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.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index 35108fd..0098eab 100644 (file)
--- a/tools/perf/Documentation/perf-config.txt
+++ b/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.
 

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 95dfcb8..2d8fd48 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/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,