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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