From owner-freebsd-current@FreeBSD.ORG Fri Aug 22 19:20:36 2014 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id B0E0A574 for ; Fri, 22 Aug 2014 19:20:36 +0000 (UTC) Received: from h2.funkthat.com (gate2.funkthat.com [208.87.223.18]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "funkthat.com", Issuer "funkthat.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 8C70739B8 for ; Fri, 22 Aug 2014 19:20:36 +0000 (UTC) Received: from h2.funkthat.com (localhost [127.0.0.1]) by h2.funkthat.com (8.14.3/8.14.3) with ESMTP id s7MJKYZ5043119 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 22 Aug 2014 12:20:35 -0700 (PDT) (envelope-from jmg@h2.funkthat.com) Received: (from jmg@localhost) by h2.funkthat.com (8.14.3/8.14.3/Submit) id s7MJKYvx043118; Fri, 22 Aug 2014 12:20:34 -0700 (PDT) (envelope-from jmg) Date: Fri, 22 Aug 2014 12:20:34 -0700 From: John-Mark Gurney To: Eric van Gyzen Subject: Re: ktrace -c behavior Message-ID: <20140822192034.GA71691@funkthat.com> Mail-Followup-To: Eric van Gyzen , freebsd-current@freebsd.org References: <53F79710.6090700@vangyzen.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <53F79710.6090700@vangyzen.net> User-Agent: Mutt/1.4.2.3i X-Operating-System: FreeBSD 7.2-RELEASE i386 X-PGP-Fingerprint: 54BA 873B 6515 3F10 9E88 9322 9CB1 8F74 6D3F A396 X-Files: The truth is out there X-URL: http://resnet.uoregon.edu/~gurney_j/ X-Resume: http://resnet.uoregon.edu/~gurney_j/resume.html X-TipJar: bitcoin:13Qmb6AeTgQecazTWph4XasEsP7nGRbAPE X-to-the-FBI-CIA-and-NSA: HI! HOW YA DOIN? can i haz chizburger? X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.2 (h2.funkthat.com [127.0.0.1]); Fri, 22 Aug 2014 12:20:35 -0700 (PDT) Cc: freebsd-current@freebsd.org X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Aug 2014 19:20:36 -0000 Eric van Gyzen wrote this message on Fri, Aug 22, 2014 at 15:16 -0400: > What behavior would you expect from this sequence of commands? > > ktrace -tw -p 1234 > ktrace -c -p 1234 > > Based on this... > > -c Clear the trace points associated with the specified file > or processes. and/or just add specified: Clear the specified trace points ... > ...I would expect the second command to clear the trace point for > context switches. It doesn't. I have to specify -tw with the -c to get > that behavior. This makes sense; it's just not what I was expecting. > > Assuming we want to keep this behavior, can we clarify the -c flag in > man page? I would suggest: > > If the -t flag is not specified, clear the default set of trace points. Maybe we should add a new trace point string that is a (for all).. so you can do ktrace -ta -c? -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."