Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 22 Sep 2002 15:22:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 22 Sep 2002 15:22:20 -0400 Received: from ns.suse.de ([213.95.15.193]:65036 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id ; Sun, 22 Sep 2002 15:22:19 -0400 To: Linus Torvalds Cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH] LTT for 2.5.38 1/9: Core infrastructure References:

From: Andi Kleen Date: 22 Sep 2002 21:27:29 +0200 In-Reply-To: Linus Torvalds's message of "22 Sep 2002 20:36:41 +0200" Message-ID: X-Mailer: Gnus v5.7/Emacs 20.6 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1141 Lines: 17 Linus Torvalds writes: > > I suspect we'll want to have some form of event tracing eventually, but > I'm personally pretty convinced that it needs to be a per-CPU thing, and > the core mechanism would need to be very lightweight. It's easier to build > up complexity on top of a lightweight interface than it is to make a > lightweight interface out of a heavy one. There is an old patch around from SGI that does exactly this. It is a very lightweight binary value tracer that has per CPU buffers. It traces using macros that you can easily add. It's called ktrace (not to be confused with Ingo's ktrace). I've been porting it for some time for my own tracing needs (adding tracing macros as needed but never submitting them). If you're interested I can submit it for 2.5 (without any hooks, people should just add them as needed and then remove them again) -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/