perf script: Switch from perf.data's kallsyms to perf's symbol resolver

We were storing a copy of kallsyms inside perf.data file so that we
could resolve kernel addresses to function (start, name, mod) tuples,
but that can be achieved using the symbol resolving routines we have
in symbols.c, and that are used elsewhere in tools/perf.

So, do just like 'perf trace' did and ask libtraceevent to use perf's
symbol resolution routines.

The next step is to just skip whatever kallsyms data is embedded in
older perf.data files and finally to stop storing kallsyms in the perf
data file, as the 20-bytes build-id stored in perf.data's header is
enough to find out the right symtab (be it ELF, kcore, kallsyms, etc) to
use.

Acked-by: David Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/n/tip-d0rtb8tk9j72pz0ehw5fnp24@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 24809787369f5a1303451de5264798d0e31792b6..2777c6444bc3604fded8e241a392e1a3933785e2 100644 (file)
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1830,6 +1830,13 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
        else
                symbol_conf.use_callchain = false;
 
+       if (pevent_set_function_resolver(session->tevent.pevent,
+                                        machine__resolve_kernel_addr,
+                                        &session->machines.host) < 0) {
+               pr_err("%s: failed to set libtraceevent function resolver\n", __func__);
+               return -1;
+       }
+
        if (generate_script_lang) {
                struct stat perf_stat;
                int input;