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[Xen-devel] Re: [PATCH 3/7] libxenlight resend: 8mb physmap slack for pv

To: "Stefano Stabellini" <stefano.stabellini@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 3/7] libxenlight resend: 8mb physmap slack for pv domains
From: andres@xxxxxxxxxxxxxxxx
Date: Thu, 3 Dec 2009 07:55:38 -0800
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Vincent Hanquez <vincent.hanquez@xxxxxxxxxxxxx>
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I can cut the patch that way, however ... a fixed 8mb slack for pv domains
has been in place at least since Dec 08 2006, changeset 12803. No one
seems to have needed an optionally larger or smaller slack ;)
> On Wed, 2 Dec 2009, Andres Lagar-Cavilla wrote:
>> Contemplate 8MB of slack for PV domains, since they
>> do ballooning (or flipping network rx) and need
>> some extra room in their pfn space.
>> Note that this does not allocate any extra memory
>> to the domain, it simply extends the physmap with
>> some extra room for "bounce bufffering back" pfn's
>> that are yielded to dom0.
> Vincent is probably traveling and for this reason he didn't reply to
> your last email about this patch.
> I don't think he would be happy until you move the 8mb slack into a
> configurable parameter in libxl_domain_build_info, defaulted to 8mb in
> init_build_info.

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