linux-kernel - Re: [PATCH 2/7] containers (V7): Cpusets hooked into containers

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Message-ID: <20070307145257.GD32105@in.ibm.com>
Date:	Wed, 7 Mar 2007 20:22:57 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	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 2/7] containers (V7): Cpusets hooked into containers

On Mon, Feb 12, 2007 at 12:15:23AM -0800, menage@...gle.com wrote:
> -	mutex_lock(&callback_mutex);
> -	list_add(&cs->sibling, &cs->parent->children);
> +	cont->cpuset = cs;
> +	cs->container = cont;
>  	number_of_cpusets++;
> -	mutex_unlock(&callback_mutex);

What's the rule to read/write number_of_cpusets? The earlier cpuset code was
incrementing/decrementing under callback_mutex, but now we aren't. How safe is 
that? 

The earlier cpuset code also was reading number_of_cpusets w/o the
callback_mutex held (atleast in cpuset_zone_allowed_softwall). Is that safe?

-- 
Regards,
vatsa
-
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