From owner-freebsd-hackers@FreeBSD.ORG  Sun Mar 20 08:33:30 2011
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id C9472106564A
	for <freebsd-hackers@freebsd.org>; Sun, 20 Mar 2011 08:33:30 +0000 (UTC)
	(envelope-from alan.l.cox@gmail.com)
Received: from mail-fx0-f54.google.com (mail-fx0-f54.google.com
	[209.85.161.54])
	by mx1.freebsd.org (Postfix) with ESMTP id 214A58FC08
	for <freebsd-hackers@freebsd.org>; Sun, 20 Mar 2011 08:33:29 +0000 (UTC)
Received: by fxm11 with SMTP id 11so5569968fxm.13
	for <freebsd-hackers@freebsd.org>; Sun, 20 Mar 2011 01:33:29 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=domainkey-signature:mime-version:reply-to:in-reply-to:references
	:date:message-id:subject:from:to:cc:content-type;
	bh=K8lRCZVqz0SmlOlDWXuhv/ArxtPg/wOHywDPG1bCS+A=;
	b=mk5oMPTtMwklP6PzTdbe5fDnyRMs6yLpfMZhWBdsiMTTgecpv1pkWHkaRewBVpvzYl
	SzcQ43yhkj368JX0WEs2iGTSerYfBk8pP+fyKI0+R4R645h/51B4QKvQ0GAvpk6PFUQE
	qlbz4vo9W8GlDzeX2xx4a+jgFkrWF8lNTFIRg=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;
	h=mime-version:reply-to:in-reply-to:references:date:message-id
	:subject:from:to:cc:content-type;
	b=DudGaVW0Cma6LgTNzRb0H5rnmGYicfQDWpDwqjZy5ma5x+DUCGpt86PP8yOd5CfaYt
	dsuYC00MD5tTXXVBFYjTc47dXE8di3Ptp9tnzl1mcj0yYZY4jza9AAcMMdvzCrQ5/7ib
	3CZzjKxJN/fLdh41PEnYKydtB4QUpAexnH8cw=
MIME-Version: 1.0
Received: by 10.223.127.213 with SMTP id h21mr1711349fas.139.1300608179691;
	Sun, 20 Mar 2011 01:02:59 -0700 (PDT)
Received: by 10.223.115.148 with HTTP; Sun, 20 Mar 2011 01:02:59 -0700 (PDT)
In-Reply-To: <AANLkTikdiBPRJB_Qs11h_vxsnx+XOTfAHeg14UGMOzGO@mail.gmail.com>
References: <AANLkTikdiBPRJB_Qs11h_vxsnx+XOTfAHeg14UGMOzGO@mail.gmail.com>
Date: Sun, 20 Mar 2011 03:02:59 -0500
Message-ID: <AANLkTikv+t1bLDq83gN6ifFn0GX2MoSPfr1KLd68mBQN@mail.gmail.com>
From: Alan Cox <alan.l.cox@gmail.com>
To: J L <dimitar9909@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
X-Content-Filtered-By: Mailman/MimeDel 2.1.5
Cc: freebsd-hackers@freebsd.org
Subject: Re: Question about Reverse Mappings in FreeBSD.
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: alc@freebsd.org
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 20 Mar 2011 08:33:30 -0000

On Fri, Mar 18, 2011 at 7:30 PM, J L <dimitar9909@gmail.com> wrote:

> I read an article about Reverse Mappings technique in memory management
> part. It improves a lot from Linux 2.4 to 2.6. I am wondering is FreeBSD
> also have this feature? Which source files should I go to find these? I
> want
> to do some study on this.
> Wish someone can enlighten me. Thank you.
>


Reverse mappings are implemented by the machine-dependent layer of the
virtual memory system, which is called the "pmap".  Look for files named
pmap.c in the source tree, such as sys/amd64/amd64/pmap.c.  In particular,
look for the code that manages pv entries.

Alan