On Mon, 2013-01-21 at 07:42 +0100, Mike Galbraith wrote: 
> On Mon, 2013-01-21 at 13:07 +0800, Michael Wang wrote:

> > May be we could try change this back to the old way later, after the aim
> > 7 test on my server.
> 
> Yeah, something funny is going on.

Never entering balance path kills the collapse.  Asking wake_affine()
wrt the pull as before, but allowing us to continue should no idle cpu
be found, still collapsed.  So the source of funny behavior is indeed in
balance_path.

-Mike

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