linux-kernel - Re: [PATCH] emulate accessed bit for EPT

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Message-ID: <20100207192101.GB3387@amt.cnet>
Date:	Sun, 7 Feb 2010 17:21:01 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Rik van Riel <riel@...hat.com>, balbir@...ux.vnet.ibm.com,
	jdike@...toit.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, avi@...hat.com
Subject: Re: [PATCH] emulate accessed bit for EPT

On Fri, Feb 05, 2010 at 07:14:13PM +0100, Andrea Arcangeli wrote:
> On Fri, Feb 05, 2010 at 03:34:23PM -0200, Marcelo Tosatti wrote:
> > But perhaps a module parameter to turn accessed bit emulation off might
> > be handy in the future?
> 
> Maybe, but somebody should show that this can overall become a
> downside, which I doubt... I think if it does, the VM is to blame for
> calling page_referenced when there is no point to do so just yet.

Agreed. ACK.

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