linux-kernel - Re: [PATCH 1/3] readahead: drop behind

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Date:	Sat, 21 Jul 2007 16:29:07 -0400
From:	Eric St-Laurent <ericstl34@...patico.ca>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>, riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tim Pepper <lnxninja@...ibm.com>,
	Chris Snook <csnook@...hat.com>
Subject: Re: [PATCH 1/3] readahead: drop behind

On Sat, 2007-21-07 at 23:00 +0200, Peter Zijlstra wrote:
> plain text document attachment (readahead-useonce.patch)
> Use the read-ahead code to provide hints to page reclaim.
> 
> This patch has the potential to solve the streaming-IO trashes my
> desktop problem.
> 
> It tries to aggressively reclaim pages that were loaded in a strong
> sequential pattern and have been consumed. Thereby limiting the damage
> to the current resident set.
> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

With the fadvise change, it looks like the right solution to me.

The patches are for which kernel? They doesn't apply cleanly to
2.6.22.1.

It would be useful to have a temporary /proc tunable to enable/disable
the heuristic to help test the effects.


- Eric


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