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| author | Jiri Olsa <jolsa@redhat.com> | 2021-10-21 13:41:31 +0200 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2021-10-21 15:59:28 -0700 |
| commit | aa274f98b269b2babf37b6308f8a1a009ca4fc41 (patch) | |
| tree | 3782b7a27a8ee5d8cd3daee3f60b331537ea0288 /tools/testing/selftests/bpf/progs | |
| parent | d4121376ac7a9c81a696d7558789b2f29ef3574e (diff) | |
selftests/bpf: Fix possible/online index mismatch in perf_buffer test
The perf_buffer fails on system with offline cpus:
# test_progs -t perf_buffer
serial_test_perf_buffer:PASS:nr_cpus 0 nsec
serial_test_perf_buffer:PASS:nr_on_cpus 0 nsec
serial_test_perf_buffer:PASS:skel_load 0 nsec
serial_test_perf_buffer:PASS:attach_kprobe 0 nsec
serial_test_perf_buffer:PASS:perf_buf__new 0 nsec
serial_test_perf_buffer:PASS:epoll_fd 0 nsec
skipping offline CPU #4
serial_test_perf_buffer:PASS:perf_buffer__poll 0 nsec
serial_test_perf_buffer:PASS:seen_cpu_cnt 0 nsec
serial_test_perf_buffer:PASS:buf_cnt 0 nsec
...
serial_test_perf_buffer:PASS:fd_check 0 nsec
serial_test_perf_buffer:PASS:drain_buf 0 nsec
serial_test_perf_buffer:PASS:consume_buf 0 nsec
serial_test_perf_buffer:FAIL:cpu_seen cpu 5 not seen
#88 perf_buffer:FAIL
Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED
If the offline cpu is from the middle of the possible set,
we get mismatch with possible and online cpu buffers.
The perf buffer test calls perf_buffer__consume_buffer for
all 'possible' cpus, but the library holds only 'online'
cpu buffers and perf_buffer__consume_buffer returns them
based on index.
Adding extra (online) index to keep track of online buffers,
we need the original (possible) index to trigger trace on
proper cpu.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20211021114132.8196-3-jolsa@kernel.org
Diffstat (limited to 'tools/testing/selftests/bpf/progs')
0 files changed, 0 insertions, 0 deletions