Re: [LSF/MM ATTEND] Huge Page Futures

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

Mike Kravetz <mike.kravetz@oracle.com> writes:

> In a search of the archives, it appears huge page support in one form or
> another has been a discussion topic in almost every LSF/MM gathering. Based
> on patches submitted this past year, huge pages is still an area of active
> development.  And, it appears this level of activity will  continue in the
> coming year.
>
> I propose a "Huge Page Futures" session to discuss large works in progress
> as well as work people are considering for 2016.  Areas of discussion would
> minimally include:
>
> - Krill Shutemov's THP new refcounting code and the push for huge page
>   support in the page cache.

I am also interested in this discussion. We had some nice challenge
w.r.t to powerpc implementation of THP.

>
> - Matt Wilcox's huge page support in DAX enabled filesystems, but perhaps
>   more interesting is the desire for supporting PUD pages.  This seems to
>   beg the question of supporting transparent PUD pages elsewhere.
>

I am also looking at switching powerpc hugetlbfs to GENERAL_HUGETLB. To
support 16GB pages I would need hugepage at PUD/PGD. Can you elaborate
why supporting huge PUD page is a challenge ?

-aneesh

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