[PATCH 2/4] perf hists: Link hist entries before inserting to an output tree

[Namhyung Kim]

From: Namhyung Kim <namhyung.kim@xxxxxxx>

For matching and/or linking hist entries, they need to be sorted by
given sort keys.  However current hists__match/link did this on the
output trees, so that the entries in the output tree need to be resort
before doing it.

This looks not so good since we have trees for collecting or
collapsing entries before passing them to an output tree and they're
already sorted by the given sort keys.  Since we don't need to print
anything at the time of matching/linking, we can use these internal
trees directly instead of bothering with double resort on the output
tree.

Its only user - at the time of this writing - perf diff can be easily
converted to use the internal tree and can save some lines too by
getting rid of unnecessary resorting codes.

Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/builtin-diff.c | 65 +++++++++++++----------------------------------
 tools/perf/util/hist.c    | 49 ++++++++++++++++++++++++++---------
 2 files changed, 54 insertions(+), 60 deletions(-)

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 4dda6f4dc618..8b896f5eded0 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -275,43 +275,6 @@ static struct perf_tool tool = {
 	.ordering_requires_timestamps = true,
 };
 
-static void insert_hist_entry_by_name(struct rb_root *root,
-				      struct hist_entry *he)
-{
-	struct rb_node **p = &root->rb_node;
-	struct rb_node *parent = NULL;
-	struct hist_entry *iter;
-
-	while (*p != NULL) {
-		parent = *p;
-		iter = rb_entry(parent, struct hist_entry, rb_node);
-		if (hist_entry__cmp(iter, he) < 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 hists__name_resort(struct hists *self)
-{
-	struct rb_root tmp = RB_ROOT;
-	struct rb_node *next = rb_first(&self->entries);
-
-	while (next != NULL) {
-		struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
-
-		next = rb_next(&n->rb_node);
-
-		rb_erase(&n->rb_node, &self->entries);
-		insert_hist_entry_by_name(&tmp, n);
-	}
-
-	self->entries = tmp;
-}
-
 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 				      struct perf_evlist *evlist)
 {
@@ -324,30 +287,34 @@ static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 	return NULL;
 }
 
-static void perf_evlist__resort_hists(struct perf_evlist *evlist, bool name)
+static void perf_evlist__collapse_resort(struct perf_evlist *evlist)
 {
 	struct perf_evsel *evsel;
 
 	list_for_each_entry(evsel, &evlist->entries, node) {
 		struct hists *hists = &evsel->hists;
 
-		hists__output_resort(hists);
-
-		if (name)
-			hists__name_resort(hists);
+		hists__collapse_resort(hists);
 	}
 }
 
 static void hists__baseline_only(struct hists *hists)
 {
-	struct rb_node *next = rb_first(&hists->entries);
+	struct rb_root *root;
+	struct rb_node *next;
+
+	if (sort__need_collapse)
+		root = &hists->entries_collapsed;
+	else
+		root = hists->entries_in;
 
+	next = rb_first(root);
 	while (next != NULL) {
-		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
+		struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in);
 
-		next = rb_next(&he->rb_node);
+		next = rb_next(&he->rb_node_in);
 		if (!hist_entry__next_pair(he)) {
-			rb_erase(&he->rb_node, &hists->entries);
+			rb_erase(&he->rb_node_in, root);
 			hist_entry__free(he);
 		}
 	}
@@ -471,6 +438,8 @@ static void hists__process(struct hists *old, struct hists *new)
 	else
 		hists__link(new, old);
 
+	hists__output_resort(new);
+
 	if (sort_compute) {
 		hists__precompute(new);
 		hists__compute_resort(new);
@@ -505,8 +474,8 @@ static int __cmd_diff(void)
 	evlist_old = older->evlist;
 	evlist_new = newer->evlist;
 
-	perf_evlist__resort_hists(evlist_old, true);
-	perf_evlist__resort_hists(evlist_new, false);
+	perf_evlist__collapse_resort(evlist_old);
+	perf_evlist__collapse_resort(evlist_new);
 
 	list_for_each_entry(evsel, &evlist_new->entries, node) {
 		struct perf_evsel *evsel_old;
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 3a9ccd09835d..8ff3c2f8a5dd 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -726,16 +726,24 @@ void hists__inc_nr_events(struct hists *hists, u32 type)
 static struct hist_entry *hists__add_dummy_entry(struct hists *hists,
 						 struct hist_entry *pair)
 {
-	struct rb_node **p = &hists->entries.rb_node;
+	struct rb_root *root;
+	struct rb_node **p;
 	struct rb_node *parent = NULL;
 	struct hist_entry *he;
 	int cmp;
 
+	if (sort__need_collapse)
+		root = &hists->entries_collapsed;
+	else
+		root = hists->entries_in;
+
+	p = &root->rb_node;
+
 	while (*p != NULL) {
 		parent = *p;
-		he = rb_entry(parent, struct hist_entry, rb_node);
+		he = rb_entry(parent, struct hist_entry, rb_node_in);
 
-		cmp = hist_entry__cmp(he, pair);
+		cmp = hist_entry__collapse(he, pair);
 
 		if (!cmp)
 			goto out;
@@ -750,8 +758,8 @@ static struct hist_entry *hists__add_dummy_entry(struct hists *hists,
 	if (he) {
 		memset(&he->stat, 0, sizeof(he->stat));
 		he->hists = hists;
-		rb_link_node(&he->rb_node, parent, p);
-		rb_insert_color(&he->rb_node, &hists->entries);
+		rb_link_node(&he->rb_node_in, parent, p);
+		rb_insert_color(&he->rb_node_in, root);
 		hists__inc_nr_entries(hists, he);
 	}
 out:
@@ -761,11 +769,16 @@ out:
 static struct hist_entry *hists__find_entry(struct hists *hists,
 					    struct hist_entry *he)
 {
-	struct rb_node *n = hists->entries.rb_node;
+	struct rb_node *n;
+
+	if (sort__need_collapse)
+		n = hists->entries_collapsed.rb_node;
+	else
+		n = hists->entries_in->rb_node;
 
 	while (n) {
-		struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
-		int64_t cmp = hist_entry__cmp(iter, he);
+		struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node_in);
+		int64_t cmp = hist_entry__collapse(iter, he);
 
 		if (cmp < 0)
 			n = n->rb_left;
@@ -783,11 +796,17 @@ static struct hist_entry *hists__find_entry(struct hists *hists,
  */
 void hists__match(struct hists *leader, struct hists *other)
 {
+	struct rb_root *root;
 	struct rb_node *nd;
 	struct hist_entry *pos, *pair;
 
-	for (nd = rb_first(&leader->entries); nd; nd = rb_next(nd)) {
-		pos  = rb_entry(nd, struct hist_entry, rb_node);
+	if (sort__need_collapse)
+		root = &leader->entries_collapsed;
+	else
+		root = leader->entries_in;
+
+	for (nd = rb_first(root); nd; nd = rb_next(nd)) {
+		pos  = rb_entry(nd, struct hist_entry, rb_node_in);
 		pair = hists__find_entry(other, pos);
 
 		if (pair)
@@ -802,11 +821,17 @@ void hists__match(struct hists *leader, struct hists *other)
  */
 int hists__link(struct hists *leader, struct hists *other)
 {
+	struct rb_root *root;
 	struct rb_node *nd;
 	struct hist_entry *pos, *pair;
 
-	for (nd = rb_first(&other->entries); nd; nd = rb_next(nd)) {
-		pos = rb_entry(nd, struct hist_entry, rb_node);
+	if (sort__need_collapse)
+		root = &other->entries_collapsed;
+	else
+		root = other->entries_in;
+
+	for (nd = rb_first(root); nd; nd = rb_next(nd)) {
+		pos = rb_entry(nd, struct hist_entry, rb_node_in);
 
 		if (!hist_entry__has_pairs(pos)) {
 			pair = hists__add_dummy_entry(leader, pos);
-- 
1.7.11.7

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