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

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Message-ID: <alpine.DEB.2.00.1206110937430.31180@router.home>
Date:	Mon, 11 Jun 2012 09:40:47 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	kosaki.motohiro@...il.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] mm: fix protection column misplacing in /proc/zoneinfo

On Mon, 11 Jun 2012, KOSAKI Motohiro wrote:

> 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.

The vmevent countes are something different from the zone counters. Event
counters are indeed statistics only but the numbers here were intended
to be are actual counts of pages. Well some of them like the numa_XXX are
stats you are right. Those could be moved off the ZVCs and become event
counters.

> > 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.

Cray? What does that have to do with it.

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

Yes that would be a good thing.
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