Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030340AbXBTSqA (ORCPT ); Tue, 20 Feb 2007 13:46:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030344AbXBTSqA (ORCPT ); Tue, 20 Feb 2007 13:46:00 -0500 Received: from netops-testserver-4-out.sgi.com ([192.48.171.29]:39746 "EHLO netops-testserver-4.corp.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1030340AbXBTSp7 (ORCPT ); Tue, 20 Feb 2007 13:45:59 -0500 Date: Tue, 20 Feb 2007 10:45:55 -0800 (PST) From: Christoph Lameter To: Max Krasnyansky cc: Oleg Nesterov , Ingo Molnar , Srivatsa Vaddagiri , "Pallipadi, Venkatesh" , Gautham shenoy , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: slab: start_cpu_timer/cache_reap CONFIG_HOTPLUG_CPU problems In-Reply-To: <45DB404C.4070305@qualcomm.com> Message-ID: References: <20070129011301.GA844@tv-sign.ru> <20070129171923.GA138@tv-sign.ru> <20070129182742.GA158@tv-sign.ru> <45DB404C.4070305@qualcomm.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1016 Lines: 24 On Tue, 20 Feb 2007, Max Krasnyansky wrote: > > > Well seems that we have a set of unresolved issues with workqueues and cpu > > > hotplug. > > How about storing 'cpu' explicitly in the work queue instead of relying on the > smp_processor_id() and friends ? That way there is no ambiguity when > threads/timers get > moved around. The slab functionality is designed to work on the processor with the queue. These tricks will only cause more trouble in the future. The cache_reaper needs to be either disabled or run on the right processor. It should never run on the wrong processor. The cache_reaper() is of no importance to hotplug. You just need to make sure that it is not in the way (disable it and if its running wait until the cache_reaper has finished). - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/