From 45dc1bb5c1d47f9519e2101f6b073bb4bb1d1f99 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Mon, 12 May 2014 14:50:03 +0200 Subject: [PATCH] perf tests: Add test for closing dso objects on EMFILE error Testing that perf properly closes opened dso objects and tries to reopen in case we run out of allowed file descriptors for dso data. Acked-by: Namhyung Kim Cc: Arnaldo Carvalho de Melo Cc: Corey Ashford Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jean Pihet Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Reviewed by: David Ahern Link: http://lkml.kernel.org/r/1401892622-30848-14-git-send-email-jolsa@kernel.org Signed-off-by: Jiri Olsa --- tools/perf/tests/builtin-test.c | 4 ++ tools/perf/tests/dso-data.c | 73 +++++++++++++++++++++++++++++++++ tools/perf/tests/tests.h | 1 + 3 files changed, 78 insertions(+) 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 @@ -59,6 +59,10 @@ static struct test { .desc = "Test dso data cache", .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); -- 2.30.2