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

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Message-Id: <20120418224251.d832fc4728e6f2114f59a3b1@gmail.com>
Date:	Wed, 18 Apr 2012 22:42:51 +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 17:56:24 +0300
Avi Kivity <avi@...hat.com> wrote:

> > For live migration, range-based control may be enough duo to the locality
> > of WWS.
> 
> What's WWS?

IIRC it was mentioned in a usenix paper: Writable Working Set.

May not be a commonly known concept.
Kind of working set, but is written often.

> I don't see a reason to assume locality in gpa space (or in gva space
> either, for some workloads).

Sorry, I may be wrong.

I once thought to log dirty_bitmaps during live migration, but didn't.

Thanks,
	Takuya
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