selftests/bpf: perf_link: avoid failures in concurrent mode#11296
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perf_link creates a system-wide perf event pinned to CPU 0 (pid=-1, cpu=0) and also pins the test thread to CPU 0. Under concurrent selftests this can lead to cross-test interference and CPU 0 contention, making the test flaky. Create a per-task perf event instead (pid=0, cpu=-1) and drop CPU pinning from burn_cpu(). Use barrier() to prevent the burn loop from being optimized away. Drop the serial_ prefix so the test can run in parallel. Also remove the stale TODO comment. Tested: ./test_progs -t perf_link -vv ./test_progs -j$(nproc) -t perf_link -vv for i in $(seq 1 50); do ./test_progs -j$(nproc) -t perf_link; done Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
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Pull request for series with
subject: selftests/bpf: perf_link: avoid failures in concurrent mode
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1061795