Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030859AbWKOSp7 (ORCPT ); Wed, 15 Nov 2006 13:45:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030863AbWKOSp6 (ORCPT ); Wed, 15 Nov 2006 13:45:58 -0500 Received: from cantor2.suse.de ([195.135.220.15]:40412 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S1030859AbWKOSp4 (ORCPT ); Wed, 15 Nov 2006 13:45:56 -0500 From: Andi Kleen To: Andrew Morton Subject: Re: [discuss] Re: 2.6.19-rc5: known regressions (v3) Date: Wed, 15 Nov 2006 19:45:30 +0100 User-Agent: KMail/1.9.5 Cc: discuss@x86-64.org, William Cohen , Eric Dumazet , Komuro , Ernst Herzberg , Andre Noll , oprofile-list@lists.sourceforge.net, Jens Axboe , linux-usb-devel@lists.sourceforge.net, phil.el@wanadoo.fr, Adrian Bunk , Ingo Molnar , Alan Stern , linux-pci@atrey.karlin.mff.cuni.cz, Stephen Hemminger , Prakash Punnoor , Len Brown , Alex Romosan , Linus Torvalds , gregkh@suse.de, Linux Kernel Mailing List , "Eric W. Biederman" , Andrey Borzenkov References: <200611151748.05989.ak@suse.de> <20061115103915.46a70283.akpm@osdl.org> In-Reply-To: <20061115103915.46a70283.akpm@osdl.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200611151945.31535.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1345 Lines: 30 On Wednesday 15 November 2006 19:39, Andrew Morton wrote: > On Wed, 15 Nov 2006 17:48:05 +0100 > Andi Kleen wrote: > > > > > > OProfile has a simplistic view of the performance monitoring hardware. The > > > routines in libop/op_alloc_counter.c determine what set of performance registers > > > is available from the processor in use. There is no check to see what registers > > > are actually available in the /dev/oprofile directory. > > > > > > opcontrol executes ophelp to determine which specific counters to count which > > > events. The function map_event_to_counter() in libop/op_alloc_counter.c does the > > > actual selection. It seems what is needed is for map_event_to_counter() to check > > > to see which counters are available and mark the others as unavailable > > > > Thanks for the explanation. Can you please fix it and release a new version? > > Documentation/Changes could be adapted then. > > > > Meanwhile we should restore the NMI counter to fix this bug. No, it was always oprofile who was buggy here, silently taking the nmi watchdog away. -Andi - 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/