linux-kernel - Re: [PATCH 10/10] mm: per device dirty threshold

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Message-ID: <Pine.LNX.4.64.0704230847400.10624@schroedinger.engr.sgi.com>
Date:	Mon, 23 Apr 2007 08:48:23 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, miklos@...redi.hu, neilb@...e.de,
	dgc@....com, tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com
Subject: Re: [PATCH 10/10] mm: per device dirty threshold

On Sat, 21 Apr 2007, Peter Zijlstra wrote:

> > > This is enormously wrong for CONFIG_NR_CPUS=1024 on a 2-way.
> 
> Right, I knew about that but, uhm.
> 
> I wanted to make that num_online_cpus(), and install a hotplug notifier
> to fold the percpu delta back into the total on cpu offline.

Use nr_cpu_ids instead. Contains the maximum possible cpus on this 
hardware and allows to handle the hotplug case easily.

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