1.\" $NetBSD: cpuctl.8,v 1.2 2008/03/25 15:06:02 martin Exp $ 2.\" 3.\" Copyright (c) 2007 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Andrew Doran. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the NetBSD 20.\" Foundation, Inc. and its contributors. 21.\" 4. Neither the name of The NetBSD Foundation nor the names of its 22.\" contributors may be used to endorse or promote products derived 23.\" from this software without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" 37.Dd August 3, 2007 38.Dt CPUCTL 8 39.Os 40.Sh NAME 41.Nm cpuctl 42.Nd a program to control CPUs 43.Sh SYNOPSIS 44.Nm cpuctl 45.Ar command 46.Op Ar arguments 47.Sh DESCRIPTION 48The 49.Nm 50command can be used to control and inspect the state of CPUs in the system. 51.Pp 52The first argument, 53.Ar command , 54specifies the action to take. 55Valid commands are: 56.Bl -tag -width xx 57.It list 58.Pp 59For each CPU in the system, display the current state and time of the last 60state change. 61.It offline Ar cpuno 62.Pp 63Set the specified CPU off line. 64.Pp 65Unbound LWPs (lightweight processes) will not be executed on the CPU 66while it is off line. 67Bound LWPs will continue to be executed on the CPU, and device interrupts 68routed to the CPU will continue to be handled. 69A future release of the system may allow device interrupts to be re-routed 70away from individual CPUs. 71.Pp 72At least one CPU in the system must remain on line. 73.It online Ar cpuno 74.Pp 75Set the specified CPU on line, making it available to run unbound LWPs. 76.El 77.Pp 78.Sh FILES 79.Bl -tag -width /dev/cpuctl -compact 80.It Pa /dev/cpuctl 81control device 82.El 83.Sh HISTORY 84The 85.Nm 86command first appeared in 87.Nx 5.0 . 88