linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Tejun Heo <tj@kernel.org>
To: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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: Wed, 7 Nov 2012 20:45:21 -0800	[thread overview]
Message-ID: <20121108044521.GH2660@mtj.dyndns.org> (raw)
In-Reply-To: <509B382E.4030707@jp.fujitsu.com>

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.

Thanks.

-- 
tejun

  reply	other threads:[~2012-11-08  4:45 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 [this message]
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20121108044521.GH2660@mtj.dyndns.org \
    --to=tj@kernel.org \
    --cc=cgroups@vger.kernel.org \
    --cc=containers@lists.linux-foundation.org \
    --cc=fweisbec@gmail.com \
    --cc=kamezawa.hiroyu@jp.fujitsu.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=lizefan@huawei.com \
    --cc=mhocko@suse.cz \
    --cc=rjw@sisk.pl \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).