linux-kernel - Re: mmotm 2011-06-15-16-56 uploaded (mm/page

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Message-ID: <20110616165146.GB5244@suse.de>
Date:	Thu, 16 Jun 2011 17:51:46 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: mmotm 2011-06-15-16-56 uploaded (mm/page_cgroup.c)

On Thu, Jun 16, 2011 at 09:25:42AM -0700, Dave Hansen wrote:
> On Thu, 2011-06-16 at 11:35 +0100, Mel Gorman wrote:
> > > This patch removes definitions of node_start/end_pfn() in each archs
> > > and defines a unified one in linux/mmzone.h. It's not under
> > > CONFIG_NEED_MULTIPLE_NODES, now.
> > 
> > Does anyone remember *why* this did not happen in the first place? I
> > can't think of a good reason so I've cc'd Dave Hansen as he might
> > remember. 
> 
> You mean why it's not under CONFIG_NEED_MULTIPLE_NODES?  I'd guess it's
> just because it keeps working in all configurations since the
> pg_data_t->node_*_pfn entries are defined everywhere.
> 
> Is that what you're asking?
> 

No, why was node_start_pfn() and node_end_pfn() defined optionally
on a per-architecture basis?

-- 
Mel Gorman
SUSE Labs
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