linux-kernel - Re: [PATCH 18/22] Use allocation flags as an index to the zone watermark

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Date:	Thu, 23 Apr 2009 09:27:15 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	kosaki.motohiro@...fujitsu.com, Mel Gorman <mel@....ul.ie>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 18/22] Use allocation flags as an index to the zone watermark

> On Wed, 2009-04-22 at 18:14 +0100, Mel Gorman wrote:
> > Preference of taste really. When I started a conversion to accessors, it
> > changed something recognised to something new that looked uglier to me.
> > Only one place cares about the union enough to access is via an array so
> > why spread it everywhere.
> 
> Personally, I'd say for consistency.  Someone looking at both forms
> wouldn't necessarily know that they refer to the same variables unless
> they know about the union.

for just clalification...

AFAIK, C language specification don't gurantee point same value.
compiler can insert pad between struct-member and member, but not insert
into array.

However, all gcc version don't do that. I think. but perhaps I missed
some minor gcc release..


So, I also like Dave's idea. but it only personal feeling.



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