Re: x86: Is there still value in having a special tlb flush IPI vector?

[Jeremy Fitzhardinge]

Andi Kleen wrote:
> > Yes, but it's only held briefly to put things onto the list.  It doesn't 
> > get held over the whole IPI transaction as the old smp_call_function 
> > did, and the tlb flush code still does.  RCU is used to manage the list 
> > walk and freeing, so there's no long-held locks there either.
> >     
>
> If it bounces regularly it will still hurt.
>   

We could convert smp_call_function_mask to use a multi-vector scheme 
like tlb_64.c if that turns out to be an issue.

   J
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