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Historically, it wasn't possible to implement reliable userspace spinlocks in Linux. That means that spin locks would be counterproductive, competing with the lock holder for CPU time or spinning when the holder is sleeping. The only trustworthy approach for now is to use sleepable mutexes, that requires a whole context switch. Several different approaches have been tried in the past to improve the situation. This talk will give an overview of a new approach for safe and useful userspace spinlocks using futex with extended information.
André Almeida is a kernel developer from employee-owned open source consultancy Igalia. He's most known from his work at futex2. He also loves to teach the kernel for newbies and is currently learning more about DRM.
