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SubjectRe: [patch] oprofile for ppc
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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