Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751638Ab0LOJeo (ORCPT ); Wed, 15 Dec 2010 04:34:44 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:62619 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751113Ab0LOJem (ORCPT ); Wed, 15 Dec 2010 04:34:42 -0500 Message-ID: <4D088BB5.30903@cn.fujitsu.com> Date: Wed, 15 Dec 2010 17:34:45 +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: Andrew Morton CC: Paul Menage , Peter Zijlstra , Hiroyuki KAMEZAWA , Matt Helsley , Stephane Eranian , LKML , containers@lists.linux-foundation.org Subject: [PATCH v2 0/6] cgroups: Bindable cgroup subsystems X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2010-12-15 17:34:38, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2010-12-15 17:34:39, Serialize complete at 2010-12-15 17:34:39 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2074 Lines: 57 Stephane posted a patchset to add perf_cgroup subsystem, so perf can be used to monitor all threads belonging to a cgroup. But if you already mounted a cgroup hierarchy but without perf_cgroup and the hierarchy has sub-cgroups, you can't bind perf_cgroup to it, and thus you're not able to use per-cgroup perf feature. This patchset alleviates the pain, and then a subsytem can be bound/unbound to/from a hierarchy which has sub-cgroups in it. Some subsystems still can't take advantage of this patchset, memcgroup and cpuset for example. For cpuset, if a hierarchy has a sub-cgroup and the cgroup has tasks, we can't decide sub-cgroup's cpuset.mems and cpuset.cpus automatically if we try to bind cpuset to this hierarchy. For memcgroup, memcgroup uses css_get/put(), and due to some complexity, for now bindable subsystems should not use css_get/put(). Usage: # mount -t cgroup -o cpuset xxx /mnt # mkdir /mnt/tmp # echo $$ > /mnt/tmp/tasks (add cpuacct to the hierarchy) # mount -o remount,cpuset,cpuacct xxx /mnt (remove it from the hierarchy) # mount -o remount,cpuset xxx /mnt There's another limitation, cpuacct should not be bound to any mounted hierarchy before the above operation. But that's not a problem, as you can remove it from a hierarchy and bind it to another one. Changelog v2: - Fix some bugs. - Spit can_bind flag to bindable and unbindable flags - Provide a __css_tryget() so a bindable subsystem can pin a cgroup via it. - ... --- Documentation/cgroups/cgroups.txt | 37 +++- include/linux/cgroup.h | 39 +++- kernel/cgroup.c | 391 +++++++++++++++++++++++++++++++------ kernel/cgroup_freezer.c | 1 + kernel/sched.c | 2 + security/device_cgroup.c | 2 + 6 files changed, 398 insertions(+), 74 deletions(-) -- 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/