linux-kernel - Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code

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Message-ID: <20070213054857.GD22982@in.ibm.com>
Date:	Tue, 13 Feb 2007 11:18:57 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	"Paul Menage" <menage@...gle.com>
Cc:	akpm@...l.org, pj@....com, sekharan@...ibm.com, dev@...ru,
	xemul@...ru, serue@...ibm.com, ebiederm@...ssion.com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	rohitseth@...gle.com, mbligh@...gle.com, winget@...gle.com,
	containers@...ts.osdl.org, devel@...nvz.org
Subject: Re: [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code

On Mon, Feb 12, 2007 at 11:46:20AM -0800, Paul Menage wrote:
> On further reflection, this probably would be safe after all. Since we
> don't call put_container_group() in attach_task() until after
> synchronize_rcu() completes, that implies that a container_group_get()
> from the RCU section would have already completed. So we should be
> fine.

Right.

Which make me wonder why we need task_lock() at all ..I can understand
the need for a lock like that if we are reading/updating multiple words
in task_struct under the lock. In this case, it is used to read/write
just one pointer, isnt it? I think it can be eliminated all-together
with the use of RCU.


-- 
Regards,
vatsa
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