[tip:perf/core] perf tests: Add map_groups__merge_in test

tip-bot for Jiri Olsa
2019-05-30T08:12:23Z

Commit-ID: 4f600bcf657d4d0476d0d96cb38077a72b8fb2af
Gitweb: https://git.kernel.org/tip/4f600bcf657d4d0476d0d96cb38077a72b8fb2af
Author: Jiri Olsa <jolsa@kernel.org>
AuthorDate: Wed, 8 May 2019 15:20:07 +0200
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 28 May 2019 18:37:44 -0300

perf tests: Add map_groups__merge_in test

Add map_groups__merge_in test to test the map_groups__merge_in function
usage - merging kcore maps into existing eBPF maps.

Committer testing:

# perf test merge
59: map_groups__merge_in : Ok
# perf test -v merge
59: map_groups__merge_in :
--- start ---
test child forked, pid 8349
test child finished with 0
---- end ----
map_groups__merge_in: Ok
#

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stanislav Fomichev <sdf@google.com>
Link: http://lkml.kernel.org/r/20190508132010.14512-10-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/tests/Build | 1 +
tools/perf/tests/builtin-test.c | 4 ++
tools/perf/tests/map_groups.c | 120 ++++++++++++++++++++++++++++++++++++++++
tools/perf/tests/tests.h | 1 +
tools/perf/util/map_groups.h | 2 +
tools/perf/util/symbol.c | 2 +-
6 files changed, 129 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 0b2b8305c965..4afb6319ed51 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -50,6 +50,7 @@ perf-y += perf-hooks.o
perf-y += clang.o
perf-y += unit_number__scnprintf.o
perf-y += mem2node.o
+perf-y += map_groups.o

$(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build
$(call rule_mkdir)
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 9852b5d624a5..941c5456d625 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -289,6 +289,10 @@ static struct test generic_tests[] = {
.desc = "mem2node",
.func = test__mem2node,
},
+ {
+ .desc = "map_groups__merge_in",
+ .func = test__map_groups__merge_in,
+ },
{
.func = NULL,
},
diff --git a/tools/perf/tests/map_groups.c b/tools/perf/tests/map_groups.c
new file mode 100644
index 000000000000..70d96acc6dcf
--- /dev/null
+++ b/tools/perf/tests/map_groups.c
@@ -0,0 +1,120 @@
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include "tests.h"
+#include "map.h"
+#include "map_groups.h"
+#include "dso.h"
+#include "debug.h"
+
+struct map_def {
+ const char *name;
+ u64 start;
+ u64 end;
+};
+
+static int check_maps(struct map_def *merged, unsigned int size, struct map_groups *mg)
+{
+ struct map *map;
+ unsigned int i = 0;
+
+ map = map_groups__first(mg);
+ while (map) {
+ TEST_ASSERT_VAL("wrong map start", map->start == merged[i].start);
+ TEST_ASSERT_VAL("wrong map end", map->end == merged[i].end);
+ TEST_ASSERT_VAL("wrong map name", !strcmp(map->dso->name, merged[i].name));
+ TEST_ASSERT_VAL("wrong map refcnt", refcount_read(&map->refcnt) == 2);
+
+ i++;
+ map = map_groups__next(map);
+
+ TEST_ASSERT_VAL("less maps expected", (map && i < size) || (!map && i == size));
+ }
+
+ return TEST_OK;
+}
+
+int test__map_groups__merge_in(struct test *t __maybe_unused, int subtest __maybe_unused)
+{
+ struct map_groups mg;
+ unsigned int i;
+ struct map_def bpf_progs[] = {
+ { "bpf_prog_1", 200, 300 },
+ { "bpf_prog_2", 500, 600 },
+ { "bpf_prog_3", 800, 900 },
+ };
+ struct map_def merged12[] = {
+ { "kcore1", 100, 200 },
+ { "bpf_prog_1", 200, 300 },
+ { "kcore1", 300, 500 },
+ { "bpf_prog_2", 500, 600 },
+ { "kcore1", 600, 800 },
+ { "bpf_prog_3", 800, 900 },
+ { "kcore1", 900, 1000 },
+ };
+ struct map_def merged3[] = {
+ { "kcore1", 100, 200 },
+ { "bpf_prog_1", 200, 300 },
+ { "kcore1", 300, 500 },
+ { "bpf_prog_2", 500, 600 },
+ { "kcore1", 600, 800 },
+ { "bpf_prog_3", 800, 900 },
+ { "kcore1", 900, 1000 },
+ { "kcore3", 1000, 1100 },
+ };
+ struct map *map_kcore1, *map_kcore2, *map_kcore3;
+ int ret;
+
+ map_groups__init(&mg, NULL);
+
+ for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
+ struct map *map;
+
+ map = dso__new_map(bpf_progs[i].name);
+ TEST_ASSERT_VAL("failed to create map", map);
+
+ map->start = bpf_progs[i].start;
+ map->end = bpf_progs[i].end;
+ map_groups__insert(&mg, map);
+ map__put(map);
+ }
+
+ map_kcore1 = dso__new_map("kcore1");
+ TEST_ASSERT_VAL("failed to create map", map_kcore1);
+
+ map_kcore2 = dso__new_map("kcore2");
+ TEST_ASSERT_VAL("failed to create map", map_kcore2);
+
+ map_kcore3 = dso__new_map("kcore3");
+ TEST_ASSERT_VAL("failed to create map", map_kcore3);
+
+ /* kcore1 map overlaps over all bpf maps */
+ map_kcore1->start = 100;
+ map_kcore1->end = 1000;
+
+ /* kcore2 map hides behind bpf_prog_2 */
+ map_kcore2->start = 550;
+ map_kcore2->end = 570;
+
+ /* kcore3 map hides behind bpf_prog_3, kcore1 and adds new map */
+ map_kcore3->start = 880;
+ map_kcore3->end = 1100;
+
+ ret = map_groups__merge_in(&mg, map_kcore1);
+ TEST_ASSERT_VAL("failed to merge map", !ret);
+
+ ret = check_maps(merged12, ARRAY_SIZE(merged12), &mg);
+ TEST_ASSERT_VAL("merge check failed", !ret);
+
+ ret = map_groups__merge_in(&mg, map_kcore2);
+ TEST_ASSERT_VAL("failed to merge map", !ret);
+
+ ret = check_maps(merged12, ARRAY_SIZE(merged12), &mg);
+ TEST_ASSERT_VAL("merge check failed", !ret);
+
+ ret = map_groups__merge_in(&mg, map_kcore3);
+ TEST_ASSERT_VAL("failed to merge map", !ret);
+
+ ret = check_maps(merged3, ARRAY_SIZE(merged3), &mg);
+ TEST_ASSERT_VAL("merge check failed", !ret);
+ return TEST_OK;
+}
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 399f18ca71a3..e5e3a57cd373 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -107,6 +107,7 @@ const char *test__clang_subtest_get_desc(int subtest);
int test__clang_subtest_get_nr(void);
int test__unit_number__scnprint(struct test *test, int subtest);
int test__mem2node(struct test *t, int subtest);
+int test__map_groups__merge_in(struct test *t, int subtest);

bool test__bp_signal_is_supported(void);
bool test__wp_is_supported(void);
diff --git a/tools/perf/util/map_groups.h b/tools/perf/util/map_groups.h
index 4dcda33e0fdf..5f25efa6d6bc 100644
--- a/tools/perf/util/map_groups.h
+++ b/tools/perf/util/map_groups.h
@@ -88,4 +88,6 @@ int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map, FILE

struct map *map_groups__find_by_name(struct map_groups *mg, const char *name);

+int map_groups__merge_in(struct map_groups *kmaps, struct map *new_map);
+
#endif // __PERF_MAP_GROUPS_H
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 29780fcd049c..f4540f8bbed1 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1170,7 +1170,7 @@ static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
* Merges map into map_groups by splitting the new map
* within the existing map regions.
*/
-static int map_groups__merge_in(struct map_groups *kmaps, struct map *new_map)
+int map_groups__merge_in(struct map_groups *kmaps, struct map *new_map)
{
struct map *old_map;
LIST_HEAD(merged);