[bpf-next,0/2] selftests/bpf: fix flaky send_signal test

Message

Yonghong Song Aug. 17, 2021, 5:19 p.m. UTC

The bpf selftest send_signal() is flaky for its subtests trying to
send signals in softirq/nmi context. To reduce flakiness, the
signal-targetted process priority is boosted, which should minimize
preemption of that process and improve the possibility that
the underlying task in softirq/nmi context is the bpf_send_signal()
wanted task.

Patch #1 did a refactoring to use ASSERT_* instead of old CHECK macros.
Patch #2 did actual change of boosting priority.

Yonghong Song (2):
  selftests/bpf: replace CHECK with ASSERT_* macros in send_signal.c
  selftests/bpf: fix flaky send_signal test

 .../selftests/bpf/prog_tests/send_signal.c    | 68 ++++++++++++-------
 .../bpf/progs/test_send_signal_kern.c         |  3 +-
 2 files changed, 43 insertions(+), 28 deletions(-)