linux-kernel - Re: [RFC PATCH] asynchronous page fault.

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Message-ID: <1261989047.7135.3.camel@laptop>
Date:	Mon, 28 Dec 2009 09:30:47 +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 idea is to let the RCU lock span whatever length you need the vma
> > for, the easy way is to simply use PREEMPT_RCU=y for now, 
> 
> I tried to remove his kind of reference count trick but I can't do that
> without synchronize_rcu() somewhere in unmap code. I don't like that and
> use this refcnt. 

Why, because otherwise we can access page tables for an already unmapped
vma? Yeah that is the interesting bit ;-)



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