From: Li Zefan <lizefan@huawei.com>
To: Tejun Heo <tj@kernel.org>
Cc: <mhocko@suse.cz>, <rjw@sisk.pl>,
<containers@lists.linux-foundation.org>,
<cgroups@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-pm@vger.kernel.org>, <fweisbec@gmail.com>
Subject: Re: [PATCH 3/9 v2] cgroup: implement generic child / descendant walk macros
Date: Fri, 9 Nov 2012 17:13:01 +0800 [thread overview]
Message-ID: <509CC91D.4050207@huawei.com> (raw)
In-Reply-To: <20121108175946.GA9672@htj.dyndns.org>
On 2012/11/9 1:59, Tejun Heo wrote:
> Currently, cgroup doesn't provide any generic helper for walking a
> given cgroup's children or descendants. This patch adds the following
> three macros.
>
> * cgroup_for_each_child() - walk immediate children of a cgroup.
>
> * cgroup_for_each_descendant_pre() - visit all descendants of a cgroup
> in pre-order tree traversal.
>
> * cgroup_for_each_descendant_post() - visit all descendants of a
> cgroup in post-order tree traversal.
>
> All three only require the user to hold RCU read lock during
> traversal. Verifying that each iterated cgroup is online is the
> responsibility of the user. When used with proper synchronization,
> cgroup_for_each_descendant_pre() can be used to propagate state
> updates to descendants in reliable way. See comments for details.
>
> v2: s/config/state/ in commit message and comments per Michal. More
> documentation on synchronization rules.
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujisu.com>
> Reviewed-by: Michal Hocko <mhocko@suse.cz>
I don't see anything wrong with the comment on cgroup_next_descendant_pre().
Acked-by: Li Zefan <lizefan@huawei.com>
next prev parent reply other threads:[~2012-11-09 9:13 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-03 8:38 [PATCHSET cgroup/for-3.8] cgroup_freezer: implement proper hierarchy support Tejun Heo
2012-11-03 8:38 ` [PATCH 1/9] cgroup: add cgroup_subsys->post_create() Tejun Heo
2012-11-05 13:42 ` Glauber Costa
2012-11-05 18:02 ` [RFC] cgroup: deprecate clone_children Tejun Heo
2012-11-05 19:17 ` Serge Hallyn
2012-11-05 19:26 ` Tejun Heo
2012-11-07 15:25 ` [PATCH 1/9] cgroup: add cgroup_subsys->post_create() Michal Hocko
2012-11-07 17:02 ` Tejun Heo
2012-11-07 17:15 ` [PATCH 1/9 v2] " Tejun Heo
2012-11-07 17:40 ` Michal Hocko
2012-11-08 2:59 ` Kamezawa Hiroyuki
2012-11-08 19:07 ` [PATCH 1/9 v3] " Tejun Heo
2012-11-09 9:09 ` Li Zefan
2012-11-09 9:09 ` Li Zefan
2012-11-09 11:09 ` Daniel Wagner
2012-11-09 17:22 ` Tejun Heo
2012-11-10 1:35 ` Glauber Costa
2012-11-12 13:04 ` Daniel Wagner
2012-11-03 8:38 ` [PATCH 2/9] cgroup: Use rculist ops for cgroup->children Tejun Heo
2012-11-07 15:30 ` Michal Hocko
2012-11-08 3:01 ` Kamezawa Hiroyuki
2012-11-09 9:10 ` Li Zefan
2012-11-03 8:38 ` [PATCH 3/9] cgroup: implement generic child / descendant walk macros Tejun Heo
2012-11-06 20:31 ` Tejun Heo
2012-11-07 15:38 ` Michal Hocko
2012-11-07 16:54 ` Michal Hocko
2012-11-07 17:01 ` Tejun Heo
2012-11-07 17:49 ` Michal Hocko
2012-11-08 3:21 ` Kamezawa Hiroyuki
2012-11-08 9:50 ` Michal Hocko
2012-11-08 17:15 ` Tejun Heo
2012-11-08 17:59 ` [PATCH 3/9 v2] " Tejun Heo
2012-11-09 9:13 ` Li Zefan [this message]
2012-11-03 8:38 ` [PATCH 4/9] cgroup_freezer: trivial cleanups Tejun Heo
2012-11-08 3:24 ` Kamezawa Hiroyuki
2012-11-08 9:53 ` Michal Hocko
2012-11-03 8:38 ` [PATCH 5/9] cgroup_freezer: prepare freezer_change_state() for full hierarchy support Tejun Heo
2012-11-08 4:25 ` Kamezawa Hiroyuki
2012-11-08 9:56 ` Michal Hocko
2012-11-03 8:38 ` [PATCH 6/9] cgroup_freezer: make freezer->state mask of flags Tejun Heo
2012-11-08 4:37 ` Kamezawa Hiroyuki
2012-11-08 4:42 ` Tejun Heo
2012-11-08 5:00 ` Kamezawa Hiroyuki
2012-11-08 14:38 ` Tejun Heo
2012-11-08 10:39 ` Michal Hocko
2012-11-08 14:39 ` Tejun Heo
2012-11-08 14:47 ` Michal Hocko
2012-11-03 8:38 ` [PATCH 7/9] cgroup_freezer: introduce CGROUP_FREEZING_[SELF|PARENT] Tejun Heo
2012-11-08 4:42 ` Kamezawa Hiroyuki
2012-11-08 4:45 ` Tejun Heo
2012-11-08 4:56 ` Kamezawa Hiroyuki
2012-11-08 14:41 ` Tejun Heo
2012-11-08 12:47 ` Michal Hocko
2012-11-08 14:42 ` Tejun Heo
2012-11-03 8:38 ` [PATCH 8/9] cgroup_freezer: add ->post_create() and ->pre_destroy() and track online state Tejun Heo
2012-11-08 4:48 ` Kamezawa Hiroyuki
2012-11-08 15:41 ` Tejun Heo
2012-11-08 13:23 ` Michal Hocko
2012-11-08 17:17 ` Tejun Heo
2012-11-03 8:38 ` [PATCH 9/9] cgroup_freezer: implement proper hierarchy support Tejun Heo
2012-11-07 11:00 ` Michal Hocko
2012-11-07 16:31 ` Tejun Heo
2012-11-07 16:39 ` [PATCH 9/9 v2] " Tejun Heo
2012-11-08 14:08 ` Michal Hocko
2012-11-08 14:18 ` Tejun Heo
2012-11-08 15:20 ` Michal Hocko
2012-11-08 15:29 ` Tejun Heo
2012-11-08 15:57 ` Michal Hocko
2012-11-08 17:57 ` [PATCH 9/9 v3] " Tejun Heo
2012-11-08 18:02 ` Michal Hocko
2012-11-08 18:04 ` Tejun Heo
2012-11-08 18:08 ` Michal Hocko
2012-11-08 18:01 ` [PATCHSET cgroup/for-3.8] " Tejun Heo
2012-11-09 17:15 ` Tejun Heo
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