Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935127AbXKQA3U (ORCPT ); Fri, 16 Nov 2007 19:29:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759756AbXKQA3N (ORCPT ); Fri, 16 Nov 2007 19:29:13 -0500 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:49445 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751399AbXKQA3M (ORCPT ); Fri, 16 Nov 2007 19:29:12 -0500 Date: Fri, 16 Nov 2007 16:29:05 -0800 (PST) Message-Id: <20071116.162905.143357955.davem@davemloft.net> To: dean@arctic.org Cc: andi@firstfloor.org, mucci@cs.utk.edu, akpm@linux-foundation.org, gregkh@suse.de, eranian@hpl.hp.com, wcohen@redhat.com, robert.richter@amd.com, linux-kernel@vger.kernel.org, ptools-perfapi@cs.utk.edu Subject: Re: perfmon2 merge news From: David Miller In-Reply-To: References: X-Mailer: Mew version 5.2 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1346 Lines: 31 From: dean gaudet Date: Fri, 16 Nov 2007 09:51:08 -0800 (PST) > On Fri, 16 Nov 2007, Andi Kleen wrote: > > > I didn't see a clear list. > > - cross platform extensible API for configuring perf counters > - support for multiplexed counters > - support for virtualized 64-bit counters > - support for PC and call graph sampling at specific intervals > - support for reading counters not necessarily with sampling > - taskswitch support for counters > - API available from userland > - ability to self-monitor: need select/poll/etc interface > - support for PEBS, IBS and whatever other new perf monitoring > infrastructure the vendors through at us in the future > - low overhead: must minimize the "probe effect" of monitoring > - low noise in measurements: cannot achieve this in userland > > permon2 has all of this and more i've probably neglected... I want to state that even though I've been a stickler on the system call stuff, in general I want to see perfmon2 go into tree and I agree with how most of the infrastructure is implemented and the features it provides. - 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/