Date: Mon, 15 Nov 2010 08:04:23 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
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>
Subject: Re: [PATCH] set_pgdat_percpu_threshold() don't use
 for_each_online_cpu
In-Reply-To: <20101115102617.GK27362@csn.ul.ie>
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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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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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