[PATCH v3 3/5] perf cpumap: Add intersect function.

[Ian Rogers]

The merge function gives the union of two cpu maps. Add an intersect
function which will be used in the next change.

Signed-off-by: Ian Rogers <irogers at google.com>
---
 tools/lib/perf/cpumap.c              | 35 ++++++++++++++++++++++++++++
 tools/lib/perf/include/perf/cpumap.h |  2 ++
 tools/perf/tests/builtin-test.c      |  1 +
 tools/perf/tests/cpumap.c            | 35 ++++++++++++++++++++++++++++
 tools/perf/tests/tests.h             |  1 +
 5 files changed, 74 insertions(+)

diff --git a/tools/lib/perf/cpumap.c b/tools/lib/perf/cpumap.c
index 95c56e17241b..66371135e742 100644
--- a/tools/lib/perf/cpumap.c
+++ b/tools/lib/perf/cpumap.c
@@ -385,3 +385,38 @@ struct perf_cpu_map *perf_cpu_map__merge(struct perf_cpu_map *orig,
 	free(tmp_cpus);
 	return merged;
 }
+
+struct perf_cpu_map *perf_cpu_map__intersect(struct perf_cpu_map *orig,
+					     struct perf_cpu_map *other)
+{
+	struct perf_cpu *tmp_cpus;
+	int tmp_len;
+	int i, j, k;
+	struct perf_cpu_map *merged = NULL;
+
+	if (perf_cpu_map__is_subset(other, orig))
+		return perf_cpu_map__get(orig);
+	if (perf_cpu_map__is_subset(orig, other))
+		return perf_cpu_map__get(other);
+
+	tmp_len = max(orig->nr, other->nr);
+	tmp_cpus = malloc(tmp_len * sizeof(struct perf_cpu));
+	if (!tmp_cpus)
+		return NULL;
+
+	i = j = k = 0;
+	while (i < orig->nr && j < other->nr) {
+		if (orig->map[i].cpu < other->map[j].cpu)
+			i++;
+		else if (orig->map[i].cpu > other->map[j].cpu)
+			j++;
+		else {
+			j++;
+			tmp_cpus[k++] = orig->map[i++];
+		}
+	}
+	if (k)
+		merged = cpu_map__trim_new(k, tmp_cpus);
+	free(tmp_cpus);
+	return merged;
+}
diff --git a/tools/lib/perf/include/perf/cpumap.h b/tools/lib/perf/include/perf/cpumap.h
index 4a2edbdb5e2b..a2a7216c0b78 100644
--- a/tools/lib/perf/include/perf/cpumap.h
+++ b/tools/lib/perf/include/perf/cpumap.h
@@ -19,6 +19,8 @@ LIBPERF_API struct perf_cpu_map *perf_cpu_map__read(FILE *file);
 LIBPERF_API struct perf_cpu_map *perf_cpu_map__get(struct perf_cpu_map *map);
 LIBPERF_API struct perf_cpu_map *perf_cpu_map__merge(struct perf_cpu_map *orig,
 						     struct perf_cpu_map *other);
+LIBPERF_API struct perf_cpu_map *perf_cpu_map__intersect(struct perf_cpu_map *orig,
+							 struct perf_cpu_map *other);
 LIBPERF_API void perf_cpu_map__put(struct perf_cpu_map *map);
 LIBPERF_API struct perf_cpu perf_cpu_map__cpu(const struct perf_cpu_map *cpus, int idx);
 LIBPERF_API int perf_cpu_map__nr(const struct perf_cpu_map *cpus);
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index fac3717d9ba1..dffa41e7ee20 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -88,6 +88,7 @@ static struct test_suite *generic_tests[] = {
 	&suite__backward_ring_buffer,
 	&suite__cpu_map_print,
 	&suite__cpu_map_merge,
+	&suite__cpu_map_intersect,
 	&suite__sdt_event,
 	&suite__is_printable_array,
 	&suite__bitmap_print,
diff --git a/tools/perf/tests/cpumap.c b/tools/perf/tests/cpumap.c
index 3b9fc549d30b..112331829414 100644
--- a/tools/perf/tests/cpumap.c
+++ b/tools/perf/tests/cpumap.c
@@ -153,6 +153,41 @@ static int test__cpu_map_merge(struct test_suite *test __maybe_unused, int subte
 	return ret;
 }
 
+static int __test__cpu_map_intersect(const char *lhs, const char *rhs, int nr, const char *expected)
+{
+	struct perf_cpu_map *a = perf_cpu_map__new(lhs);
+	struct perf_cpu_map *b = perf_cpu_map__new(rhs);
+	struct perf_cpu_map *c = perf_cpu_map__intersect(a, b);
+	char buf[100];
+
+	TEST_ASSERT_EQUAL("failed to intersect map: bad nr", perf_cpu_map__nr(c), nr);
+	cpu_map__snprint(c, buf, sizeof(buf));
+	TEST_ASSERT_VAL("failed to intersect map: bad result", !strcmp(buf, expected));
+	perf_cpu_map__put(a);
+	perf_cpu_map__put(b);
+	perf_cpu_map__put(c);
+	return 0;
+}
+
+static int test__cpu_map_intersect(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
+{
+	int ret;
+
+	ret = __test__cpu_map_intersect("4,2,1", "4,5,7", 1, "4");
+	if (ret) return ret;
+	ret = __test__cpu_map_intersect("1-8", "6-9", 3, "6-8");
+	if (ret) return ret;
+	ret = __test__cpu_map_intersect("1-8,12-20", "6-9,15", 4, "6-8,15");
+	if (ret) return ret;
+	ret = __test__cpu_map_intersect("4,2,1", "1", 1, "1");
+	if (ret) return ret;
+	ret = __test__cpu_map_intersect("1", "4,2,1", 1, "1");
+	if (ret) return ret;
+	ret = __test__cpu_map_intersect("1", "1", 1, "1");
+	return ret;
+}
+
 DEFINE_SUITE("Synthesize cpu map", cpu_map_synthesize);
 DEFINE_SUITE("Print cpu map", cpu_map_print);
 DEFINE_SUITE("Merge cpu map", cpu_map_merge);
+DEFINE_SUITE("Intersect cpu map", cpu_map_intersect);
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 5bbb8f6a48fc..f2823c4859b8 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -127,6 +127,7 @@ DECLARE_SUITE(event_times);
 DECLARE_SUITE(backward_ring_buffer);
 DECLARE_SUITE(cpu_map_print);
 DECLARE_SUITE(cpu_map_merge);
+DECLARE_SUITE(cpu_map_intersect);
 DECLARE_SUITE(sdt_event);
 DECLARE_SUITE(is_printable_array);
 DECLARE_SUITE(bitmap_print);
-- 
2.35.1.1178.g4f1659d476-goog