linux-kernel - Re: [patch 9/9] mm: workingset: keep shadow entries in check

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Message-ID: <20130811235631.GO19750@two.firstfloor.org>
Date:	Mon, 12 Aug 2013 01:56:31 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	linux-mm@...ck.org, Andi Kleen <andi@...stfloor.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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 9/9] mm: workingset: keep shadow entries in check


I really like the idea of using the spare slots in the radix tree
for something useful. It's amazing we haven't used that before.

I wonder if with some clever encoding even more information could be fit?

e.g. I assume you don't really need all bits of the refault distance,
just a good enough approximation.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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