[PATCH v5 3/7] perf util: Compare two streams

[Jin Yao]

Stream is the branch history which is aggregated by the branch
records from perf samples. Now we support the callchain as
stream.

If the callchain entries of one stream are fully matched with
the callchain entries of another stream, we think two streams
are matched.

For example,

   cycles: 1, hits: 26.80%                 cycles: 1, hits: 27.30%
   -----------------------                 -----------------------
             main div.c:39                           main div.c:39
             main div.c:44                           main div.c:44

Above two streams are matched (we don't consider the case that
source code is changed).

The matching logic is, compare the chain string first. If it's not
matched, fallback to dso address comparison.

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
 v5:
   - Remove enum stream_type
   - Rebase to perf/core

 v4:
   - Remove original source line comparison code.

 tools/perf/util/callchain.c | 54 +++++++++++++++++++++++++++++++++++++
 tools/perf/util/callchain.h |  3 +++
 2 files changed, 57 insertions(+)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 9a9b56ed3f0a..7cab271e656b 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1599,3 +1599,57 @@ void callchain_cursor_reset(struct callchain_cursor *cursor)
 	for (node = cursor->first; node != NULL; node = node->next)
 		map__zput(node->map);
 }
+
+static bool chain_match(struct callchain_list *base_chain,
+			struct callchain_list *pair_chain)
+{
+	enum match_result match;
+
+	match = match_chain_strings(base_chain->srcline,
+				    pair_chain->srcline);
+	if (match != MATCH_ERROR)
+		return match == MATCH_EQ;
+
+	match = match_chain_dso_addresses(base_chain->ms.map,
+					  base_chain->ip,
+					  pair_chain->ms.map,
+					  pair_chain->ip);
+
+	return match == MATCH_EQ;
+}
+
+bool callchain_cnode_matched(struct callchain_node *base_cnode,
+			     struct callchain_node *pair_cnode)
+{
+	struct callchain_list *base_chain, *pair_chain;
+	bool match = false;
+
+	pair_chain = list_first_entry(&pair_cnode->val,
+				      struct callchain_list,
+				      list);
+
+	list_for_each_entry(base_chain, &base_cnode->val, list) {
+		if (&pair_chain->list == &pair_cnode->val)
+			return false;
+
+		if (!base_chain->srcline || !pair_chain->srcline) {
+			pair_chain = list_next_entry(pair_chain, list);
+			continue;
+		}
+
+		match = chain_match(base_chain, pair_chain);
+		if (!match)
+			return false;
+
+		pair_chain = list_next_entry(pair_chain, list);
+	}
+
+	/*
+	 * Say chain1 is ABC, chain2 is ABCD, we consider they are
+	 * not fully matched.
+	 */
+	if (pair_chain && (&pair_chain->list != &pair_cnode->val))
+		return false;
+
+	return match;
+}
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index 83398e5bbe4b..72134bed49d8 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -290,4 +290,7 @@ int callchain_branch_counts(struct callchain_root *root,
 			    u64 *branch_count, u64 *predicted_count,
 			    u64 *abort_count, u64 *cycles_count);
 
+bool callchain_cnode_matched(struct callchain_node *base_cnode,
+			     struct callchain_node *pair_cnode);
+
 #endif	/* __PERF_CALLCHAIN_H */
-- 
2.17.1