Re: [PATCH bpf-next] selftests/bpf: scale benchmark counting by using per-CPU counters

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On Thu, Mar 14, 2024 at 8:56 PM Andrii Nakryiko
<andrii.nakryiko@xxxxxxxxx> wrote:
>
> On Thu, Mar 14, 2024 at 7:33 PM Alexei Starovoitov
> <alexei.starovoitov@xxxxxxxxx> wrote:
> >
> > On Tue, Mar 12, 2024 at 3:23 PM Andrii Nakryiko <andrii@xxxxxxxxxx> wrote:
> > >
> > >
> > >  static void trigger_base_measure(struct bench_res *res)
> > >  {
> > > -       res->hits = atomic_swap(&base_hits.value, 0);
> > > +       res->hits = sum_counters(base_hits);
> > >  }
> > >
> > >  static void *trigger_producer(void *input)
> > > @@ -42,7 +72,7 @@ static void *trigger_producer(void *input)
> > >
> > >  static void trigger_measure(struct bench_res *res)
> > >  {
> > > -       res->hits = atomic_swap(&ctx.skel->bss->hits, 0);
> > > +       res->hits = sum_counters(ctx.skel->bss->hits);
> > >  }
> >
> > It was zeroing counters before.
> > Do you need to zero them now?
> >
>
> sum_counters() does zero them out, it does the same atomic_swap(0).

I simply missed the swap in there.
Could you rename it to sum_and_zero_counters() or
something, so it's obvious?
A helper that says 'sum_counters' isn't expected to have such side effects.





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