Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760021Ab0FQN0P (ORCPT ); Thu, 17 Jun 2010 09:26:15 -0400 Received: from dsl-67-204-24-19.acanac.net ([67.204.24.19]:53118 "EHLO emergent.ellipticsemi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1759979Ab0FQN0N (ORCPT ); Thu, 17 Jun 2010 09:26:13 -0400 Date: Thu, 17 Jun 2010 09:25:54 -0400 From: Nick Bowler To: Andy Whitcroft Cc: David Howells , tytso@mit.edu, Dave Airlie , Dave Airlie , linux-kernel@vger.kernel.org Subject: Re: Why is kslowd accumulating so much CPU time? Message-ID: <20100617132554.GA8409@elliptictech.com> Mail-Followup-To: Andy Whitcroft , David Howells , tytso@mit.edu, Dave Airlie , Dave Airlie , linux-kernel@vger.kernel.org References: <20100613194949.GC8055@thunk.org> <20100614184244.GA11480@elliptictech.com> <20100614214646.GF6666@thunk.org> <18402.1276625268@redhat.com> <20100616143659.GA14616@elliptictech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Elliptic Technologies Inc. User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1049 Lines: 24 On 15:55 Wed 16 Jun , Andy Whitcroft wrote: > On Wed, Jun 16, 2010 at 3:36 PM, Nick Bowler wrote: > > The threads sometimes get pegged immediately after booting the system, > > sometimes it can last an hour or more before showing any problems. > > Unfortunately, this is making bisection essentially impossible. > > > > This seems to have been introduced somewhere between 2.6.35-rc1 and > > I suspect this is introduced by the commit which pulled polling of DRM > connectors into the core. OK. From this hint I looked at the log between -rc1 and -rc2 and found commit fbf81762e385d ("drm/kms: disable/enable poll around switcheroo on/off"). Reverting this commit brings everything back to normal. -- Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/) -- 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/