Re: [RFC PATCH 0/3] Fix SLQB on memoryless configurations V2

[Sachin Sant]

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@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/