linux-kernel - Re: [PATCH] KVM: VMX: add tracepoint for vpids

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Message-id: <1331551781.1334.3.camel@offworld>
Date:	Mon, 12 Mar 2012 12:29:41 +0100
From:	Davidlohr Bueso <dave@....org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH] KVM: VMX: add tracepoint for vpids

On Mon, 2012-03-12 at 10:22 +0200, Avi Kivity wrote:
> On 03/11/2012 05:57 PM, Davidlohr Bueso wrote:
> > From: Davidlohr Bueso <dave@....org>
> >
> > Add a new tracepoint for vpid allocation and freeing associated to all vCPUs.
> >
> 
> Why?
> 

We have been using this tracepoint for some time now to help debug vpids
and simulating tagged TLB behavior and performance. This gets to be non
trivial when working with large amounts of guests and vCPUs.

Thanks,
Davidlohr

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