linux-kernel - Re: [PATCH] mm: fix protection column misplacing in /proc/zoneinfo

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Date:	Mon, 11 Jun 2012 10:31:03 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	cl@...ux.com
CC:	kosaki.motohiro@...il.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, kosaki.motohiro@...fujitsu.com
Subject: Re: [PATCH] mm: fix protection column misplacing in /proc/zoneinfo

On 6/11/2012 10:02 AM, Christoph Lameter wrote:
> On Mon, 11 Jun 2012, kosaki.motohiro@...il.com wrote:
> 
>> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
>>
>> commit 2244b95a7b (zoned vm counters: basic ZVC (zoned vm counter)
>> implementation) broke protection column. It is a part of "pages"
>> attribute. but not it is showed after vmstats column.
>>
>> This patch restores the right position.
> 
> Well this reorders the output. vmstats are also counts of pages. I am not
> sure what the difference is.

No. In this case, "pages" mean zone attribute. In the other hand, vmevent
is a statistics.


> You are not worried about breaking something that may scan the zoneinfo
> output with this change? Its been this way for 6 years and its likely that
> tools expect the current layout.

I don't worry about this. Because of, /proc/zoneinfo is cray machine unfrinedly
format and afaik no application uses it.

btw, I believe we should aim /sys/devices/system/node/<node-num>/zones new directory
and export zone infos as machine readable format.
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