linux-kernel - Re: Populating multiple ptes at fault time

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Message-Id: <20080920191928.50ED.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Fri, 19 Sep 2008 07:21:34 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Chris Snook <csnook@...hat.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Hugh Dickens <hugh@...itas.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...ranet.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	"Martin J. Bligh" <mbligh@...gle.com>
Subject: Re: Populating multiple ptes at fault time

> Jeremy Fitzhardinge wrote:
> > Thanks, that was exactly what I was hoping to see.  I didn't see any
> > definitive statements against the patch set, other than a concern that
> > it could make things worse.  Was the upshot that no consensus was
> > reached about how to detect when its beneficial to preallocate anonymous
> > pages?
> 
> There were multiple discussions on the subject. The consensus was that it was
> difficult to generalize this and it would only work on special loads. Plus it
> would add some overhead to the general case.

but at that time, x86_64 large server doesn't exist yet.
I think mesurement again is valuable because typical server environment
is changed in these days.



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