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