From: Keir Fraser <keir.xen@gmail.com>
To: Mohammad Hedayati <hedayati.mo@gmail.com>, xen-devel@lists.xensource.com
Subject: Re: Allowing several mappings of a frame
Date: Thu, 27 Oct 2011 22:55:08 +0100 [thread overview]
Message-ID: <CACF91CC.23D70%keir.xen@gmail.com> (raw)
In-Reply-To: <CABA5EEvdQoM+Hc1PJBzYbwbw3aBOUDhWQAEFDMTukznsFs9zZw@mail.gmail.com>
On 27/10/2011 22:16, "Mohammad Hedayati" <hedayati.mo@gmail.com> wrote:
> Xen currently allows granting a single frame to several domains,
> several times (to map or copy). Though the feature itself seems
> appealing, I wonder if there's a real use case in any ports or PV
> aware applications (i.e. a page is mapped or copied by more than 2
> domains). Is there?
It wouldn't typically happen.
> Except the condition outlined above, PGC_count_mask part of a
> page->count_info can be more than 1?
Yes. Go trace some count_info values in a running system. Most will be >1.
-- Keir
> Thanks,
> Mohammad
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
next prev parent reply other threads:[~2011-10-27 21:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-27 21:16 Allowing several mappings of a frame Mohammad Hedayati
2011-10-27 21:55 ` Keir Fraser [this message]
2011-10-28 8:57 ` Mohammad Hedayati
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