Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753955AbZCJAMr (ORCPT ); Mon, 9 Mar 2009 20:12:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752648AbZCJAMf (ORCPT ); Mon, 9 Mar 2009 20:12:35 -0400 Received: from silver.sucs.swan.ac.uk ([137.44.10.1]:34386 "EHLO silver.sucs.swan.ac.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752525AbZCJAMf (ORCPT ); Mon, 9 Mar 2009 20:12:35 -0400 Date: Tue, 10 Mar 2009 00:12:22 +0000 From: Sitsofe Wheeler To: Frederic Weisbecker Cc: Lai Jiangshan , Steven Rostedt , Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: [TIP,BISECTED] Negative nice values have become big positive numbers Message-ID: <20090310001222.GA1843@silver.sucs.org> References: <20090308231850.GB24445@silver.sucs.org> <20090309201503.GA5010@nowhere> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090309201503.GA5010@nowhere> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1316 Lines: 32 On Mon, Mar 09, 2009 at 09:15:04PM +0100, Frederic Weisbecker wrote: > On Sun, Mar 08, 2009 at 11:18:50PM +0000, Sitsofe Wheeler wrote: > > Formally negative nice values have started become very big in positive > > integers in -tip kernels: > > > > 2 root 15 2147483647 0 0 0 S 0.0 0.0 0:00.00 kthreadd > > The weird thing here is that number: 2147483647 > It is 0xefffffff > Which means -1 without the highest bit (the sign). > I really don't know how it could have happened. > > Anyway, I caught something in the signedness bits from my patch that unifies > the format decoding. > I've never seen your bug on my machine. But I note you have a 32 bits CPU. > Mine is 64 bits with a 64 bits kernel. Perhaps some weird signedness related things > happened because of the signedness bug that the following patch fixes. > > Can you please give it a try? This seems to have fixed the problem (unless I'm mistaken): 2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd Thanks! -- Sitsofe | http://sucs.org/~sits/ -- 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/