BPF basic filtering test fails on s390x (when vmlinux debuginfo is
utilized instead of /proc/kallsyms)
Info:
- bpf_probe_load installs the bpf code at do_epoll_wait.
- For s390x, do_epoll_wait resolves to 3 functions including inlines.
found inline addr: 0x43769e
Probe point found: __s390_sys_epoll_wait+6
found inline addr: 0x437290
Probe point found: do_epoll_wait+0
found inline addr: 0x4375d6
Probe point found: __se_sys_epoll_wait+6
- add_bpf_event creates evsel for every probe in a BPF object. This
results in 3 evsels.
Solution:
- Expected result = 50% of the samples to be collected from epoll_wait *
number of entries present in the evlist.
Signed-off-by: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx>
Reviewed-by: Thomas Richter <tmricht@xxxxxxxxxxxxx>
---
tools/perf/tests/bpf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
index 5d20bf8397f0..cd77e334e577 100644
--- a/tools/perf/tests/bpf.c
+++ b/tools/perf/tests/bpf.c
@@ -197,7 +197,7 @@ static int do_test(struct bpf_object *obj, int (*func)(void),
perf_mmap__read_done(&md->core);
}
- if (count != expect) {
+ if (count != expect * evlist->core.nr_entries) {
pr_debug("BPF filter result incorrect, expected %d, got %d samples\n", expect, count);
goto out_delete_evlist;
}
--
2.17.1
