From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: [PATCH -mmotm 1/5] memcg: disable irq at page cgroup lock
Date: Fri, 23 Apr 2010 22:57:06 +0200
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To: Greg Thelen <gthelen-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Cc: Andrea Righi <arighi-vWjgImWzx8FBDgjK7y7TUQ@public.gmane.org>, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Daisuke Nishimura <nishimura-YQH0OdQVrdy45+QrQBaojngSJqDPrsil@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Trond Myklebust <trond.myklebust-41N18TsMXrtuMpJDpNschA@public.gmane.org>, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, Suleiman Souhlal <suleiman-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Vivek Goyal <vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, balbir-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org
List-Id: containers.vger.kernel.org

On Fri, 2010-04-23 at 13:17 -0700, Greg Thelen wrote:
> +static void mem_cgroup_begin_page_cgroup_reassignment(void)
> +{
> +       VM_BUG_ON(mem_cgroup_account_move_ongoing);
> +       mem_cgroup_account_move_ongoing = true;
> +       synchronize_rcu();
> +} 

btw, you know synchronize_rcu() is _really_ slow?