Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single()

[Jeremy Fitzhardinge]

Jens Axboe wrote:
> On Fri, Mar 14 2008, Jeremy Fitzhardinge wrote:
>   
> > Jens Axboe wrote:
> >     
> > > rom: Nick Piggin <npiggin@xxxxxxx>
> > >  
> > >       
> > Why is this necessary?  How is smp_call_function_single slow?
> >     
>
> Because it's completely serialized by the call_lock spinlock.
>   

Hm, yes.  Would it be possible to implement smp_call_function_mask in a 
generic way to avoid that?  Turn the static structure into a per-cpu 
request list?

   J
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