88 lines
3.1 KiB
Groff
88 lines
3.1 KiB
Groff
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.\" $NetBSD: cpuctl.8,v 1.1 2007/08/04 11:03:05 ad Exp $
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.\"
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.\" Copyright (c) 2007 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Andrew Doran.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd August 3, 2007
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.Dt CPUCTL 8
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.Os
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.Sh NAME
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.Nm cpuctl
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.Nd a program to control CPUs
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.Sh SYNOPSIS
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.Nm cpuctl
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.Ar command
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.Op Ar arguments
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.Sh DESCRIPTION
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The
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.Nm
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command can be used to control and inspect the state of CPUs in the system.
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.Pp
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The first argument,
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.Ar command ,
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specifies the action to take.
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Valid commands are:
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.Bl -tag -width xx
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.It list
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.Pp
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For each CPU in the system, display the current state and time of the last
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state change.
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.It offline Ar cpuid
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.Pp
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Set the specified CPU off line.
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.Pp
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Unbound LWPs (lightweight processes) will not be executed on the CPU
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while it is off line.
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Bound LWPs will continue to be executed on the CPU, and device interrupts
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routed to the CPU will continue to be handled.
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A future release of the system may allow device interrupts to be re-routed
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away from individual CPUs.
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.Pp
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At least one CPU in the system must remain on line.
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.It online Ar cpuid
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.Pp
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Set the specified CPU on line, making it available to run unbound LWPs.
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.El
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.Pp
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.Sh FILES
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.Bl -tag -width /dev/cpuctl -compact
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.It Pa /dev/cpuctl
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control device
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.El
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.Sh HISTORY
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The
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.Nm
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command first appeared in
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.Nx 5.0 .
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