linux-kernel - Re: [PATCH 7/9] cgroup_freezer: introduce CGROUP_FREEZING

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Date:	Thu, 08 Nov 2012 13:56:52 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	lizefan@...wei.com, mhocko@...e.cz, rjw@...k.pl,
	linux-pm@...r.kernel.org, fweisbec@...il.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH 7/9] cgroup_freezer: introduce CGROUP_FREEZING_[SELF|PARENT]

(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@...nel.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@...fujitsu.com>

Thanks,
-Kame





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