linux-kernel - Re: [patch 8/9] mm: thrash detection-based file cache sizing

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Message-Id: <20130809154943.1663e5f04999e1979886246c@linux-foundation.org>
Date:	Fri, 9 Aug 2013 15:49:43 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	linux-mm@...ck.org, Andi Kleen <andi@...stfloor.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Greg Thelen <gthelen@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Ozgun Erdogan <ozgun@...usdata.com>,
	Metin Doslu <metin@...usdata.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 8/9] mm: thrash detection-based file cache sizing

On Tue,  6 Aug 2013 18:44:09 -0400 Johannes Weiner <hannes@...xchg.org> wrote:

> To accomplish this, a per-zone counter is increased every time a page
> is evicted and a snapshot of that counter is stored as shadow entry in
> the page's now empty page cache radix tree slot.

How do you handle wraparound of that counter on 32-bit machines?
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