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selftests/bpf: Add exponential backoff to map_update_retriable in test_maps

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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>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210816175250.296110-1-fallentree@fb.com
This commit is contained in:
Yucong Sun 2021-08-16 10:52:50 -07:00 committed by Andrii Nakryiko
parent 1e1e49df02
commit 3c3bd542ff
1 changed files with 8 additions and 1 deletions
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9
tools/testing/selftests/bpf/test_maps.c
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@ -1396,15 +1396,22 @@ static void test_map_stress(void)
#define DO_DELETE 0
#define MAP_RETRIES 20
#define MAX_DELAY_US 50000
#define MIN_DELAY_RANGE_US 5000
static int map_update_retriable(int map_fd, const void *key, const void *value,
int flags, int attempts)
{
int delay = rand() % MIN_DELAY_RANGE_US;
while (bpf_map_update_elem(map_fd, key, value, flags)) {
if (!attempts || (errno != EAGAIN && errno != EBUSY))
return -errno;
usleep(1);
if (delay <= MAX_DELAY_US / 2)
delay *= 2;
usleep(delay);
attempts--;
}