From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [patch 0/3] [Announcement] Performance Counters for Linux Date: Fri, 05 Dec 2008 12:08:14 -0800 (PST) Message-ID: <20081205.120814.51226316.davem@davemloft.net> References: <20081205.002701.172921476.davem@davemloft.net> <20081205084233.GE2030@elte.hu> <87ej0mx0c0.fsf@basil.nowhere.org> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:33248 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754052AbYLEUIO (ORCPT ); Fri, 5 Dec 2008 15:08:14 -0500 In-Reply-To: <87ej0mx0c0.fsf@basil.nowhere.org> Sender: linux-arch-owner@vger.kernel.org List-ID: To: andi@firstfloor.org Cc: mingo@elte.hu, a.p.zijlstra@chello.nl, paulus@samba.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, akpm@linux-foundation.org, eranian@googlemail.com, dada1@cosmosbay.com, robert.richter@amd.com, arjan@infradead.org, hpa@zytor.com, rostedt@goodmis.org From: Andi Kleen Date: Fri, 05 Dec 2008 13:39:43 +0100 > Given these are more obscure features, but not being able to fit > them easily into your model from the start isn't a very promising sign > for the long term extensibility of the design. Another thing I'm interested in is if this new stuff will work with performance counters that lack an overflow interrupt. We have several chips that are like this, and perfmon supported that on the kernel side, and also provided overflow emulation for such hardware in userspace (where such complexity belongs).