Re: [PATCH 2.5.43-mm2] New shared page table patch

[Andrew Morton]

Benjamin LaHaise wrote:
> 
> On Tue, Oct 22, 2002 at 10:36:40AM -0700, Martin J. Bligh wrote:
> > Bear in mind that large pages are neither swap backed or file backed
> > (vetoed by Linus), for starters. There are other large app problem scenarios
> > apart from Oracle ;-)
> 
> I think the fact that large page support doesn't support mmap for users
> that need it is utterly appauling; there are numerous places where it is
> needed.  The requirement for root-only access makes it useless for most
> people, especially in HPC environments where it is most needed as such
> machines are usually shared and accounts are non-priveledged.
> 

Have you reviewed the hugetlbfs and hugetlbpage-backed-shm patches?

That code is still requiring CAP_IPC_LOCK, although I suspect it
would be better to allow hugetlbfs mmap to be purely administered
by file permissions.