Fix perf event #9841
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Fix perf event #9841
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Problem: bpf_cookie selftest fails if it runs after task_work selftest: perf_event_open fails with errno=EINVAL. EINVAL indicates incorrect/invalid input argument, which in case of bpf_cookie can only point to sample_freq attribute. Possible root cause: When running task_work test, we can see that perf subsystem lowers kernel.perf_event_max_sample_rate which probably is the side-effect of the test that make bpf_cookie fail. Solution: Set perf_event_open sampling rate attribute for bpf_cookie the same as task_work - this is the most reliable solution for this, changing task_work sampling rate resulted in task_work test becoming flaky. Signed-off-by: Mykyta Yatsenko <[email protected]>
task_work selftest does not properly handle cleanup during failures: * destroy bpf_link * perf event fd is passed to bpf_link, no need to close it if link was created successfully * goto cleanup if fork() failed, close pipe. Signed-off-by: Mykyta Yatsenko <[email protected]>
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