linux-kernel - Re: [PATCH 00/13] KVM: MMU: fast page fault

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Message-Id: <20120417235450.c0972c06034002d7173eeb40@gmail.com>
Date:	Tue, 17 Apr 2012 23:54:50 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	kvm-ppc@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com>,
	Xiao Guangrong <xiaoguangrong.eric@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 00/13] KVM: MMU: fast page fault

On Tue, 17 Apr 2012 15:41:39 +0300
Avi Kivity <avi@...hat.com> wrote:

> > Since there are many known algorithms to predict hot memory pages,
> > the userspace will be able to tune the frequency of GET_DIRTY_LOG for such
> > parts not to get too many faults repeatedly, if we can restrict the range
> > of pages to protect.
> >
> > This is the fine-grained control.
> 
> Do you want per-page control, or just range-based?

Difficult question.

For live migration, range-based control may be enough duo to the locality
of WWS.

Thanks,
	Takuya
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