Re: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-07

[Ingo Molnar]

* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> OK, I'm declaring defeat here. I've been fighting race conditions all 
> day, and it's now 1 in the morning where I live. It looks like this 
> implementation has no other choice but to have the waking up "pending 
> owner" take the wait_list lock once again.  How heavy of a overhead is 
> that really?

as i mentioned it before, taking a lock is not a big issue at all. Since 
you have to touch the lock data structure anyway (and all of it fits 
into a single cacheline), it doesnt really matter whether it's atomic 
flag setting/clearing, or raw spinlock based.

later on, once things are stable and well-understood, we can still 
attempt to micro-optimize it.

	Ingo
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