linux-kernel - Re: [PATCH 2/2] cgroup: Walk task list under tasklist_lock in cgroup_enable_task_cg

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Message-ID: <20120222010623.GJ12236@google.com>
Date:	Tue, 21 Feb 2012 17:06:23 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Mandeep Singh Baines <msb@...omium.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/2] cgroup: Walk task list under tasklist_lock in
 cgroup_enable_task_cg_list

On Wed, Feb 22, 2012 at 02:04:34AM +0100, Frederic Weisbecker wrote:
> > Guys, this is one time thing.  It happens *once* after boot and we're
> > already holding exclusive lock.  There's no reason to optimize this at
> > all.  Let's just keep it simple.
> 
> For now I agree. But one day the real time guys might eye that thing.

If the latency issue ever comes up, I think the right thing to do is
just disable the lazy optimization.  ie. Just chain tasks from the
beginning.

Thanks.

-- 
tejun
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