Should we be using CONFIG_PREEMPT_BKL in the Fedora kernel?

Ingo Molnar mingo at elte.hu
Sat Mar 24 16:56:17 UTC 2007


* Pete Zaitcev <zaitcev at redhat.com> wrote:

> > FWIW, I have taken to CONFIG_PREEMPT=y in my hacking kernels because 
> > it exposed on my clunky test machines bugs that were otherwise 
> > reproduced only on big honking machines with lots of parallelism. 
> > [...]
> 
> It helps with that, but I just don't trust it to work at all times. 
> It's a really kludgy code from MontaVista, developed with embedded 
> devices in mind. It's a certified miracle that it boots on SMP at all.

actually, the current code works pretty well - and has been brought to 
the extreme via PREEMPT_RT. It boots fine on SMP and elsewhere, and it 
finds us tons of bugs in every kernel release.

	Ingo




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