linux-kernel - Re: Containers: css

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Message-ID: <469DA57F.9050302@linux.vnet.ibm.com>
Date:	Wed, 18 Jul 2007 11:00:39 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	"Paul (??) Menage" <menage@...gle.com>
CC:	balbir@...ux.vnet.ibm.com, dhaval@...ux.vnet.ibm.com,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Pavel Emelianov <xemul@...ru>, Paul Jackson <pj@....com>,
	Linux Containers <containers@...ts.osdl.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Containers: css_put() dilemma

Balbir Singh wrote:
> Paul (??) Menage wrote:
>> On 7/17/07, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>>> without too much knowledge of each other. BTW, what are the semantics
>>> of css_put() is it expected to free the container/run the release agent
>>> when the reference count of the container_subsys_state drops to zero?
>>>
>> If you css_put() the last reference on a subsystem state object and
>> the associated container is marked as notify_on_release, then
>> check_for_release() is called which does a more full check of whether
>> the container is releasable. If it is, a workqueue task is scheduled
>> to run the userspace release agent, which can then do anything it
>> wants, including potentially deleting the empty container.
>>
> 
> Ok.. so my problem still remains, how do I get a non-blocking atomic
> reference increment/decrement routine, that would prevent my
> container from being deleted?
> 
> I don't find cpusets using css_put(). I was hoping that we could
> alter css_* would provide the functionality I need.
> 
> 

Thinking out loud again, can we add can_destory() callbacks?

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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