perf record: Add readable output for callchain debug

Adding people readable output for callchain debug, to get following '-v'
output:

  $ perf record -v -g ls
  callchain: type DWARF
  callchain: stack dump size 4096
  ...

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1391427883-13443-3-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 5 insertions, 2 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index be9e8bc0c4aa..7b8f0e6068b3 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -735,7 +735,9 @@ int record_parse_callchain(const char *arg, struct record_opts *opts)
 
 static void callchain_debug(struct record_opts *opts)
 {
-        pr_debug("callchain: type %d\n", opts->call_graph);
+        static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF" };
+
+        pr_debug("callchain: type %s\n", str[opts->call_graph]);
 
         if (opts->call_graph == CALLCHAIN_DWARF)
                 pr_debug("callchain: stack dump size %d\n",
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 2078f334617c..6898ad0e199f 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -251,7 +251,8 @@ void pthread__unblock_sigwinch(void);
 enum perf_call_graph_mode {
         CALLCHAIN_NONE,
         CALLCHAIN_FP,
-        CALLCHAIN_DWARF
+        CALLCHAIN_DWARF,
+        CALLCHAIN_MAX
 };
 
 struct record_opts {