From owner-freebsd-sparc64@FreeBSD.ORG Tue Jan 17 18:41:15 2006 Return-Path: X-Original-To: freebsd-sparc64@freebsd.org Delivered-To: freebsd-sparc64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id DBFD316A41F for ; Tue, 17 Jan 2006 18:41:14 +0000 (GMT) (envelope-from jhb@freebsd.org) Received: from speedfactory.net (mail6.speedfactory.net [66.23.216.219]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1C07F43D5A for ; Tue, 17 Jan 2006 18:41:13 +0000 (GMT) (envelope-from jhb@freebsd.org) Received: from server.baldwin.cx (unverified [66.23.211.162]) by speedfactory.net (SurgeMail 3.5b3) with ESMTP id 6286311 for multiple; Tue, 17 Jan 2006 13:39:49 -0500 Received: from localhost (john@localhost [127.0.0.1]) by server.baldwin.cx (8.13.4/8.13.4) with ESMTP id k0HIf9kD039570; Tue, 17 Jan 2006 13:41:10 -0500 (EST) (envelope-from jhb@freebsd.org) From: John Baldwin To: Joseph Koshy Date: Tue, 17 Jan 2006 13:14:03 -0500 User-Agent: KMail/1.9.1 References: <20060116185354.GA22674@SDF.LONESTAR.ORG> <200601171206.48133.jhb@freebsd.org> <84dead720601170928r567711d3t31cd297acb755989@mail.gmail.com> In-Reply-To: <84dead720601170928r567711d3t31cd297acb755989@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200601171314.05251.jhb@freebsd.org> X-Virus-Scanned: ClamAV 0.87.1/1244/Tue Jan 17 03:46:07 2006 on server.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-1.4 required=4.2 tests=ALL_TRUSTED autolearn=failed version=3.1.0 X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on server.baldwin.cx X-Server: High Performance Mail Server - http://surgemail.com r=1653887525 Cc: freebsd-sparc64@freebsd.org Subject: Re: Command to start and stop a cpu X-BeenThere: freebsd-sparc64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the Sparc List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Jan 2006 18:41:15 -0000 On Tuesday 17 January 2006 12:28, Joseph Koshy wrote: > > I think that is x86-only though. I don't think there is > > support for that on sparc64. > > SCHED_4BSD uses hlt_cpus_mask. Yes, but only i386 and amd64 actually set it and use it to keep CPUs idle: % kgrep hlt_cpus_mask amd64/amd64/mp_machdep.c: mask = hlt_cpus_mask; amd64/amd64/mp_machdep.c: hlt_cpus_mask = mask; amd64/amd64/mp_machdep.c: hlt_cpus_mask |= logical_cpus_mask; amd64/amd64/mp_machdep.c: hlt_cpus_mask &= ~logical_cpus_mask; amd64/amd64/mp_machdep.c: hlt_cpus_mask |= hyperthreading_cpus_mask; amd64/amd64/mp_machdep.c: if ((hlt_cpus_mask & all_cpus) == all_cpus) amd64/amd64/mp_machdep.c: hlt_cpus_mask &= ~(1<<0); amd64/amd64/mp_machdep.c: hlt_cpus_mask &= ~hyperthreading_cpus_mask; amd64/amd64/mp_machdep.c: hlt_cpus_mask |= hyperthreading_cpus_mask; amd64/amd64/mp_machdep.c: (hlt_cpus_mask & logical_cpus_mask) == logical_cpus_mask) amd64/amd64/mp_machdep.c: if ((hlt_cpus_mask & all_cpus) == all_cpus) amd64/amd64/mp_machdep.c: hlt_cpus_mask &= ~(1<<0); amd64/amd64/mp_machdep.c: hlt_cpus_mask |= logical_cpus_mask; amd64/amd64/mp_machdep.c: hlt_cpus_mask |= hyperthreading_cpus_mask; amd64/amd64/mp_machdep.c: retval = mask & hlt_cpus_mask; amd64/amd64/mp_machdep.c: while (mask & hlt_cpus_mask) i386/i386/mp_machdep.c: mask = hlt_cpus_mask; i386/i386/mp_machdep.c: hlt_cpus_mask = mask; i386/i386/mp_machdep.c: hlt_cpus_mask |= logical_cpus_mask; i386/i386/mp_machdep.c: hlt_cpus_mask &= ~logical_cpus_mask; i386/i386/mp_machdep.c: hlt_cpus_mask |= hyperthreading_cpus_mask; i386/i386/mp_machdep.c: if ((hlt_cpus_mask & all_cpus) == all_cpus) i386/i386/mp_machdep.c: hlt_cpus_mask &= ~(1<<0); i386/i386/mp_machdep.c: hlt_cpus_mask &= ~hyperthreading_cpus_mask; i386/i386/mp_machdep.c: hlt_cpus_mask |= hyperthreading_cpus_mask; i386/i386/mp_machdep.c: (hlt_cpus_mask & logical_cpus_mask) == logical_cpus_mask) i386/i386/mp_machdep.c: if ((hlt_cpus_mask & all_cpus) == all_cpus) i386/i386/mp_machdep.c: hlt_cpus_mask &= ~(1<<0); i386/i386/mp_machdep.c: hlt_cpus_mask |= logical_cpus_mask; i386/i386/mp_machdep.c: hlt_cpus_mask |= hyperthreading_cpus_mask; i386/i386/mp_machdep.c: retval = mask & hlt_cpus_mask; i386/i386/mp_machdep.c: while (mask & hlt_cpus_mask) kern/subr_smp.c:cpumask_t hlt_cpus_mask; kern/sched_4bsd.c: dontuse = me | stopped_cpus | hlt_cpus_mask; kern/sched_4bsd.c: (idle_cpus_mask & ~(hlt_cpus_mask | me))) kern/kern_pmc.c: return ((hlt_cpus_mask & (1 << cpu)) != 0); sys/smp.h:extern cpumask_t hlt_cpus_mask; -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org