Messages in this thread | | | Date | Mon, 10 Mar 2003 04:50:43 +0100 | From | Segher Boessenkool <> | Subject | Re: [patch] oprofile for ppc |
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Benjamin Herrenschmidt wrote: > Beware though that some G4s have a nasty bug that prevents > using the performance counter interrupt (and the thermal interrupt > as well).
MPC7400 version 1.2 and lower have this problem.
> The problem is that if any of those fall at the same > time as the DEC interrupt, the CPU messes up it's internal > state and you lose SRR0/SRR1, which means you can't recover > from the exception.
But the worst that happens is that you lose that process, isn't it? Not all that big a problem, esp. since the window in which this can happen is very small.
Segher
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