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Add new UBLK_DEV_F_MLOCK_IO_BUFFER flag to lock IO buffer pages in memory, preventing them from being swapped to disk for predictable IO latency. Key changes: - Add UBLK_DEV_F_MLOCK_IO_BUFFER flag to UblkFlags - Enhance IoBuf with mlock/munlock support via new_with_mlock() - Add feature compatibility validation (incompatible with USER_COPY, AUTO_BUF_REG, and SUPPORT_ZERO_COPY) - Integrate mlock support in UblkDev::alloc_queue_io_bufs() - Add comprehensive test coverage for mlock functionality - Don't discard io buffer pages in case of UBLK_DEV_F_MLOCK_IO_BUFFER - Update loop example with --mlock-io-buffer command line option - Document CAP_IPC_LOCK capability requirement The feature requires CAP_IPC_LOCK capability and can be granted with: sudo setcap cap_ipc_lock=eip $UBLK_EXECUTABLE Signed-off-by: Ming Lei <tom.leiming@gmail.com>
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Add new UBLK_DEV_F_MLOCK_IO_BUFFER flag to lock IO buffer pages in memory, preventing them from being swapped to disk for predictable IO latency.
Key changes:
The feature requires CAP_IPC_LOCK capability and can be granted with: sudo setcap cap_ipc_lock=eip $UBLK_EXECUTABLE