On Mon, 2011-01-17 at 23:12 -0800, Hugh Dickins wrote:

18/21 mutex-provide_mutex_is_contended.patch
      I suppose so, though if we use it in the truncate path, then we are
      stuck with the vm_truncate_count stuff I'd rather hoped would go away;
      but I guess you're right, that if we did spin_needbreak/need_lockbreak
      before, then we ought to do this now - though I suspect I only added
      it because I had to insert a resched-point anyway, and it seemed a good
      idea at the time to check lockbreak too since that had just been added. 

Like the other missed cleanups now possible, these are things we can
most definitely look at once the dust settles a bit. I just didn't want
to rewrite the world in one go.

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