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b525525b44
Transform L2ARC from single global feed thread to per-device threads, enabling parallel writes to multiple L2ARC devices. Each device runs its own feed thread independently, improving multi-device throughput. Previously, a single thread served all devices sequentially; now each device writes concurrently. Threads are created during device addition and torn down on removal. Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ameer Hamza <ahamza@ixsystems.com> Closes #18093