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Run below command 10 times in each case: ./context_switch1_processes -s 20 -t 50 -n Trim the results by removing the top and down 10% of the data in each case, and I got below numbers: case 1:16444675.45Set as 1 case 2:16412285.61~99.80% case 3:16405716.19~99.76% As you can see from the results, in case 2 with optimization based on XFEATURE_MASK_KERNEL_DYNAMIC, the performance gain is ~0.2%. So I'm not sure whether XFEATURE_MASK_KERNEL_DYNAMIC and related changes are worth or not for this series. Could you share your thoughts? Thanks a lot!