From: Joanna Rutkowska <joanna@invisiblethingslab.com>
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Rafal Wojtczuk <rafal@invisiblethingslab.com>
Subject: Re: scrubbing pages on vm pause
Date: Tue, 25 May 2010 16:24:34 +0200 [thread overview]
Message-ID: <4BFBDDA2.6010609@invisiblethingslab.com> (raw)
In-Reply-To: <C8219B17.1542C%keir.fraser@eu.citrix.com>
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On 05/25/2010 04:19 PM, Keir Fraser wrote:
> On 25/05/2010 15:19, "Joanna Rutkowska" <joanna@invisiblethingslab.com>
> wrote:
>
>> Let's consider this scenario:
>>
>> xm save domain1
>>
>> xm create domain2
>>
>> Can the domain2 get *unscrubbed* pages that were previously used by
>> domain1, but were not scrubbed properly by domain1?
>
> Generally speaking a domain loses pages to the free pool in only two ways:
> via a decrease_reservation hypercall, and via domain destruction. In the
> former case the domain itself is responsible for first scrubbing the page.
> In the latter case Xen is responsible. With both avenues covered, domain2
> cannot get unscrubbed pages from domain1.
>
Makes sense.
Thanks,
j.
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next prev parent reply other threads:[~2010-05-25 14:24 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-25 10:35 Improving domU restore time Rafal Wojtczuk
2010-05-25 10:58 ` Joanna Rutkowska
2010-05-25 11:50 ` Keir Fraser
2010-05-25 12:50 ` Rafal Wojtczuk
2010-05-25 12:59 ` Keir Fraser
2010-05-25 13:33 ` scrubbing free'd pages James Harper
2010-05-25 13:39 ` Keir Fraser
2010-05-25 13:48 ` Paul Durrant
2010-05-25 14:12 ` scrubbing pages on vm pause Joanna Rutkowska
2010-05-25 14:13 ` Keir Fraser
2010-05-25 14:19 ` Joanna Rutkowska
2010-05-25 14:19 ` Keir Fraser
2010-05-25 14:24 ` Joanna Rutkowska [this message]
2010-05-25 13:02 ` Improving domU restore time Keir Fraser
2010-05-31 9:42 ` Rafal Wojtczuk
2010-06-01 17:00 ` Jeremy Fitzhardinge
2010-06-02 16:24 ` Rafal Wojtczuk
2010-06-02 16:33 ` Jeremy Fitzhardinge
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