Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755625AbWKQKIO (ORCPT ); Fri, 17 Nov 2006 05:08:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755647AbWKQKIO (ORCPT ); Fri, 17 Nov 2006 05:08:14 -0500 Received: from aun.it.uu.se ([130.238.12.36]:60908 "EHLO aun.it.uu.se") by vger.kernel.org with ESMTP id S1755623AbWKQKIM (ORCPT ); Fri, 17 Nov 2006 05:08:12 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <17757.34795.689658.106603@alkaid.it.uu.se> Date: Fri, 17 Nov 2006 10:59:07 +0100 From: Mikael Pettersson To: Andrew Morton Cc: Mikael Pettersson , ebiederm@xmission.com (Eric W. Biederman), Andi Kleen , Linus Torvalds , discuss@x86-64.org, William Cohen , 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 , gregkh@suse.de, Linux Kernel Mailing List , Andrey Borzenkov Subject: Re: [discuss] Re: 2.6.19-rc5: known regressions (v3) In-Reply-To: <20061116122358.996fdbb3.akpm@osdl.org> References: <200611151945.31535.ak@suse.de> <200611152023.53960.ak@suse.de> <20061115122118.14fa2177.akpm@osdl.org> <20061115133121.8d9d621f.akpm@osdl.org> <17756.17330.974883.486535@alkaid.it.uu.se> <20061116122358.996fdbb3.akpm@osdl.org> X-Mailer: VM 7.17 under Emacs 20.7.1 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1133 Lines: 25 Andrew Morton writes: > On Thu, 16 Nov 2006 11:55:46 +0100 > 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. > > OK. But from Andi's comments it seems that the NMI watchdog was failing to > resume its operation. It certainly worked when I originally implemented it. If it didn't work that way before 2.6.19-rc1 butchered it then that would have been a bug that should have been fixed. - 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/