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Date: Mon, 17 Mar 2008 08:25:14 +0100 From: Jens Axboe <jens.axboe@...cle.com> To: Jeremy Fitzhardinge <jeremy@...p.org> Cc: linux-kernel@...r.kernel.org, npiggin@...e.de, dgc@....com Subject: Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single() 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@...e.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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