linux-kernel - Re: [patch 10/10] mm: workingset: keep shadow entries in check

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Message-ID: <20130603082209.GG5910@twins.programming.kicks-ass.net>
Date:	Mon, 3 Jun 2013 10:22:09 +0200
From:	Peter Zijlstra <peterz@...radead.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>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	metin d <metdos@...oo.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [patch 10/10] mm: workingset: keep shadow entries in check

On Thu, May 30, 2013 at 02:04:06PM -0400, Johannes Weiner wrote:
> 2. a list of files that contain shadow entries is maintained.  If the
>    global number of shadows exceeds a certain threshold, a shrinker is
>    activated that reclaims old entries from the mappings.  This is
>    heavy-handed but it should not be a common case and is only there
>    to protect from accidentally/maliciously induced OOM kills.

Grrr.. another global files list. We've been trying rather hard to get
rid of the first one :/

I see why you want it but ugh.

I have similar worries for your global time counter, large machines
might thrash on that one cacheline.

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