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

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Message-ID: <47DDA624.8000307@goop.org>
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
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