linux-kernel - Re: [PATCH][KVM][retry 3] Add support for Pause Filtering to AMD SVM

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Date:	Wed, 20 May 2009 11:49:15 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Mark Langsdorf <mark.langsdorf@....com>,
	Joerg Roedel <joerg.roedel@....com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][KVM][retry 3] Add support for Pause Filtering to AMD
 SVM

Peter Zijlstra wrote:
>>> That said, I still thoroughly dislike this whole approach.
>>>   
>>>       
>> Can you explain why?  We have a thread that has detected that it's 
>> spinning.  Keeping on spinning is a waste of cpu time.  Why not let 
>> something else use the cpu?
>>     
>
> Because its a polling interface. I much prefer it if we were to get a
> wakeup notification when the vcpu holding the lock releases it.
>   

It's a fully virtualized guest.  There's no way to get this without 
patching the guest kernel.

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

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