linux-kernel - Re: [V6][PATCH 4/6] x86, nmi: add in logic to handle multiple events and unknown NMIs

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Date:	Sun, 02 Oct 2011 16:04:39 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Don Zickus <dzickus@...hat.com>,
	Robert Richter <robert.richter@....com>,
	"x86@...nel.org" <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"ying.huang@...el.com" <ying.huang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	"jeremy@...p.org" <jeremy@...p.org>
Subject: Re: [V6][PATCH 4/6] x86, nmi:  add in logic to handle multiple events
 and unknown NMIs

On 10/02/2011 03:48 PM, Andi Kleen wrote:
> >  Second, I wanted to use NMIs as a way of waking up a vcpu sleeping with
> >  interrupts disabled (in the context of Jeremy's paravirt spinlock
> >  patches).  Looks like we'll have to use paravirtualization for that.
>
> Just use a mode of perf that doesn't use NMIs.
> Interrupt off profiling is rarely needed if at all on modern kernels.

I tend to agree.   But that's not my call.

(note 'perf kvm' will need adjustment if we make that change - likely 
need to capture the interrupt during vmexit and dispatch it manually; 
not sure if it's workable for svm at all)

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

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