Xen devel - Jul 2013 - how to use void free_xenheap_pages(void *v, unsigned int order) ? what does the order mean?

hi, all
    I used alloc_xenheap_page()  to allocate  a page of  memory,  then I
should  free it.
but  I donnt know   what  the order  mean? can anyone give me an example?

comm->shared_page_ptr = alloc_xenheap_page();
comm->shared_page_mfn = virt_to_mfn(comm->shared_page_ptr);
page = mfn_to_page(comm->shared_page_mfn);
share_xen_page_with_privileged_guests(page, XENSHARE_writable);


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Best Regards,
yandong


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>>> On 05.07.13 at 03:55, yandong han <toyandong@gmail.com>
wrote:
>     I used alloc_xenheap_page()  to allocate  a page of  memory,  then I
> should  free it.
> but  I donnt know   what  the order  mean? can anyone give me an example?
Before asking here, why don''t you do a little bit of research yourself?
You obviously didn''t look at the "declaration" of
alloc_xenheap_page(),
or else you would have seen that this is a macro _and_ that there is
also a matching free_xenheap_page(). Either of the two observations
directly answers your question.

And along the same lines (considering the usage example you gave),
I can only recommend looking at how other existing code does this
handling, in order for you to avoid making mistakes here.

Jan