Re: [git pull] scheduler fixes

Ingo Molnar
2008-05-13T14:12:10Z

* Matthew Wilcox <matthew@wil.cx> 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