perf trace: Add array of chars scnprintf beautifier

Needed for sched's traceoints prev/next comm, where, unlike with
syscalls, we are not dealing with an integer or pointer, but an array
straight out from the ring buffer.

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>
Link: https://lkml.kernel.org/n/tip-rlll7tmcqe1g4odtaifil5re@git.kernel.org
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 f30296c..b3fb208 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -91,6 +91,7 @@ struct syscall_arg_fmt {
        unsigned long (*mask_val)(struct syscall_arg *arg, unsigned long val);
        void       *parm;
        const char *name;
+       u16        nr_entries; // for arrays
        bool       show_zero;
 };
 
@@ -522,6 +523,16 @@ size_t syscall_arg__scnprintf_long(char *bf, size_t size, struct syscall_arg *ar
        return scnprintf(bf, size, "%ld", arg->val);
 }
 
+static size_t syscall_arg__scnprintf_char_array(char *bf, size_t size, struct syscall_arg *arg)
+{
+       // XXX Hey, maybe for sched:sched_switch prev/next comm fields we can
+       //     fill missing comms using thread__set_comm()...
+       //     here or in a special syscall_arg__scnprintf_pid_sched_tp...
+       return scnprintf(bf, size, "\"%-.*s\"", arg->fmt->nr_entries, arg->val);
+}
+
+#define SCA_CHAR_ARRAY syscall_arg__scnprintf_char_array
+
 static const char *bpf_cmd[] = {
        "MAP_CREATE", "MAP_LOOKUP_ELEM", "MAP_UPDATE_ELEM", "MAP_DELETE_ELEM",
        "MAP_GET_NEXT_KEY", "PROG_LOAD",
@@ -1491,7 +1502,10 @@ syscall_arg_fmt__init_array(struct syscall_arg_fmt *arg, struct tep_format_field
                        arg->scnprintf = SCA_PID;
                else if (strcmp(field->type, "umode_t") == 0)
                        arg->scnprintf = SCA_MODE_T;
-               else if ((strcmp(field->type, "int") == 0 ||
+               else if ((field->flags & TEP_FIELD_IS_ARRAY) && strstarts(field->type, "char")) {
+                       arg->scnprintf = SCA_CHAR_ARRAY;
+                       arg->nr_entries = field->arraylen;
+               } else if ((strcmp(field->type, "int") == 0 ||
                          strcmp(field->type, "unsigned int") == 0 ||
                          strcmp(field->type, "long") == 0) &&
                         len >= 2 && strcmp(field->name + len - 2, "fd") == 0) {