Worked on enhancing the sched-ext/scx repository by addressing scalability and reliability challenges in kernel scheduling for large-core systems. Expanded the cpumask capacity from 4 to 128 bits, preventing mask overflow and ensuring stable scheduling on systems with high CPU counts. Introduced new iterator macros, for_each_possible_cpu() and for_each_online_cpu(), within the BPF environment to standardize and simplify CPU mask iteration, streamlining system programming tasks. Leveraged expertise in C, BPF, and kernel development to deliver these improvements, enabling sched-ext/scx to support larger deployments with minimal risk of CPU mask limitations and more efficient development cycles for CPU-related features.