perf hists: Exchange order of comparing items when collapsing hists

When comparing entries for collapsing put the given entry first, and
then the iterated entry.  This is not the case of hist_entry__cmp() when
called if given sort keys don't require collapsing.  So change the order
for the sake of consistency.  It will be required for matching and/or
linking multiple hist entries.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1355128197-18193-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 10 insertions, 4 deletions

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index b2e7d39f099b..4dda6f4dc618 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -285,7 +285,7 @@ static void insert_hist_entry_by_name(struct rb_root *root,
         while (*p != NULL) {
                 parent = *p;
                 iter = rb_entry(parent, struct hist_entry, rb_node);
-                if (hist_entry__cmp(he, iter) < 0)
+                if (hist_entry__cmp(iter, he) < 0)
                         p = &(*p)->rb_left;
                 else
                         p = &(*p)->rb_right;
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 82df1b26f0d4..3a9ccd09835d 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -285,7 +285,13 @@ static struct hist_entry *add_hist_entry(struct hists *hists,
                 parent = *p;
                 he = rb_entry(parent, struct hist_entry, rb_node_in);
 
-                cmp = hist_entry__cmp(entry, he);
+                /*
+                 * Make sure that it receives arguments in a same order as
+                 * hist_entry__collapse() so that we can use an appropriate
+                 * function when searching an entry regardless which sort
+                 * keys were used.
+                 */
+                cmp = hist_entry__cmp(he, entry);
 
                 if (!cmp) {
                         he_stat__add_period(&he->stat, period);
@@ -729,7 +735,7 @@ static struct hist_entry *hists__add_dummy_entry(struct hists *hists,
                 parent = *p;
                 he = rb_entry(parent, struct hist_entry, rb_node);
 
-                cmp = hist_entry__cmp(pair, he);
+                cmp = hist_entry__cmp(he, pair);
 
                 if (!cmp)
                         goto out;
@@ -759,7 +765,7 @@ static struct hist_entry *hists__find_entry(struct hists *hists,
 
         while (n) {
                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
-                int64_t cmp = hist_entry__cmp(he, iter);
+                int64_t cmp = hist_entry__cmp(iter, he);
 
                 if (cmp < 0)
                         n = n->rb_left;