From owner-cvs-sys  Fri Sep 27 20:42:40 1996
Return-Path: owner-cvs-sys
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id UAA02095
          for cvs-sys-outgoing; Fri, 27 Sep 1996 20:42:40 -0700 (PDT)
Received: from dyson.iquest.net (dyson.iquest.net [198.70.144.127])
          by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id UAA02014;
          Fri, 27 Sep 1996 20:42:33 -0700 (PDT)
Received: (from root@localhost) by dyson.iquest.net (8.7.5/8.6.9) id WAA03366; Fri, 27 Sep 1996 22:42:30 -0500 (EST)
From: "John S. Dyson" <toor@dyson.iquest.net>
Message-Id: <199609280342.WAA03366@dyson.iquest.net>
Subject: Re: cvs commit:  src/sys/vm vm_object.c vm_object.h vm_page.c vm_pageout.c
To: dyson@freefall.freebsd.org (John Dyson)
Date: Fri, 27 Sep 1996 22:42:30 -0500 (EST)
Cc: CVS-committers@freefall.freebsd.org, cvs-all@freefall.freebsd.org,
        cvs-sys@freefall.freebsd.org
In-Reply-To: <199609280333.UAA26434@freefall.freebsd.org> from "John Dyson" at Sep 27, 96 08:33:53 pm
Reply-To: dyson@freebsd.org
X-Mailer: ELM [version 2.4 PL24 ME8]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-cvs-sys@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

> 
> dyson       96/09/27 20:33:51
> 
>   Modified:    sys/vm    vm_object.c vm_object.h vm_page.c vm_pageout.c
>   Log:
>   
>   
>   Revision  Changes    Path
>   1.82      +3 -2      src/sys/vm/vm_object.c
>   1.31      +2 -1      src/sys/vm/vm_object.h
>   1.65      +103 -78   src/sys/vm/vm_page.c
>   1.86      +3 -3      src/sys/vm/vm_pageout.c
> 
> 
Missing commit mail:

Fix some redundancy in the page coloring code.  Also, support
contiguous allocation of memory in objects (if the system doesn't
have to do anything special), if all else is equal.

Note on page coloring design:
	Our page coloring is a little more sophisticated than the
	simple schemes put forth in some technical papers.  Firstly,
	the buckets for the base page in an object are hashed based
	upon an offset that is incremented by a prime number for every
	object.  Additionally, instead of just punting on a non-existant
	page for a desired color (either choosing a random color, or
	denying the request for the page), we pick the "next best" color
	for a given page.  This allows for a soft degradation.  We also choose
	a physically contiguous page if it is convienient.

	It is likely to be advantageous to choose a special range of colors
	for shared libs, but I haven't come up with a reasonable partitioning
	of colors yet.

John