Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030869AbWLPLU3 (ORCPT ); Sat, 16 Dec 2006 06:20:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030872AbWLPLU3 (ORCPT ); Sat, 16 Dec 2006 06:20:29 -0500 Received: from nf-out-0910.google.com ([64.233.182.189]:29158 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030869AbWLPLU2 (ORCPT ); Sat, 16 Dec 2006 06:20:28 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=XmpO/hlBXRqXyOPo9EIX6H5bmTOUdwFvpor1JywkmopcT03nNRVbnOZYqNxsCwmVDZMlLtAtU9aUWcEP00WRQIIsTYxRADS5a5pAttYyhkdcuoEXM05WWiJIuV/CpyNnlyT0LH7h9szss2QoobwYytxMQ8LhMTKFKnSInrvsO1A= Message-ID: <2c0942db0612160320o5f830855y3c607585d5f855f1@mail.gmail.com> Date: Sat, 16 Dec 2006 03:20:26 -0800 From: "Ray Lee" Reply-To: ray-gmail@madrabbit.org To: "Andrew Morton" Subject: Re: 2.6.19-rc5: known regressions (v3) Cc: "Andi Kleen" , "Eric Dumazet" , "Adrian Bunk" , "Linux Kernel Mailing List" , "Stephen Hemminger" , gregkh@suse.de, "Ingo Molnar" , "Len Brown" , phil.el@wanadoo.fr, oprofile-list@lists.sourceforge.net In-Reply-To: <20061122104245.3ce89487.akpm@osdl.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <200611151135.48306.dada1@cosmosbay.com> <200611221128.05769.dada1@cosmosbay.com> <200611221136.14565.ak@suse.de> <20061122104245.3ce89487.akpm@osdl.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1924 Lines: 46 On 11/22/06, Andrew Morton wrote: > On Wed, 22 Nov 2006 11:36:14 +0100 > Andi Kleen wrote: > > > On Wednesday 22 November 2006 11:28, Eric Dumazet wrote: > > > On Wednesday 15 November 2006 11:35, Eric Dumazet wrote: > > > > On Wednesday 15 November 2006 11:21, Adrian Bunk wrote: > > > > > Subject : x86_64: oprofile doesn't work > > > > > References : http://lkml.org/lkml/2006/10/27/3 > > > > > Submitter : Prakash Punnoor > > > > > Status : unknown > > > > > > > > > > I hit the same problem on i386 architecture too, if CONFIG_ACPI is not set. > > > > oprofile is still broken because it cannot deal with the lack of perfctr 0. > > The kernel is still broken because we changed the interface. I just got bit by this on 2.6.20-latest (well, of two days ago anyway) while trying to debug another transient 'kacpid sucks all available cpu time'. But that's okay, I'm sure it will happen again in a week or two. In the meantime, who won this pis^H^H^H discussion? Mikael Pettersson wrote: > Andrew Morton writes: > > Surely the appropriate behaviour is to allow oprofile to steal the NMI and > > to then put the NMI back to doing the watchdog thing after oprofile has > > finished with it. > > Which is _exactly_ what pre-2.6.19-rc1 kernels did. I implemented > the in-kernel API allowing real performance counter drivers like > oprofile (and perfctr) to claim the HW from the NMI watchdog, > do their work, and then release it which resumed the watchdog. > > Note that oprofile (and perfctr) didn't do anything behind the > NMI watchdog's back. They went via the API. Nothing dodgy going on. Well, that seems clear. - 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/