Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756515AbZIVNFL (ORCPT ); Tue, 22 Sep 2009 09:05:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756465AbZIVNFK (ORCPT ); Tue, 22 Sep 2009 09:05:10 -0400 Received: from e23smtp03.au.ibm.com ([202.81.31.145]:60371 "EHLO e23smtp03.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756442AbZIVNFI (ORCPT ); Tue, 22 Sep 2009 09:05:08 -0400 Message-ID: <4AB8CB81.4080309@in.ibm.com> Date: Tue, 22 Sep 2009 18:35:05 +0530 From: Sachin Sant User-Agent: Thunderbird 2.0.0.22 (X11/20090609) MIME-Version: 1.0 To: Mel Gorman CC: Christoph Lameter , Nick Piggin , Pekka Enberg , heiko.carstens@de.ibm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Tejun Heo , Benjamin Herrenschmidt Subject: Re: [RFC PATCH 0/3] Fix SLQB on memoryless configurations V2 References: <1253549426-917-1-git-send-email-mel@csn.ul.ie> <20090921174656.GS12726@csn.ul.ie> <20090921180739.GT12726@csn.ul.ie> <4AB85A8F.6010106@in.ibm.com> <20090922125546.GA25965@csn.ul.ie> In-Reply-To: <20090922125546.GA25965@csn.ul.ie> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2283 Lines: 72 Mel Gorman wrote: > On Tue, Sep 22, 2009 at 10:33:11AM +0530, Sachin Sant wrote: > >> Mel Gorman wrote: >> >>> On Mon, Sep 21, 2009 at 01:54:12PM -0400, Christoph Lameter wrote: >>> >>> >>>> Lets just keep SLQB back until the basic issues with memoryless nodes are >>>> resolved. >>>> >>>> >>> It's not even super-clear that the memoryless nodes issues are entirely >>> related to SLQB. Sachin for example says that there was a stall issue >>> with memoryless nodes that could be triggered without SLQB. Sachin, is >>> that still accurate? >>> >>> >> I think there are two different problems that we are dealing with. >> >> First one is the SLQB not working on a ppc64 box which seems to be specific >> to only one machine and i haven't seen that on other power boxes.The patches >> that you have posted seems to allow the box to boot, but eventually it hits >> the stall issue(related to percpu dynamic allocator not working on ppc64), >> which is the second problem we are dealing with. >> >> > > Ok, I've sent out V3 of this. It's only a partial fix but it's about as > far as it can be brought until the other difficulties are resolved. > Thanks Mel. > >> The stall issue seems to be much more critical as it is affecting almost >> all of the power boxes that i have tested with (4 in all). >> This issue is seen with Linus tree as well and was first seen with >> 2.6.31-git5 (0cb583fd..) >> >> The stall issue was reported here: >> http://lists.ozlabs.org/pipermail/linuxppc-dev/2009-September/075791.html >> >> > > Can you bisect this please? > The problem seems to have been introduced with commit ada3fa15057205b7d3f727bba5cd26b5912e350f. Specifically this patch : powerpc64: convert to dynamic percpu allocator If i revert this patch i am able to boot latest git on a powerpc box. Thanks -Sachin -- --------------------------------- Sachin Sant IBM Linux Technology Center India Systems and Technology Labs Bangalore, India --------------------------------- -- 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/