linux-kernel - Re: [RFC][PATCH] vmscan: don't export nr_saved

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Date:	Tue, 05 May 2009 09:38:10 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	torvalds@...ux-foundation.org, kosaki.motohiro@...fujitsu.com,
	lee.schermerhorn@...com, riel@...hat.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, npiggin@...e.de,
	cl@...ux-foundation.org
Subject: Re: [RFC][PATCH] vmscan: don't export nr_saved_scan in
 /proc/zoneinfo

On Mon, 2009-05-04 at 14:49 -0700, Andrew Morton wrote:
> On Sat, 2 May 2009 10:47:19 +0800
> Wu Fengguang <fengguang.wu@...el.com> wrote:
> 
> > The lru->nr_saved_scan's are not meaningful counters for even kernel
> > developers.  They typically are smaller than 32 and are always 0 for
> > large lists. So remove them from /proc/zoneinfo.
> > 
> > Hopefully this interface change won't break too many scripts.
> > /proc/zoneinfo is too unstructured to be script friendly, and I wonder
> > the affected scripts - if there are any - are still bleeding since the
> > not long ago commit "vmscan: split LRU lists into anon & file sets",
> > which also touched the "scanned" line :)
> > 
> > If we are to re-export accumulated vmscan counts in the future, they
> > can go to new lines in /proc/zoneinfo instead of the current form, or
> > to /sys/devices/system/node/node0/meminfo?
> > 
> 
> /proc/zoneinfo is unsalvageable :( Shifting future work over to
> /sys/devices/system/node/nodeN/meminfo and deprecating /proc/zoneinfo
> sounds good to me.

If only one could find things put in sysfs :-)
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