Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757215AbYLLGWj (ORCPT ); Fri, 12 Dec 2008 01:22:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751440AbYLLGW3 (ORCPT ); Fri, 12 Dec 2008 01:22:29 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:35529 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751411AbYLLGW3 (ORCPT ); Fri, 12 Dec 2008 01:22:29 -0500 Date: Fri, 12 Dec 2008 07:22:00 +0100 From: Ingo Molnar To: Andrew Morton Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de, eranian@googlemail.com, dada1@cosmosbay.com, robert.richter@amd.com, arjan@infradead.org, hpa@zytor.com, a.p.zijlstra@chello.nl, paulus@samba.org, davem@davemloft.net Subject: Re: [patch] Performance Counters for Linux, v3 Message-ID: <20081212062200.GD12451@elte.hu> References: <20081211155230.GA4230@elte.hu> <20081211103504.73ecabdd.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081211103504.73ecabdd.akpm@linux-foundation.org> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2024 Lines: 39 * Andrew Morton wrote: > On Thu, 11 Dec 2008 16:52:30 +0100 > Ingo Molnar wrote: > > > To: linux-kernel@vger.kernel.org > > Cc: Thomas Gleixner , Andrew Morton , Stephane Eranian , Eric Dumazet , Robert Richter , Arjan van de Veen , Peter Anvin , Peter Zijlstra , Paul Mackerras , "David S. Miller" > > Please copy perfctr-devel@lists.sourceforge.net on all this. That is > where the real-world people who use these facilities on a regular basis > hang out. Sure, we'll do that for v4. The reason we kept posting this to lkml initially was because there is a visible detachment of this community from kernel developers. And that is at least in part because this stuff has never been made interesting enough to kernel developers. I dont remember a _single_ perfmon-generated profile (be that user-space or kernel-space) in my mailbox before - and optimizing the kernel is supposed to be one of the most important aspects of performance tuning. That's why we concentrate on making this useful and interesting to kernel developers too via KernelTop, that's why we made the BTS/[PEBS] hardware tracer available via an ftrace plugin, etc. Furthermore, kernel developers tend to be quite good at co-designing, influencing [and flaming ;-) ] such APIs at the early prototype stages, so the main early technical feedback we were looking for on the kernel side structure was lkml. But the wider community is not ignored either, of course - with v4 it might be useful already for wider circulation. Ingo -- 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/