Re: [git pull] scheduler fixes

[Ingo Molnar]

* Matthew Wilcox <matthew@xxxxxx> wrote:

> > So why not transform it to real completions instead? And if our 
> > current 'struct completion' abstraction is insufficient for whatever 
> > reason, why not extend that instead?
> 
> My point is that for the only user of counting semaphores and/or 
> semaphores-abused-as-completions that has so far hit this race, the 
> serialised wake-up performs better.  You have not pointed at a 
> scenario that _shows_ a parallel wake-up to perform better. [...]

a 50% AIM7 slowdown maybe? With the BKL being a spinlock again it doesnt 
matter much in practice though.

	Ingo
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