[PATCH 2/3] perf tools: Add option to skip ignore symbol when printing callchains

[Namhyung Kim <namhyung@kernel.org>]

For tracepoint events, callchains always contain certain functions.
Sometimes it'd be better to skip those functions as they have no value.

Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/builtin-sched.c      | 3 ++-
 tools/perf/util/evsel.h         | 1 +
 tools/perf/util/evsel_fprintf.c | 7 ++++++-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index cd14189d3943..06be809a02ab 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1876,7 +1876,8 @@ static void timehist_print_sample(struct perf_sched *sched,
 
 	sample__fprintf_sym(sample, al, 0,
 			    EVSEL__PRINT_SYM | EVSEL__PRINT_ONELINE |
-			    EVSEL__PRINT_CALLCHAIN_ARROW,
+			    EVSEL__PRINT_CALLCHAIN_ARROW |
+			    EVSEL__PRINT_SKIP_IGNORED,
 			    &callchain_cursor, stdout);
 
 out:
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 27fa3a343577..6abb89cd27f9 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -392,6 +392,7 @@ int perf_evsel__fprintf(struct perf_evsel *evsel,
 #define EVSEL__PRINT_SRCLINE		(1<<5)
 #define EVSEL__PRINT_UNKNOWN_AS_ADDR	(1<<6)
 #define EVSEL__PRINT_CALLCHAIN_ARROW	(1<<7)
+#define EVSEL__PRINT_SKIP_IGNORED	(1<<8)
 
 struct callchain_cursor;
 
diff --git a/tools/perf/util/evsel_fprintf.c b/tools/perf/util/evsel_fprintf.c
index 53bb614feafb..5a6f52284452 100644
--- a/tools/perf/util/evsel_fprintf.c
+++ b/tools/perf/util/evsel_fprintf.c
@@ -109,6 +109,7 @@ int sample__fprintf_callchain(struct perf_sample *sample, int left_alignment,
 	int print_srcline = print_opts & EVSEL__PRINT_SRCLINE;
 	int print_unknown_as_addr = print_opts & EVSEL__PRINT_UNKNOWN_AS_ADDR;
 	int print_arrow = print_opts & EVSEL__PRINT_CALLCHAIN_ARROW;
+	int print_skip_ignored = print_opts & EVSEL__PRINT_SKIP_IGNORED;
 	char s = print_oneline ? ' ' : '\t';
 	bool first = true;
 
@@ -124,6 +125,9 @@ int sample__fprintf_callchain(struct perf_sample *sample, int left_alignment,
 			if (!node)
 				break;
 
+			if (node->sym && node->sym->ignore && print_skip_ignored)
+				goto next;
+
 			printed += fprintf(fp, "%-*.*s", left_alignment, left_alignment, " ");
 
 			if (print_arrow && !first)
@@ -162,8 +166,9 @@ int sample__fprintf_callchain(struct perf_sample *sample, int left_alignment,
 			if (!print_oneline)
 				printed += fprintf(fp, "\n");
 
-			callchain_cursor_advance(cursor);
 			first = false;
+next:
+			callchain_cursor_advance(cursor);
 		}
 	}
 
-- 
2.10.0