Re: [Xen-devel] [PATCH 05 of 23] libxl: drop 8M slack for PV guests

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Ian Campbell writes ("[Xen-devel] [PATCH 05 of 23] libxl: drop 8M slack for PV 
guests"):
> libxl: drop 8M slack for PV guests.
> 
> As far as I can tell this serves no purpose. I think it relates to the old
> 8M to "account for backend allocations" which we used to add. This leaves a 
> bit
> of unpopulated space in the Pseudo-physical address space which can be used by
> backends when mapping foreign memory. However 8M is not representative of that
> any more and modern kernels do not operate in this way anyway.
> 
> I suspect an argument could be made for removing this from the libxl API
> altogether but instead lets just set the overhead to 0.

I think this is plausible but I'd like to hear from Stefano, who iirc
may have some knowledge about the reason for this 8Mb.

Ian.

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