netdev - Re: [PATCH bpf-next v8 11/11] selftests: Remove fmod_ret from benchmarks and test

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Date:   Wed, 23 Sep 2020 18:38:01 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>,
        KP Singh <kpsingh@...omium.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next v8 11/11] selftests: Remove fmod_ret from
 benchmarks and test_overhead

On Wed, Sep 23, 2020 at 6:08 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Tue, Sep 22, 2020 at 08:38:45PM +0200, Toke Høiland-Jørgensen wrote:
> > -const struct bench bench_trig_fmodret = {
> > -     .name = "trig-fmodret",
> > -     .validate = trigger_validate,
> > -     .setup = trigger_fmodret_setup,
> > -     .producer_thread = trigger_producer,
> > -     .consumer_thread = trigger_consumer,
> > -     .measure = trigger_measure,
> > -     .report_progress = hits_drops_report_progress,
> > -     .report_final = hits_drops_report_final,
> > -};
> > diff --git a/tools/testing/selftests/bpf/progs/trigger_bench.c b/tools/testing/selftests/bpf/progs/trigger_bench.c
> > index 9a4d09590b3d..1af23ac0c37c 100644
> > --- a/tools/testing/selftests/bpf/progs/trigger_bench.c
> > +++ b/tools/testing/selftests/bpf/progs/trigger_bench.c
> > @@ -45,10 +45,3 @@ int bench_trigger_fentry_sleep(void *ctx)
> >       __sync_add_and_fetch(&hits, 1);
> >       return 0;
> >  }
> > -
> > -SEC("fmod_ret/__x64_sys_getpgid")
> > -int bench_trigger_fmodret(void *ctx)
> > -{
> > -     __sync_add_and_fetch(&hits, 1);
> > -     return -22;
> > -}
>
> why are you removing this? There is no problem here.
> All syscalls are error-injectable.
> I'm surprised Andrii acked this :(

Andrii didn't know that all syscalls are error-injectable, thanks for
catching :) after fmod_ret/__set_task_comm I just assumed that I've
been abusing fmod_ret all this time...