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

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Date:	Tue, 01 May 2012 17:19:16 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	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 05/01/2012 03:08 PM, Andrew Morton wrote:
> 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.

I assume that in the current codebase Johannes has, we would
have to rely on the inode cache shrinker to reclaim the inode
and throw out the radix tree nodes.

Having a better way to deal with radix tree nodes that contain
stale entries (where the evicted pages would no longer receive
special treatment on re-fault, because it has been so long) get
reclaimed would be nice for a future version.

Probably not too urgent, though...

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