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

[Song Liu]

> On Feb 15, 2019, at 6:27 AM, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:
> 
> 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

We can enable it by default, and add a --no-bpf-event option to disable it
for testing. 

Thanks,
Song



>> Signed-off-by: Song Liu <songliubraving@xxxxxx>
>> ---
>> 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