On Sun, 2011-09-25 at 16:54 +0800, Gilad Ben-Yossef wrote:
> Use a cpumask to track CPUs with per-cpu pages in any zone
> and only send an IPI requesting CPUs to drain these pages
> to the buddy allocator if they actually have pages.
Did you have evaluation why the fine-grained ipi is required? I suppose
every CPU has local pages here.