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

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Date:	Mon, 28 Dec 2009 12:06:01 +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 19:57 +0900, KAMEZAWA Hiroyuki wrote:
>   - because pmd has some trobles because of quicklists..I don't wanted to
>     touch free routine of them. 

I really doubt the value of that quicklist horror. IIRC x86 stopped
supporting that a while ago as well.

I would suspect the page-table retention scheme possible with RCU freed
page tables could be far more efficient than quicklists, but then that's
all speculation since I don't know what kind of workloads we're talking
about and this glaring lack of implementation to compare.

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