linux-kernel - Re: [patch 0/5] refault distance-based file cache sizing

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Message-Id: <20120501120819.0af1e54b.akpm@linux-foundation.org>
Date:	Tue, 1 May 2012 12:08:19 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	linux-mm@...ck.org, Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 0/5] refault distance-based file cache sizing

On Tue,  1 May 2012 10:41:48 +0200
Johannes Weiner <hannes@...xchg.org> wrote:

> This series stores file cache eviction information in the vacated page
> cache radix tree slots and uses it on refault to see if the pages
> currently on the active list need to have their status challenged.

So we no longer free the radix-tree node when everything under it has
been reclaimed?  One could create workloads which would result in a
tremendous amount of memory used by radix_tree_node_cachep objects.

So I assume these things get thrown away at some point.  Some
discussion about the life-cycle here would be useful.

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