linux-kernel - Re: [RFT][PATCH] mm: drop behind

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Date:	Fri, 13 Jul 2007 10:12:09 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Chris Snook <csnook@...hat.com>
Cc:	Tim Pepper <lnxninja@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>, riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [RFT][PATCH] mm: drop behind

On Thu, 2007-07-12 at 15:20 -0400, Chris Snook wrote:

> Then do what we do for FADV_SEQUENTIAL.  With that advice, we double the 
> readahead window.  We're already doing readahead, but we do a lot more 
> when we have the advice.  NOREUSE should put much greater pressure on 
> the vm to drop these pages quickly, or perhaps simply eliminate the 
> heuristic evaluation of the access pattern and short-circuit straight to 
> dropping the pages.
> 
> We should be encouraging application writers to actually use things like 
> fadvise when they can tune things more intelligently than kernel 
> heuristics can.

I like this, I'll see what I can do.. :-)

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