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Date:	Tue, 23 Nov 2010 18:29:32 -0800
From:	Colin Cross <ccross@...roid.com>
To:	Paul Menage <menage@...gle.com>
Cc:	Colin Cross <ccross@...roid.com>, Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup: Remove call to synchronize_rcu in cgroup_attach_task

On Tue, Nov 23, 2010 at 5:43 PM, Colin Cross <ccross@...roid.com> wrote:
> This patch is similar to what you described.  The main differences are
> that I used a new atomic to handle the rmdir case, and I converted
> check_for_release to be callable in softirq context rather than schedule
> work in free_css_set_rcu.  Your css_set scanning in rmdir sounds better,
> I'll take another look at that.  Is there any problem with disabling irqs
> with spin_lock_irqsave in check_for_release?

free_css_set_rcu needs to take a write lock on css_set_lock to protect the
list_del(&link->cgrp_link_list).  I'll convert it to schedule work, and change
the spin_lock_irqsave back to spin_lock.
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