perf report: Make the output more compact

When we filter by column content we may end up with a column
that has the same value for all the lines. So remove that
column and tell its unique value on the top, as a comment.

Example:

  [acme@doppio pahole]$  perf report --sort comm,dso,symbol -d ./build/libdwarves.so.1.0.0 -C pahole | head -15
  # dso: ./build/libdwarves.so.1.0.0
  # comm: pahole
  # Samples: 58409
  #
  # Overhead  Symbol
  # ........  ......
  #
      20.93%  [.] tag__recode_dwarf_type
      14.94%  [.] namespace__recode_dwarf_types
      10.38%  [.] cu__table_add_tag
       6.69%  [.] __die__process_tag
       5.05%  [.] die__process_function
       4.70%  [.] list__for_all_tags
       3.68%  [.] tag__init
       3.48%  [.] die__create_new_parameter
  [acme@doppio pahole]$

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1247325517-12272-3-git-send-email-acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 21 insertions, 15 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 617f4cb7f163..f3422121d858 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -583,6 +583,7 @@ struct sort_entry {
         int64_t (*collapse)(struct hist_entry *, struct hist_entry *);
         size_t  (*print)(FILE *fp, struct hist_entry *, unsigned int width);
         unsigned int *width;
+        bool    elide;
 };
 
 static int64_t cmp_null(void *l, void *r)
@@ -1024,7 +1025,7 @@ hist_entry__fprintf(FILE *fp, struct hist_entry *self, u64 total_samples)
                 ret = fprintf(fp, field_sep ? "%lld" : "%12lld ", self->count);
 
         list_for_each_entry(se, &hist_entry__sort_list, list) {
-                if (exclude_other && (se == &sort_parent))
+                if (se->elide)
                         continue;
 
                 fprintf(fp, "%s", field_sep ?: "  ");
@@ -1079,7 +1080,7 @@ resolve_symbol(struct thread *thread, struct map **mapp,
                  * with no symbol hit that has a name longer than
                  * the ones with symbols sampled.
                  */
-                if (!map->dso->slen_calculated)
+                if (!sort_dso.elide && !map->dso->slen_calculated)
                         dso__calc_col_width(map->dso);
 
                 if (mapp)
@@ -1356,14 +1357,12 @@ static size_t output__fprintf(FILE *fp, u64 total_samples)
         unsigned int width;
         char *col_width = col_width_list_str;
 
-        fprintf(fp, "\n");
-        fprintf(fp, "#\n");
-        fprintf(fp, "# (%Ld samples)\n", (u64)total_samples);
+        fprintf(fp, "# Samples: %Ld\n", (u64)total_samples);
         fprintf(fp, "#\n");
 
         fprintf(fp, "# Overhead");
         list_for_each_entry(se, &hist_entry__sort_list, list) {
-                if (exclude_other && (se == &sort_parent))
+                if (se->elide)
                         continue;
                 if (field_sep) {
                         fprintf(fp, "%c%s", *field_sep, se->header);
@@ -1392,7 +1391,7 @@ static size_t output__fprintf(FILE *fp, u64 total_samples)
         list_for_each_entry(se, &hist_entry__sort_list, list) {
                 unsigned int i;
 
-                if (exclude_other && (se == &sort_parent))
+                if (se->elide)
                         continue;
 
                 fprintf(fp, "  ");
@@ -2022,7 +2021,8 @@ static void setup_sorting(void)
 }
 
 static void setup_list(struct strlist **list, const char *list_str,
-                       const char *list_name)
+                       struct sort_entry *se, const char *list_name,
+                       FILE *fp)
 {
         if (list_str) {
                 *list = strlist__new(true, list_str);
@@ -2031,6 +2031,11 @@ static void setup_list(struct strlist **list, const char *list_str,
                                 list_name);
                         exit(129);
                 }
+                if (strlist__nr_entries(*list) == 1) {
+                        fprintf(fp, "# %s: %s\n", list_name,
+                                strlist__entry(*list, 0)->s);
+                        se->elide = true;
+                }
         }
 }
 
@@ -2044,9 +2049,10 @@ int cmd_report(int argc, const char **argv, const char *prefix __used)
 
         setup_sorting();
 
-        if (parent_pattern != default_parent_pattern)
+        if (parent_pattern != default_parent_pattern) {
                 sort_dimension__add("parent");
-        else
+                sort_parent.elide = 1;
+        } else
                 exclude_other = 0;
 
         /*
@@ -2055,9 +2061,11 @@ int cmd_report(int argc, const char **argv, const char *prefix __used)
         if (argc)
                 usage_with_options(report_usage, options);
 
-        setup_list(&dso_list, dso_list_str, "dso");
-        setup_list(&comm_list, comm_list_str, "comm");
-        setup_list(&sym_list, sym_list_str, "symbol");
+        setup_pager();
+
+        setup_list(&dso_list, dso_list_str, &sort_dso, "dso", stdout);
+        setup_list(&comm_list, comm_list_str, &sort_comm, "comm", stdout);
+        setup_list(&sym_list, sym_list_str, &sort_sym, "symbol", stdout);
 
         if (field_sep && *field_sep == '.') {
                 fputs("'.' is the only non valid --field-separator argument\n",
@@ -2065,7 +2073,5 @@ int cmd_report(int argc, const char **argv, const char *prefix __used)
                 exit(129);
         }
 
-        setup_pager();
-
         return __cmd_report();
 }