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Subject: Re: [PATCH -mmotm 1/5] memcg: disable irq at page cgroup lock
From: Peter Zijlstra <peterz@infradead.org>
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Date: Fri, 23 Apr 2010 22:57:06 +0200
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To: Greg Thelen <gthelen@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>, Vivek Goyal <vgoyal@redhat.com>, balbir@linux.vnet.ibm.com, Andrea Righi <arighi@develer.com>, Trond Myklebust <trond.myklebust@fys.uio.no>, Suleiman Souhlal <suleiman@google.com>, "Kirill A. Shutemov" <kirill@shutemov.name>, Andrew Morton <akpm@linux-foundation.org>, containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
List-ID: <linux-mm.kvack.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?

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