perf trace: Allow suppressing the syscall argument names

To show just the values:

Default:

  # trace -e open*,close,*sleep sleep 1
  openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC           ) = 3
  close(fd: 3                                                           ) = 0
  openat(dfd: CWD, filename: /lib64/libc.so.6, flags: CLOEXEC           ) = 3
  close(fd: 3                                                           ) = 0
  openat(dfd: CWD, filename: /usr/lib/locale/locale-archive, flags: CLOEXEC) = 3
  close(fd: 3                                                           ) = 0
  nanosleep(rqtp: 0x7ffc0c4ea0d0, rmtp: 0                               ) = 0
  close(fd: 1                                                           ) = 0
  close(fd: 2                                                           ) = 0
  #

Remove it:

  # perf config trace.show_arg_names=no
  # 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(0x7ffced3a8c40, 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-ta9tbdwgodpw719sr2bjm8eb@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 ecd1e95..35108fd 100644 (file)
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -532,6 +532,10 @@ trace.*::
        trace.no_inherit::
                Do not follow children threads.
 
+       trace.show_arg_names::
+               Should syscall argument names be printed? If not then trace.show_zeros
+               will be set.
+
        trace.show_duration::
                Show syscall duration.
 

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index e978ce0..95dfcb8 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -130,6 +130,7 @@ struct trace {
        bool                    show_tstamp;
        bool                    show_duration;
        bool                    show_zeros;
+       bool                    show_arg_names;
        bool                    force;
        bool                    vfs_getname;
        int                     trace_pgfaults;
@@ -1613,8 +1614,11 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
                              sc->arg_fmt[arg.idx].parm))
                                continue;
 
-                       printed += scnprintf(bf + printed, size - printed,
-                                            "%s%s: ", printed ? ", " : "", field->name);
+                       printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");
+
+                       if (trace->show_arg_names)
+                               printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);
+
                        printed += syscall__scnprintf_val(sc, bf + printed, size - printed, &arg, val);
                }
        } else if (IS_ERR(sc->tp_format)) {
@@ -3546,12 +3550,21 @@ static int trace__config(const char *var, const char *value, void *arg)
                trace->show_tstamp = perf_config_bool(var, value);
        } else if (!strcmp(var, "trace.show_duration")) {
                trace->show_duration = perf_config_bool(var, value);
+       } else if (!strcmp(var, "trace.show_arg_names")) {
+               trace->show_arg_names = perf_config_bool(var, value);
+               if (!trace->show_arg_names)
+                       trace->show_zeros = true;
        } else if (!strcmp(var, "trace.show_zeros")) {
-               trace->show_zeros = perf_config_bool(var, value);
+               bool new_show_zeros = perf_config_bool(var, value);
+               if (!trace->show_arg_names && !new_show_zeros) {
+                       pr_warning("trace.show_zeros has to be set when trace.show_arg_names=no\n");
+                       goto out;
+               }
+               trace->show_zeros = new_show_zeros;
        } else if (!strcmp(var, "trace.no_inherit")) {
                trace->opts.no_inherit = perf_config_bool(var, value);
        }
-
+out:
        return err;
 }
 
@@ -3582,6 +3595,7 @@ int cmd_trace(int argc, const char **argv)
                .show_comm = true,
                .show_tstamp = true,
                .show_duration = true,
+               .show_arg_names = true,
                .trace_syscalls = false,
                .kernel_syscallchains = false,
                .max_stack = UINT_MAX,