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SubjectRe: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single()
Jens Axboe wrote:
> On Fri, Mar 14 2008, Jeremy Fitzhardinge wrote:
>
>> Jens Axboe wrote:
>>
>>> rom: Nick Piggin <npiggin@suse.de>
>>>
>>>
>> 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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