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Date: Mon, 15 Nov 2010 08:04:23 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
Subject: Re: [PATCH] set_pgdat_percpu_threshold() don't use
 for_each_online_cpu
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References: <1288169256-7174-2-git-send-email-mel@csn.ul.ie> <20101028100920.5d4ce413.kamezawa.hiroyu@jp.fujitsu.com> <20101114163727.BEE0.A69D9226@jp.fujitsu.com> <20101115102617.GK27362@csn.ul.ie>
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To: Mel Gorman <mel@csn.ul.ie>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Andrew Morton <akpm@linux-foundation.org>, Shaohua Li <shaohua.li@intel.com>, David Rientjes <rientjes@google.com>, LKML <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>, Tejun Heo <tj@kernel.org>
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On Mon, 15 Nov 2010, Mel Gorman wrote:

> With recent per-cpu allocator changes, are we guaranteed that the per-cpu
> structures exist and are valid?

We always guarantee that all per cpu areas for all possible cpus exist.
That has always been the case. There was a discussion about changing
that though. Could be difficult given the need for additional locking.


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