perf callchain: Add option to skip ignore symbol when printing callchains

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

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20161124011114.7102-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 9 insertions, 2 deletions

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 829468defa07..43fcc13e402d 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);
                 }
         }