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

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Message-ID: <20080917142805.41e2b07e@bree.surriel.com>
Date:	Wed, 17 Sep 2008 14:28:05 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	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>
Subject: Re: Populating multiple ptes at fault time

On Wed, 17 Sep 2008 10:47:30 -0700
Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Minor faults are easier; if the page already exists in memory, we should
> just create mappings to it.  If neighbouring pages are also already
> present, then we can can cheaply create mappings for them too.

This is especially true for mmaped files, where we do not have to
allocate anything to create the mapping.

Populating multiple PTEs at a time is questionable for anonymous
memory, where we'd have to allocate extra pages.

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