Messages in this thread | | | Date | Mon, 17 Mar 2008 08:25:14 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single() |
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On Sun, Mar 16 2008, Jeremy Fitzhardinge wrote: > 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?
Have you looked at the patches you are replying to? :-)
-- Jens Axboe
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