1 files changed, 27 insertions, 6 deletions

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index dd277897ff0b..24cca0a7ffa3 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -710,12 +710,16 @@ int hist_entry__snprintf(struct hist_entry *self, char *s, size_t size,
         return ret;
 }
 
-int hist_entry__fprintf(struct hist_entry *self, struct hists *hists,
+int hist_entry__fprintf(struct hist_entry *he, size_t size, struct hists *hists,
                         struct hists *pair_hists, bool show_displacement,
                         long displacement, FILE *fp, u64 session_total)
 {
         char bf[512];
-        hist_entry__snprintf(self, bf, sizeof(bf), hists, pair_hists,
+
+        if (size == 0 || size > sizeof(bf))
+                size = sizeof(bf);
+
+        hist_entry__snprintf(he, bf, size, hists, pair_hists,
                              show_displacement, displacement,
                              true, session_total);
         return fprintf(fp, "%s\n", bf);
@@ -739,7 +743,8 @@ static size_t hist_entry__fprintf_callchain(struct hist_entry *self,
 }
 
 size_t hists__fprintf(struct hists *hists, struct hists *pair,
-                      bool show_displacement, FILE *fp)
+                      bool show_displacement, bool show_header, int max_rows,
+                      int max_cols, FILE *fp)
 {
         struct sort_entry *se;
         struct rb_node *nd;
@@ -749,9 +754,13 @@ size_t hists__fprintf(struct hists *hists, struct hists *pair,
         unsigned int width;
         const char *sep = symbol_conf.field_sep;
         const char *col_width = symbol_conf.col_width_list_str;
+        int nr_rows = 0;
 
         init_rem_hits();
 
+        if (!show_header)
+                goto print_entries;
+
         fprintf(fp, "# %s", pair ? "Baseline" : "Overhead");
 
         if (symbol_conf.show_nr_samples) {
@@ -814,7 +823,10 @@ size_t hists__fprintf(struct hists *hists, struct hists *pair,
                         width = hists__col_len(hists, se->se_width_idx);
                 fprintf(fp, "  %*s", width, se->se_header);
         }
+
         fprintf(fp, "\n");
+        if (max_rows && ++nr_rows >= max_rows)
+                goto out;
 
         if (sep)
                 goto print_entries;
@@ -841,7 +853,13 @@ size_t hists__fprintf(struct hists *hists, struct hists *pair,
                         fprintf(fp, ".");
         }
 
-        fprintf(fp, "\n#\n");
+        fprintf(fp, "\n");
+        if (max_rows && ++nr_rows >= max_rows)
+                goto out;
+
+        fprintf(fp, "#\n");
+        if (max_rows && ++nr_rows >= max_rows)
+                goto out;
 
 print_entries:
         for (nd = rb_first(&hists->entries); nd; nd = rb_next(nd)) {
@@ -858,19 +876,22 @@ print_entries:
                                 displacement = 0;
                         ++position;
                 }
-                ret += hist_entry__fprintf(h, hists, pair, show_displacement,
+                ret += hist_entry__fprintf(h, max_cols, hists, pair, show_displacement,
                                            displacement, fp, hists->stats.total_period);
 
                 if (symbol_conf.use_callchain)
                         ret += hist_entry__fprintf_callchain(h, hists, fp,
                                                              hists->stats.total_period);
+                if (max_rows && ++nr_rows >= max_rows)
+                        goto out;
+
                 if (h->ms.map == NULL && verbose > 1) {
                         __map_groups__fprintf_maps(&h->thread->mg,
                                                    MAP__FUNCTION, verbose, fp);
                         fprintf(fp, "%.10s end\n", graph_dotted_line);
                 }
         }
-
+out:
         free(rem_sq_bracket);
 
         return ret;