3 files changed, 40 insertions, 6 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 4b0e15c2b2a8..87a6615a40fa 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -276,11 +276,17 @@ static void perf_top__print_sym_table(struct perf_top *top)
                 return;
         }
 
+        if (top->zero) {
+                hists__delete_entries(&top->sym_evsel->hists);
+        } else {
+                hists__decay_entries(&top->sym_evsel->hists,
+                                     top->hide_user_symbols,
+                                     top->hide_kernel_symbols);
+        }
+
         hists__collapse_resort(&top->sym_evsel->hists, NULL);
         hists__output_resort(&top->sym_evsel->hists);
-        hists__decay_entries(&top->sym_evsel->hists,
-                             top->hide_user_symbols,
-                             top->hide_kernel_symbols);
+
         hists__output_recalc_col_len(&top->sym_evsel->hists,
                                      top->print_entries - printed);
         putchar('\n');
@@ -542,11 +548,16 @@ static void perf_top__sort_new_samples(void *arg)
         if (t->evlist->selected != NULL)
                 t->sym_evsel = t->evlist->selected;
 
+        if (t->zero) {
+                hists__delete_entries(&t->sym_evsel->hists);
+        } else {
+                hists__decay_entries(&t->sym_evsel->hists,
+                                     t->hide_user_symbols,
+                                     t->hide_kernel_symbols);
+        }
+
         hists__collapse_resort(&t->sym_evsel->hists, NULL);
         hists__output_resort(&t->sym_evsel->hists);
-        hists__decay_entries(&t->sym_evsel->hists,
-                             t->hide_user_symbols,
-                             t->hide_kernel_symbols);
 }
 
 static void *display_thread_tui(void *arg)
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 30df6187ee02..86569fa3651d 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -277,6 +277,28 @@ void hists__decay_entries(struct hists *hists, bool zap_user, bool zap_kernel)
         }
 }
 
+void hists__delete_entries(struct hists *hists)
+{
+        struct rb_node *next = rb_first(&hists->entries);
+        struct hist_entry *n;
+
+        while (next) {
+                n = rb_entry(next, struct hist_entry, rb_node);
+                next = rb_next(&n->rb_node);
+
+                rb_erase(&n->rb_node, &hists->entries);
+
+                if (sort__need_collapse)
+                        rb_erase(&n->rb_node_in, &hists->entries_collapsed);
+
+                --hists->nr_entries;
+                if (!n->filtered)
+                        --hists->nr_non_filtered_entries;
+
+                hist_entry__free(n);
+        }
+}
+
 /*
  * histogram, sorted on item, collects periods
  */
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 95405a8fbd95..8c9c70e18cbb 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -152,6 +152,7 @@ void hists__output_resort(struct hists *hists);
 void hists__collapse_resort(struct hists *hists, struct ui_progress *prog);
 
 void hists__decay_entries(struct hists *hists, bool zap_user, bool zap_kernel);
+void hists__delete_entries(struct hists *hists);
 void hists__output_recalc_col_len(struct hists *hists, int max_rows);
 
 u64 hists__total_period(struct hists *hists);