From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753472AbZHTCjh (ORCPT ); Wed, 19 Aug 2009 22:39:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753123AbZHTCjg (ORCPT ); Wed, 19 Aug 2009 22:39:36 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:60127 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752846AbZHTCjg (ORCPT ); Wed, 19 Aug 2009 22:39:36 -0400 Message-ID: <4A8CB717.7000804@cn.fujitsu.com> Date: Thu, 20 Aug 2009 10:38:15 +0800 From: Li Zefan User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Thunderbird/3.0b2 MIME-Version: 1.0 To: Paul Menage CC: akpm@linux-foundation.org, bblum@andrew.cmu.edu, linux-kernel@vger.kernel.org, containers@lists.linux-foundation.org Subject: Re: [PATCH 5/8] Changes css_set freeing mechanism to be under RCU References: <20090818235059.22531.42618.stgit@menage.mtv.corp.google.com> <20090818235832.22531.96610.stgit@menage.mtv.corp.google.com> In-Reply-To: <20090818235832.22531.96610.stgit@menage.mtv.corp.google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 07:58, Paul Menage wrote: > From: Ben Blum > > > Changes css_set freeing mechanism to be under RCU > > This is a prepatch for making the procs file writable. In order to free the > old css_sets for each task to be moved as they're being moved, the freeing > mechanism must be RCU-protected, or else we would have to have a call to > synchronize_rcu() for each task before freeing its old css_set. > > Signed-off-by: Ben Blum > Signed-off-by: Paul Menage > Acked-by: Li Zefan