Re: [PATCH] 2.6.16 - futex: small optimization (?)

[Ingo Molnar <mingo@elte.hu>]

* Bill Davidsen <davidsen@tmr.com> wrote:

> >>>There are no such situations anymore in an optimal userlevel
> >>>implementation.  The last problem (in pthread_cond_signal) was fixed
> >>>by the addition of FUTEX_WAKE_OP.  The userlevel code you're looking
> >>>at is simply not optimized for the modern kernels.
> >>What are you suggesting here, that the kernel can be inefficient as 
> >>long as the user has a way to program around it?
> >
> >What are you suggesting here, that FUTEX_WAKE_UP is a "user way to 
> >program around" an inefficiency? If yes then please explain to me why 
> >and what you would do differently.
> 
> The point I'm making is that even if an application is "not optimized 
> for modern kernels" or whatever, there's no reason to ignore 
> inefficiencies. [...]

What are you suggesting here, that the implementation of FUTEX_WAKE_UP
is "ignoring inefficiencies"? Please explain why and what you would do
differently to solve that inefficiency.

	Ingo