perf hists: Allow limiting the number of rows and columns in fprintf

So that we can reuse hists__fprintf for in the new perf top tool.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-huazw48x05h8r9niz5cf63za@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index e821999..b39f3a1 100644 (file)
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -162,7 +162,7 @@ static int __cmd_diff(void)
 
        hists__match(&session[0]->hists, &session[1]->hists);
        hists__fprintf(&session[1]->hists, &session[0]->hists,
-                      show_displacement, stdout);
+                      show_displacement, true, 0, 0, stdout);
 out_delete:
        for (i = 0; i < 2; ++i)
                perf_session__delete(session[i]);

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 3d58334..b125742 100644 (file)
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -232,7 +232,7 @@ static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,
                const char *evname = event_name(pos);
 
                hists__fprintf_nr_sample_events(hists, evname, stdout);
-               hists__fprintf(hists, NULL, false, stdout);
+               hists__fprintf(hists, NULL, false, true, 0, 0, stdout);
                fprintf(stdout, "\n\n");
        }
 

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index dd27789..24cca0a 100644 (file)
--- 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;

diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 3beb97c..861ffc3 100644 (file)
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -57,9 +57,9 @@ struct hist_entry *__hists__add_entry(struct hists *self,
                                      struct symbol *parent, u64 period);
 extern int64_t hist_entry__cmp(struct hist_entry *, struct hist_entry *);
 extern int64_t hist_entry__collapse(struct hist_entry *, struct hist_entry *);
-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 total);
+                       long displacement, FILE *fp, u64 session_total);
 int hist_entry__snprintf(struct hist_entry *self, char *bf, size_t size,
                         struct hists *hists, struct hists *pair_hists,
                         bool show_displacement, long displacement,
@@ -73,7 +73,8 @@ void hists__inc_nr_events(struct hists *self, u32 type);
 size_t hists__fprintf_nr_events(struct hists *self, FILE *fp);
 
 size_t hists__fprintf(struct hists *self, struct hists *pair,
-                     bool show_displacement, FILE *fp);
+                     bool show_displacement, bool show_header,
+                     int max_rows, int max_cols, FILE *fp);
 
 int hist_entry__inc_addr_samples(struct hist_entry *self, int evidx, u64 addr);
 int hist_entry__annotate(struct hist_entry *self, size_t privsize);