Re: [Xen-devel] [PATCH] x86: fix memory cut-off when using PFN compression

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.09.13 at 16:02, Dario Faggioli <dario.faggioli@xxxxxxxxxx> wrote:
> On mer, 2013-09-11 at 13:48 +0100, Jan Beulich wrote:
>> The only possibly problematic consumer of node_spanned_pages (the
>> meaning of which gets altered here in that it now also includes memory
>> Xen can't actively make use of) is XEN_SYSCTL_numainfo: At a first
>> glance the potentially larger reported memory size shouldn't confuse
>> tool stacks.
>> 
> It really shouldn't... Just one thing (if you happen to know that from
> the top of you head): would this "potentially larger" amount of pages
> being reported involve only what XEN_SYSCTL_numainfo reports as the
> node's size (which indeed uses node_spanned_pages() ), or would it also
> affect what it reports as the amount of free memory on the node (which
> uses avail_node_heap_pages() ) ?
> 
> I tried to find that out by myself and I'd say that is not the case
> (i.e., amount of free memory is not affected), as I did not fine any
> call to node_spanned_pages()... Did I miss anything?

No, this indeed is only about the node size, not a node's free
memory.

Jan


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