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Subject: Re: [PATCH 4/5] mm: Only IPI CPUs to drain local pages if they
 exist
From: Shaohua Li <shaohua.li@intel.com>
To: Gilad Ben-Yossef <gilad@benyossef.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
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        Christoph Lameter <cl@linux-foundation.org>,
        Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>
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Date: Mon, 26 Sep 2011 09:52:04 +0800
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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.