From owner-cvs-src@FreeBSD.ORG  Fri Jun  6 19:11:24 2008
Return-Path: <owner-cvs-src@FreeBSD.ORG>
Delivered-To: cvs-src@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 00D70106564A;
	Fri,  6 Jun 2008 19:11:24 +0000 (UTC)
	(envelope-from phk@critter.freebsd.dk)
Received: from phk.freebsd.dk (phk.freebsd.dk [130.225.244.222])
	by mx1.freebsd.org (Postfix) with ESMTP id B5E6A8FC16;
	Fri,  6 Jun 2008 19:11:23 +0000 (UTC)
	(envelope-from phk@critter.freebsd.dk)
Received: from critter.freebsd.dk (unknown [192.168.64.3])
	by phk.freebsd.dk (Postfix) with ESMTP id 208DE170E5;
	Fri,  6 Jun 2008 19:11:22 +0000 (UTC)
Received: from critter.freebsd.dk (localhost [127.0.0.1])
	by critter.freebsd.dk (8.14.2/8.14.2) with ESMTP id m56JBL55001810;
	Fri, 6 Jun 2008 19:11:21 GMT (envelope-from phk@critter.freebsd.dk)
To: Alan Cox <alc@FreeBSD.org>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Fri, 06 Jun 2008 18:38:43 GMT."
	<200806061838.m56Icu2E074642@repoman.freebsd.org> 
Date: Fri, 06 Jun 2008 19:11:21 +0000
Message-ID: <1809.1212779481@critter.freebsd.dk>
Sender: phk@critter.freebsd.dk
Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/vm vm_page.c 
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 06 Jun 2008 19:11:24 -0000

In message <200806061838.m56Icu2E074642@repoman.freebsd.org>, Alan Cox writes:
>alc         2008-06-06 18:38:43 UTC
>
>  FreeBSD src repository
>
>  Modified files:
>    sys/vm               vm_page.c 
>  Log:
>  SVN rev 179623 on 2008-06-06 18:38:43Z by alc
>  
>  Essentially, neither madvise(..., MADV_DONTNEED) nor madvise(..., MADV_FREE)
>  work.  (Moreover, I don't believe that they have ever worked as intended.)

I remember they did have a measurable but minor impact on performance
in systems which paged a lot, back when they were introduced, sort
of 1995-ish.  But with the subsequent plunge in RAM prices they
never saw much use.

Thanks for fixing them.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.