linux-kernel - Re: [PATCH v4 12/53] perf bpf: Don't synthesize BPF events when disabled

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Date:   Wed, 8 Nov 2023 15:03:15 -0800
From:   Song Liu <song@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>, Song Liu <songliubraving@...com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nick Terrell <terrelln@...com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        "Steinar H. Gunderson" <sesse@...gle.com>,
        Liam Howlett <liam.howlett@...cle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Colin Ian King <colin.i.king@...il.com>,
        Dmitrii Dolgov <9erthalion6@...il.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Ming Wang <wangming01@...ngson.cn>,
        James Clark <james.clark@....com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Leo Yan <leo.yan@...aro.org>,
        Ravi Bangoria <ravi.bangoria@....com>,
        German Gomez <german.gomez@....com>,
        Changbin Du <changbin.du@...wei.com>,
        Paolo Bonzini <pbonzini@...hat.com>, Li Dong <lidong@...o.com>,
        Sandipan Das <sandipan.das@....com>,
        liuwenyu <liuwenyu7@...wei.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v4 12/53] perf bpf: Don't synthesize BPF events when disabled

On Wed, Nov 8, 2023 at 8:15 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> Em Thu, Nov 02, 2023 at 10:56:54AM -0700, Ian Rogers escreveu:
> > If BPF sideband events are disabled on the command line, don't
> > synthesize BPF events too.
>
>
> Interesting, in 71184c6ab7e60fd5 ("perf record: Replace option
> --bpf-event with --no-bpf-event") we checked that, but only down at
> perf_event__synthesize_one_bpf_prog(), where we have:
>
>         if (!opts->no_bpf_event) {
>                 /* Synthesize PERF_RECORD_BPF_EVENT */
>                 *bpf_event = (struct perf_record_bpf_event)
>
>
> So we better remove that, now redundant check? I'll apply your patch as
> is and then we can remove that other check.
>
> Song, can I have your Acked-by or Reviewed-by, please?
>
> - Arnaldo
>
> > Signed-off-by: Ian Rogers <irogers@...gle.com>

Good catch!

Acked-by: Song Liu <song@...nel.org>