From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267746AbUIAD5u (ORCPT ); Tue, 31 Aug 2004 23:57:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268995AbUIAD5u (ORCPT ); Tue, 31 Aug 2004 23:57:50 -0400 Received: from bi01p1.co.us.ibm.com ([32.97.110.142]:30833 "EHLO linux.local") by vger.kernel.org with ESMTP id S267746AbUIAD5t (ORCPT ); Tue, 31 Aug 2004 23:57:49 -0400 Date: Tue, 31 Aug 2004 20:53:50 -0700 From: "Paul E. McKenney" To: Jim Houston Cc: linux-kernel@vger.kernel.org, Dipankar Sarma , Manfred Spraul , Andrew Morton , William Lee Irwin III , Jack Steiner , Jesse Barnes , rusty@rustcorp.com.au Subject: Re: [RFC&PATCH] Alternative RCU implementation Message-ID: <20040901035350.GH1241@us.ibm.com> Reply-To: paulmck@us.ibm.com References: <20040830004322.GA2060@us.ibm.com> <1093886020.984.238.camel@new.localdomain> <20040830185223.GF1243@us.ibm.com> <1093922569.1003.159.camel@new.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1093922569.1003.159.camel@new.localdomain> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 30, 2004 at 11:22:49PM -0400, Jim Houston wrote: > On Mon, 2004-08-30 at 14:52, Paul E. McKenney wrote: > > How does the rest of the kernel work with all interrupts to > > a particular CPU shut off? For example, how do you timeslice? > > It's a balancing act. In some cases we just document the > missing functionality. If the local timer is disabled on a cpu, > all processes are SCHED_FIFO. In the case of Posix timers, we > move timers to honor the procesor shielding an the process affinity. I have to ask... When you say that you move the timers, you mean that non-realtime CPU 1 managers timers for realtime CPU 0, so that CPU 1 is (effectively) taking CPU 0's timer interrupts? Thanx, Paul