linux-kernel - Re: [PATCH] Enhance perf to collect KVM guest os statistics from host side

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Message-ID: <4BA0A9B8.1030802@redhat.com>
Date:	Wed, 17 Mar 2010 12:06:48 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Sheng Yang <sheng@...ux.intel.com>
CC:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>,
	"Huang, Zhiteng" <zhiteng.huang@...el.com>,
	Joerg Roedel <joerg.roedel@....com>
Subject: Re: [PATCH] Enhance perf to collect KVM guest os statistics from
 host side

On 03/17/2010 11:51 AM, Sheng Yang wrote:
>
>> I think you need DM_NMI for that to work correctly.
>>
>> An alternative is to call the NMI handler directly.
>>      
> apic_send_IPI_self() already took care of APIC_DM_NMI.
>    

So it does (though not for x2apic?).  I don't see why it doesn't work.

> And NMI handler would block the following NMI?
>
>    

It wouldn't - won't work without extensive changes.

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

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