+.It run-time events Ta Xo
+From when the system has completed booting (including
+.Xr rc 8
+execution) and
+.Xr init 8
+transitions to multi-user mode
+until the beginning of shutdown procedures
+.Xc
+.It shutdown-time events Ta Xo
+After initialization of a shutdown, a reboot, or a kernel panic
+.Xc
+.El
+.Sh LOADER TUNABLES
+Tunables can be set at the
+.Xr loader 8
+prompt before booting the kernel or stored in
+.Xr loader.conf 5 .
+.Nm
+features the following loader tunables:
+.Bl -tag -width indent
+.It Va kern.boottrace.dotrace_kernel
+Set to
+.Ql 1
+to enable tracing of kernel events.
+Default:
+.Ql 1
+.Pq enabled .
+.It Va kern.boottrace.dotrace_user
+Set to
+.Ql 1
+to enable tracing of userspace events.
+Default:
+.Ql 1
+.Pq enabled .
+.El
+.Sh SYSCTL VARIABLES
+The following variables are available as both
+.Xr sysctl 8
+variables and
+.Xr loader 8
+tunables:
+.Bl -tag -width indent
+.It Va kern.boottrace.boottrace
+Create a new trace event and write it to the boot-time table.
+.Pp
+A new trace event consists of a process name and an event description,
+separated by a colon
+.Pq Ql \&: .
+If the colon is missing or if the provided string for the process name is empty,
+the process name is inferred from the invoking process
+.Pq which is its executable name .
+.It Va kern.boottrace.enabled
+Set to
+.Ql 1
+to enable tracing.
+This is a read-only
+.Xr sysctl 8
+variable.
+Default:
+.Ql 0
+.Pq disabled .
+.It Va kern.boottrace.log
+Show the events stored in boot-time and run-time
+tables.
+This
+is an opaque
+.Xr sysctl 8
+variable.
+.It Va kern.boottrace.runtrace
+Same as
+.Va kern.boottrace.boottrace ,
+but write to the run-time table.
+.It Va kern.boottrace.shuttrace
+Same as
+.Va kern.boottrace.boottrace ,
+but write to the shutdown-time table.
+.It Va kern.boottrace.shutdown_trace
+Log shutdown-time events to the console before the system halts.
+.It Va kern.boottrace.shutdown_trace_threshold
+Set a time threshold for logging shutdown-time events in milliseconds.
+An event is ignored
+if the time difference to the previous event is less than
+the threshold value.
+Default:
+.Ql 0
+.Pq logs all events .
+.El
+.Sh EXAMPLES
+Create a new trace event with a process name
+.Dq foo
+and an event description
+.Dq bar
+using
+.Xr sysctl 8 :
+.Bd -literal -offset indent
+sysctl kern.boottrace.boottrace="foo:bar"
+.Ed
+.Pp
+Here is a sample output of
+.Va kern.boottrace.log
+.Po shortened with
+.Dq [...]
+for readability
+.Pc :
+.Bd -literal
+CPU msecs delta process event PID CPUtime IBlks OBlks
+ 0 44872811 0 kernel sysinit 0x2100001 0 0.00 0 0
+ 0 44872812 1 kernel sysinit 0x2110000 0 0.00 0 0
+ 0 44872812 0 kernel sysinit 0x2140000 0 0.00 0 0
+[...]
+ 0 44872817 0 kernel sysinit 0x2800000 0 0.00 0 0
+ 0 44873820 1003 kernel sysinit 0x2880000 0 0.00 0 0
+ 0 44873820 0 kernel sysinit 0x2888000 0 0.00 0 0
+[...]
+ 1 44875735 0 kernel sysinit 0xfffffff 0 0.00 0 0
+ 1 44875735 0 swapper mi_startup done 0 0.00 0 0
+ 0 44875750 15 init init(8) starting... 1 0.00 0 0
+ 0 44875751 1 init /etc/rc starting... 1 0.00 0 0
+ 0 44875831 80 boottrace /etc/rc.d/rctl start 26 0.00 0 0
+ 1 44875839 8 boottrace /etc/rc.d/rctl done 26 0.00 2 0
+[...]
+ 0 44876446 0 boottrace /etc/rc.d/netif start 390 0.00 0 0
+ 1 44881116 4670 boottrace /etc/rc.d/netif done 390 0.12 34 0
+[...]
+ 0 44882866 1 boottrace /etc/rc.d/securelevel start 1679 0.00 0 0
+ 0 44882872 6 boottrace /etc/rc.d/securelevel done 1679 0.00 0 0
+ 1 44882879 7 init /etc/rc finished 1 2.22 743 15
+Total measured time: 10068 msecs
+
+
+CPU msecs delta process event PID CPUtime IBlks OBlks
+ 1 44882880 0 init multi-user start 1 2.22 743 15
+ 0 44918215 35335 kldload hwpmc.ko: sysinit 0xd800000 1698 0.00 0 0
+Total measured time: 35335 msecs
+.Ed
+.Sh SEE ALSO
+.Xr boottrace 8 ,
+.Xr sysctl 8
+.Sh HISTORY
+NetApp created
+.Nm
+to diagnose slow devices and subsystems.
+Once upstreamed,
+.Nm
+was first publicly released with
+.Fx 14.0 .
+.Sh AUTHORS
+This manual page was written by
+.An Mateusz Piotrowski Aq Mt 0mp@FreeBSD.org .

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