linux-kernel - Re: [rfc][patch] x86-64 new smp_call

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Message-ID: <47DD2FC1.8040106@qumranet.com>
Date:	Sun, 16 Mar 2008 16:33:37 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Andi Kleen <ak@...e.de>
CC:	Nick Piggin <npiggin@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org
Subject: Re: [rfc][patch] x86-64 new smp_call_function design

Andi Kleen wrote:
>
>>>> As far as I understand, calling a subset of online CPUs that is not all or
>>>> one, is used quite infrequently, so this might be OK.
>>>>         
>>> With cpusets and isolation etc. it is the normal case.
>>>       
>> Oh really? Coming from what callers?
>>     
>
> The isolation work is not merged yet, but it will essentially need
> to turn a lot of the _call_function()s into _call_function_mask()
>   

kvm is also a heavy user of smp_call_function_mask(); if you run 
multiple smp guests you'll see plenty of disjoint smp_call_function_mask()s.

-- 
error compiling committee.c: too many arguments to function

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