Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756610Ab0A2Hww (ORCPT ); Fri, 29 Jan 2010 02:52:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754169Ab0A2Hwv (ORCPT ); Fri, 29 Jan 2010 02:52:51 -0500 Received: from e34.co.us.ibm.com ([32.97.110.152]:59714 "EHLO e34.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754009Ab0A2Hwu (ORCPT ); Fri, 29 Jan 2010 02:52:50 -0500 Date: Fri, 29 Jan 2010 13:22:40 +0530 From: Ananth N Mavinakayanahalli To: Ingo Molnar Cc: Jim Keniston , Stephen Rothwell , Kyle Moffett , Arnaldo Carvalho de Melo , Peter Zijlstra , Fr??d??ric Weisbecker , Oleg Nesterov , Steven Rostedt , LKML , Tom Tromey , "Frank Ch. Eigler" , linux-next@vger.kernel.org, "H. Peter Anvin" , utrace-devel@redhat.com, Linus Torvalds , Thomas Gleixner Subject: Re: linux-next: add utrace tree Message-ID: <20100129075240.GF16920@in.ibm.com> Reply-To: ananth@in.ibm.com References: <1264575134.4283.1983.camel@laptop> <20100127085442.GA28422@elte.hu> <1264643539.5068.62.camel@localhost.localdomain> <20100128085502.GA7713@elte.hu> <1264726768.4933.50.camel@localhost.localdomain> <20100129073907.GF14636@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100129073907.GF14636@elte.hu> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1122 Lines: 27 On Fri, Jan 29, 2010 at 08:39:07AM +0100, Ingo Molnar wrote: ... > When we merged kprobes ~10 years ago we made the (rather bad) mistake of > merging a raw, opaque facility and leaving 'the rest' up to some other entity. > IBM kprobes hackers vanished the day the original kprobes code went upstream > and the high level entity never truly materialized in-kernel, for nearly a > decade! I don't know what you are referring to here... Kprobes was merged in 2.6.9 (~August 2004 -- less than 6 years ago). Since then, we did work on ports to powerpc and s390. We implemented kretprobes. We made it much scalable using RCU; we did the powerpc booster to skip single-step when possible, not to mention various bug fixes over the years. Yes, we did not do the perf integration, but perf did not exist then, either. Its simply wrong to say people 'vanished'. Thanks, Ananth -- 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/