* [PATCH] selftests/bpf/get_cgroup_id: Use nanosleep() syscall instead of sleep()
@ 2021-03-16 15:30 Ravi Bangoria
2021-03-16 23:20 ` patchwork-bot+netdevbpf
0 siblings, 1 reply; 2+ messages in thread
From: Ravi Bangoria @ 2021-03-16 15:30 UTC (permalink / raw)
To: ast, shuah
Cc: ravi.bangoria, daniel, yhs, andrii, kafai, songliubraving,
john.fastabend, bpf, linux-kselftest
Glibc sleep() switched to clock_nanosleep() from nanosleep(),
thus syscalls:sys_enter_nanosleep tracepoint is not hitting
which is causing testcase failure. Instead of depending on
glibc sleep(), call nanosleep() systemcall directly.
Before:
# ./get_cgroup_id_user
...
main:FAIL:compare_cgroup_id kern cgid 0 user cgid 483
After:
# ./get_cgroup_id_user
...
main:PASS:compare_cgroup_id
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
---
tools/testing/selftests/bpf/get_cgroup_id_user.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/get_cgroup_id_user.c b/tools/testing/selftests/bpf/get_cgroup_id_user.c
index b8d6aef99db4..99628e1a1e58 100644
--- a/tools/testing/selftests/bpf/get_cgroup_id_user.c
+++ b/tools/testing/selftests/bpf/get_cgroup_id_user.c
@@ -57,6 +57,10 @@ int main(int argc, char **argv)
__u32 key = 0, pid;
int exit_code = 1;
char buf[256];
+ const struct timespec req = {
+ .tv_sec = 1,
+ .tv_nsec = 0,
+ };
cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
if (CHECK(cgroup_fd < 0, "cgroup_setup_and_join", "err %d errno %d\n", cgroup_fd, errno))
@@ -115,7 +119,7 @@ int main(int argc, char **argv)
goto close_pmu;
/* trigger some syscalls */
- sleep(1);
+ syscall(__NR_nanosleep, &req, NULL);
err = bpf_map_lookup_elem(cgidmap_fd, &key, &kcgid);
if (CHECK(err, "bpf_map_lookup_elem", "err %d errno %d\n", err, errno))
--
2.29.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] selftests/bpf/get_cgroup_id: Use nanosleep() syscall instead of sleep()
2021-03-16 15:30 [PATCH] selftests/bpf/get_cgroup_id: Use nanosleep() syscall instead of sleep() Ravi Bangoria
@ 2021-03-16 23:20 ` patchwork-bot+netdevbpf
0 siblings, 0 replies; 2+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-03-16 23:20 UTC (permalink / raw)
To: Ravi Bangoria
Cc: ast, shuah, daniel, yhs, andrii, kafai, songliubraving,
john.fastabend, bpf, linux-kselftest
Hello:
This patch was applied to bpf/bpf-next.git (refs/heads/master):
On Tue, 16 Mar 2021 21:00:48 +0530 you wrote:
> Glibc sleep() switched to clock_nanosleep() from nanosleep(),
> thus syscalls:sys_enter_nanosleep tracepoint is not hitting
> which is causing testcase failure. Instead of depending on
> glibc sleep(), call nanosleep() systemcall directly.
>
> Before:
> # ./get_cgroup_id_user
> ...
> main:FAIL:compare_cgroup_id kern cgid 0 user cgid 483
>
> [...]
Here is the summary with links:
- selftests/bpf/get_cgroup_id: Use nanosleep() syscall instead of sleep()
https://git.kernel.org/bpf/bpf-next/c/56901d483bf1
You are awesome, thank you!
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2021-03-16 15:30 [PATCH] selftests/bpf/get_cgroup_id: Use nanosleep() syscall instead of sleep() Ravi Bangoria
2021-03-16 23:20 ` patchwork-bot+netdevbpf
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