Hi Peter,
On Wed, 2015-08-26 at 16:32 +0200, Peter Zijlstra wrote:
> On Wed, Aug 26, 2015 at 01:21:08PM +0000, Alexey Brodkin wrote:
> > Hi Peter,
> >
> > On Wed, 2015-08-26 at 15:12 +0200, Peter Zijlstra wrote:
> > > On Mon, Aug 24, 2015 at 05:20:20PM +0300, Alexey Brodkin wrote:
> > > > @@ -295,6 +317,16 @@ static int arc_pmu_add(struct perf_event *event,
> > > > int flags)
> > > > }
> > > >
> > > > write_aux_reg(ARC_REG_PCT_INDEX, idx);
> > > > +
> > > > + arc_pmu->act_counter[idx] = event;
> > > > +
> > > > + if (is_sampling_event(event)) {
> > > > + /* Mimic full counter overflow as other arches do */
> > > > + write_aux_reg(ARC_REG_PCT_INT_CNTL,
> > > > (u32)arc_pmu->max_period);
> > > > + write_aux_reg(ARC_REG_PCT_INT_CNTH,
> > > > + (arc_pmu->max_period >> 32));
> > > > + }
> > > > +
> > >
> > > pmu::add should call pmu::start when PERF_EF_START, without that it
> > > should not start the counter, only schedule it.
> > >
> > > (although currently all pmu::add() calls will have EF_START set)
> >
> > And that's what we do, don't we?
> > ----------------------->8-----------------------
> > if (flags & PERF_EF_START)
> > arc_pmu_start(event, PERF_EF_RELOAD);
> > ----------------------->8-----------------------
> >
>
> D'uh indeed! I read that above as enabling it, while what it really does
> it simply program the interrupt thresholds.
That's ok.
So do I need to do anything now or both your initial comments today are no
longer valid?
-Alexey--
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