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Date: Sun, 16 Mar 2008 15:58:44 -0700 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Jens Axboe <jens.axboe@...cle.com> 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() 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? J -- 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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