perf trace: Make the alignment of the syscall args be configurable

Since the start 'perf trace' aligns the parens enclosing the list of
syscall args to align the syscall results, allow this to be
configurable, keeping the default of 70. Using:

  # perf config
  llvm.dump-obj=true
  trace.add_events=/home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.o
  trace.show_zeros=yes
  trace.show_duration=no
  trace.no_inherit=yes
  trace.show_timestamp=no
  trace.show_arg_names=no
  trace.args_alignment=0
  # trace -e open*,close,*sleep sleep 1
  openat(CWD, /etc/ld.so.cache, CLOEXEC) = 3
  close(3) = 0
  openat(CWD, /lib64/libc.so.6, CLOEXEC) = 3
  close(3) = 0
  openat(CWD, /usr/lib/locale/locale-archive, CLOEXEC) = 3
  close(3) = 0
  nanosleep(0x7ffc00de66f0, 0) = 0
  close(1) = 0
  close(2) = 0
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-r8cbhoz1lr5npq9tutpvoigr@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-config.txt

@@ -529,6 +529,10 @@ trace.*::
 		activate the 'perf trace' logic that looks for syscall
 		pointer contents after the normal tracepoint payload.
 
+	trace.args_alignment::
+		Number of columns to align the argument list, default is 70,
+		use 40 for the strace default, zero to no alignment.
+
 	trace.no_inherit::
 		Do not follow children threads.
 

tools/perf/builtin-trace.c

@@ -127,6 +127,7 @@ struct trace {
 	bool			show_tool_stats;
 	bool			trace_syscalls;
 	bool			kernel_syscallchains;
+	s16			args_alignment;
 	bool			show_tstamp;
 	bool			show_duration;
 	bool			show_zeros;
@@ -1731,7 +1732,7 @@ static int trace__printf_interrupted_entry(struct trace *trace)
 		return 0;
 
 	printed  = trace__fprintf_entry_head(trace, trace->current, 0, false, ttrace->entry_time, trace->output);
-	printed += fprintf(trace->output, "%-70s) ...\n", ttrace->entry_str);
+	printed += fprintf(trace->output, "%-*s) ...\n", trace->args_alignment, ttrace->entry_str);
 	ttrace->entry_pending = false;
 
 	++trace->nr_events_printed;
@@ -1838,7 +1839,7 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
 	if (sc->is_exit) {
 		if (!(trace->duration_filter || trace->summary_only || trace->failure_only || trace->min_stack)) {
 			trace__fprintf_entry_head(trace, thread, 0, false, ttrace->entry_time, trace->output);
-			fprintf(trace->output, "%-70s)\n", ttrace->entry_str);
+			fprintf(trace->output, "%-*s)\n", trace->args_alignment, ttrace->entry_str);
 		}
 	} else {
 		ttrace->entry_pending = true;
@@ -1981,7 +1982,7 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
 	trace__fprintf_entry_head(trace, thread, duration, duration_calculated, ttrace->entry_time, trace->output);
 
 	if (ttrace->entry_pending) {
-		fprintf(trace->output, "%-70s", ttrace->entry_str);
+		fprintf(trace->output, "%-*s", trace->args_alignment, ttrace->entry_str);
 	} else {
 		fprintf(trace->output, " ... [");
 		color_fprintf(trace->output, PERF_COLOR_YELLOW, "continued");
@@ -3563,6 +3564,10 @@ static int trace__config(const char *var, const char *value, void *arg)
 		trace->show_zeros = new_show_zeros;
 	} else if (!strcmp(var, "trace.no_inherit")) {
 		trace->opts.no_inherit = perf_config_bool(var, value);
+	} else if (!strcmp(var, "trace.args_alignment")) {
+		int args_alignment = 0;
+		if (perf_config_int(&args_alignment, var, value) == 0)
+			trace->args_alignment = args_alignment;
 	}
 out:
 	return err;
@@ -3596,6 +3601,7 @@ int cmd_trace(int argc, const char **argv)
 		.show_tstamp = true,
 		.show_duration = true,
 		.show_arg_names = true,
+		.args_alignment = 70,
 		.trace_syscalls = false,
 		.kernel_syscallchains = false,
 		.max_stack = UINT_MAX,