linux-kernel - Re: [PATCH -mmotm 1/5] memcg: disable irq at page cgroup lock

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

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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