Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933553AbaLCA0p (ORCPT ); Tue, 2 Dec 2014 19:26:45 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:34515 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750877AbaLCA0o (ORCPT ); Tue, 2 Dec 2014 19:26:44 -0500 Message-ID: <547E5895.9040405@oracle.com> Date: Tue, 02 Dec 2014 19:25:57 -0500 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Linus Torvalds , Peter Zijlstra , Ingo Molnar CC: Dave Jones , Chris Mason , =?UTF-8?B?RMOibmllbCBGcmFnYQ==?= , "Paul E. McKenney" , Linux Kernel Mailing List Subject: Re: frequent lockups in 3.18rc4 References: <20141127225637.GA24019@redhat.com> <547b8a45.6e608c0a.20f9.1002@mx.google.com> <547bbe36.48548c0a.105c.779c@mx.google.com> <20141201191431.GA17385@linux.vnet.ibm.com> <547ccf74.a5198c0a.25de.26d9@mx.google.com> <20141201230339.GA20487@ret.masoncoding.com> <20141202193252.GB17595@redhat.com> <547E4C14.6040509@oracle.com> In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Source-IP: acsinet22.oracle.com [141.146.126.238] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/02/2014 07:09 PM, Linus Torvalds wrote: > On Tue, Dec 2, 2014 at 3:32 PM, Sasha Levin wrote: >> > >> > I've disabled lock debugging to see if anything new will show up, and hit >> > something that may be related: > Very interesting. But your source code doesn't match mine - can you > say what that > > kernel/sched/fair.c:4541:17 > > line is? Sorry about that, I'm testing on the -next kernel. The relevant code snippet is in wake_affine: prev_eff_load = 100 + (sd->imbalance_pct - 100) / 2; prev_eff_load *= capacity_of(this_cpu); if (this_load > 0) { this_eff_load *= this_load + effective_load(tg, this_cpu, weight, weight); <==== This one prev_eff_load *= load + effective_load(tg, prev_cpu, 0, weight); } Thanks, Sasha -- 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/