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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>
In-Reply-To: <1316940890-24138-5-git-send-email-gilad@benyossef.com>
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	 <1316940890-24138-5-git-send-email-gilad@benyossef.com>
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Date: Mon, 26 Sep 2011 09:52:04 +0800
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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>, Frederic Weisbecker <fweisbec@gmail.com>, Russell King <linux@arm.linux.org.uk>, Chris Metcalf <cmetcalf@tilera.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Christoph Lameter <cl@linux-foundation.org>, Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>

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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