perf trace: Fix show_arg_names not working for tp arg names

trace__fprintf_tp_fields() will always print arg names because when
implemented it is forced to print arg_names with:

  (1 || trace->show_arg_names)

So the printing looks like:

> cat ~/.perfconfig
    [trace]
        show_arg_names = no

> perf trace -e syscalls:*mmap sleep 1
    0.000 sleep/1119 syscalls:sys_enter_mmap(NULL, 8192, READ|WRITE, PRIVATE|ANONYMOUS)
    0.179 sleep/1119 syscalls:sys_exit_mmap(__syscall_nr: 9, ret: 140535426170880)
    ...

Although the comment said that perhaps we need a show_tp_arg_names.

I don't think it's necessary to control them separately because it's not
so clean that part of the log shows arg names but other not.

Also when we are tracing functions it's rare to especially distinguish
syscalls and tp trace.

Only use one option to control arg names printing is more resonable and
simple. So remove the force condition and commit.

After fix:

> perf trace -e syscalls:*mmap sleep 1
    0.000 sleep/1121 syscalls:sys_enter_mmap(NULL, 8192, READ|WRITE, PRIVATE|ANONYMOUS)
    0.163 sleep/1121 syscalls:sys_exit_mmap(9, 140454467661824)
    ...

Fixes: f11b2803bb88655d ("perf trace: Allow choosing how to augment the tracepoint arguments")
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20220926031440.28275-2-chenzhongjin@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 3ecc31375f90e4e69e254280d98a155e03505f41..99e23e6e6a67a7fb5cc1aa57260d52f02bea7f52 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2759,11 +2759,7 @@ static size_t trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel,
 
                printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");
 
-               /*
-                * XXX Perhaps we should have a show_tp_arg_names,
-                * leaving show_arg_names just for syscalls?
-                */
-               if (1 || trace->show_arg_names)
+               if (trace->show_arg_names)
                        printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);
 
                printed += syscall_arg_fmt__scnprintf_val(arg, bf + printed, size - printed, &syscall_arg, val);