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From: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Tejun Heo <tj@kernel.org>
Cc: lizefan@huawei.com, mhocko@suse.cz, rjw@sisk.pl,
	linux-pm@vger.kernel.org, fweisbec@gmail.com,
	containers@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org, cgroups@vger.kernel.org
Subject: Re: [PATCH 7/9] cgroup_freezer: introduce CGROUP_FREEZING_[SELF|PARENT]
Date: Thu, 08 Nov 2012 13:56:52 +0900	[thread overview]
Message-ID: <509B3B94.1070407@jp.fujitsu.com> (raw)
In-Reply-To: <20121108044521.GH2660@mtj.dyndns.org>

(2012/11/08 13:45), Tejun Heo wrote:
> Hello,
>
> On Thu, Nov 08, 2012 at 01:42:22PM +0900, Kamezawa Hiroyuki wrote:
>> (2012/11/03 17:38), Tejun Heo wrote:
>>> Introduce FREEZING_SELF and FREEZING_PARENT and make FREEZING OR of
>>> the two flags.  This is to prepare for full hierarchy support.
>>>
>>> freezer_apply_date() is updated such that it can handle setting and
>>> clearing of both flags.  The two flags are also exposed to userland
>>> via read-only files self_freezing and parent_freezing.
>>>
>>> Other than the added cgroupfs files, this patch doesn't introduce any
>>> behavior change.
>>>
>>> Signed-off-by: Tejun Heo <tj@kernel.org>
>>
>> What is the purpose of FREEZING_SELG/PARENT, having 2 flags and
>> make it visible to users ?
>
> SELF is the configuration of the current cgroup, PARENT is freezing
> state inherited from an ancestor.  If either is set, the cgroup is
> freezing.  Without the two conditions visible to userland, it can get
> a bit confusing as echoing "THAWED" to state may not do anything to
> the cgroup.
>
Got it, thank you. I'm glad if you add some more explanation in comments
and considered use-case in changelog.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Thanks,
-Kame






  reply	other threads:[~2012-11-08  4:57 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
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 [this message]
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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