From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with ESMTP id 5C82B6B00A1 for ; Tue, 22 Sep 2009 09:05:13 -0400 (EDT) Received: from d23relay01.au.ibm.com (d23relay01.au.ibm.com [202.81.31.243]) by e23smtp08.au.ibm.com (8.14.3/8.13.1) with ESMTP id n8MCwnTT004543 for ; Tue, 22 Sep 2009 22:58:49 +1000 Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay01.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id n8MD59FO246058 for ; Tue, 22 Sep 2009 23:05:10 +1000 Received: from d23av04.au.ibm.com (loopback [127.0.0.1]) by d23av04.au.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id n8MD58c7011992 for ; Tue, 22 Sep 2009 23:05:08 +1000 Message-ID: <4AB8CB81.4080309@in.ibm.com> Date: Tue, 22 Sep 2009 18:35:05 +0530 From: Sachin Sant MIME-Version: 1.0 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: owner-linux-mm@kvack.org 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 List-ID: 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org