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

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Date:	Sat, 02 May 2009 10:21:34 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"lee.schermerhorn@...com" <lee.schermerhorn@...com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [RFC][PATCH] vmscan: don't export nr_saved_scan in /proc/zoneinfo

Wu Fengguang 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?
> 
> CC: Christoph Lameter <cl@...ux-foundation.org>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>

Acked-by: Rik van Riel <riel@...hat.com>

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