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SubjectRe: RFC: Hugepage COW
On Thu, Jul 14, 2005 at 10:24:33AM -0700, Christoph Lameter wrote:
> On Thu, 7 Jul 2005, David Gibson wrote:
>
> > Now that the hugepage code has been consolidated across the
> > architectures, it becomes much easier to implement copy-on-write.
> > Hugepage COW is of limited utility of itself, however, it is
> > essentially a prerequisite for any of a number of methods of allowing
> > userland programs to automatically use hugepages without code changes
> > e.g. hugepage malloc() libraries, implicit hugepage mmap(), hugepage
> > ELF segments. For certain applications (particularly enormous HPC
> > FORTRAN programs), these can result in a large performance
> > improvement.
> >
> > Thoughts? Flames?
>
> Great stuff. I am glad that you are cleaning up the hugepages and are
> making progress improving them. What are your thoughts on implementing
> fault handling for huge pages?

Well, the COW patch implements a fault handler, obviously. What
specifically where you thinking about?

--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/people/dgibson
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