[PATCH 2/3] perf tools: Add readable output for callchain debug

[Jiri Olsa <jolsa@redhat.com>]

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
  ...

Tested-Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
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>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/builtin-record.c | 4 +++-
 tools/perf/perf.h           | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 2d00a19..04c5cf9 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -770,7 +770,9 @@ int record_parse_callchain(const char *arg, struct perf_record_opts *opts)
 
 static void callchain_debug(struct perf_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 27223fb..313a5df 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -207,7 +207,8 @@ void pthread__unblock_sigwinch(void);
 enum perf_call_graph_mode {
 	CALLCHAIN_NONE,
 	CALLCHAIN_FP,
-	CALLCHAIN_DWARF
+	CALLCHAIN_DWARF,
+	CALLCHAIN_MAX
 };
 
 struct perf_record_opts {
-- 
1.7.11.7