linux-kernel - Re: fadvise DONTNEED implementation (or lack thereof)

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Message-Id: <20101115180153.BF18.A69D9226@jp.fujitsu.com>
Date:	Mon, 15 Nov 2010 18:10:49 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Minchan Kim <minchan.kim@...il.com>,
	Ben Gamari <bgamari.foss@...il.com>,
	linux-kernel@...r.kernel.org, rsync@...ts.samba.org,
	linux-mm@...ck.org, Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: fadvise DONTNEED implementation (or lack thereof)

> > I wonder what's the problem in Peter's patch 'drop behind'.
> > http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg179576.html
> > 
> > Could anyone tell me why it can't accept upstream?
> 
> Read the thread, its quite clear nobody got convinced it was a good idea
> and wanted to fix the use-once policy, then Rik rewrote all of
> page-reclaim.

If my understand is correct, rsync touch data twice (for a hash calculation
and for a copy). then, currect used-once-heuristics seems still doesn't work.





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