selftests: ublk: improve I/O ordering test with bpftrace #515
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The in-tree approach requires sequential IO maintained in the whole IO stack, which is too strict and may cause false positive because of IO reorder caused by block layer core code, and generic_01 only covers IO order in ublk dispatch code path. Rework test_generic_01 to verify that ublk dispatch doesn't reorder I/O by comparing request start order with completion order using bpftrace. The bpftrace script now: - Tracks each request's start sequence number in a map keyed by sector - On completion, verifies the request's start order matches expected completion order - Reports any out-of-order completions detected The test script: - Wait bpftrace BEGIN code block is run - Pins fio to CPU 0 for deterministic behavior - Uses block_io_start and block_rq_complete tracepoints - Checks bpftrace output for reordering errors Reported-and-tested-by: Alexander Atanasov <alex@zazolabs.com> Signed-off-by: Ming Lei <ming.lei@redhat.com>
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Pull request for series with
subject: selftests: ublk: improve I/O ordering test with bpftrace
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1047138