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    SubjectRe: [RFC PATCH 0/3] Fix SLQB on memoryless configurations V2
    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:
    >> 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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      Last update: 2009-09-22 15:23    [W:0.091 / U:1.248 seconds]
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