perf evsel: Add option to limit stack depth in callchain dumps

Option is used by upcoming timehist command.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1375930261-77273-12-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 9 insertions, 5 deletions

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index ee5d6f8b7415..33b2d830eabd 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -402,7 +402,8 @@ static void print_sample_bts(union perf_event *event,
                 else
                         printf("\n");
                 perf_evsel__print_ip(evsel, event, sample, machine,
-                                     output[attr->type].print_ip_opts);
+                                     output[attr->type].print_ip_opts,
+                                     PERF_MAX_STACK_DEPTH);
         }
 
         printf(" => ");
@@ -444,7 +445,8 @@ static void process_event(union perf_event *event, struct perf_sample *sample,
                         printf("\n");
 
                 perf_evsel__print_ip(evsel, event, sample, machine,
-                                     output[attr->type].print_ip_opts);
+                                     output[attr->type].print_ip_opts,
+                                     PERF_MAX_STACK_DEPTH);
         }
 
         printf("\n");
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 0d895e7040e4..5a8996493d94 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1489,7 +1489,7 @@ struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
 
 void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
                           struct perf_sample *sample, struct machine *machine,
-                          unsigned int print_opts)
+                          unsigned int print_opts, unsigned int stack_depth)
 {
         struct addr_location al;
         struct callchain_cursor_node *node;
@@ -1517,7 +1517,7 @@ void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
                 }
                 callchain_cursor_commit(&callchain_cursor);
 
-                while (1) {
+                while (stack_depth) {
                         node = callchain_cursor_current(&callchain_cursor);
                         if (!node)
                                 break;
@@ -1544,6 +1544,8 @@ void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
                                 printf("\n");
 
                         callchain_cursor_advance(&callchain_cursor);
+
+                        stack_depth--;
                 }
 
         } else {
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 7c00ccb1173e..3aa75fb2225f 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -109,7 +109,7 @@ struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
 
 void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
                           struct perf_sample *sample, struct machine *machine,
-                          unsigned int print_opts);
+                          unsigned int print_opts, unsigned int stack_depth);
 
 int perf_session__cpu_bitmap(struct perf_session *session,
                              const char *cpu_list, unsigned long *cpu_bitmap);