linux-kernel - Re: [PATCH v2 perf,bpf 09/11] perf-top: add option --bpf-event

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Date:   Fri, 15 Feb 2019 12:27:49 -0200
From:   Arnaldo Carvalho de Melo <acme@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        ast@...nel.org, daniel@...earbox.net, kernel-team@...com,
        peterz@...radead.org, jolsa@...nel.org, namhyung@...nel.org
Subject: Re: [PATCH v2 perf,bpf 09/11] perf-top: add option --bpf-event

Em Thu, Feb 14, 2019 at 04:00:10PM -0800, Song Liu escreveu:
> bpf events are only tracked when opts->bpf_event is enabled. This patch
> adds command line flag to enable this for perf-top.

Shouldn't this start as enabled and we just provide a way to disable it
for testing purposes? Normally perf top works system wide, and then we
want to get info about BPF events, I think.

- Arnaldo
 
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  tools/perf/builtin-top.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index 27d8d42e0a4d..5271d7211b9c 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -1492,6 +1492,7 @@ int cmd_top(int argc, const char **argv)
>  		    "Display raw encoding of assembly instructions (default)"),
>  	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
>  		    "Enable kernel symbol demangling"),
> +	OPT_BOOLEAN(0, "bpf-event", &opts->bpf_event, "record bpf events"),
>  	OPT_STRING(0, "objdump", &top.annotation_opts.objdump_path, "path",
>  		    "objdump binary to use for disassembly and annotations"),
>  	OPT_STRING('M', "disassembler-style", &top.annotation_opts.disassembler_style, "disassembler style",
> -- 
> 2.17.1