Re: [PATCH RFC] reduce runqueue lock contention

[Peter Zijlstra]

On Wed, 2010-12-01 at 15:13 -0800, Frank Rowand wrote:
> 
>   If the task to be woken is on a run queue on a different cpu then use
>   cmpxchg() to put it onto a pending try_to_wake_up list on the different
>   cpu.  Then send an interrupt to the different cpu to cause that cpu to
>   call try_to_wake_up() for each process on the try_to_wake_up list. 

Without having looked at the actual code, the described thing cannot
work, try_to_wake_up() has a return value that needs to be passed back.

Also, try_to_wake_up() does load-balancing, you really want to do that
before queueing it on a remote cpu.
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