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

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Message-ID: <F2CBF3009FA73547804AE4C663CAB28E04182594@shsmsx102.ccr.corp.intel.com>
Date:	Tue, 19 Apr 2016 15:02:09 +0000
From:	"Li, Liang Z" <liang.z.li@...el.com>
To:	Rik van Riel <riel@...hat.com>, "mst@...hat.com" <mst@...hat.com>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"quintela@...hat.com" <quintela@...hat.com>,
	"amit.shah@...hat.com" <amit.shah@...hat.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	"dgilbert@...hat.com" <dgilbert@...hat.com>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
	"agraf@...e.de" <agraf@...e.de>,
	"borntraeger@...ibm.com" <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?

Because the dirty page logging is enabled before building the bitmap, there is no need
to prevent the guest from using the recently-freed pages ...

Liang