From owner-freebsd-arch@FreeBSD.ORG Fri Jul 1 14:08:18 2005 Return-Path: X-Original-To: arch@FreeBSD.org Delivered-To: freebsd-arch@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8BDF516A422; Fri, 1 Jul 2005 14:08:18 +0000 (GMT) (envelope-from jhb@FreeBSD.org) Received: from mv.twc.weather.com (mv.twc.weather.com [65.212.71.225]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4A8E243EFB; Fri, 1 Jul 2005 14:05:45 +0000 (GMT) (envelope-from jhb@FreeBSD.org) Received: from [10.50.41.231] (Not Verified[65.202.103.25]) by mv.twc.weather.com with NetIQ MailMarshal (v6, 0, 3, 8) id ; Fri, 01 Jul 2005 10:19:33 -0400 From: John Baldwin To: Peter Edwards Date: Fri, 1 Jul 2005 10:05:20 -0400 User-Agent: KMail/1.8 References: <20050701132104.GA95135@freefall.freebsd.org> In-Reply-To: <20050701132104.GA95135@freefall.freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200507011005.21343.jhb@FreeBSD.org> Cc: arch@FreeBSD.org Subject: Re: ktrace and KTR_DROP X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Jul 2005 14:08:18 -0000 On Friday 01 July 2005 09:21 am, Peter Edwards wrote: > Y'all, > > Ever since the introduction of a separate ktrace worker thread for > writing output, there's the distinct possibility that ktrace output > will drop requests. For some proceses, it's actually inevitable: > as long as the traced processes can sustain a rate of generating > ktrace events faster than the ktrace thread can write them, you'll > eventually run out of ktrace requests. The patch looks good to me, and I'd even be ok with having neverdrop on by default. -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org