Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751867Ab3FYHiC (ORCPT ); Tue, 25 Jun 2013 03:38:02 -0400 Received: from gate.crashing.org ([63.228.1.57]:46529 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751028Ab3FYHiA (ORCPT ); Tue, 25 Jun 2013 03:38:00 -0400 Message-ID: <1372145785.3944.195.camel@pasglop> Subject: Re: Regression in RCU subsystem in latest mainline kernel From: Benjamin Herrenschmidt To: Michael Ellerman Cc: "Paul E. McKenney" , Steven Rostedt , linuxppc-dev , Rojhalat Ibrahim , linux-kernel@vger.kernel.org Date: Tue, 25 Jun 2013 17:36:25 +1000 In-Reply-To: <20130625071914.GA29957@concordia> References: <1626500.7WAVXjfS9F@pcimr> <20130614122800.GL5146@linux.vnet.ibm.com> <1645938.As0LR1yeVd@pcimr> <1371243967.9844.338.camel@gandalf.local.home> <1371261741.21896.20.camel@pasglop> <20130617074213.GA3589@concordia> <20130619040906.GA5146@linux.vnet.ibm.com> <20130625071914.GA29957@concordia> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.6.4-0ubuntu1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 633 Lines: 19 On Tue, 2013-06-25 at 17:19 +1000, Michael Ellerman wrote: > Here's another trace from 3.10-rc7 plus a few local patches. > > We suspect that the perf enable could be causing a flood of > interrupts, but why > that's clogging things up so badly who knows. Additionally, perf being potentially NMIs , we might be hitting a bad case of reentrance in RCU ... hard to tell. Cheers, Ben. -- 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/