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

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Date:	Mon, 28 Dec 2009 09:34:56 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	balbir@...ux.vnet.ibm.com
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"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 08:28 +0530, Balbir Singh wrote:

> We can, but the data being on read-side is going to be out-of-date
> more than without the use of rcu_assign_pointer(). Do we need variants
> like to rcu_rb_next() to avoid overheads for everyone?

More or less doesn't matter! As long as you cannot get it atomic there's
holes and you need to deal with it.

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