Re: [Xen-devel] [PATCH] RFC: initial libxl support for xenpaging

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Mon, Feb 20, 2012 at 11:12 AM, Olaf Hering <olaf@xxxxxxxxx> wrote:
> On Mon, Feb 20, George Dunlap wrote:
>
>> Start-of-day:
>>  xenpaging off: Set balloon target to M, use PoD
>>  xenpaging on: ??
>>  xenpaging delay: Set balloon target to M, use PoD.  Wait
>> $pagingdelayboot seconds, if target not reached, set paging?
>
> Is the delay required?
> If paging and PoD target is M, xenpaging will do nothing because the
> guest can not exceed M (it will crash with OOM).

Ah, of course -- you don't need paging because it already has M
memory.  Forgot about that.

It would be nice, of course, if the pager could act as a back-fill for
these PoD pages; but that's another project, I think.

So that leaves us with:

maxmem=X
memory=M
xenpaging=[off|on|delay]
pagingdelay=60

xl mem-set domain M
 xenpaging off: Set balloon target to M
 xenpaging on: Set paging target to M
 xenpaging delay: Set balloon target to M, and wait for actual memory
to reach M.  If it hasn't reached it by $paging_delay seconds, set
balloon target to M.

xl mem-balloon-set domain M
 Set balloon target to M
xl mem-paging-set domain M
 Set paging target to M

Start-of-day:
 xenpaging off/delay: Set balloon target to M, use PoD
 xenpaging on: ??

Olaf, what do you do right now for booting a guest in paging mode with
memory < maxmem?

 -George

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