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DateFri, 24 Mar 2006 18:53:31 -0800
FromAndrew Morton <>
SubjectRe: 2.6.16 hugetlbfs problem - DEBUG_PAGEALLOC
"Chen, Kenneth W" <kenneth.w.chen@intel.com> wrote:
>
> Mark Rustad wrote on Friday, March 24, 2006 9:52 AM
>  > I have narrowed this down to DEBUG_PAGEALLOC. If that option is  
>  > enabled, attempts to reference areas mmap-ed from hugetlbfs files  
>  > fault forever. You can see that I had that set in the failing config  
>  > I reported below.
> 
>  Yeah, it turns out that the debug option is not compatible with hugetlb
>  page support. That debug option turns off PSE. Once it is turned off in
>  CR4, cpu will ignore pse bit in the pmd and causing infinite page-not-
>  present fault :-(

I wonder if any of the other architectures which implement both these
features might have problems too.

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