From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752804AbXCEQ4Q (ORCPT ); Mon, 5 Mar 2007 11:56:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752806AbXCEQ4Q (ORCPT ); Mon, 5 Mar 2007 11:56:16 -0500 Received: from e6.ny.us.ibm.com ([32.97.182.146]:59224 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752805AbXCEQ4O (ORCPT ); Mon, 5 Mar 2007 11:56:14 -0500 Date: Mon, 5 Mar 2007 22:32:44 +0530 From: Srivatsa Vaddagiri To: Paul Jackson Cc: menage@google.com, ebiederm@xmission.com, sam@vilain.net, akpm@linux-foundation.org, dev@sw.ru, xemul@sw.ru, serue@us.ibm.com, containers@lists.osdl.org, winget@google.com, ckrm-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/2] resource control file system - aka containers on top of nsproxy! Message-ID: <20070305170244.GA17151@in.ibm.com> Reply-To: vatsa@in.ibm.com References: <20070301133543.GK15509@in.ibm.com> <20070301113900.a7dace47.pj@sgi.com> <20070303093655.GA1028@in.ibm.com> <20070303022100.8cee6997.pj@sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070303022100.8cee6997.pj@sgi.com> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Mar 03, 2007 at 02:21:00AM -0800, Paul Jackson wrote: > Perhaps you could summarize what becomes of this hook, in this > brave new world of rcfs ... attach_task() still uses a synchronize_rcu before doing a put_nsproxy in the rcfs patches. This means cpuset_update_task_memory_state() can read a task's cpuset->mems_generation under just a rcu_read_lock() (as it is doing currently). void cpuset_update_task_memory_state(void) { tsk = current; ... } else { rcu_read_lock(); ns = rcu_dereference(tsk->nsproxy); my_cpusets_mem_gen = ns->ctlr_data[cpuset_ctlr.subsys_id]->mems_generation; rcu_read_unlock(); } ... } -- Regards, vatsa