rename man page to a real function name

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diff --git a/share/man/man9/ctxsw.9 b/share/man/man9/ctxsw.9
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-.\"	$OpenBSD: ctxsw.9,v 1.13 2007/10/10 16:21:29 art Exp $
-.\"	$NetBSD: ctxsw.9,v 1.9 1999/03/06 22:09:29 mycroft Exp $
-.\"
-.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to The NetBSD Foundation
-.\" by Paul Kranenburg.
-.\"
-.\" 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.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"        This product includes software developed by the NetBSD
-.\"        Foundation, Inc. and its contributors.
-.\" 4. Neither the name of The NetBSD Foundation nor the names of its
-.\"    contributors may be used to endorse or promote products derived
-.\"    from this software without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 $Mdocdate: October 10 2007 $
-.Dt CTXSW 9
-.Os
-.Sh NAME
-.Nm mi_switch ,
-.Nm cpu_switchto
-.Nd switch to another process context
-.Sh SYNOPSIS
-.Fd #include <sys/param.h>
-.Fd #include <sys/proc.h>
-.Ft void
-.Fn mi_switch "void"
-.Ft void
-.Fn cpu_switchto "struct proc *old" "struct proc *new"
-.Sh DESCRIPTION
-The
-.Fn mi_switch
-function implements the machine-independent prelude to a process context
-switch.
-It is called from only a few distinguished places in the kernel code as a
-result of the principle of non-preemptable kernel mode execution.
-The three major uses of
-.Fn mi_switch
-can be enumerated as follows:
-.Bl -enum -offset indent
-.It
-From within
-.Xr tsleep 9
-when the current process
-voluntarily relinquishes the CPU to wait for some resource to become
-available.
-.It
-After handling a trap
-.Pq e.g., a system call or device interrupt
-when the kernel prepares a return to user-mode execution.
-This case is typically handled by machine-dependent trap-handling code after
-detection of a change in the signal disposition of the current process, or
-when a higher priority process might be available to run.
-The latter event is communicated by the machine-independent scheduling
-routines by calling the machine-dependent
-.Fn need_resched "void" .
-.It
-In the signal handling code
-.Pq see Xr issignal 9
-if a signal is delivered that causes a process to stop.
-.El
-.Pp
-.Fn mi_switch
-records the amount of time the current process has been running in the
-process structure and checks this value against the CPU time limits
-allocated to the process
-.Pq see Xr getrlimit 2 .
-Exceeding the soft limit results in a
-.Dv SIGXCPU
-signal to be posted to the process, while exceeding the hard limit will
-cause a
-.Dv SIGKILL .
-For a process which accumulated longer than 10 minutes of
-CPU time, its nice level is raised to 4.
-After these administrative tasks are done,
-.Fn mi_switch
-chooses the next process to run and hands over control to the machine
-dependent routine
-.Fn cpu_switchto ,
-which will perform the actual process context switch.
-.Pp
-.Fn cpu_switchto
-will save the context of the old process and switch to the new one.
-A special case is when the old process is
-.Dv NULL
-which means that the old process has exited and doesn't need to be
-saved.
-.Pp
-Note that
-.Fn mi_switch
-and thus
-.Fn cpu_switchto
-should be called at
-.Xr splhigh 9 .
-.Sh SEE ALSO
-.Xr spl 9 ,
-.Xr tsleep 9 ,
-.Xr wakeup 9