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selftests/bpf: Add exponential backoff to map_delete_retriable in test_maps
Using a fixed delay of 1 microsecond has proven flaky in slow CPU environment, e.g. Github Actions CI system. This patch adds exponential backoff with a cap of 50ms to reduce the flakiness of the test. Initial delay is chosen at random in the range [0ms, 5ms). Signed-off-by: Yucong Sun <fallentree@fb.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210817045713.3307985-1-fallentree@fb.com
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1 changed files with 6 additions and 1 deletions
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@ -1420,11 +1420,16 @@ static int map_update_retriable(int map_fd, const void *key, const void *value,
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static int map_delete_retriable(int map_fd, const void *key, int attempts)
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{
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int delay = rand() % MIN_DELAY_RANGE_US;
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while (bpf_map_delete_elem(map_fd, key)) {
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if (!attempts || (errno != EAGAIN && errno != EBUSY))
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return -errno;
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usleep(1);
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if (delay <= MAX_DELAY_US / 2)
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delay *= 2;
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usleep(delay);
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attempts--;
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}
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