[ofa-general] Re: [PATCH 08 of 11] anon-vma-rwsem

[Christoph Lameter]

On Thu, 15 May 2008, Nick Piggin wrote:

> Oh, I get that confused because of the mixed up naming conventions
> there: unmap_page_range should actually be called zap_page_range. But
> at any rate, yes we can easily zap pagetables without holding mmap_sem.

How is that synchronized with code that walks the same pagetable. These 
walks may not hold mmap_sem either. I would expect that one could only 
remove a portion of the pagetable where we have some sort of guarantee 
that no accesses occur. So the removal of the vma prior ensures that?