Messages in this thread | | | Date | Tue, 13 May 2008 16:11:29 +0200 | From | Ingo Molnar <> | Subject | Re: [git pull] scheduler fixes |
| |
* 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
| |