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 So do I need to do anything now or both your initial comments today are no longer valid?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-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/