From owner-freebsd-questions@FreeBSD.ORG  Mon Jun 16 11:35:28 2003
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 4DE3637B4A3
	for <freebsd-questions@freebsd.org>;
	Mon, 16 Jun 2003 11:35:28 -0700 (PDT)
Received: from rosebud.alerce.com (rosebud.lbl.gov [131.243.193.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 5BC7F43F93
	for <freebsd-questions@freebsd.org>;
	Mon, 16 Jun 2003 11:35:27 -0700 (PDT)
	(envelope-from hartzell@rosebud.alerce.com)
Received: from rosebud.alerce.com (localhost [127.0.0.1])
	by rosebud.alerce.com (8.12.8p1/8.12.8) with ESMTP id h5GIZQSv014090
	for <freebsd-questions@freebsd.org>;
	Mon, 16 Jun 2003 11:35:26 -0700 (PDT)
	(envelope-from hartzell@rosebud.alerce.com)
Received: (from hartzell@localhost)
	by rosebud.alerce.com (8.12.8p1/8.12.8/Submit) id h5GIZPWl014058;
	Mon, 16 Jun 2003 11:35:25 -0700 (PDT)
From: George Hartzell <hartzell@kestrel.alerce.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <16110.3565.71625.373384@rosebud.alerce.com>
Date: Mon, 16 Jun 2003 11:35:25 -0700
To: freebsd-questions@freebsd.org
X-Mailer: VM 7.14 under 21.4 (patch 12) "Portable Code" XEmacs Lucid
Subject: Using kevent to catch laptop disk I/O culprit?
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: George Hartzell <hartzell@kestrel.alerce.com>
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 16 Jun 2003 18:35:28 -0000


I'm working on keeping my laptop disk spun down and am using the
process of elimination to figure out who's always spinning up the
disk.

So far, I've put /tmp on an mfs, and I just installed Robert Sexton's
hw.ata.suspend patch from the freebsd-mobile archives.

I'm slowly killing off and/or fine tuning various daemons to see if
they're responsible for all of the IO, and it occured to me that
the kevent/kqueue stuff might be a great way to actually see who's
writing what, when.

Has anyone written the necessary parts to get this kind of a simple
filesystem trace?

g.