Re: [PATCH] powerpc: perf: Fix frequency calculation for overflowing counters

Peter Zijlstra
2011-01-17T17:37:54Z

On Mon, 2011-01-17 at 11:32 -0600, Scott Wood wrote:
> > diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c
> > index 5674807..ab6f6be 100644
> > --- a/arch/powerpc/kernel/perf_event.c
> > +++ b/arch/powerpc/kernel/perf_event.c
> > @@ -1212,6 +1212,7 @@ static void record_and_restart(struct perf_event *event, unsigned long val,
> > if (left <= 0)
> > left = period;
> > record = 1;
> > + event->hw.last_period = event->hw.sample_period;
> > }
> > if (left < 0x80000000LL)
> > val = 0x80000000LL - left;

> Does perf_event_fsl_emb.c need this as well (it has almost the same
> record_and_restart code)?

I would think so.