Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751881AbaLPVPv (ORCPT ); Tue, 16 Dec 2014 16:15:51 -0500 Received: from www.linutronix.de ([62.245.132.108]:51741 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751674AbaLPVPt (ORCPT ); Tue, 16 Dec 2014 16:15:49 -0500 Date: Tue, 16 Dec 2014 22:15:34 +0100 (CET) From: Thomas Gleixner To: Jacob Pan cc: Viresh Kumar , "Pan, Jacob jun" , Preeti U Murthy , "Wu, Fengguang" , Frederic Weisbecker , LKML , LKP , "Zijlstra, Peter" Subject: Re: [nohz] 2a16fc93d2c: kernel lockup on idle injection In-Reply-To: <20141216091528.17ee429d@ultegra> Message-ID: References: <20141211194204.GA19083@wfg-t540p.sh.intel.com> <548E8D01.9050707@linux.vnet.ibm.com> <548EAD4A.6070506@linux.vnet.ibm.com> <20141216091528.17ee429d@ultegra> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 16 Dec 2014, Jacob Pan wrote: > On Tue, 16 Dec 2014 09:48:42 +0530 > Viresh Kumar wrote: > > I really don't know what stuff out of the two patches I posted (The > > above one and the fix I posted yesterday), will possible make the > > synchronization bad .. > > > But since your patch has real benefits and does not cause regression > with the current code, there is no reason to hold it back. I was just > hoping to get help on debugging this. As I said elsewhere in this thread, this is not going anywhere. The only sane decision is to revert 2a16fc93d2c9 for now. Aside of that both NOHZ full and powerclamp need to be fixed proper. Both of them are a complete disaster and just a steaming pile of abuse and bandaids fixing the abuse. Read my other replies on that before you ponder to argue. The real solution for both things at the moment would be to make them depend on BROKEN. I'm serious about that, really. Your's grumpy tglx -- 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/