linux-kernel - Re: [PATCH] vmscan: evict use-once pages first (v2)

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Message-Id: <1241424277.7620.4491.camel@twins>
Date:	Mon, 04 May 2009 10:04:37 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, elladan@...imo.com,
	linux-kernel@...r.kernel.org, tytso@....edu,
	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org
Subject: Re: [PATCH] vmscan: evict use-once pages first (v2)

On Fri, 2009-05-01 at 12:35 -0700, Andrew Morton wrote:

> No, I think it still _is_ the case.  When reclaim is treating mapped
> and non-mapped pages equally, the end result sucks.  Applications get
> all laggy and humans get irritated.  It may be that the system was
> optimised from an overall throughput POV, but the result was
> *irritating*.
> 
> Which led us to prefer to retain mapped pages.  This had nothing at all
> to do with internal impementation details - it was a design objective
> based upon empirical observation of system behaviour.

Shouldn't we make a distinction between PROT_EXEC and other mappings in
this? Because as soon as you're running an application that uses gobs
and gobs of mmap'ed memory, the mapped vs non-mapped thing breaks down.
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