From owner-cvs-src@FreeBSD.ORG Thu Sep 28 17:26:30 2006 Return-Path: X-Original-To: cvs-src@FreeBSD.org Delivered-To: cvs-src@FreeBSD.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E4E7F16A407; Thu, 28 Sep 2006 17:26:30 +0000 (UTC) (envelope-from sobomax@FreeBSD.org) Received: from sippysoft.com (gk.360sip.com [72.236.70.226]) by mx1.FreeBSD.org (Postfix) with ESMTP id 001C343D69; Thu, 28 Sep 2006 17:26:19 +0000 (GMT) (envelope-from sobomax@FreeBSD.org) Received: from [192.168.1.47] ([204.244.149.125]) (authenticated bits=0) by sippysoft.com (8.13.8/8.13.6) with ESMTP id k8SHQETB018399 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 28 Sep 2006 10:26:16 -0700 (PDT) (envelope-from sobomax@FreeBSD.org) Message-ID: <451C05A4.3010605@FreeBSD.org> Date: Thu, 28 Sep 2006 10:25:56 -0700 From: Maxim Sobolev Organization: Sippy Software, Inc. User-Agent: Thunderbird 1.5.0.7 (Windows/20060909) MIME-Version: 1.0 To: Robert Watson References: <200609261608.k8QG8TYB044266@repoman.freebsd.org> <200609271117.25831.jhb@freebsd.org> <451A9E1E.30601@samsco.org> <200609271338.22284.jhb@freebsd.org> <20060927230635.D73166@fledge.watson.org> In-Reply-To: <20060927230635.D73166@fledge.watson.org> Content-Type: text/plain; charset=KOI8-U; format=flowed Content-Transfer-Encoding: 7bit Cc: cvs-src@FreeBSD.org, Scott Long , src-committers@FreeBSD.org, cvs-all@FreeBSD.org, John Baldwin Subject: Re: cvs commit: src/sys/i386/i386 local_apic.c X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Sep 2006 17:26:31 -0000 Robert Watson wrote: > It's pretty clear that if we're going to take the hypervisor + dynamic > reconfiguration thing seriously, we need a structured notion of adding > and removing CPUs from the active CPU pool, including things like event > handlers so that subsystems can shut down operations on the CPU. For > example, UMA needs a chance to drain per-CPU caches of various zones, > services that have pinned threads on the CPU will need to decide how to > deal with that, etc. It's work I'd very much like to see happen, and > until it's done we basically need to make sure that CPUs either exist > from boot and never cease existing, or don't exist at boot and are never > used. I can't agree more. The whole hlt_cpus_mask change leaves taste of the very bad hack. -Maxim