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Re: [Xen-devel] Xen-unstable panic: FATAL PAGE FAULT

To: "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Xen-unstable panic: FATAL PAGE FAULT
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Tue, 31 Aug 2010 16:07:23 +0100
Cc: MaoXiaoyun <tinnycloud@xxxxxxxxxxx>, xen devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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>>> On 31.08.10 at 16:49, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> I'm cc'ing Jan to see what we can get away with in doing arithmetic on
> page_info pointers. What's the guaranteed smallest aligned contiguous ranges
> of mfn in the frame_table now, Jan? (i.e., ranges in which adjacent
> page_info structs relate to adjacent MFNs)

Any range of struct page_info-s that crosses a 2Mb boundary is
unsafe to make assumptions upon (with 32-byte struct page_info
that means 256Mb of memory, but if struct page_info grows that
range might shrink). If that limit is too low, we might need to
enforce a lower limit on the bit positions on which compression
may be done (possibly at the price of doing less compression).


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