Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()

[Peter Zijlstra]

On Thu, 2010-01-07 at 09:49 -0800, Linus Torvalds wrote:
> 
> The thing is, I can pretty much _guarantee_ that the speculative page 
> fault is going to end up doing a lot of nasty stuff that still needs 
> almost-global locking, and it's likely to be more complicated and slower 
> for the single-threaded case (you end up needing refcounts, a new "local" 
> lock or something).

Well, with that sync_vma() thing I posted the other day all the
speculative page fault needs is a write to current->fault_vma, the ptl
and an O(nr_threads) loop on unmap() for file vmas -- aside from writing
the pte itself of course.




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