Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756712Ab0A2Hzi (ORCPT ); Fri, 29 Jan 2010 02:55:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752540Ab0A2Hze (ORCPT ); Fri, 29 Jan 2010 02:55:34 -0500 Received: from e3.ny.us.ibm.com ([32.97.182.143]:59268 "EHLO e3.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751387Ab0A2Hzd (ORCPT ); Fri, 29 Jan 2010 02:55:33 -0500 Date: Fri, 29 Jan 2010 13:25:29 +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: <20100129075529.GG16920@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> <20100129075240.GF16920@in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100129075240.GF16920@in.ibm.com> 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: 1351 Lines: 30 On Fri, Jan 29, 2010 at 01:22:40PM +0530, Ananth N Mavinakayanahalli wrote: > 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'. Oh, and the x86 instruction decoder was initially implemented by us. Masami has done a great job making it more complete. 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/