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selftests/bpf: Reduce flakyness in timer_mim

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This patch extends wait time in timer_mim. As observed in slow CI environment,
it is possible to have interrupt/preemption long enough to cause the test to
fail, almost 1 failure in 5 runs.

Signed-off-by: Yucong Sun <fallentree@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210823213629.3519641-1-fallentree@fb.com
This commit is contained in:
Yucong Sun 2021-08-23 14:36:29 -07:00 committed by Alexei Starovoitov
parent 4ed589a278
commit a6258837c8
1 changed files with 12 additions and 4 deletions
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16
tools/testing/selftests/bpf/prog_tests/timer_mim.c
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@ -23,8 +23,12 @@ static int timer_mim(struct timer_mim *timer_skel)
/* check that timer_cb[12] are incrementing 'cnt' */
cnt1 = READ_ONCE(timer_skel->bss->cnt);
usleep(200); /* 100 times more than interval */
cnt2 = READ_ONCE(timer_skel->bss->cnt);
for (int i = 0; i < 100; i++) {
cnt2 = READ_ONCE(timer_skel->bss->cnt);
if (cnt2 != cnt1)
break;
usleep(200); /* 100 times more than interval */
}
ASSERT_GT(cnt2, cnt1, "cnt");
ASSERT_EQ(timer_skel->bss->err, 0, "err");
@ -37,8 +41,12 @@ static int timer_mim(struct timer_mim *timer_skel)
/* check that timer_cb[12] are no longer running */
cnt1 = READ_ONCE(timer_skel->bss->cnt);
usleep(200);
cnt2 = READ_ONCE(timer_skel->bss->cnt);
for (int i = 0; i < 100; i++) {
usleep(200); /* 100 times more than interval */
cnt2 = READ_ONCE(timer_skel->bss->cnt);
if (cnt2 == cnt1)
break;
}
ASSERT_EQ(cnt2, cnt1, "cnt");
return 0;