Dave Hansen wrote:Hm, actually this is precisely the wrong thing to do in this case. When the balloon driver adds a new section of hotplug memory, its doing it to get the page structures, but there's no actual memory backing those pages. The memory only comes into existence on a page-by-page basis when the balloon driver gets memory from the hypervisor and attaches it to each page (the balloon driver uses online_page() on each page as its ready). If the user does a mass online via /sys the system explodes because it onlines a large number of pages which have no backing memory. Since none of those pages can be mapped, the kernel explodes in a variety of interesting ways. So I'd really like to inhibit the sysfs interface on these sections. Thoughts? Thanks, J --
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