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

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Message-ID: <20111002134802.GH7761@one.firstfloor.org>
Date:	Sun, 2 Oct 2011 15:48:02 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Don Zickus <dzickus@...hat.com>,
	Robert Richter <robert.richter@....com>,
	"x86@...nel.org" <x86@...nel.org>,
	Andi Kleen <andi@...stfloor.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

> 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.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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