Re: hugepage patches

[ebiederm@xmission.com (Eric W. Biederman)]

"Martin J. Bligh" <mbligh@aracnet.com> writes:

> > Did I misunderstand what was meant by a massively shared mapping?
> > 
> > I can't imagine it being useful to guys like oracle without MAP_SHARED
> > support....
> 
> Create a huge shmem segment. and don't share the pagetables. Without large
> pages, it's an enormous waste of space in mindless duplication. With large
> pages, it's a much smaller waste of space (no PTEs) in mindless
> duplication. 
> Still not optimal, but makes the problem manageable.

And this is exactly the mmap(MAP_SHARED) case.  Where a single memory
segment is shared between multiple mm's. 

Eric


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