Messages in this thread | | | Date | Tue, 22 Sep 2009 14:20:19 +0100 | From | Mel Gorman <> | Subject | Re: [RFC PATCH 0/3] Fix SLQB on memoryless configurations V2 |
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On Tue, Sep 22, 2009 at 06:35:05PM +0530, Sachin Sant wrote: > 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 >
That is commit c2a7e818019f20a5cf7fb26a6eb59e212e6c0cd8.
> If i revert this patch i am able to boot latest git > on a powerpc box. >
Ok, this is then independent of the corruption I was seeing which I now believe is based entirely within SLQBs handling of remote nodes. I was based on 2.6.31 with SLQB applied on top. This patch was applied in a time after the baseline I was working from.
Tejun, have you looked at that stall problem? Sorry if you have already, I haven't dug around for related threads.
-- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab
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