Re: [PATCH 2/2] x86: implement multiple queues for smp function call IPIs

[Jeremy Fitzhardinge <jeremy@goop.org>]

Jeremy Fitzhardinge wrote:
> This adds 8 queues for smp_call_function(), in order to avoid a
> bottleneck on a single global lock and list for function calls.  When
> initiating a function call, the sender chooses a queue based on its
> own processor id (if there are more than 8 processors, they hash down
> to 8 queues).  It then sends an IPI to the corresponding vector for
> that queue to each target CPU.  The target CPUs use the vector number
> to determine which queue they should scan for work.

I should point out that this patch depends on the earlier tlb.c 
unification patch, since it recycles the IPI vectors that series freed up.

    J