linux-kernel - Re: [PATCH kernel 1/2] mm: add the related functions to build the free page bitmap

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Message-ID: <1461077659.3200.8.camel@redhat.com>
Date:	Tue, 19 Apr 2016 10:54:19 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Liang Li <liang.z.li@...el.com>, mst@...hat.com,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	quintela@...hat.com, amit.shah@...hat.com, pbonzini@...hat.com,
	dgilbert@...hat.com
Cc:	linux-mm@...ck.org, kvm@...r.kernel.org, qemu-devel@...gnu.org,
	agraf@...e.de, borntraeger@...ibm.com
Subject: Re: [PATCH kernel 1/2] mm: add the related functions to build the
 free page bitmap

On Tue, 2016-04-19 at 22:34 +0800, Liang Li wrote:
> The free page bitmap will be sent to QEMU through virtio interface
> and used for live migration optimization.
> Drop the cache before building the free page bitmap can get more
> free pages. Whether dropping the cache is decided by user.
> 

How do you prevent the guest from using those
recently-freed pages for something else, between
when you build the bitmap and the live migration
completes?