Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751817AbcC0Uxh (ORCPT ); Sun, 27 Mar 2016 16:53:37 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:44022 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750861AbcC0Uxg (ORCPT ); Sun, 27 Mar 2016 16:53:36 -0400 Date: Sun, 27 Mar 2016 22:53:18 +0200 From: Peter Zijlstra To: "Paul E. McKenney" Cc: Mathieu Desnoyers , "Chatre, Reinette" , Jacob Pan , Josh Triplett , Ross Green , John Stultz , Thomas Gleixner , lkml , Ingo Molnar , Lai Jiangshan , dipankar@in.ibm.com, Andrew Morton , rostedt , David Howells , Eric Dumazet , Darren Hart , =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker , Oleg Nesterov , pranith kumar Subject: Re: rcu_preempt self-detected stall on CPU from 4.5-rc3, since 3.17 Message-ID: <20160327205318.GX6356@twins.programming.kicks-ass.net> References: <20160318235641.GH4287@linux.vnet.ibm.com> <0D818C7A2259ED42912C1E04120FDE26712E676E@ORSMSX111.amr.corp.intel.com> <20160325214623.GR4287@linux.vnet.ibm.com> <1370753660.36931.1458995371427.JavaMail.zimbra@efficios.com> <20160326152816.GW4287@linux.vnet.ibm.com> <20160326184940.GA23851@linux.vnet.ibm.com> <706246733.37102.1459030977316.JavaMail.zimbra@efficios.com> <20160327013456.GX4287@linux.vnet.ibm.com> <702204510.37291.1459086535844.JavaMail.zimbra@efficios.com> <20160327154018.GA4287@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160327154018.GA4287@linux.vnet.ibm.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 393 Lines: 9 On Sun, Mar 27, 2016 at 08:40:18AM -0700, Paul E. McKenney wrote: > Oh, and the patch I am running with is below. I am running x86, and so > some other architectures would of course need the corresponding patch > on that architecture. > -#define TIF_POLLING_NRFLAG 21 /* idle is polling for TIF_NEED_RESCHED */ Also note that ARM (v7) which Ross is running doesn't have this to begin with.