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    SubjectRe: [PATCH 4/5] mm: Only IPI CPUs to drain local pages if they exist
    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.

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