Re: [PATCH V2 0/6][RFC] futex: FUTEX_LOCK with optional adaptivespinning

[Alan Cox]

> > IMO the best solution is to spin in userspace while the lock holder is
> > running, fall into the kernel when it is scheduled out.
> 
> That's just not realistic as user space has no idea whether the lock
> holder is running or not and when it's scheduled out without a syscall :)

Which is the real problem that wants addressing and can be addressed very
cheaply. That would bring us up to par with 1970s RTOS environments ;)

Alan
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