From: Mick Jordan <Mick.Jordan@sun.com>
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: xen-devel-list <xen-devel@lists.xensource.com>
Subject: Re: memory_reservation bug?: memory holes
Date: Wed, 11 Mar 2009 12:50:33 -0700 [thread overview]
Message-ID: <49B81609.8070305@Sun.COM> (raw)
In-Reply-To: <C5DDAE97.4D02%keir.fraser@eu.citrix.com>
On 03/11/09 11:08, Keir Fraser wrote:
>
> Just because you called decrease_reservation() doesn't mean the pages
> necessarily really got freed. If you still have mappings to them squirrelled
> away then the free can be deferred.
>
A related question. I assume it is ok to have holes in the physical
memory, i.e. call decrease_reservation with a range << max_pfn. In this
case, what are the rules for the value in the P2M table? Does Xen zero
out the slot or is it the guest's responsibility? save/restore must be
able to determine that a hole exists.
Mick
next prev parent reply other threads:[~2009-03-11 19:50 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-11 17:32 memory_reservation bug? Mick Jordan
2009-03-11 18:08 ` Keir Fraser
2009-03-11 19:34 ` Mick Jordan
2009-03-11 19:50 ` Mick Jordan [this message]
2009-03-11 22:41 ` memory_reservation bug?: memory holes Keir Fraser
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