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

[Ingo Molnar]

* Bill Davidsen <davidsen@xxxxxxx> wrote:

> >What are you suggesting here, that the implementation of 
> >FUTEX_WAKE_OP is "ignoring inefficiencies"? Please explain why and 
> >what you would do differently to solve that inefficiency.
>
> I am suggesting that "There are no such situations anymore in an 
> optimal userlevel implementation" is not the right approach to the 
> original post. What I would do differently is to evaluate the original 
> suggestion to see if it would in fact be more efficient. [...]

that's what we did a year ago for a similar futex rescheduling 
inefficiency, and came up with the FUTEX_WAKE_OP solution, which is now 
part of the kernel and is used by glibc. But we are all ears for 
alternative suggestions.

	Ingo
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