Re: [CFT][RFC] HT scheduler

[Davide Libenzi]

On Tue, 16 Dec 2003, Linus Torvalds wrote:

> I bet it is. In a big way.
> 
> The lock does two independent things:
>  - it tells the core that it can't just crack up the load and store.
>  - it also tells other memory ops that they can't re-order around it.

You forgot the one where no HT knowledge can be used for optimizations. 

- Asserting the CPU's #LOCK pin to take control of the system bus. That in 
  MP system translate into the signaling CPU taking full control of the 
  system bus until the pin is deasserted.



- Davide


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