Messages in this thread | | | Date | Tue, 22 Sep 2009 18:35:05 +0530 | From | Sachin Sant <> | Subject | Re: [RFC PATCH 0/3] Fix SLQB on memoryless configurations V2 |
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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
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--------------------------------- Sachin Sant IBM Linux Technology Center India Systems and Technology Labs Bangalore, India ---------------------------------
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