Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030678AbWKOQhx (ORCPT ); Wed, 15 Nov 2006 11:37:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030680AbWKOQhx (ORCPT ); Wed, 15 Nov 2006 11:37:53 -0500 Received: from ausmtp04.au.ibm.com ([202.81.18.152]:31674 "EHLO ausmtp04.au.ibm.com") by vger.kernel.org with ESMTP id S1030678AbWKOQhw (ORCPT ); Wed, 15 Nov 2006 11:37:52 -0500 Message-ID: <455B4245.8000309@in.ibm.com> Date: Wed, 15 Nov 2006 22:07:25 +0530 From: Balbir Singh Reply-To: balbir@in.ibm.com Organization: IBM User-Agent: Thunderbird 1.5.0.7 (X11/20060922) MIME-Version: 1.0 To: "Patrick.Le-Dot" CC: dev@openvz.org, ckrm-tech@lists.sourceforge.net, haveblue@us.ibm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, rohitseth@google.com Subject: Re: [ckrm-tech] [RFC][PATCH 5/8] RSS controller task migration support References: <20061115115937.B0A851B6A2@openx4.frec.bull.fr> In-Reply-To: <20061115115937.B0A851B6A2@openx4.frec.bull.fr> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1913 Lines: 70 Patrick.Le-Dot wrote: > Hi Balbir, > > The get_task_mm()/mmput(mm) usage is not correct. > With CONFIG_DEBUG_SPINLOCK_SLEEP=y : > > BUG: sleeping function called from invalid context at kernel/fork.c:390 > in_atomic():1, irqs_disabled():0 > [] __might_sleep+0x97/0x9c > [] mmput+0x15/0x8b > [] install_arg_page+0x72/0xa9 > [] setup_arg_pages+0x184/0x1a5 > ... > > BUG: sleeping function called from invalid context at kernel/fork.c:390 > in_atomic():1, irqs_disabled():0 > [] __might_sleep+0x97/0x9c > [] mmput+0x15/0x8b > [] do_no_page+0x255/0x2bd > [] __handle_mm_fault+0xed/0x1ef > [] do_page_fault+0x247/0x506 > [] do_page_fault+0x0/0x506 > [] error_code+0x39/0x40 > > > current->mm seems to be enough here. Excellent, thanks for catching this! > > > > In patch4, memctlr_dec_rss(page, mm) should be memctlr_dec_rss(page) > to compile correctly. > > and in patch0 : >> 4. Disable cpuset's (to simply assignment of tasks to resource groups) >> cd /container >> echo 0 > cpuset_enabled > > should be : > echo 0 > cpuacct_enabled > > Note : cpuacct_enabled is 0 by default. > Thanks for pointing this out. > > Now the big question : to implement guarantee, the LRU needs to know > if a page can be removed from memory or not. > Any ideas to do that without any change in the struct page ? > For implementing guarantees, we can use limits. Please see http://wiki.openvz.org/Containers/Guarantees_for_resources. Thanks for the feedback! -- Balbir Singh, Linux Technology Center, IBM Software Labs - 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/