Thanks for sharing. Can someone tell me what does this paragraph mean?

> Use a lock where you tell the system that you're waiting for the lock, and where the unlocking thread will let you know when it's done, so that the scheduler can actually work with you, instead of (randomly) working against you.

I have “implemented” a sleep lock in xv6. Is it what he meant? What does the Linux scheduler “know” about it and will do differently? (Trying to figure out what does “work with you” mean)

Thanks in advance.