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2f41b9d865
This commit introduces per-sublist persistent markers that eliminate redundant tail scanning between L2ARC iterations, providing significant CPU efficiency improvements. Markers are pre-allocated during device initialization and properly cleaned up during device removal. The implementation uses conditional behavior based on device capacity: small devices (capacity < arc_c) retain original HEAD/TAIL scanning based on ARC warmup state, while large devices (capacity >= arc_c) use the persistent marker approach for optimal CPU efficiency. 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 |
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