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

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Message-ID: <20070213081625.GA4252@in.ibm.com>
Date:	Tue, 13 Feb 2007 13:46:25 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	"Paul Menage" <menage@...gle.com>
Cc:	sekharan@...ibm.com, ckrm-tech@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, xemul@...ru, dev@...ru,
	containers@...ts.osdl.org, pj@....com, ebiederm@...ssion.com,
	mbligh@...gle.com, winget@...gle.com, rohitseth@...gle.com,
	serue@...ibm.com, devel@...nvz.org
Subject: Re: [ckrm-tech] [PATCH 1/7] containers (V7): Generic container system abstracted from cpusets code

On Tue, Feb 13, 2007 at 11:18:57AM +0530, Srivatsa Vaddagiri wrote:
> 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.

I see that cpuset.c uses task_lock to read/write multiple words
(cpuset_update_task_memory_state) ..So yes it is necessary in attach_task() ..


-- 
Regards,
vatsa
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