perf diff: Fix support for all --sort combinations

When we finish creating the hist_entries we _already_ have them
sorted "by name", in fact by what is in --sort, that is exactly
how we can find the pairs in perf_session__match_hists as
'comm', 'dso' & 'symbol' all are strings we need to find the
matches in the baseline session.

So only do the sort by hits followed by a resort by --sort if we
need to find the position for shwowing the --displacement of
hist entries.

Now all these modes work correctly:

Example is a simple 'perf record -f find / > /dev/null' ran
twice then followed by the following commands:

  $ perf diff -f --sort comm
  # Baseline  Delta      Command
  # ........ ..........  .......
  #
       0.00%   +100.00%     find
  $ perf diff -f --sort dso
  # Baseline  Delta           Shared Object
  # ........ ..........  ..................
  #
      59.97%     -0.44%  [kernel]
      21.17%     +0.28%  libc-2.5.so
      18.49%     +0.16%  [ext3]
       0.37%             find
  $ perf diff -f --sort symbol | head -8
  # Baseline  Delta      Symbol
  # ........ ..........  ......
  #
       6.21%     +0.36%  [k] ext3fs_dirhash
       3.43%     +0.41%  [.] __GI_strlen
       3.53%     +0.16%  [k] __kmalloc
       3.17%     +0.49%  [k] system_call
       3.06%     +0.37%  [k] ext3_htree_store_dirent
  $ perf diff -f --sort dso,symbol | head -8
  # Baseline  Delta           Shared Object  Symbol
  # ........ ..........  ..................  ......
  #
       6.21%     +0.36%  [ext3]              [k] ext3fs_dirhash
       3.43%     +0.41%  libc-2.5.so         [.] __GI_strlen
       3.53%     +0.16%  [kernel]            [k] __kmalloc
       3.17%     +0.49%  [kernel]            [k] system_call
       3.06%     +0.37%  [ext3]              [k] ext3_htree_store_dirent
  $

And we don't have to do two expensive resorts in the common, non
--displacement case.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1262047716-23171-5-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 21 insertions, 31 deletions

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 876a4b981be8..924bfb77a6ab 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -82,29 +82,19 @@ static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
         struct hist_entry *iter;
 
         while (*p != NULL) {
-                int cmp;
                 parent = *p;
                 iter = rb_entry(parent, struct hist_entry, rb_node);
-
-                cmp = strcmp(he->map->dso->name, iter->map->dso->name);
-                if (cmp > 0)
+                if (hist_entry__cmp(he, iter) < 0)
                         p = &(*p)->rb_left;
-                else if (cmp < 0)
+                else
                         p = &(*p)->rb_right;
-                else {
-                        cmp = strcmp(he->sym->name, iter->sym->name);
-                        if (cmp > 0)
-                                p = &(*p)->rb_left;
-                        else
-                                p = &(*p)->rb_right;
-                }
         }
 
         rb_link_node(&he->rb_node, parent, p);
         rb_insert_color(&he->rb_node, root);
 }
 
-static void perf_session__resort_by_name(struct perf_session *self)
+static void perf_session__resort_hist_entries(struct perf_session *self)
 {
         unsigned long position = 1;
         struct rb_root tmp = RB_ROOT;
@@ -122,29 +112,28 @@ static void perf_session__resort_by_name(struct perf_session *self)
         self->hists = tmp;
 }
 
+static void perf_session__set_hist_entries_positions(struct perf_session *self)
+{
+        perf_session__output_resort(self, self->events_stats.total);
+        perf_session__resort_hist_entries(self);
+}
+
 static struct hist_entry *
-perf_session__find_hist_entry_by_name(struct perf_session *self,
-                                      struct hist_entry *he)
+perf_session__find_hist_entry(struct perf_session *self,
+                              struct hist_entry *he)
 {
         struct rb_node *n = self->hists.rb_node;
 
         while (n) {
                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
-                int cmp = strcmp(he->map->dso->name, iter->map->dso->name);
+                int64_t cmp = hist_entry__cmp(he, iter);
 
-                if (cmp > 0)
+                if (cmp < 0)
                         n = n->rb_left;
-                else if (cmp < 0)
+                else if (cmp > 0)
                         n = n->rb_right;
-                else {
-                        cmp = strcmp(he->sym->name, iter->sym->name);
-                        if (cmp > 0)
-                                n = n->rb_left;
-                        else if (cmp < 0)
-                                n = n->rb_right;
-                        else
-                                return iter;
-                }
+                else 
+                        return iter;
         }
 
         return NULL;
@@ -155,11 +144,9 @@ static void perf_session__match_hists(struct perf_session *old_session,
 {
         struct rb_node *nd;
 
-        perf_session__resort_by_name(old_session);
-
         for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
                 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
-                pos->pair = perf_session__find_hist_entry_by_name(old_session, pos);
+                pos->pair = perf_session__find_hist_entry(old_session, pos);
         }
 }
 
@@ -177,9 +164,12 @@ static int __cmd_diff(void)
                 ret = perf_session__process_events(session[i], &event_ops);
                 if (ret)
                         goto out_delete;
-                perf_session__output_resort(session[i], session[i]->events_stats.total);
         }
 
+        perf_session__output_resort(session[1], session[1]->events_stats.total);
+        if (show_displacement)
+                perf_session__set_hist_entries_positions(session[0]);
+
         perf_session__match_hists(session[0], session[1]);
         perf_session__fprintf_hists(session[1], session[0],
                                     show_displacement, stdout);