Re: [Xen-devel] questions about ballooning

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 4/11/07 17:04, "Daniel Stodden" <stodden@xxxxxxxxxx> wrote:

> not sure about how this bootstraps in the balloon. e.g. i'm not sure
> whether the whole initial memory is allocated and then returned again
> only upon demand. or if the initial reservation is full memory and then
> only grown by the balloon. i believe the former is the case. maybe
> someone else can comment (please).

The arch-specific code (setup-xen.c) sets up a mem_map big enough for
maximum memory ever allocatable to this domain. 'Empty pages', which are not
populated with RAM by the initial reservation, are detected by the balloon
driver when it initialises. These empty pages are filled with RAM by the
balloon driver on demand, if it detects that the memory target is raised.

 -- Keir




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