linux-kernel - Re: [PATCH v4 06/10] KVM: MMU: fast path of handling guest page fault

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Message-ID: <4FA6460C.8020702@redhat.com>
Date:	Sun, 06 May 2012 12:36:12 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v4 06/10] KVM: MMU: fast path of handling guest page fault

On 05/05/2012 05:08 PM, Marcelo Tosatti wrote:
> It would be better if all these complications introduced by lockless
> updates can be avoided, say using A/D bits as Avi suggested.

Note that using A/D bits introduces new tradeoffs (when just a few bits
are dirtied per iteration, we reduce guest overhead, but increase host
overhead, since it has to scan a large number of sptes), and also a
large fraction of deployed systems don't have A/D bits support.  But it
should affect our thinking - since in the long term all hosts will have it.

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

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