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Date: Fri, 9 Aug 2013 15:49:43 -0700
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [patch 8/9] mm: thrash detection-based file cache sizing
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To: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-mm@kvack.org, Andi Kleen <andi@firstfloor.org>, Andrea Arcangeli <aarcange@redhat.com>, Greg Thelen <gthelen@google.com>, Christoph Hellwig <hch@infradead.org>, Hugh Dickins <hughd@google.com>, Jan Kara <jack@suse.cz>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Mel Gorman <mgorman@suse.de>, Minchan Kim <minchan.kim@gmail.com>, Peter Zijlstra <peterz@infradead.org>, Rik van Riel <riel@redhat.com>, Michel Lespinasse <walken@google.com>, Seth Jennings <sjenning@linux.vnet.ibm.com>, Roman Gushchin <klamm@yandex-team.ru>, Ozgun Erdogan <ozgun@citusdata.com>, Metin Doslu <metin@citusdata.com>, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org

On Tue,  6 Aug 2013 18:44:09 -0400 Johannes Weiner <hannes@cmpxchg.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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