linux-kernel - Re: [PATCH] vmscan: evict use-once pages first (v3)

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Message-ID: <20090503014655.GA6794@localhost>
Date:	Sun, 3 May 2009 09:46:55 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Elladan <elladan@...imo.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] vmscan: evict use-once pages first (v3)

On Sun, May 03, 2009 at 09:33:56AM +0800, Rik van Riel wrote:
> On Sun, 3 May 2009 09:15:40 +0800
> Wu Fengguang <fengguang.wu@...el.com> wrote:
> 
> > In the worse scenario, it could waste half the memory that could
> > otherwise be used for readahead buffer and to prevent thrashing, in a
> > server serving large datasets that are hardly reused, but still slowly
> > builds up its active list during the long uptime (think about a slowly
> > performance downgrade that can be fixed by a crude dropcache action).
> 
> In the best case, the active list ends up containing all the
> indirect blocks for the files that are occasionally reused,
> and the system ends up being able to serve its clients with
> less disk IO.
> 
> For systems like ftp.kernel.org, the files that are most
> popular will end up on the active list, without being kicked
> out by the files that are less popular.

Sure, such good cases tend to be prevalent - so obvious that I didn't
mind to mention ;-)
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