Merge branch 'selftests/bpf: Fixes for map_percpu_stats test'

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Hou Tao says:

====================
From: Hou Tao <houtao1@huawei.com>

Hi,

BPF CI failed due to map_percpu_stats_percpu_hash from time to time [1].
It seems that the failure reason is per-cpu bpf memory allocator may not
be able to allocate per-cpu pointer successfully and it can not refill
free llist timely, and bpf_map_update_elem() will return -ENOMEM.

Patch #1 fixes the size of value passed to per-cpu map update API. The
problem was found when fixing the ENOMEM problem, so also post it in
this patchset. Patch #2 & #3 mitigates the ENOMEM problem by retrying
the update operation for non-preallocated per-cpu map.

Please see individual patches for more details. And comments are always
welcome.

Regards,
Tao

[1]: https://github.com/kernel-patches/bpf/actions/runs/6713177520/job/18244865326?pr=5909
====================

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Andrii Nakryiko 2023-11-02 09:47:41 -07:00 • committed by Alexei Starovoitov

parent cd9c127069 2f553b032c

commit e3499962d8

3 changed files with 53 additions and 8 deletions

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39

tools/testing/selftests/bpf/map_tests/map_percpu_stats.c

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17

tools/testing/selftests/bpf/test_maps.c

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5

tools/testing/selftests/bpf/test_maps.h

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