linux-kernel - Re: [PATCH 4/5] mm: Only IPI CPUs to drain local pages if they exist

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Message-ID: <1317001924.29510.160.camel@sli10-conroe>
Date:	Mon, 26 Sep 2011 09:52:04 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Gilad Ben-Yossef <gilad@...yossef.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Chris Metcalf <cmetcalf@...era.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [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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