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

From: Namhyung Kim
Date: Wed Nov 23 2016 - 20:11:37 EST


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@xxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
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