During July 2025, Lulu contributed to the geerlingguy/linux repository by reintroducing the kthread API for vhost workers and implementing a mode selection mechanism. This feature allows userspace to choose between kthread and task worker modes through new IOCTLs, with a module parameter enabling default configuration. Working in C and leveraging expertise in device drivers and kernel development, Lulu ensured that CPU usage accounting aligns with the selected worker mode, providing accurate resource attribution. The changes improved compatibility with legacy vhost applications by preserving existing interfaces while reducing configuration complexity, demonstrating a focused approach to system programming and maintainability.