Messages in this thread | | | Date | Tue, 6 Apr 2010 20:15:40 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH V2 0/6][RFC] futex: FUTEX_LOCK with optional adaptive spinning |
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On Tue, 6 Apr 2010, Alan Cox wrote:
> > > 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 ;)
Well, 1970's RTOSes had other features as well like preemption disable mechanisms and other interesting stuff. I hope you're not going to propose that next to bring us up to par with those :)
Thanks,
tglx
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