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perf tests: Add test for closing dso objects on EMFILE error

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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 <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed by: David Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/1401892622-30848-14-git-send-email-jolsa@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
This commit is contained in:
Jiri Olsa 2014-05-12 14:50:03 +02:00
parent 4ebbcb84b1
commit 45dc1bb5c1
3 changed files with 78 additions and 0 deletions
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4
tools/perf/tests/builtin-test.c
View File

@ -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,

73
tools/perf/tests/dso-data.c
View File

@ -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;
}

1
tools/perf/tests/tests.h
View File

@ -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);