On Mon, 13 Mar 2000, Jeff Garzik wrote:
> > if (current->spinlock_depth)
> > BUG();
> >
> > this temporary debugging aid catches illegal spinlock uses. (which does
> > happen quite often)
>
> FWIW running an SMP kernel on UP is an excellent way to catch spinlock
> bugs... [...]
this still does not catch the above bug :-) a slightly better
(IRQ-context) spinlock-debugging method is IMHO running an SMP kernel on a
real SMP system, with:
append='maxcpus=1'
in lilo.conf, it has the advantage of the UP kernels' heavy rescheduling,
and has the NMI watchdog in case some spinlock bug causes a lockup... And
nothing beats running a real SMP system, the more subtle spinlock bugs
simply do not show up on UP.
Ingo
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This archive was generated by hypermail 2b29 : Wed Mar 15 2000 - 21:00:25 EST