linux-kernel - Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function

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Message-ID: <20080316184506.GW17940@kernel.dk>
Date:	Sun, 16 Mar 2008 19:45:07 +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 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.

-- 
Jens Axboe

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