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

[Andres Lagar-Cavilla <andres@lagarcavilla.com>]

No extra memory is being allocated at all in any way. The only impact is 
a wee bit larger p2m table.
Andres
Vincent Hanquez wrote:
> On Wed, Dec 02, 2009 at 06:00:31PM +0000, 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.
>>     
>
> but the memory is still going off from somewhere isn't it ?
> all those random memory constants spread around in xend took us quite some time
> to get things right in XCP and XenServer, and also for keeping the library as
> dumb as possible, I'ld rather have the toolstack set the field in the structure
> (even if it end up beeing 8M all the time) than starting adding those things.
>
>