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Date:	Mon, 28 Dec 2009 12:43:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>,
	cl@...ux-foundation.org
Subject: Re: [RFC PATCH] asynchronous page fault.

On Mon, 2009-12-28 at 09:36 +0900, KAMEZAWA Hiroyuki wrote:
> > the hard way
> > is to also incorporate the drop-mmap_sem on blocking patches from a
> > while ago.
> > 
> "drop-mmap_sem if block" is no help for this false-sharing problem.

No but it does help with the problem of RCU-read-lock not being able to
sleep.

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