3 files changed, 78 insertions, 0 deletions

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index b8a63583566f..6f8b01bc6033 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -60,6 +60,10 @@ static struct test {
                 .func = test__dso_data_cache,
         },
         {
+                .desc = "Test dso data reopen",
+                .func = test__dso_data_reopen,
+        },
+        {
                 .desc = "roundtrip evsel->name check",
                 .func = test__perf_evsel__roundtrip_name_test,
         },
diff --git a/tools/perf/tests/dso-data.c b/tools/perf/tests/dso-data.c
index 2d30014d716b..630808cd7cc2 100644
--- a/tools/perf/tests/dso-data.c
+++ b/tools/perf/tests/dso-data.c
@@ -283,3 +283,76 @@ int test__dso_data_cache(void)
         TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
         return 0;
 }
+
+int test__dso_data_reopen(void)
+{
+        struct machine machine;
+        long nr_end, nr = open_files_cnt();
+        int fd, fd_extra;
+
+#define dso_0 (dsos[0])
+#define dso_1 (dsos[1])
+#define dso_2 (dsos[2])
+
+        memset(&machine, 0, sizeof(machine));
+
+        /*
+         * Test scenario:
+         * - create 3 dso objects
+         * - set process file descriptor limit to current
+         *   files count + 3
+         * - test that the first dso gets closed when we
+         *   reach the files count limit
+         */
+
+        /* Make sure we are able to open 3 fds anyway */
+        TEST_ASSERT_VAL("failed to set file limit",
+                        !set_fd_limit((nr + 3)));
+
+        TEST_ASSERT_VAL("failed to create dsos\n", !dsos__create(3, TEST_FILE_SIZE));
+
+        /* open dso_0 */
+        fd = dso__data_fd(dso_0, &machine);
+        TEST_ASSERT_VAL("failed to get fd", fd > 0);
+
+        /* open dso_1 */
+        fd = dso__data_fd(dso_1, &machine);
+        TEST_ASSERT_VAL("failed to get fd", fd > 0);
+
+        /*
+         * open extra file descriptor and we just
+         * reached the files count limit
+         */
+        fd_extra = open("/dev/null", O_RDONLY);
+        TEST_ASSERT_VAL("failed to open extra fd", fd_extra > 0);
+
+        /* open dso_2 */
+        fd = dso__data_fd(dso_2, &machine);
+        TEST_ASSERT_VAL("failed to get fd", fd > 0);
+
+        /*
+         * dso_0 should get closed, because we reached
+         * the file descriptor limit
+         */
+        TEST_ASSERT_VAL("failed to close dso_0", dso_0->data.fd == -1);
+
+        /* open dso_0 */
+        fd = dso__data_fd(dso_0, &machine);
+        TEST_ASSERT_VAL("failed to get fd", fd > 0);
+
+        /*
+         * dso_1 should get closed, because we reached
+         * the file descriptor limit
+         */
+        TEST_ASSERT_VAL("failed to close dso_1", dso_1->data.fd == -1);
+
+        /* cleanup everything */
+        close(fd_extra);
+        dsos__delete(3);
+
+        /* Make sure we did not leak any file descriptor. */
+        nr_end = open_files_cnt();
+        pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
+        TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
+        return 0;
+}
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index ccc4deb2d963..ed64790a395f 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -29,6 +29,7 @@ int test__pmu(void);
 int test__attr(void);
 int test__dso_data(void);
 int test__dso_data_cache(void);
+int test__dso_data_reopen(void);
 int test__parse_events(void);
 int test__hists_link(void);
 int test__python_use(void);