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

[Peter Zijlstra]

On Thu, 2010-01-07 at 08:19 -0800, Linus Torvalds wrote:
> 
> So now some paths are indeed holding it for writing (or need to wait for 
> it to become writable). And the fairness of rwsems quite possibly then 
> impacts throughput a _lot_.. 

Right, supposing we can make this speculative fault stuff work, then we
can basically reduce the mmap_sem usage in fault to:

  - allocating new page tables
  - extending the growable vmas

And do everything else without holding it, including zeroing and IO.



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