From owner-freebsd-hackers@FreeBSD.ORG  Thu Nov 23 09:19:45 2006
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
X-Original-To: freebsd-hackers@freebsd.org
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 9937716A40F
	for <freebsd-hackers@freebsd.org>; Thu, 23 Nov 2006 09:19:45 +0000 (UTC)
	(envelope-from freebsd-hackers@m.gmane.org)
Received: from ciao.gmane.org (main.gmane.org [80.91.229.2])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 4041243D60
	for <freebsd-hackers@freebsd.org>; Thu, 23 Nov 2006 09:19:08 +0000 (GMT)
	(envelope-from freebsd-hackers@m.gmane.org)
Received: from list by ciao.gmane.org with local (Exim 4.43)
	id 1GnAk9-0002MG-5p
	for freebsd-hackers@freebsd.org; Thu, 23 Nov 2006 10:19:41 +0100
Received: from lara.cc.fer.hr ([161.53.72.113])
	by main.gmane.org with esmtp (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <freebsd-hackers@freebsd.org>; Thu, 23 Nov 2006 10:19:41 +0100
Received: from ivoras by lara.cc.fer.hr with local (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <freebsd-hackers@freebsd.org>; Thu, 23 Nov 2006 10:19:41 +0100
X-Injected-Via-Gmane: http://gmane.org/
To: freebsd-hackers@freebsd.org
From: Ivan Voras <ivoras@fer.hr>
Date: Thu, 23 Nov 2006 10:19:29 +0100
Lines: 12
Message-ID: <ek3p31$i69$1@sea.gmane.org>
References: <ek2ca4$sft$1@sea.gmane.org>
	<ad79ad6b0611221309q85e37e5p224ba93d0b9c9b5@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Complaints-To: usenet@sea.gmane.org
X-Gmane-NNTP-Posting-Host: lara.cc.fer.hr
User-Agent: Thunderbird 1.5.0.4 (X11/20060625)
In-Reply-To: <ad79ad6b0611221309q85e37e5p224ba93d0b9c9b5@mail.gmail.com>
Sender: news <news@sea.gmane.org>
Subject: Re: Kqueue write event position?
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
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: Thu, 23 Nov 2006 09:19:45 -0000

Vlad Galu wrote:

>   It seems to me you would have to propagate that info along the
> VOP_WRITE_POST->VFS_KNOTE_LOCKED->VN_KNOTE->knote() chain. Since
> knote() is generic and is used for all types of notifications, you can
> probably roll down your own replacement and call it from VN_KNOTE. Of
> course, there probably is a better way :)

Before I get any further with this, can anyone predict what would be the 
impact of monitoring a large number of files (50,000 or more) with 
kqueue? For kqueue to work, each file would have to be opened (and take 
up one file descriptor).