各位好，
最近在网络上[1][2]看到说排程器可以deschedule正在等待user-level lock的thread，
请问有人知道kernel是如何知道thread目前是blocking在user-level lock的等待上？
谢谢各位！
[1] https://perfetto.dev/docs/data-sources/cpu-scheduling
[2] https://netdevconf.info/0x15/papers/25/ghOSt.pdf
(“User-level threading is not enough”这小节)