perf hists: Add hists__filter_by_symbol

This function will be used for simple (sub-)string matching filter based
on user input.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1331887855-874-1-git-send-email-namhyung.kim@lge.com
Signed-off-by: Namhyung Kim <namhyung.kim@lge.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 37 insertions, 0 deletions

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 8380c3db1c9..2c624ad371a 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -10,11 +10,14 @@ static bool hists__filter_entry_by_dso(struct hists *hists,
                                        struct hist_entry *he);
 static bool hists__filter_entry_by_thread(struct hists *hists,
                                           struct hist_entry *he);
+static bool hists__filter_entry_by_symbol(struct hists *hists,
+                                          struct hist_entry *he);
 
 enum hist_filter {
         HIST_FILTER__DSO,
         HIST_FILTER__THREAD,
         HIST_FILTER__PARENT,
+        HIST_FILTER__SYMBOL,
 };
 
 struct callchain_param  callchain_param = {
@@ -420,6 +423,7 @@ static void hists__apply_filters(struct hists *hists, struct hist_entry *he)
 {
         hists__filter_entry_by_dso(hists, he);
         hists__filter_entry_by_thread(hists, he);
+        hists__filter_entry_by_symbol(hists, he);
 }
 
 static void __hists__collapse_resort(struct hists *hists, bool threaded)
@@ -1247,6 +1251,37 @@ void hists__filter_by_thread(struct hists *hists)
         }
 }
 
+static bool hists__filter_entry_by_symbol(struct hists *hists,
+                                          struct hist_entry *he)
+{
+        if (hists->symbol_filter_str != NULL &&
+            (!he->ms.sym || strstr(he->ms.sym->name,
+                                   hists->symbol_filter_str) == NULL)) {
+                he->filtered |= (1 << HIST_FILTER__SYMBOL);
+                return true;
+        }
+
+        return false;
+}
+
+void hists__filter_by_symbol(struct hists *hists)
+{
+        struct rb_node *nd;
+
+        hists->nr_entries = hists->stats.total_period = 0;
+        hists->stats.nr_events[PERF_RECORD_SAMPLE] = 0;
+        hists__reset_col_len(hists);
+
+        for (nd = rb_first(&hists->entries); nd; nd = rb_next(nd)) {
+                struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
+
+                if (hists__filter_entry_by_symbol(hists, h))
+                        continue;
+
+                hists__remove_entry_filter(hists, h, HIST_FILTER__SYMBOL);
+        }
+}
+
 int hist_entry__inc_addr_samples(struct hist_entry *he, int evidx, u64 ip)
 {
         return symbol__inc_addr_samples(he->ms.sym, he->ms.map, evidx, ip);
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 9413f3e31fe..10343c081e1 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -62,6 +62,7 @@ struct hists {
         const struct thread     *thread_filter;
         const struct dso        *dso_filter;
         const char              *uid_filter_str;
+        const char              *symbol_filter_str;
         pthread_mutex_t         lock;
         struct events_stats     stats;
         u64                     event_stream;
@@ -107,6 +108,7 @@ int hist_entry__annotate(struct hist_entry *self, size_t privsize);
 
 void hists__filter_by_dso(struct hists *hists);
 void hists__filter_by_thread(struct hists *hists);
+void hists__filter_by_symbol(struct hists *hists);
 
 u16 hists__col_len(struct hists *self, enum hist_column col);
 void hists__set_col_len(struct hists *self, enum hist_column col, u16 len);